JP2000150173A - Flat-panel display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To homogenize a display characteristic such as gradation and color reproductivity at the right and left, and the upper and lower ends of a display screen. SOLUTION: This device has a glass substrate 11, n-rows of stripe type column electrodes Y1 to Y640 arrayed on the glass substrate 11 in a row direction, white light emitting EL elements 12 arrayed on the entire surface of the column electrodes Y1 to Y640, and m-columns of stripe type row electrodes X1 to X480 arrayed on the white light emitting EL element 12 laid in a column direction orthogonal with the column electrodes Y1 to Y640. In addition, feed points are respectively provided approximately at the centers of the column electrodes Y1 to Y640 and the row electrodes X1 to X480, and drive voltage is applied from the feed points. According to this construction, a voltage drop distribution from each feed point to each end of the column electrode Y1 to Y640 can be made uniform. Similarly, a voltage drop from each feed point to each end of the row electrodes X1 to X480 can be made approximately uniform. Thus, irregular brightness can be eliminated from the right and left, and the upper and lower parts of a screen.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an organic thin film EL.
The present invention relates to a flat panel display device suitable for application to a large flat panel display in which an (electroluminescent) panel or an electroluminescent panel is laid in a tile shape. More specifically, a striped first electrode of n rows arranged in a row direction on one surface of a plate-shaped light emitting thin film member, and a striped second electrode of m columns arranged in a column direction on the other surface. Each of the electrodes is provided with a feeding point substantially at the center thereof so that display characteristics such as gradation and color reproducibility at the left, right, upper and lower ends of the display screen can be equalized.

[0002]

2. Description of the Related Art In recent years, an organic thin film EL (Electroluminesc) has been developed.
With respect to a flat display device having an ent) element, a small one may be applied to a vehicle-mounted information display or the like, and a large one may be applied to a wall-mounted display device which is laid in a tile shape.

FIG. 10 is a conceptual diagram showing an example of the configuration of a conventional flat panel display device 10 as viewed from the back. This type of flat display device 10 forms an organic EL display and has a glass substrate 1 shown in FIG. For example, VGA display 4
In the case of an organic EL display of 80 × 640 pixels,
In a row direction on the glass substrate 1, striped column electrodes Y1 to Y640 of n = 640 rows are arranged.

[0004] For example, a white light emitting EL element 2 is disposed on the entire surface of the column electrodes Y1 to Y640. On the white light emitting EL element 2 in the column direction orthogonal to the column electrodes Y1 to Y640, striped row electrodes X1 to X480 of m = 480 columns are arranged. In the conventional method, each of the column electrodes Y1 to Y640 and the row electrodes X1 to X480 is provided with a feed point indicated by a black square mark in FIG.

That is, a printed board 3A is disposed on the upper right side of the glass substrate 1, and a driver IC 4A is soldered on the printed board 3A. This driver IC 4A
Are the upper half row electrodes X1 to X24 of the glass substrate 1 in the column direction.
0 is connected via a flexible wiring 5A, and a driving voltage for pixel selection is supplied to the row electrodes X1 to X240. Similarly, a printed circuit board 3B is disposed on the lower right side of the glass substrate 1, and a driver IC is provided on the substrate 3B.
4B is soldered. This driver IC 4B
The lower half row electrodes X241 to X480 are connected via flexible wiring 5B to the lower half of the row electrodes X241 to X480.
A driving voltage for pixel selection is supplied to X480.

Further, a printed board 3C is arranged on the upper left side of the glass substrate 1, and a driver I is provided on the printed board 3C.
C4C is soldered. This driver IC4C
Is connected to the left half column electrodes Y1 to Y320 in the row direction via the flexible wiring 5C, and supplied with a driving voltage. Similarly, a printed board 3D is arranged on the upper right side of the glass substrate 1, and a driver IC 4D is soldered on the printed board 3D. This driver IC4D
Is connected to the right-half column electrodes Y321 to Y640 in the row direction via the flexible wiring 5D, and a driving voltage for pixel display is supplied to the column electrodes Y321 to Y640.

[0007]

According to the conventional flat panel display device 10, when the row electrodes X1 to X480 and the column electrodes Y1 to Y640 are drawn, each of the electrodes X
Feed points are provided at or near the end portions of 1 to X480 and Y1 to Y640, and these feed points are connected to the driver ICs 4A to 4D soldered to the printed circuit boards 3A to 3D.
4D is connected by flexible wirings 5A to 5D or the like.

Generally, the row electrodes X1 to X48 inside the panel
In addition, the column electrodes Y1 to Y640 have an electric resistance generated by the specific resistance of the electrodes themselves and a parasitic capacitance generated between the row electrodes X1 to X480 and the column electrodes Y1 to Y640. The above-described electric resistance increases due to restrictions on electrode materials and the like, and the parasitic capacitance increases due to structural restrictions such as the distance between electrodes.

For this reason, the flat display device 10 shown in FIG.
In the circuit example in which one line of the row electrode is extracted, the signal voltage waveform supplied to the rightmost pixel of the display screen and the signal voltage waveform supplied to the leftmost pixel greatly differ.

[0010] This is because the signal voltage supplied from the feeding point P in the signal voltage waveform of the rightmost pixel depends on the electric resistance R of the intermediate electrode and the parasitic capacitance C of the rightmost pixel. It is considered that the signal voltage waveform is dull due to the integration. Therefore, the luminance characteristic and the gradation characteristic are different between the right end side and the left end side of the screen, and the uniformity of the image is greatly impaired especially in the peripheral portion of the panel.

Accordingly, when a large flat display is constructed by laying a plurality of flat display devices 10 in a tile shape, brightness unevenness occurs at the joints of the flat display devices 10, which hinders an improvement in display quality. There is a problem.

In view of the above, the present invention has been made in view of the above-mentioned problems, and has a flat display device capable of equalizing display characteristics such as gradation and color reproducibility at the left, right, upper and lower ends of a display screen. The purpose is to provide.

[0013]

An object of the present invention is to provide a substrate, an n-row striped first electrode arranged in a row direction on the substrate, and a plate-shaped electrode arranged on the entire surface of the first electrode. And a m-row stripe-shaped second electrode disposed on the light-emitting thin-film member in a column direction orthogonal to the first electrode. Each of the first and second electrodes has a substantially central portion in each of the first and second electrodes. Is provided, and a driving voltage is supplied from the feeding point.

According to the present invention, each of the first and second electrodes is provided with a feeding point substantially at the center thereof, and a driving voltage is supplied from the feeding point.

For example, in the case where the number of first electrodes in n rows is divided into p in the row direction of the substrate and the number of second electrodes in m columns is divided by q in the column direction of the substrate, The number of one electrode is p
A drive voltage is supplied to each of the divided electrode groups by the first to p-th drive circuits, and the number of second electrodes is represented by q
A drive voltage is supplied to each of the divided electrode groups by the first to qth drive circuits.

Therefore, the voltage drop distribution from each feeding point to each end of the first electrode can be equalized.
Similarly, since the voltage drop from each feeding point to each end of the second electrode can be made substantially equal, unevenness in the brightness in the left, right, up, and down directions can be eliminated.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a flat display device according to an embodiment of the present invention will be described with reference to the drawings. (1) First Embodiment FIG. 1 is a conceptual diagram viewed from the rear showing a configuration example of a flat panel display device 100 as a first embodiment according to the present invention.

In this embodiment, the striped first electrodes are arranged in n rows in the row direction on one surface of the panel-shaped light-emitting thin film member, and the striped second electrodes are arranged in the column direction on the other surface in the direction of m. Each of the first and second electrodes is arranged in a row, and each of the first and second electrodes is provided with a power supply point at a substantially central portion, and a drive voltage is supplied from the power supply point to be applied to pixels at the left, right, upper, and lower ends of the display screen. Signal waveforms are made equal at both ends and upper and lower ends of the screen, and display characteristics such as gradation and color reproducibility at the left, right, upper and lower ends of the display screen can be made uniform.

The flat display device 100 according to the present invention is an organic EL device.
It forms a display and has a glass substrate 11 shown in FIG. This glass substrate side is the display screen side as the flat panel display 100. For example, 480 × 6 in VGA display
In the case of an organic EL display having 40 pixels, strip-shaped column electrodes (first electrodes) Y1 to Y640 of n = 640 rows are arranged in the row direction on the glass substrate 11. The column electrodes Y1 to Y640 are made of, for example, ITO (Indium Ti).
n Oxide) film.

On the entire surface of the column electrodes Y1 to Y640, for example, a white light emitting EL element 12 is formed as a plate-shaped light emitting thin film member.
Is arranged. For example, on the white light emitting EL element 12 in a column direction orthogonal to each of the column electrodes Y1 to Y640, for example,
m = 480 rows of striped row electrodes (second electrodes) X
1 to Y480 are arranged. These row electrodes X1 to X480
Is composed of a metal electrode such as an aluminum film.

Hereinafter, in this example, the column electrodes Y1 to Y64
0 and the case where the row electrodes X1 to X48 are provided. Therefore, each of the column electrodes Y1 to Y640 and the row electrodes X1 to X480 becomes an electrode lead connection portion substantially at the center, that is, at a position equidistant from the pixels at both ends of the electrode. Points are provided. In this example, the drive voltage is supplied from these feed points, and these feed points are, of course,
0 is drawn not from the display screen side but from the back side thereof.

For example, focusing on the row electrode X1 on the first line, the pixel at the left end of the screen is the intersection of the row electrode X1 and the column electrode Y1. If this is expressed as a pixel (X1, Y1), the pixel at the right end of the screen can be expressed as (X1, Y640). Assuming that the length of the line segment connecting the pixels is L, the pixel pitch is usually set at an equal interval. Therefore, the feed point of the row electrode on the first line is at the position of L / 2, that is, the pixel (X1, Y320) and the pixel (X1, Y321). Hereinafter, similarly, the feeding points of the row electrodes on the second line are the pixels (X2, Y320) and the pixels (X2, Y321).
And the feeding point of the row electrode on the 480th line is the pixel (X480, Y320) and the pixel (X480, Y321).
Between the positions.

When focusing on the column electrode Y1 in the first row, the pixel at the upper end of the screen is (X1, Y1), and the pixel at the lower end of the screen can be expressed as (X480, Y1). Assuming that the length of the line segment connecting the pixels is M, the pixel pitch is usually set at an equal interval. Therefore, the feeding point of the column electrode in the first row is at the position of M / 2, that is, the pixel (X240, Y1) and the pixel (X241, Y1). Hereinafter, similarly, the feeding point of the column electrode in the second row is set to the pixel (X24
0, Y2) and the pixel (X241, Y2),
The feeding point of the column electrode in the 640th row is a pixel (X240, Y6
40) and the pixel (X241, Y640).

Further, a printed board 13A is disposed on the upper right side of the glass substrate 11, and a driver IC 14A is soldered on the printed board 13A. This driver I
C14A is a 2nd electrode provided at the position of L / 2 in all of the row electrodes X1 to X240 in the upper half of the glass substrate 11 in the column direction.
It is connected to 40 feeding points, and its row electrodes X1 to X24
A drive voltage for pixel selection is supplied to the 0 group. The printed circuit board 13 and each of the power supply points are connected by a flexible wiring (substrate) 15A fixed by an anisotropic conductive film in a state where, for example, 240 lead wires are arranged in a horizontal direction.

Similarly, a printed circuit board 13B is arranged on the lower left side of the glass substrate 11, and a driver IC 14B is soldered on the printed circuit board 13B. The driver IC 14B has a lower half row electrode X24 in the column direction.
Each of 1 to X480 is connected to the remaining 240 feeding points provided at L / 2, and a driving voltage for pixel selection is supplied to the group of row electrodes X241 to X480. The printed circuit board 13B and each power supply point are connected by the flexible wiring (board) 15B as described above. The above-described driver ICs 14A and 14B constitute first to q-th drive circuits.

Further, a printed circuit board 13C is disposed on the upper left side of the glass substrate 11, and a driver IC 14C is soldered on the printed circuit board 13C. This driver I
C14C is a left half column electrode Y1 to Y in the row direction.
Each of 320 is connected to 320 feeding points provided at L / 2, and a driving voltage for pixel display is supplied to a group of column electrodes Y1 to Y320. Printed circuit board 13
C and each feeding point are connected by a flexible wiring (substrate) 15C in which 320 lead wires are fixed by the above-described anisotropic conductive film.

Similarly, a printed circuit board 13D is disposed on the lower right side of the glass substrate 11, and a driver IC 14D is soldered on the printed circuit board 13D. The driver IC 14D has a column electrode Y in the right half in the row direction.
The remaining 320 provided in L / 2 for any of 321 to Y640
Column electrodes Y321 to Y640
Are supplied with a driving voltage for pixel display. The printed circuit board 13D and each power supply point are connected by the flexible wiring 15D as described above. The above-described driver ICs 14C and 14D constitute first to p-th drive circuits.

Next, the cell structure of the flat panel display 100 will be described. For example, in the monochrome organic EL cell 40 shown in FIG. 2, a column electrode 41 having a film thickness of about several hundreds to several thousand degrees, which forms a transparent electrode, is formed on the glass substrate 11 in a stripe shape. Form the anode. On the column electrode 41 and around the electrode 41, an organic layer 42 having a thickness of about several hundreds to several thousand degrees is formed. The organic layer 42 includes an organic hole transport layer 42A for transmitting holes, an organic light emitting layer 42B for emitting fluorescence, and an organic electron transport layer 4 for transmitting electrons.
2C.

In this example, the organic layer 42 has a white light emitting EL
Element 12 is used. Of course, the white light emitting EL element 1
It is not limited to two. A red light emitting EL element, a blue light emitting EL element, and a green light emitting EL element may be used.

A row electrode 43 made of a metal electrode is formed in a stripe on the organic electron transport layer 42C. The row electrode 43 forms a cathode, and Al which easily emits electrons.
A Li alloy is used. When a color thin film display is constructed, R (red), G (green), B
Each filter of (blue) is provided between the glass substrate 11 and the transparent electrode.

Next, the light emission principle of the organic EL cell 40 will be described. For example, the negative electrode of the DC power supply is connected to the row electrode 43 shown in FIG.
A DC voltage of about 0 to 15 V is supplied.

Then, a current is injected from the column electrode 41.
Then, the organic layer 42 in the center emits light. That is,
The holes transmitted from the hole transport layer 12A and the organic
Organic emission from electrons transmitted from the electron transport layer 43C.
An exciton is formed in the optical layer 42B, and the exciton causes an organic
Fluorescence is emitted from the light emitting layer 42B. The organic EL cell of this example
Current density is 0.01 A / cm^TwoUnder the excitation conditions of
Brightness is 100 cd / m^Two And the efficiency is about 1 lm / W
You.

Therefore, the column electrode 4 on the glass substrate 11
If a point where 1 and the row electrode 43 intersect is defined as one pixel, a color filter is provided between the glass substrate 11 and the column electrode 41, and the pixel is selected in a time-division manner, so that color display can be performed. Can be.

Next, the operation of the flat panel display 100 will be described. For example, when p = q = 2, the glass substrate 1
A driving voltage is supplied from the driver IC 14A to the upper half row electrodes X1 to X240 in the column direction, and a driving voltage is supplied from the driver IC 14B to the lower half row electrodes X241 to X480 in the column direction. The drive voltage is supplied from the driver IC 14C to the right half column electrodes Y1 to Y320 of the right half, and the left half column electrodes Y321 to Y6 in the row direction are provided.
A drive voltage is supplied to 40 from the driver IC 14D.

Here, focusing on the column electrode Yi on the i-th line shown in FIG. 4, the feeding point P in this example is located at the position of L / 2, that is, the pixel (X240, Yi) and the pixel (X241, Y
i). Since the driving voltage is supplied to the column electrode Yi from the feeding point P, the left end pixel (X1, Yi) from the feeding point P and the left end pixel (X48) from the feeding point P.
0, Yi) can be equalized.

This is because the electrode resistance R1 from the feeding point P to the left end pixel (X1, Yi) shown in FIG. 5 is almost equal to the electrode resistance R2 from the feeding point P to the right end pixel (X480, Yi). By becoming. Therefore, the leftmost pixel (X1, Y
Even if the capacitance C1 is parasitic on i) and the almost same capacitance C2 is parasitic on the rightmost pixel (X480, Yi), the electrode resistance values R1 and R2 are almost equal, so the leftmost pixel (X1, Yi). ) And the drive signal waveform applied to the right end pixel (X480, Yi) can be made equal.

The same can be said for the case of the row electrodes X1 to X480. Although not shown, the j-th
The feed point of the column electrode in the row is at the position of M / 2, that is,
The position is between the pixel (Xj, Y320) and the pixel (Xj, Y321). Since a driving voltage is supplied to the row electrode Xj from this feeding point, the upper end pixel (Xj, Y1) is fed from the feeding point.
Further, the voltage drop distribution of each of the lower-end pixels (Xj, Y640) from the feeding point can be equalized.

Accordingly, it is possible to eliminate unevenness in brightness on the left, right, top and bottom of the display screen of the flat panel display device 100. As described above, since the signal voltage waveforms applied to the pixels at the left, right, upper and lower ends of the display screen are equal at both ends and upper and lower ends of the screen, the gradation and color reproducibility at the left, right and upper and lower ends of the display screen are equal. Etc. can be equalized.

(2) Second Embodiment FIG. 6 is a conceptual diagram viewed from the rear showing an example of the configuration of a flat display device 200 according to a second embodiment of the present invention. FIG. 7 is a cross-sectional view showing an example of supplying the driving voltage.

In this embodiment, the column electrode Y1 of n rows
To Y640, a first wiring is electrically connected in parallel, and similarly, a second wiring is electrically connected in parallel to each of the m rows of row electrodes X1 to X480. is there. The column electrodes Y1 to Y640 and the first
A power supply point is provided at one end of the electrode wiring formed in a loop by the wiring described above, and a driving voltage is supplied from the power supply point. Similarly, the electrode wiring formed in a loop by the row electrodes X1 to X480 and the second wiring Is provided with a feeding point at one end, and a driving voltage is supplied from the feeding point.

This flat panel display 200 has a glass substrate 21 shown in FIG. Also in this example, an organic EL display of 480 × 640 pixels is configured to perform VGA display. In the row direction on the glass substrate 21, n = 64
Stripe-shaped column electrodes Y1 to Y640 of row 0 are arranged. Also on the entire surface of the column electrodes Y1 to Y640,
A white light emitting EL element 12 is arranged, and m
= 480 rows of striped row electrodes X1 to X480 are arranged.

For example, focusing on the column electrode Y1 in the first row, a wiring 23 for short-circuiting in the column direction is provided as a first wiring on the column electrode Y1, and the upper end pixel (X
1, Y1) and the lower end pixel (X480, Y1) are electrically connected in parallel so as to be short-circuited. In this example, the above-described feeding point is provided on the upper left side of the glass substrate 21. Hereinafter, similarly, the wiring 23 is also provided on the column electrode Y2 of the second row, and is electrically connected in parallel so as to short-circuit the upper end pixel (X1, Y2) and the lower end pixel (X480, Y2). A power supply point is provided on the upper left side of the glass substrate 21. The wiring 23 is also provided on the column electrode Y640 of the 640th row.
Are provided, and the upper end pixel (X1, Y640) and the lower end pixel (X4
80, Y640) are electrically connected in parallel so as to short-circuit, and a feeding point is provided on the upper right end side of the glass substrate 21.

Focusing on the row electrode X1 on the first line, a row-direction shorting wire 22 as a second wire is provided on the row electrode X1, and the leftmost pixel (X
1, Y1) and the right end pixel (X1, Y640) are electrically connected in parallel so as to be short-circuited. A member having a small resistance value is used for the wiring 22. Aluminum wires, copper wires, silver wires, etc. are used for the wiring members. Of course, a wire rod obtained by injecting impurities into polycrystalline silicon may be used.

In this example, the above-described feeding point is provided on the right end side of the glass substrate 21. Hereinafter, similarly,
The wiring 22 is also provided on the row electrode X2 of the second line, and the left end pixel (X2, Y1) and the right end pixel (X2, Y64)
0) are electrically connected in parallel so as to short-circuit, and a feeding point is provided on the right end side of the glass substrate 21. The wiring 22 is provided on the row electrode X480 on the 480th line, and is electrically connected in parallel so as to short-circuit the left end pixel (X480, Y1) and the right end pixel (X480, Y640).
A power supply point is provided on the right end side of.

A printed circuit board 24A is disposed on the upper right side of the glass substrate 21. The driver IC 25A soldered on the printed circuit board 24A causes the glass substrate 21 to be mounted.
A driving voltage for pixel selection is supplied to the upper half row electrodes X1 to X240 in the column direction. The printed circuit board 24A and each power supply point are connected by a flexible wiring (substrate) 26A having the same material structure as that of the first embodiment.

Similarly, a printed circuit board 24B is disposed at the lower right side of the glass substrate 21. The driver IC 25B soldered to the printed circuit board 24B mounts the printed circuit board 24B.
A driving voltage for pixel selection is supplied to the lower half row electrodes X241 to X480 in the column direction. The feeding point of each of the printed circuit boards 24B is the flexible wiring (board) 26 described above.
B is connected.

A printed circuit board 24C is disposed on the upper left side of the glass substrate 21. The driver IC 25C soldered on the printed circuit board 24C allows the glass substrate 21C to be mounted.
The display driving voltage is supplied to the left half column electrodes Y1 to Y320 in the row direction. The printed circuit board 24C and each power supply point are connected by a flexible wiring (board) 26C similar to that of the first embodiment.

Similarly, a printed circuit board 24D is disposed on the upper left side of the glass substrate 21. The driver IC 25D soldered on the substrate 24D allows the left half column electrodes Y321 to Y321. A drive voltage for display is supplied to Y640. This printed circuit board 24D
And the respective feeding points are connected by the above-described flexible wiring (substrate) 26D.

Next, the operation of the flat panel display 200 will be described. For example, a driving voltage is supplied from the driver IC 25A to the upper half row electrodes X1 to X240 in the column direction of the glass substrate 21, and the lower half row electrodes X241 to X480 in the column direction.
Is supplied with a driving voltage from the driver IC 25B, a driving voltage is supplied from the driver IC 25C to the left half column electrodes Y1 to Y320 in the row direction, and a driver IC 25D is supplied to the right half column electrodes Y321 to Y640 in the row direction. Supplies a drive voltage.

Here, a wiring having a resistance value close to "0" Ω is used without limitation. Paying attention to the column electrode Yi on the i-th line shown in FIG. 7, the feeding point in this example is two of the position P1 of the left end pixel (X1, Yi) and the position P2 = b of the right end pixel (X480, Yi). Location. These two feeding points P1 and P2 can be regarded as having the same potential. This is because the wiring 22 can be formed to have a thickness of about several tens to several thousand μm as compared with the column electrode Yi having a thickness of several hundred Å, so that its electric resistance can be extremely reduced.

Therefore, a drive voltage is supplied to the column electrode Yi from the two feeding points P1 and P2, and the feeding point P1
It is possible to equalize the left and right voltage drop distributions from 1 to the central pixel (X240, Yi) not shown and from the feeding point P2 to the central pixel (X241, Yi). This allows
As in the first embodiment, the drive signal waveforms applied to the leftmost pixel (X1, Yi) and the rightmost pixel (X480, Yi) can be made equal. The same can be said for the row electrodes X1 to X480 connected to the wiring 23 shown in FIG. 6, but the description is omitted.

As described above, the luminance unevenness in the left, right, upper and lower sides of the display screen of the flat display device 200 can be eliminated as in the first embodiment. Display characteristics such as reproducibility can be made uniform.

(3) Third Embodiment FIG. 8 is a conceptual diagram viewed from the back showing a configuration example of a flat display device 300 as a third embodiment according to the present invention. In this embodiment, a divided drive system (p = 2 and q = 2) in which a column electrode group in a panel is divided vertically and a drive signal is given.
In the case of adopting 2), the display uniformity of the flat panel display device 300 is improved by making equal the display characteristics of the adjacent column electrode portions at, for example, the cut portions of the column electrodes divided in the panel. It is something that can be improved.

This flat panel display 300 has a glass substrate 31 shown in FIG. Also in this example, an organic EL display of 480 × 640 pixels is configured to perform VGA display. In this example, in the column direction on the glass substrate 31, the electrode itself is divided into two (q = 2) at the center of the panel in the upper and lower directions (UP / DOWN), that is, the row electrode X 240 N = 640 rows of striped column electrodes Y separated from the row electrodes X241
1U to Y640U and column electrodes Y1D to Y640D are arranged.

Here, column electrodes Y1U to Y640U are arranged above the isolation region, and column electrodes Y1D to Y640D are arranged below the isolation region. This electrode arrangement is for reducing the duty ratio of the drive voltage supplied to the column electrode Yi to 1/2. A white light-emitting EL element 12 is also arranged on the entire surface of the column electrodes Y1 to Y640. On the element, striped row electrodes X1 to X48 of m = 480 columns are provided.
0 is arranged.

In this example, a printed board 32A is disposed on the upper right side of the glass substrate 31, and a driver IC 33A is soldered on the printed board 32A. The driver IC 33A is connected to 240 feeding points provided at the position of L / 2, all of the upper half row electrodes X1 to X240 of the glass substrate 31 in the column direction.
A driving voltage for pixel selection is supplied to the group of X240. The printed circuit board 32A and each power supply point are connected by a flexible wiring (board) 34A in the same manner as in the first embodiment.

A printed circuit board 32B is disposed on the lower left side of the glass substrate 31, and a driver IC 33B is soldered on the printed circuit board 32B. This driver IC
33B is a lower half row electrode X241 to X480 in the column direction.
Are connected to the remaining 240 feeding points provided at L / 2, and a driving voltage for pixel selection is supplied to a group of the row electrodes X241 to X480. Printed circuit board 32B
And each feed point is a flexible wiring 3 as described above.
4B.

Further, a printed circuit board 32C is disposed on the upper left side of the glass substrate 31, and a driver IC 33C is soldered on the printed circuit board 32C. This driver I
C33C is an upper column electrode Y1U to Y3 in the row direction.
Each of the 20Us is connected to the M / 4 position, that is, 320 feeding points provided between the row electrode X120 and the row electrode X121, and the group of the column electrodes Y1U to Y320U is supplied with a driving voltage for pixel display. Is supplied. Printed circuit board 3
2C and each feeding point are connected by a flexible wiring 34C as in the first embodiment.

Similarly, a printed board 32D is arranged on the upper right side of the glass substrate 31, and a driver IC 33D is soldered on the printed board 32D. This driver IC 33D is connected to an upper column electrode Y32 in the row direction.
Each of 1U to Y640U is connected to the M / 4 position, that is, to 320 feeding points provided between the row electrode X120 and the row electrode X121, and a group of column electrodes Y321U to Y640U for pixel display. A driving voltage is supplied. The printed circuit board 32D and each power supply point are connected by a flexible wiring 34D as in the first embodiment.

Further, a printed circuit board 32E is disposed on the lower left side of the glass substrate 31, and a driver IC 33E is soldered on the printed circuit board 32E. This driver I
C33E is a lower column electrode Y1D to Y3 in the row direction.
Each of the 20Ds is connected to the M / 4 position, that is, 320 feeding points provided between the row electrode X360 and the row electrode X361. Is supplied. Printed circuit board 3
2 and each feeding point are connected by a flexible wiring 34E as in the first embodiment.

Similarly, a printed circuit board 32F is arranged on the lower right side of the glass substrate 31, and a driver IC 33F is soldered on the printed circuit board 32F. The driver IC 33F has a lower column electrode Y32 in the column direction.
Any of 1D to Y640D is connected to the M / 4 position, that is, to 320 feeding points provided between the row electrode X360 and the row electrode X361, and a group of column electrodes Y321D to Y640D is used for pixel display. A driving voltage is supplied. The printed circuit board 32F and each power supply point are connected by a flexible wiring 34F as in the first embodiment. In this example, the first to q-th driver ICs 33A and 33B
And two sets of first to p-th drive circuits are configured by the driver ICs 33C to 33F.

Next, the operation of the flat panel display 300 will be described. In this example, the column electrode Yi of n = 640 rows is divided into q = 2 in the column direction of the glass substrate 31, and this n
The number of column electrodes in a row is divided into p = 2 in the row direction, and the number of row electrodes Xi in m = 480 columns is reduced to q = 2 in the column direction.
It is assumed that it is used by dividing into

For example, a driving voltage is supplied from the driver IC 33A to the upper half row electrodes X1 to X240 of the glass substrate 31 in the column direction, and the lower half row electrode X24 of the column direction is supplied.
A drive voltage is supplied to 1 to X480 from the driver IC 33B, and column electrodes Y1U to Y320U in the upper left half in the row direction are provided.
Is supplied with a driving voltage from the driver IC 33C, and a driving voltage is supplied from the driver IC 33D to the column electrodes Y321U to Y640U in the upper right half in the row direction. Further, the driving voltage is supplied from the driver IC 33E to the lower left half column electrodes Y1D to Y320D in the row direction, and the driver IC is applied to the lower right half column electrodes Y321D to Y640D in the row direction.
A drive voltage is supplied from 33F.

Accordingly, the voltage drop (distribution) from each feeding point to each electrode end can be equalized, so that the signal voltage applied to the pixel at the center of the display screen and the upper left and lower left pixels The waveforms are equal, and the signal voltage waveform applied to the pixel at the center of the display screen and the pixels at the upper right and lower right ends are equal. From this, between the row electrode X240 and the row electrode X241, which is a break portion of the column electrode,
The column electrodes Y1U-
The display characteristics of Y640U and the column electrodes Y1D to Y640D can be made equal. Thereby, the display uniformity of the flat panel display 300 can be improved as compared with the conventional method.

(4) Application Example FIGS. 9A and 9B are conceptual diagrams viewed from the front comparing a conventional large-sized flat display panel with the large-sized flat display panel of the present invention. In this embodiment, a large-sized flat display panel (hereinafter referred to as a tiling display) in which the above-described flat display devices 100, 200, 300, and the like are laid in a tile shape is configured. Then, the conventional method and the present invention are compared.

A conventional tiling display 400 shown in FIG. 9A is a two-dimensionally tiled plurality of flat display devices 10 shown in FIG. In FIG. 9A, the flat panel display devices 10A, 10B, 10C
Are arranged in the horizontal direction, and the flat panel display devices 10D, 10E, 10F,... Are arranged in the vertical direction so as to be adjacent thereto. For this reason, in the horizontal direction, there is no continuity in the luminance of the pixel at the joint portion between the flat display device 10A and the flat display device 10B. In the vertical direction, the flat display device 10A
Then, the continuity is lost in the luminance of the pixel at the joint portion of the flat panel display 10D. Therefore, luminance unevenness occurs as a whole, and the display quality of the tiling display 400 is deteriorated.

On the other hand, in the tiling display 500 of the present invention shown in FIG. 9B, the above-described flat display device 100, 200 or 300 is laid in a tile shape. In FIG. 9B, the flat panel display devices 100A, 10A
0B, 100C,... Are arranged in the horizontal direction, and the flat display devices 100D, 10C,
0E, 100F... Are arranged.

In the method of the present invention, each flat display device 10
Since the display characteristics of 0A to 100F... Can be equalized, a seamless large-screen and high-resolution display with no noticeable seam can be performed without causing luminance unevenness unlike the conventional method.

In this embodiment, the case where the organic EL element is used for the light emitting thin film member has been described. However, the present invention is not limited to this, and similar effects can be obtained when the inorganic EL element is used. At that time, a stacked type of SrS: Ce / ZnS: Mn, or SrS: Ce, Eu is used for the inorganic EL element.

[0070]

As described above, according to the present invention,
N arranged in a row direction on one surface of the plate-shaped light emitting thin film member
Each of the stripe-shaped first electrodes in the row and the m-th stripe-shaped second electrodes arranged in the column direction on the other surface is provided with a feeding point substantially at the center, and driven from the feeding point. It supplies voltage.

With this configuration, the signal voltage waveforms applied to the pixels at the left, right, upper and lower ends of the display screen become equal at both ends, upper and lower ends of the screen, and gradation and color reproduction at the left, right, upper and lower ends of the display screen are achieved. It is possible to equalize display characteristics such as characteristics.

The present invention is very suitable when applied to a large-sized flat display in which an organic thin-film EL panel or an electroluminescent panel is laid in a tile shape.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram illustrating a configuration example of a flat panel display device 100 according to a first embodiment, viewed from the back.

FIG. 2 is a perspective view showing a configuration example of a cross section of an organic EL cell of the flat display device 100.

FIG. 3 is a sectional view showing an operation example of the organic EL cell.

FIG. 4 is a cross-sectional view illustrating an example of supplying a driving voltage of the flat panel display device 100.

FIG. 5 is a diagram showing a circuit example of one line of a row electrode of the flat panel display device 100.

FIG. 6 is a conceptual diagram viewed from the back showing a configuration example of a flat display device 200 as a second embodiment.

FIG. 7 is a cross-sectional view showing an example of supplying a driving voltage to the flat panel display 200.

FIG. 8 is a conceptual diagram illustrating a configuration example of a flat panel display device 300 according to a third embodiment, viewed from the back.

FIG. 9A shows a conventional tiling display 40;
0 is a top view showing a configuration example of B, and B is a top view showing a configuration example of a tiling display 500 according to the present invention.

FIG. 10 is a conceptual diagram showing a configuration example of a conventional flat panel display device 10 viewed from the back.

11 is a diagram showing a circuit example of one line of a row electrode of the flat panel display 10. FIG.

[Explanation of symbols]

11, 21, 31,..., Glass substrate, 12... White light emitting EL element, 13A to 13D, 24A to 24D, 32A to
32F: printed circuit board, 14A to 14D, 25A to
25D, 33A to 33F: Driver IC, 15A to
15D, 26A to 26D, 34A to 34F: Flexible wiring (substrate), 22, 23: Wiring, 40 ...
-Organic EL cell, 41-Column electrode, 42-Organic layer, 42A-Organic hole transport layer, 42B-Organic light-emitting layer, 42C-Organic electron transport layer, 43- Row electrodes, 100, 200, 300: flat display device, 4
00 ・ ・ ・ Tiling display

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G09G 3/30 G09G 3/30 J H05B 33/14 H05B 33/14 A (72) Inventor Yoshinari Matsuda Tokyo 6-35 Kita-Shinagawa, Shinagawa-ku Sony Corporation (72) Inventor Atsushi Matsuzaki 6-7-35 Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation (72) Inventor Yoshio Suzuki Shinagawa-ku, Tokyo 6-7-35 Kita Shinagawa F-term (reference) in Sony Corporation 2H091 FA44Y FA50Y GA03 GA11 LA16 LA18 MA03 3K007 AB00 AB02 AB04 AB05 AB17 BA06 BB07 CA01 CB01 CC05 DA01 DA05 DB01 DB02 DB03 DC02 EB00 FA02 5C080 AA06 BB06 CC03 DD05 EE29 EE30 FF12 GG12 JJ02 JJ03 JJ04 JJ06 5C094 AA04 AA13 AA14 AA48 AA53 AA55 BA27 CA19 CA24 DB01 DB02 DB05 EA05 EA10 EB02 FA01 GB01

Claims (7)

[Claims] 1. A substrate, n rows of striped first electrodes disposed in a row direction on the substrate, a plate-shaped light emitting thin film member disposed over the entire surface of the first electrode, An m-row stripe-shaped second electrode disposed on the light-emitting thin film member in a column direction orthogonal to the electrodes, and a power supply point is provided at a substantially central portion of any of the first and second electrodes. And a driving voltage is supplied from the feeding point. 2. The method according to claim 1, wherein the number of the first electrodes in the n rows is divided into p in the row direction of the substrate, and the number of the second electrodes in the m columns is divided by q in the column direction of the substrate. A first to a p-th drive circuit for supplying a drive voltage to each group of electrodes obtained by dividing the number of the first electrodes by p; and a group of electrodes obtained by dividing the number of the second electrodes by q. 2. The flat display device according to claim 1, further comprising: first to qth driving circuits for supplying a driving voltage. 3. A first wiring which is electrically connected in parallel with each of the first electrodes in the n rows, and one end of an electrode wiring formed in a loop by the first electrode and the first wiring. 2. A power supply point is provided at the power supply point, and a drive voltage is supplied from the power supply point.
The flat panel display according to the above. 4. A second wiring electrically connected in parallel with each of the m columns of second electrodes, one end of an electrode wiring formed in a loop by the second electrode and the second wiring. 2. A power supply point is provided at the power supply point, and a drive voltage is supplied from the power supply point.
The flat panel display according to the above. 5. The n rows of first electrodes themselves are divided by q in the column direction of the substrate, the number of n rows of first electrodes is divided by p in the row direction of the substrate, and the m columns are divided by p. In the case where the number of the second electrodes is divided by q in the column direction of the substrate and used, the number of the first electrodes divided by q in the column direction of the substrate is driven to each electrode group divided into p. First to supply voltage
To q-th drive circuit, and q-th drive circuits for supplying a drive voltage to each group of electrodes obtained by dividing the number of the second electrodes by q. Item 2. The flat panel display according to item 1. 6. The flat display device according to claim 1, wherein the light emitting thin film member is an organic EL element or an inorganic EL element. 7. The flat display device according to claim 6, wherein the organic EL element and the inorganic EL element are white light emitting EL elements.