JPS63183484A - Matrix type 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] [Industrial Application Field] This invention has a matrix type wiring consisting of a plurality of gate electrode lines, a plurality of source electrode lines, etc., and a TF at the intersection thereof.
Regarding matrix type display devices comprising a TFT array substrate comprising active elements such as TFTs, pixel electrodes, etc., and a display material such as a liquid crystal sandwiched between the counter electrode substrate and the like, redundancy is particularly provided. It is related to.

[Prior Art J] An active matrix display device has been known as a technique for improving the amount of display information and resolution of a matrix display device, for example, as disclosed in Japanese Patent Laid-Open No. 59-5228.

As shown in FIG. 5 and FIG. 6, whose equivalent circuit and cross-sectional view are and an active collector having a switch function such as T P T (4) at each intersection of both electrode lines (L) and (2), a drain current m (3), a pixel electrode (5), and a capacitor. (6) TFT array (8
) and a counter electrode substrate (11) having a counter electrode (10) facing this TFT array (8)K, a display material such as a liquid crystal (7) is sandwiched between the structure. It has become.

FIG. 7 is a diagram for explaining the configuration of a conventional TFT array (8), and partially shows the pixel configuration of the display section. The basic unit of display is a matrix of electrode wiring consisting of a wooden gate electrode line (1), a source electrode line (2), TPT (4), and a pixel type #! , (5), etc.

[Problems to be solved by the invention] TF used in conventional matrix display device (12)
The T-array (8) is configured as described above, and there is no disconnection in each electrode wiring such as the source electrode line (2), gate electrode line (1), etc., and gate electrode line (1) which is three-dimensionally wired in a matrix.
), disconnections and short-circuits in the surface wiring of the matrix wiring consisting of the source electrode line (2), especially at intersections between both electrode lines (1) and (2), and disconnections, short-circuits, and poor characteristics of the TFT (4); There was no redundancy for various defects due to etc.

By the way, the above-mentioned matrix type display device is formed so that the size of the unit pixel shown in the figure is small, for example, from about 50 μm to about 1 μm or less, because it is used as a man-machine interface in, for example, a computer terminal display device. Although the required number t/'i of pixels depends on the screen size of the display device, its use, etc., normally several thousand to one million pixels are required.

In addition, due to the demand for larger display screens and higher resolution, it has become important to reduce the size of the unit pixel mentioned above and to increase the number of pixels.

Coupled with the miniaturization and enlargement of pixels, it is necessary to manufacture them with no defects or with a low defect density. As mentioned above, T used in a conventional matrix type display device
The li'T array (8) includes, for example, a source electrode line (2).
disconnection, and disconnection of surface wiring that occurs frequently at the intersection of matrix wiring consisting of gate electrode line (1) and source electrode line (2),
A matrix type display device with a function of correcting short circuit defects, TFT (4) defects or characteristic defects, etc., that is, there is no redundancy, and as a result, there are many defects, and a high manufacturing yield and good characteristics. The problem was that it was difficult to obtain.

This invention was made in order to eliminate the problems of the conventional ones as mentioned above. The purpose is to provide a display device.

[Means for Solving Problems J] A matrix type display device according to the present invention has a matrix type wiring including a plurality of gate electrode lines and a plurality of source electrode lines intersecting these gate electrode lines, and has the above-mentioned A Tli'T array is provided with a thin film transistor (hereinafter referred to as TFT) having non-linear characteristics, a switch element, and a pixel electrode arranged at the intersection, and a display material is placed between the TFT array and a counter electrode substrate facing the opposite side. The above TFT array,
The two TFTs are arranged in one pixel electrode, and the two source electrode lines are connected to each TF'l'.

[Function] In this invention, two TFTs are arranged in one pixel electrode, and each of these TFTKs is connected to a source electrode line, so a defect such as a disconnection may occur in one TFT or source electrode line. But the other Tli'T or source electrode line? It is now possible to supply signals to the pixel electrode using
A reduction in pixel defects can be achieved.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, l(n-1) to l(n+1) are gate electric currents mW, 2(n-1) to 2(n+1)# are first source electrode lines, and 20(n-1) to 20(n+1) is the second source electrode line, (4) is the first 'I'FT% (40
) indicates the second TFT.

In this way, the 'I'FT array according to this embodiment has two T P T (4), (4
0) and two source electrode lines 2 (n-1) to 2 (n+1), 20 wired on both sides of the pixel electrode (5).
(n-1) ~20(n+1) for each T]i'T
It has a structure connected to (4) and (40). Note that the configurations of display materials, counter electrodes, etc. are the same as those of the conventional one shown in FIG.

In the configuration as described above, for example, the n-th gate electrode line 1 (n) and the source electrode line 2 (
6) If the TFT (4) becomes defective in the pixel at the intersection of
From the second T P T (40) connected to
A signal is supplied to the pixel electrode (5).

In addition, even if the source electrode line 2 (6) has a defect such as a disconnection, the second TPT (40) connected to the gate electrode line 1 (n) and the source electrode line 2 (40) A signal can be supplied to the pixel electrode (5). As described above, according to this embodiment, it is possible to supply the original correct video signal for defects such as disconnection of TFff' (4) and the source electrode line (2), and 'l' with a low defect density can be supplied. 'The FT array can be obtained at a high manufacturing yield and has low pixel defects, making it extremely effective in increasing the screen size and resolution of matrix display devices.

FIG. 2 is a block diagram showing a part of a TFT array according to another embodiment of the present invention, and in this example, the same pixel electrodes (5
) for two T P T (4), (40) #-t,
The first T P T (4) is arranged at a diagonal position of the pixel electrode (5). That is, the first T P T (4) is arranged between, for example, the n-th gate electrode line 1 (n) and the n-th first source electrode line 2. (b), the second T F T (40), the n + 1st gate electrode line 1 (n+1), and the nth second source electrode line 20 (b). For example, each nth gate electrode line 1
(n), and if T17'T(4) becomes defective in the pixel at the intersection of source electrode lines 2(n) and 20(n), and source electrode line 2(b) has a defect such as disconnection. If this occurs, gate electrode line 1 (n+1
) and the second T P connected to the source electrode line 20 (b)
A signal is supplied from T (40). Furthermore, in this example, even if the gate electrode line 1 (n) is defective due to disconnection or the like, the second TP T (40) connected to the gate electrode line 1 (n+1) and the source electrode line 2o (b) There is an effect that belief can provide.

FIGS. 3 and 4 are block diagrams showing parts of Tli'T arrays according to other embodiments of the present invention. In the embodiments shown in FIGS. 1 and 2, respectively, the same pixel electrodes ( 5), two T F T (4), (
40) are connected at their ends to form a common wiring. By common wiring in this way, source electrode lines 2 (n l) to 2 (
The number of lead-out wires (n+1) can be halved, and the number of connections between the matrix display device and external circuits can be reduced.

In addition, in the above embodiment, the case where the display material (7) is a liquid crystal was mainly explained, but for example, it may be an electroluminescent display material, an electrochromic display material, or other display material, and the same effects as in the above embodiment may be obtained. has.

[Effects of the Invention] As described above, according to the present invention, there is provided a matrix wiring including a plurality of gate electrode lines and a plurality of source electrode lines that intersect with these gate electrode lines, and there is a In a TFT array display device configured by arranging thin film transistors (hereinafter referred to as TFTs) having linear characteristics, switch elements, and pixel electrodes, the TFT array has the following features:
Since it has a structure in which two TFI's are arranged on one pixel electrode and two source electrode lines are connected to each TFT, even if defects such as disconnection occur in the TFT or source electrode line. It is possible to supply signals to the pixel electrodes, and there is an effect that a matrix type display device with few display defects and good and uniform display performance can be obtained.

(lO)

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a part of a TF'l' array according to one embodiment of the invention, and FIGS. 2 to 4 each show a part of a TFT array according to other embodiments of the invention. Diagram,
Fig. 5 is an equivalent circuit diagram of a conventional matrix type display device, Fig. 6 is a sectional view of the conventional matrix type display device shown in Fig. 5, and Fig. 7 is an equivalent circuit diagram of the conventional matrix type display device shown in Fig. 5. It is a block diagram which shows a part of TFT array used. In the figure, (1), l (n-1) ~ l (n+2
) is the Gate Doshin Sake line, (2), 2 (n 1) ~
2(n+1), 20(n1) to 20(n+1)
u source electrode lines, (4) and (40) are T P T,
(5) is the pixel electrode, (7) is the display material, (9) is T F
'T array substrate, (10) is a counter electrode, and (11) is a counter electrode substrate. Note that the same reference numerals in each figure indicate the same or corresponding parts. Representative Masuo Oiwa Fig. 1 1 (nt) -, -1 (n + r) Gate electrode II line 4.40: T7”T 59 Pixel electrode Fig. 2 Fig. 3 Fig. 4 Fig. 5 Figure 6

Claims (5)

[Claims] (1) A thin film transistor (hereinafter referred to as TFT)/switch that has matrix-type wiring consisting of a plurality of gate electrode lines and a plurality of source electrode lines that intersect with these gate electrode lines, and has nonlinear characteristics at the intersections. It is equipped with a TFT array configured by arranging elements and pixel electrodes.
In a matrix display device having a configuration in which a display material is sandwiched between an FT array and a counter electrode substrate facing each other, the T
The FT array includes two TFTs on one pixel electrode.
and connect the two source electrode lines to each TFT.
A matrix type display device characterized by having a structure connected to. (2) The matrix type display device according to claim 1, wherein the display material is liquid crystal. (3) The matrix type display according to claim 1 or 2, wherein the two source electrode lines connected to the two TFTs for the same pixel electrode are wired on both sides of the pixel electrode. Device. (4) Any of claims 1 to 3, wherein the two source electrode lines connected to the two TFTs for the same pixel electrode are connected at their ends to form a common wiring. The matrix type display device described in . (5) The matrix display device according to any one of claims 1 to 4, wherein the two TFTs for the same pixel electrode are arranged at diagonal positions of the pixel electrode.