JPS63163491A - Color el display device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a matrix type flat display panel, and particularly to color display of an electroluminescent display device (hereinafter abbreviated as EL display device).

Prior Art As a color display method for conventional EL display devices, red (5
), green (G), and blue (B) EL light emitters are generally arranged in a configuration in which the three primary colors are arranged in sequence in the horizontal direction, as shown in Figure 4, as seen in ordinary color cathode ray tubes and color liquid crystal display devices. It is true. Here, 2 is a glass substrate, 3 is an R data electrode, 4 is a G data electrode, 5 is a B data electrode, 6 is an R-EL light emitter layer, 7 is a G@EL light emitter layer, and 8 is a B/E light emitter layer.
In the L light emitter layer, 9 is a scanning electrode, and each electrode is arranged in a lattice shape.R, G, B, and data electrodes 3, 4.5 and the scanning electrode 9 are orthogonal to each other. Further, each data electrode has a structure corresponding to each EL light emitting layer. A configuration diagram of the drive circuit of this color EL display panel 1 is shown in FIG. The R data electrode 3 is connected to the R data side driver 10, the G data electrode 4 is connected to the G data side driver 11,
The BΦ data electrode 6 is connected to a BΦ data side driver 12, and the scan electrode 9 is connected to a scan side driver 13.

Each driver has a shift register circuit and a latch circuit.

It consists of a logic circuit such as a gate circuit and an output transistor section that is turned on and off by this output signal, and drive is controlled by applying control signals such as a clock signal, transfer data display signal, and iner-pull signal to the logic circuit. . And each R, G, B data side driver 10
．． By synchronizing 11 and 12, multi-color display is possible by spatial color synthesis by sequential scanning drive of 60 scanning electrodes. If the electrode widths of the R, G, B data electrodes 3 and 4.5 are 1R2lo, 1B and the gap between each electrode is 1g, then 1 trio pitch 1 is np = nR + Ao-1-411',
+31g and l, = lo= l, = no
Then, l, =3(#0+n,).

Problems to be Solved by the Invention However, in the above-mentioned configuration, the trio pitch becomes more than three times the width of the data electrodes due to horizontally arranged multicolor display.
The problem is that the horizontal resolution becomes low. In view of the above, an object of the present invention is to provide a color KL display device with high resolution.

Means for Solving the Problems The present invention provides an EL display panel that is arranged in an orthogonal grid pattern.
．． 2. The first EL sandwiched between the first and second electrodes among the three electrodes
It has a laminated structure of a light emitting layer and a second EL light emitting layer sandwiched between the second and third electrodes, with at least two colors of red, green, and blue light emitting materials placed in one EL light emitting layer and the remaining one color being placed in the other layer. This is a color display device in which an EL light emitter layer is used, the 1st and 3rd electrodes are data electrodes, and the 2nd electrode is a scan electrode to perform line sequential scanning.

Effect of the present invention With the above-described structure, one trio is formed by two colors arranged horizontally and one color laminated thereon, and there are 6 pages, so the trio pitch is reduced to % of the conventional one, and the resolution is 1.5 times higher. is measured. In addition, the data electrode pitch for stacked one-color light emitters can be twice the data electrode pitch for horizontally arranged two-color light emitters, which doubles the electrode alternating area and improves evening brightness. It becomes possible.

Embodiment FIG. 1 is a sectional view of a color EL display device according to a first embodiment of the present invention. In the color display device, grid-like R/data electrodes 3 and G/data electrodes 4 are arranged alternately on a glass substrate 2, and R/EL light emitter layers 6 and G-E
An L light emitter layer 7 is formed corresponding to each data electrode 3.4, and a grid-shaped scanning electrode 9 is arranged orthogonally to the R-G data electrodes 3.4 to constitute a first EL light emitter.

Next, a second light emitter is constructed by sequentially stacking a B-EL light emitter layer 8 on the scan electrode 9 and a grid-shaped B data electrode 5 that is perpendicular to the scan electrode 9.

In the line forward scanning drive, the scanning electrode 9 is used as a common scanning electrode for the first EL light emitter and the second EL light emitter, so basically the drive circuit of FIG. 5 of the conventional example is used. It can be driven by the configuration. A multicolor display is performed using a two-stage configuration of a first EL light emitter and a second EL light emitter, and the trio pitch in this configuration is determined.

Now, R・Data electrode width 'xlR, C-・Data electrode width t
The width of the lG, B and data electrodes is 6, and the gap between each electrode is 4.
and 1B=lR+lG+l. Therefore, the pitch of the B-data electrodes 5 is twice the pitch of the R-G data electrodes 3.4.f) The B-EL light-emitting layer block is located in correspondence with a pair of R-GEL light-emitting layer blocks. It turns out. Therefore, the trio pitches are lp=%+4+2-
4B+4. If it is shown as 1R=lG=40, then = 2
(10+1g). In other words, by layering a part of the light emitter, the trio pitch becomes % of the conventional one.
The horizontal resolution will be improved by 1.5 times. The multicolor display is displayed as a spatial two-dimensional combination (yellow) with the R-EL luminescent layer 6 and the G-EL luminescent layer 7 of the first EL luminescent body, and the R-EL luminescent layer 6 of the first EL luminescent body Or, the G/EL light emitter layer 7 and the second EL light emitter B, EL light emitting 7 base, body layer 8 are the overlapping parts of the data electrodes 3 and 4.5, which is an additive two-color mixture (magenta or cyan). Color) Others are displayed as a spatial two-color mixture (magenta or cyan), and the R/EL light emitter layer 6 of the first EL light emitter and the G, EL
Luminous layer 7 and second EI.

Addition of 3 colors of light emitter B and EL light emitter layer 8 (white)
is displayed. FIG. 2 shows another embodiment in which the light emitting layers of FIG. 1 are reversed, and the first EL light emitter has B, EL
This is an example in which the light emitting layer 8 is arranged as the second EL light emitting body, and the R, EL light emitting layer 6 and the G-EL light emitting layer 7 are arranged.

By the way, regarding the material of the electrodes, all are transparent electrodes (To
However, there is a method of using a metal electrode such as aluminum for the purpose of improving the brightness and lowering the electrode resistance by using the total optical reflection effect only for the final back electrode of the stack, but the latter method generally has many advantages. used. In FIG. 1, the B/data electrode 5 corresponds to the back electrode, and β3〉lR
+4°, the capacitive load of one pixel is twice as much as that of the R-G data electrode 3.4, so in terms of the charging time constant, it is preferable that the B-data electrode 5 has as little force as possible, and if it is a metal electrode, then The force of the structure shown in FIG. 1 is preferable from the driving aspect because it can be made about one order of magnitude smaller than that of the transparent electrode.

- From the viewpoint of manufacturing an EL display panel with a multi-stage configuration, the flatter the laminated films, the easier it is to manufacture. In this regard, in FIG. 1, since the first EL light emitter is composed of two types of EL light emitting layers, the surface after the formation of the first KL light emitter is highly uneven, which has a large influence on the subsequent lamination. In the construction method shown in FIG. 2, since the first EL light emitter is only one type of KL light emitter layer, the process up to the scanning electrode process is equivalent to that of a conventional monochrome EL display panel, and manufacturing is easier than in FIG. Like this E
Depending on the arrangement of the L emitter layers, EL display devices each having their own characteristics can be constructed.

Also, Fig. 3 shows the multicolor arrangement in the lateral force direction (in Fig. 1, the 1EL
Figure 2 shows the arrangement method for the R-(, EL) layer of the second EL emitter, and the data electrode 3 of each emitter layer. , 4 in a lattice-like arrangement in parallel with the data electrodes 3 .
This is an example in which the electrodes 4 and scanning electrodes are alternately arranged on the page 9. In this case, the R/G data side drivers 10, 11 connected to the R/G data electrodes 3, 4 can perform normal display by exchanging the R/G transfer data display signals every scanning line. -If you think about power and brightness, brightness is proportional to the display area. In the case of this embodiment, the brightness of each color is proportional to the width of each data electrode (lRllG, lB) since the scanning electrode is common.

By the way, generally speaking, the luminous efficiency of each color as an EL light emitter is G.
>R>B, and the luminous efficiency of blue light is particularly poor. It is also possible to apparently compensate for such a decrease in luminous efficiency by increasing the luminous area (increasing the width of the data electrode) and improve the brightness. Also, if it is possible to create something with the same R-G@B luminous efficiency, the brightness mixing condition of white light as usually said is BG:BR:BB-6:3:1 (BG: green brightness, BR: red luminance, BB: blue luminance), each data electrode width 1c, data electrode width 1G, R, data electrode width IR"qo, 51G, B *data electrode width IB-
, c), 1elG, and if the R-EL emitter layer 6 and the 0A-7 B,B:L emitter layer 8 are arranged in the first EL emitter, and the G-EL emitter layer 7 is arranged in the second EL emitter, Since the peak values of the drive voltages from each driver can be made the same, only one set of power supplies for modulation and write voltages is required for driving. In either case, trio pitches are possible in conventional %. Furthermore, IB = 2
1Q, 11. = IQ ” In the case of IQ, the blue light emitting area is twice that of red and green! 1l The EL element capacitance is also twice as large, but since the electrode width is twice as large, the Bφ data electrode resistance R
B is A of the RG data electrode resistance RR9RG. Since the charging time constants due to the drive voltages are all the same for the KL elements of each color as in the conventional case, there is no effect on the scanning time (address time). In addition to the embodiments of the present invention, the first and second EL light emitters are arranged above and below the scanning electrode, and one of the first and second light emitters has two types of red, green, and blue EL light emitters. It is effective if the data electrodes are arranged alternately and the other is made up of the remaining KL light emitters, and the data electrodes are also arranged corresponding to the EL light emitters of each color. In addition, there are two types of E for data electrodes.
The data electrode width of the EL emitter with the L emitter layer is 11.1. .

11h/ and electrode gap 'kn, only one type of KL luminescent layer g
+2 If the data electrode width of the EL light emitter is 43 and the electrode gap is 4, then the trio pitch lp is 4. =11+12+
The data electrode width may be arbitrary as long as the relationship is 21,2=n3+βg. Further, in the present invention, the EL display element can be either a thin film type or a thick film type.

As described in detail, according to the present invention, the three primary color EL light emitters are divided into two types and one type as the 1st 2EL light emitter with a two-stage configuration having a scanning electrode in the center, and a trio pitch is achieved. The horizontal resolution can be reduced to 1.5% of the conventional value, and the practical effect is great.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a color EL display device according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of a color KL display device according to another embodiment of the present invention, and FIG. 3 is a cross-sectional view of a color KL display device according to another embodiment of the present invention. FIG. 4 is a sectional view of a conventional color EL display device, and FIG. 5 is a block diagram of a drive circuit for driving the conventional color EL display device. 3...R data electrode, 4...G data electrode, 5...B data electrode, 6...
...R-EL light emitter layer, 7...G, EL light emitter layer, 8...B, EL light emitter layer, 9...
scanning electrode. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 3
Figure (A, CB) Figure 4 Figure 5

Claims (1)

[Claims] A first electrode in a grid shape on a transparent substrate, a first EL light emitting layer, a second electrode in a grid shape perpendicular to the first electrode, a second EL light emitter layer, and a second electrode in a grid shape perpendicular to the second electrode. A color EL display device configured by sequentially laminating three electrodes, the first
The EL light emitter layer (second light emitter layer) is connected to the first electrode (third electrode).
Two types of EL out of red, green, and blue EL light emitters correspond to
The light emitting layer is arranged alternately for each electrode, and the second EL
The luminescent layer (first luminescent layer) is replaced by the first EL luminescent layer (second E luminescent layer).
The third electrode (first electrode) pitch is twice the average pitch of the first electrode (third electrode), and the first electrode is the first EL light emitter layer. The third electrode is used as a data electrode for display control of the second EL light emitting layer, the second electrode is used as a scan electrode, and a driver connected to each data electrode and the scan electrode performs line-sequential scan driving. A color EL display device characterized by: