JPH03214593A - Full color el display panel - Google Patents

Abstract

PURPOSE:To enhance the reliability and harmonize the light emission efficiencies of three colors by forming small the light emission regions of EL light-emitting elements of red, green, and blue on their respective base boards while the shapes of their second electrodes are made smaller little by little from the one with lower light emission efficiency to the higher, and laminating them in sequence from the one with lower light emission efficiency. CONSTITUTION:EL light-emitting elements having a blue light emitting layer 24, red light emitting layer 34, and green light emitting layer 44 are formed on respective base boards 21, 31, 41 to make a first, second and third EL display panel. Electrode 36 is made smaller than a one 26 while an electrode 46 smaller than a one 36, and the light emission regions are formed smaller in the sequence from blue, red, and green, and the base boards on which the EL light-emitting elements are formed are laminated in sequence from blue, red, and green, to constitute a full color EL display panel. Because the EL light-emitting elements are separated by the base boards 31, 41, influence of cross-talk occurring between wirings will lessen. Thereby the reliability is enhanced, and harmony is obtained between the light emission efficiencies of three colors because the EL display panels for blue, red, green light emission are laminated in sequence nearer as named to the surface of the display panel.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a full-color EL display panel that obtains a full-color display by mixing red (R), green (G), and blue (B), and is particularly easy to manufacture. This invention relates to a highly reliable full-color EL display panel.

(Prior Art) Display devices have become indispensable as man-machine interfaces as the highly information-oriented society progresses, and there is a strong demand for lightweight, thin flat display devices to replace CRTs, and in particular, there is a strong demand for lightweight, thin flat display devices that can be used to display a variety of displays. At present, there is a strong desire to put into practical use a full-color EL display panel that is capable of displaying images.

A first example of a conventional full-color EL display panel is one in which light-emitting layers emitting red (R), green (G), and blue (B) are divided and arranged on the same substrate; As an example of the second example, there is a thin film laminated structure in which thin films of RGB light emitting layers are laminated on the same substrate to realize multicolor display, and as a third example, EL light emitting elements are laminated on two substrates. There was a structure in which they were formed and bonded in opposing directions.

The structure of the first example in which each light emitting layer for RGB light is divided and arranged on the same substrate will be described with reference to a cross-sectional view shown in FIG. A transparent electrode as a first electrode 2, a first insulating layer 3, a light emitting layer 4, and a second insulating layer 5 are formed on a substrate 1 made of glass or the like.
, a back electrode serving as the second electrode 6 is sequentially laminated to form an EL light emitting element. The light-emitting layer 4 is divided into blue, green, and red light-emitting layers. Specifically, a certain light emitting layer 4 is made of Zn in order to emit blue light.
A luminescent center such as TmF is added to a matrix of S, ZnSe, or a mixed crystal of ZnS and ZnSe. Further, in order to emit green light, another light-emitting layer 4 is doped with a light-emitting center such as TbF using ZnS, ZnSe, or a mixed crystal of ZnS and ZnSe as a matrix. Furthermore, another light emitting layer 4 contains ZnS or ZnS in order to emit red light.
e or a mixed crystal of ZnS and ZnSe as a matrix, Sm
A luminescent center such as F, etc. is added. Tm is blue, Tb
is green, and Sm is red. Ru. The first and second insulating layers 3 and 5 are made of Y,0,, S 5 N,
, Ta20, , BaTiO, or the like. The transparent electrode as the first electrode 2 is made of indium tin oxide (ITo), In20,
, SnO, etc., and the back electrode as the second electrode 6 is made of metal such as aluminum (AI). These insulating layers and light-emitting layers are formed by film-forming methods such as sputtering, vacuum evaporation, and CVD, and the total thickness of the EL light-emitting element is 2 microns or less.

In the full-color EL display panel of the above first example, by applying a high voltage between the first and second electrodes 2 and 6, thermionic electrons accelerated by an electric field collide and excite the luminescent center, resulting in electroluminescence. , for panel display.

The second example of a thin film laminated structure in which thin films of each light emitting layer for RGB light emission are laminated on the same substrate to realize a multicolor display will be described with reference to a cross-sectional view shown in FIG. A transparent electrode as a first electrode 2, a first insulating layer 3, a blue light emitting layer as a first light emitting layer 4, a second insulating layer 5, and a second electrode 6 are formed on a substrate 1 made of glass or the like. A transparent electrode as a third insulating layer 7, a green light emitting layer as a second light emitting layer 8, a fourth insulating layer 9, and a transparent electrode as a third electrode 10 are further laminated in order. Furthermore, a fifth insulating layer 11, a red light emitting layer as a third light emitting layer 12, and a sixth insulating layer 1
3. Sequentially stacking the back electrodes as the fourth electrode 14
It has a structure in which L light emitting elements are stacked. Here, the second electrode 6 serves as a common electrode for both the blue light emitting layer 4 and the green light emitting layer 8, and the third electrode 10 serves as a common electrode for both the green light emitting layer 8 and the red light emitting layer 8. It serves as a common electrode for both layers 12. Here, the first electrode 2,
The second electrode 6 and the third electrode 10 are made of ITO or the like, and the fourth electrode 14 is made of aluminum (AI). Materials for blue, green, and red light emitting layers and insulating layers 3 and 5
, 7, 9, 11, and 13 are the same as those described for the full-color EL display panel of the first example.

The second full-color EL display panel described above displays multiple colors by emitting light from each of the overlaid light emitting layers.

The third example of a structure in which EL light emitting elements are formed on two substrates and coupled to each other while facing each other will be described with reference to a cross-sectional view shown in FIG. 8. A transparent electrode as a first electrode 2a and a first insulating layer 3a are placed on a substrate la made of glass or the like.
s light emitting layer 4a, second insulating layer 5 a s second electrode 6
An EL light emitting element is formed by sequentially stacking a back electrode as a, and a transparent electrode as a first electrode 2b, a first insulating layer 3b, a light emitting layer 4b, and a second layer are placed on another substrate 1b such as glass. An EL light emitting element is formed by sequentially stacking an insulating layer 5b1 and a back electrode as a second electrode 6b, and as shown in FIG.
It has a structure in which two EL light emitting elements are coupled so that a and a substrate 1b are on the outside. In this case, the light emitting layer 4a
is composed of ZnS:SmF, which emits red light, the light-emitting layer 4b is composed of ZnS:TbF, which emits green light, and the transparent electrode and back electrode are composed of ITO, etc. (See Publication No. 263982).

In such a configuration, the panel displays information by emitting light from the light emitting layer 4a and the light emitting layer 4b. Also,
In order to display full color, if the structure of the third example is combined with the structure of the first example or the second example, RSG, B light emission becomes possible, and full color display is possible by color mixing. . In other words, the light-emitting layer of the EL light-emitting element on one of the substrates in the third example above is divided into two light-emitting layers that emit light in two colors, and the light-emitting layer of the EL light-emitting element on the other substrate remains as it is. A structure in which EL light emitting elements are pasted together, or a double structure in which the light emitting layer of the EL light emitting element is laminated on one substrate in the third example, and light emitting layers emitting different colors are stacked via an insulating layer and a transparent electrode. and E on the other substrate.
The light-emitting layer of the L-light-emitting element may be left as it is, and two EL-light-emitting elements may be laminated together.

(Invention or problem to be solved) However, the full color EL of the first example shown above
In the structure of a display panel, if an attempt is made to increase the density by reducing the size of the pixels of each EL light emitting element in order to improve performance, there is a problem in that the brightness of the pixels cannot be maintained sufficiently. Each EL divided and arranged on the same substrate 1
The wiring drawn out from the pixels of the light emitting element passes between each pixel, and in order to improve the performance of the panel, each EL
It is necessary to make the pixel part of the light emitting element relatively large and to make the wiring finer and higher density, which makes it difficult to manufacture, making it especially difficult to enlarge the panel, and when the panel is enlarged, As the wiring becomes finer, the wiring resistance becomes relatively large, which causes difficulties in driving, and furthermore, there is a problem that the connection part with the driving circuit becomes complicated.

In addition, in the structure of the full-color EL display panel of the second example above, especially when the light emitting layer and the insulating layer are thin, crosstalk may occur between the laminated electrodes.
When a voltage is applied to the electrode 2 but not to the second electrode 6, when a voltage is applied to the third electrode]O, the third electrode 10 and the second Crosstalk may occur between the electrodes 6 and the second electrode 6, and since the wiring drawn from each electrode is stacked on the substrate 1, the wiring capacitance increases between the drawn wirings. However, there was a problem in that crosstalk occurred between wirings as well as between electrodes.

Furthermore, in the configuration of the full-color EL display panel of the third example above, in order to display full colors in R, G, and B,
The problem is that the first example or the second example must be incorporated into the third example, which further complicates the manufacturing process.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a full-color EL display panel that is easy to manufacture and highly reliable.

(Means for Solving the Problems) In order to solve the problems of the conventional example described above, the present invention provides a first electrode, a first insulating layer, a colored light emitting layer, a second insulating layer, a first In a full-color EL display panel formed by stacking a plurality of EL display panels formed in the order of electrodes 2 and 3, the second EL display panel has a luminous efficiency higher than that of the luminescent layer in the first EL display panel. A third EL display panel is formed with a light-emitting layer, and a third EL display panel has a luminous efficiency higher than that of the luminescent layer in the second EL display panel.
forming a light emitting layer in the display panel; a second electrode in the second EL display panel is formed smaller than a second electrode in the first EL display panel;
The second electrode in the L display panel is formed smaller than the second electrode in the second EL display panel, and
The second EL display panel is provided on the EL display panel, and the third EL display panel is provided on the second EL display panel.

(Function) According to the present invention, an EL display panel is formed by forming EL elements having light-emitting layers emitting light in red, green, and blue colors on respective substrates, and in this case, the light-emitting efficiency of the light-emitting layer is By gradually reducing the shape of each second electrode in the EL display panel from the lowest to the highest, the light emitting area is formed smaller, and the EL display panel is stacked in order of the luminous efficiency of the colored light emitting layers to produce full color. By configuring the EL display panel, EL light-emitting elements having red, green, and blue light-emitting layers can be formed on separate substrates,
Since they can be manufactured by laminating them, the manufacturing process is easy, and since each EL light emitting element is separated by a substrate such as thin plate glass, between electrodes or between wirings connected to electrodes. This reduces the effects of crosstalk that occurs in the EL display panel, reduces dielectric breakdown, and improves reliability. Furthermore, by stacking the EL display panel, which has a light-emitting layer with low luminous efficiency, close to the surface of the full-color display panel, it is possible to The luminous efficiency of the EL display panel can be harmonized, and the luminous area of the EL display panel can be made smaller in order from the lowest to the highest luminous efficiency of the colored luminescent layer, and the EL display panel can be made smaller in order from the EL display panel with the largest luminous area to the full-color display panel. Since it is laminated on the surface, color mixing errors can be reduced.

(Example) An example of the present invention will be described with reference to the drawings.

FIG. 1 is an explanatory cross-sectional view of a full-color EL display panel according to an embodiment of the present invention.

The structure of the full color EL display panel of the embodiment is such that an EL light emitting element having a light emitting layer 24 that emits blue (B) light is formed on a thin glass substrate 21 to form a first EL display panel; An EL light emitting element having a light emitting layer 34 that emits red (R) light is formed on a substrate 31.
A third EL display panel is formed, and an EL light emitting element having a light emitting layer 44 that emits green (G) is formed on a thin glass substrate 41 to form a third EL display panel. A first EL display panel (blue light emitting), a second EL display panel (red light emitting), and a third EL display panel (green light emitting) are stacked and combined in order of proximity to the surface of the full color display panel. In this case, it is assumed that the luminous efficiency of the luminescent layer increases in the order of blue, red, and green.

To explain each EL display panel, first, the first E
The configuration of the L display panel (blue light emitting) is as follows: ITO, In, O,
, Sn02, etc., and a first insulating layer 23 made of Y, O, , Si,
An insulating layer made of Na, BaTiO, etc., and then ZnS: T m F 3 , S for emitting blue light.
r S : C e SS r S : A light emitting layer 24 made of Cu or the like is formed, and a second insulating layer 25 made of the same material as the first insulating layer 23 and a first electrode 2 are formed thereon.
2 and a transparent electrode which becomes the second electrode 26 and made of the same material are sequentially laminated.

The second EL display panel (red light emitting) has an ITOS I display panel as a first electrode 32 on a thin glass substrate 31.
A transparent electrode composed of n20, , Sn02, etc. is formed, and a first insulating layer 33 made of Y20, , Y20, etc. is formed thereon.
an insulating layer made of Si3N, % BaTiO, etc.;
Next, ZnS to emit red light: SmF, ,
A light emitting layer 34 made of CaS:Eu, SrS:Eu, etc. is formed, and a second insulating layer 35 made of the same material as the first insulating layer 33 and a second insulating layer 35 made of the same material as the first electrode 32 are formed thereon. A transparent electrode, which becomes the electrode 36 of No. 2, is sequentially laminated.

The third EL display panel (green light emitting) has a structure in which ITO is used as the first electrode 42 on a thin glass substrate 41. ．． I
n20. , Sn02, etc. is formed, and a first insulating layer 43 made of Y,0, , S
An insulating layer made of t, N, , BaTiO3, etc., and then ZnS:TbF, , CaS for emitting green light.
: A light emitting layer 44 made of Ce or the like is formed, and a second insulating layer 45 made of the same material as the first insulating layer 43 is formed thereon.
The first electrode 42 and a transparent electrode that becomes the second electrode 46 made of the same material are sequentially laminated. Note that since the second electrode 46 corresponds to the back side of the display panel, the second electrode 46 may not be made of a transparent electrode, but may be made of a metal electrode such as aluminum (A1).

Wirings are drawn out from the first electrodes 22, 32, and 42 formed on the substrates 21, 31, and 41, respectively, and E
It is connected to the L drive unit (not shown). Similarly, the second
Wirings are also drawn out from the electrodes 26, 36, and 46, respectively, and connected to the EL drive section. An EL driving voltage is applied to these wirings from an EL driving section in accordance with an image signal.

The EL drive unit applies a voltage to the first and second electrodes in accordance with an image signal obtained by converting image information such as color and brightness into a signal.

Note that when forming a full-color EL display panel by stacking the EL display panels formed on each substrate, the first EL
Second electrode 2 of EL light emitting element of display panel (blue light emitting)
6, the second electrode 36 of the EL light emitting element of the second EL display panel (red light emitting) is formed smaller, and the third electrode 36 of the EL light emitting element of the second EL display panel (red light emitting) is formed smaller. The second electrode 46 of the EL light emitting element of the EL display panel (green light emitting) is formed to be small. This is to prevent color mixing from occurring when the display panel is viewed obliquely if the size of each light-emitting area is the same.This is to prevent this deviation.

In this example, the luminous efficiency of the colored light-emitting layer increases in the order of blue, red, and green. However, depending on the material of the light-emitting layer, the colored light-emitting layer does not necessarily increase in the order of blue, red, and green. does not necessarily have high luminous efficiency.

Therefore, when the luminous efficiency of the colored luminescent layer is not high in the order of blue, red, and green, the EL display panel having the EL light-emitting element of the luminescent layer with low luminous efficiency is
EL display panels having light emitting elements are stacked. This makes it possible to change from low luminous efficiency to full color EL.
It will be placed close to the surface of the display panel.

The luminous efficiency of each material of the blue, red, and green luminescent layers is shown below. For blue, ZnS:TmF is 0. Ol
fm/W, SrS: Ce is 0, 22] II/WSSr
S:Cu is about 0.05Jm/W, and for red,
ZnS: SmF, is 0.08fl/W, CaS:
Eu is 0.05J! m/W, SrS: Eu is 0.08
fm/W, and for green, ZnS:TbF is 1
~1.5fm/W. ．． CaS: Ce is 0.11 I
ll/W.

Next, a method for manufacturing the full color EL display panel of this embodiment will be explained.

First, a method for manufacturing a first EL display panel having a blue-emitting light emitting layer 24 will be described. The substrate 21, which becomes the surface of the full-color EL display panel, is formed of glass or the like with a thickness of about 1 to 3 mm, and ITO, In, O, etc. are coated on this substrate 21.
, SnO, etc. to a thickness of 0.2 by sputtering or vapor deposition.
The first electrode 22 is deposited to a thickness of approximately μm and is formed by photolithography.
A transparent electrode is formed by patterning the transparent electrode into a desired pattern. On top of this, Y,0, ,Si,N, ,B
A film of aTiO or the like is deposited to a thickness of about 0.2 μm by a sputtering method and etched to form a first insulating layer 23 having a larger shape that covers the transparent electrode of the first electrode 22.

Z is formed on the first insulating layer 23 by a spatter method, an electron beam method, etc.
A film of nS:TmF, SrS:CeSSrS:Cu, etc. is deposited to a thickness of about 0.6 μm and etched to form a blue-emitting light emitting layer 24 having a smaller shape than the first insulating layer 23. The second insulating layer 2 is made of the same material as the first insulating layer 23 again.
5 to a thickness of 0.2 μm so as to cover the light emitting layer 24 in the same manner as above.
The second insulating layer 25 is formed by depositing ITO or the like to a thickness of about 0.2 μm on the second insulating layer 25 by sputtering or vapor deposition, and patterning by photolithography.
A transparent electrode that becomes the second electrode 26 having a smaller shape is formed. In this way, the first EL display panel is manufactured. Here, a glass plate with a thickness of about 1 to 3 mm was used as the substrate 21, but the same thickness as the substrates 31 and 41 was used.
A thin glass plate of approximately 0 μm may be used, and a thick protective glass may be adhered to this substrate.

Next, the method for manufacturing the second EL display panel having the light emitting layer 34 that emits red light is approximately the same as the method for manufacturing the first EL display panel described above, but the thin glass substrate 31 is used for the full color EL display panel. Since the surface does not become the same as that of the substrate 21, it is not necessary to make it as thick as the substrate 21, and the thickness may be approximately 50 to 100 l1m. Further, the red light emitting layer 34 is made of ZnS:
It is formed from SmF, , Cas:EuSSrS:Eu, etc. Note that the second electrode 36 in the second EL display panel is formed to have a smaller area than the second electrode 26 in the first EL display panel.

The method for manufacturing the third EL display panel having the light emitting layer 44 that emits green light is approximately the same as the method for manufacturing the first EL display panel, but the thin glass substrate 41 has a thickness similar to that of the substrate 31. The light-emitting layer 44, which is formed with a thickness of about 50 to 100 μm and emits green light, is made of ZnS:TbF, CaS:
Formed with Ce etc.

Note that the second electrode 46 in the third EL display panel is
It is assumed that it is formed in a shape having a smaller area than the second electrode 36 in the second EL display panel.

Furthermore, the second electrode 46 that forms the back surface of the display panel can be formed of a metal electrode such as aluminum (A1), but in this case, the second insulating layer 46 is formed on the second insulating layer 45.
The second electrode 46 is formed to have a shape smaller than 5 and a thickness of about 1 μm.

The EL display panels produced as described above are
The first EL display panel, the second EL display panel, and the third EL display panel are stacked in this order.

At this time, use adhesive to adhere the four corners of each board. Then, wires connected to the EL driving section are drawn out from each electrode, and sealed by applying a resin sealant such as NRICON to a thickness of about 1 mm.

In this way, a full color EL display panel is produced.

Next, a method for driving a full-color EL display panel according to an embodiment of the present invention will be described. A voltage of a specific strength is applied from the EL drive unit for a specific time to the first electrode 2 via wiring.
2, 32, 42 and simultaneously the second electrodes 26, 3
When a constant voltage is also applied to 6 and 46, the first electrode 2
Blue, red, and green light is emitted from the light emitting layers 24, 34, 44 sandwiched between the electrodes 2, 32, 42 and the second electrodes 26, 36, 46. The duration and intensity of the light emission are determined by the time and intensity of the voltage applied. In addition, by mixing each emitting color, full color display can be achieved.
If the drive unit has a gradation function, it is possible to use even more colors.

According to this embodiment, an EL light emitting element having a blue light emitting layer 24, a red light emitting layer 34, and a green light emitting layer 44 is formed on the respective substrates 21, 3] and 41.
EL display panel (blue light emitting), second EL display panel (red light emitting), and third EL display panel (green light emitting) are formed. In this case, the second electrode 2 of the first EL display panel
By forming the second electrode 36 of the second EL display panel smaller than 6, and forming the second electrode 46 of the third EL display panel smaller than the second electrode 36 of the second EL display panel. By forming a small light-emitting area in the order of blue, red, and green, and laminating the respective substrates on which each EL light-emitting element was formed in the order of blue, red, and green, a full-color EL display panel was constructed. EL with green and blue light emitting layers
Each EL display panel can be formed by forming the light emitting elements on separate substrates, and can be manufactured by laminating them, which has the effect of simplifying the manufacturing process and improving yield. Since each EL light emitting element is separated by substrates 31 and 41 such as thin plate glass, it is possible to reduce the influence of cross-tock that occurs between electrodes or between wirings connected to electrodes.
This has the effect of reducing dielectric breakdown and improving reliability.
Furthermore, in this example, since the luminous efficiency of the luminescent layer is higher in the order of blue, red, and green, the luminous efficiency of each color is improved by stacking the EL display panels emitting blue, red, and green light in the order closer to the surface of the display panel. It also has the effect of harmonizing the E of blue, red, and green light by forming smaller light emitting areas in the order of blue, red, and green.
Since the L display panels are stacked, there is an effect that color mixing deviation can be reduced.

Based on the configuration of this embodiment, a matrix display panel as shown in FIG. 2 may be used. The configuration of this matrix display panel will be specifically explained. However, in FIG. 2, the insulating layer, the light emitting layer, etc. are omitted for ease of explanation.

On the substrate 21 made of glass or the like, ITO, I
The first electrode 22 is formed in a band-like vertical stripe shape using n, O, , SnO, etc., and Y203, Si, N, , etc. are formed on it.
A first insulating layer 23 made of BaTiO, etc. is formed to cover the vertically striped first electrode 22, and a blue-emitting light emitting layer 24 is further formed on the first insulating layer 23, made of ZnS:TmF, , SrS.
:Ce, SrS: CU or the like is formed to be smaller than the first insulating layer 23, and is formed on the light emitting layer 24 as a second insulating layer 25 so as to cover the light emitting layer 24, and then on the second insulating layer 25. A band-shaped, horizontally striped transparent electrode is formed as the second electrode 26 . In this case, as shown in the plan view of FIG. 3, the intersection of the vertical striped transparent band-shaped electrode of the first electrode 22 and the horizontal striped transparent electrode of the second electrode 26 has a band-shaped width. Let's cross it at For ease of explanation,
Also in FIG. 3, the insulating layer and the light emitting layer are omitted.

Further, on the substrate 31, a transparent electrode in the form of vertical stripes as a first electrode 32, a first insulating layer 33, and a ZnS:S
mF, , CaS: Eu, S rS: A red light emitting layer 34 made of Eu, etc., a second insulating layer 35, and a second electrode 36 are formed by laminating transparent electrodes in the shape of horizontal stripes. In this case, as shown in the plan view of FIG.
The intersection of the strip-shaped transparent electrode in the vertical stripe shape of the first electrode 32 and the strip-shaped transparent electrode in the horizontal stripe shape of the second electrode 36 is such that the width of each strip-shaped transparent electrode is slightly narrower. Make the area smaller. Also in FIG. 4, the insulating layer and the light emitting layer are omitted.

Further, on the substrate 41, a transparent electrode in the form of vertical stripes as a first electrode 42, a first insulating layer 43, and a ZnS:T
bF. , CaS: A green light-emitting layer 44 made of Ce, etc., a second insulating layer 45, and a second electrode 46 are formed by laminating transparent electrodes in the form of band-like horizontal stripes. In this case, as shown in the plan view of FIG. The width of the transparent electrodes is made to intersect with each other in a shape that is slightly narrower than the narrow width of the intersection between the transparent electrodes of the red EL light emitting element, thereby further reducing the light emitting area. Also in FIG. 5, the insulating layer and the light emitting layer are omitted.

In this way, the width of the intersection of the strip-shaped transparent electrodes in each electrode is narrowed in the order of the electrodes of the blue, red, and green EL light-emitting elements because the matrix display panel of this example is viewed from an angle. This is to reduce color mixing deviation.

Wiring connected to the electrodes from this matrix display panel is connected to a flexible substrate (not shown) for each wiring layer, and signal lines for applying pulses to the flexible substrate are respectively connected.

The driving method for this matrix display panel is that the intersections of transparent electrodes in a matrix form become light-emitting areas, and the light-emitting areas dotted horizontally (light-emitting areas of horizontal lines) are emitted as a unit, and then the next horizontal line is emitted. The display panel is displayed by sequentially emitting light from the light emitting regions of the horizontal line such that the light emitting regions of the horizontal line emit light, and repeating the light emitting of the horizontal line from the top to the bottom of the display panel. (line sequential scanning method). Specifically, in the vertical transparent electrode (data line), a positive pulse is applied to the data line part of the area where you want to emit light, and a negative pulse is applied to the corresponding horizontal transparent electrode (scan line). If applied, the light emitting layer is made to emit light with a constant potential difference generated by the difference between the data line pulse and the scan line pulse.

This matrix display panel can be applied to computer display devices and the like as a flat panel display.

(Effects of the Invention) According to the present invention, an EL display panel is formed by forming EL light-emitting elements having light-emitting layers that emit light in red, green, and blue colors on respective substrates. By gradually reducing the shape of each second electrode in the EL display panel from the lowest efficiency to the highest, the light emitting area is formed smaller, and the EL display panels are stacked in order of the light emitting efficiency of the light emitting layer. By constructing a full-color EL display panel, EL light-emitting elements having red, green, and blue light-emitting layers can be formed on separate substrates, and can be manufactured by laminating them, thereby simplifying the manufacturing process. It is easy to use and has the effect of improving yield, and since each EL light emitting element is separated by a substrate such as thin glass, there is no crosstalk that occurs between electrodes or between wirings connected to electrodes. This has the effect of reducing the influence, reducing dielectric breakdown, and improving reliability.Furthermore, by stacking the EL display panel, which has a light-emitting layer with low luminous efficiency, close to the surface of the full-color EL display panel, the luminescence of each color can be improved. It has the effect of harmonizing the efficiency, and the light emitting area of the EL display panel is made smaller by increasing the light emitting efficiency of the light emitting layer from low to high.
Since they are laminated on the surface of the full-color EL display panel in order from the L display panel, there is an effect that color mixing deviation can be reduced.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional explanatory diagram of an embodiment of a full-color EL display panel of the present invention, Fig. 2 is a schematic diagram of a matrix display panel, and Fig. 3 is a plan view of the intersecting state of electrodes in a blue-emitting EL light emitting element. Fig. 4 is a plan view of the intersecting state of electrodes in a red-emitting EL light-emitting element, Fig. 5 is a plan view of the intersecting state of electrodes in a green-emitting EL light-emitting element, and Fig. 6 is a plan view of the intersecting state of electrodes in a green-emitting EL light-emitting element. FIG. 7 is an explanatory cross-sectional view of another conventional full-color EL display panel, and FIG. 8 is an explanatory cross-sectional view of another conventional full-color EL display panel. 1, 21, 81, 2, 22, 32, 3, 23, 33, 4, 24, 34, 5, 25, 35, 6, 26, 36, 41...Substrate 42... -First electrode 43...First insulating layer 44...Light emitting layer 45...Second insulating layer 46...Second electrode

Claims (1)

[Claims] A plurality of EL display panels are laminated, each of which has a first electrode, a first insulating layer, a colored light-emitting layer, a second insulating layer, and a second electrode formed in this order on a substrate. In a full-color EL display panel consisting of a full-color EL display panel, the light-emitting layer in the second EL display panel is formed to have a luminous efficiency higher than that of the luminescent layer in the first EL display panel, and the luminescent layer in the second EL display panel is The light emitting layer in the third EL display panel is formed to have a luminous efficiency higher than the luminous efficiency, and the second electrode in the second EL display panel is smaller than the second electrode in the first EL display panel. forming the third EL
a second electrode in the display panel is formed smaller than a second electrode in the second EL display panel, and the second EL display panel is provided on the first EL display panel;
A full-color EL display panel, characterized in that the third EL display panel is provided on the second EL display panel.