JPS60164792A - Display unit - 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 The present invention relates to a matrix display device using a liquid crystal sandwiched between a substrate having a plurality of row electrodes and a counter substrate having a plurality of column electrodes.

In conventional multi-injector (IJ) type display devices, as the number of row electrodes increases, the drive duty ratio decreases and the operating margin decreases. There is also the problem that p-swift occurs because each pixel is not independent, and as a means to solve this problem, it has been considered to insert a diode in series with the liquid crystal in each pixel to isolate it. FIG. 1 is a diagram showing the configuration of one pixel of a conventionally proposed display device. (1) is a row electrode, (2) is a column electrode, (8) is a diode, (5) is a one-pixel liquid crystal, and (8) is between display electrode (4) of (1) and (5). positioned. (1) and (2) are respectively formed on two opposing substrates, and (8) is integrated on the substrate on which (1) is formed. However, in this conventional display device, AC driving of the liquid crystal is difficult and there are problems with display quality.

An object of the present invention is to eliminate the above-mentioned drawbacks of the IJ type display device, and to provide a high-density information display device.

FIG. 1 In a matrix type display device, two diodes are arranged bidirectionally between a display electrode and a row electrode,
If the pixel configuration and drive signals in the display device are modified, an inverted potential can be applied between the display electrodes of the liquid crystal to perform AC driving. The present invention based on this idea performs display using a liquid crystal sandwiched between a substrate having a plurality of row electrodes and a counter substrate having a plurality of column electrodes. It has two electrodes forming a pair with diodes in opposite directions formed between the electrodes, and at least one of these electrodes also serves as a row electrode for pixels in an adjacent row. The gist is to apply a predetermined potential to one or both of the electrodes, and to apply a potential to both of the two electrodes during the non-selection period so that the diode is biased in the opposite direction with respect to the display electrode.

FIG. 2 is a diagram showing the configuration of one pixel in the display device of the present invention. In Fig. 2, the row electrode consists of a pair of two electrodes (1) and (6), and there is a diode (8) in opposite directions between the display electrode (→) and the display electrode (→). , (to) are formed, (1) , (8) , (4) , (6
) and (?) are formed on the same substrate.

FIG. 3 is a configuration diagram of pixels on two opposing substrates of the display device of the present invention, and FIG. 4 is a configuration diagram of pixels on a substrate having a plurality of row electrodes of the display device of the present invention. As shown in FIG. 3, the display device of the present invention has a plurality of row electrodes (
R1+ R1sR2: Rz', Rs; Rs', -
) and a plurality of column electrodes (XI: Xi', X
1;
The row electrodes in the row pixels (Pj, P star + PR+ -) are connected by mutually opposite diodes (n4; J, n star; l.

It has two electrodes (R2; R, /) forming a pair with which DA @ -++---) is formed, and these two electrodes form a pixel (Pf'+Pl+Pi+-m) in an adjacent row. −
). Regarding the configuration of column electrodes and pixels, as shown in FIG. 3, one column of pixels (Qt + Qr + Q
Display electrode (!Qt+ J + Qr + −) at the display electrode (!
"]1 in Fig. 4 Pj*"ki+Pr+Pf
+”4 + Pj + −−′−− display electrodes) are adjacent to each other (Qr
.

Qt) Two column electrodes with display electrodes in parallel (X,.

X1/) are configured to be connected to each other.

In this way, by connecting one adjacent row electrode having a common row electrode to another column electrode, independent data can be supplied to and held in the pixels.

As for the driving method, in Fig. 2, a predetermined potential is applied to one or both of the two row electrodes (1) and (6) during the pixel selection period, and the potential of (→ is used as that potential). A voltage between the pixel signal potential applied to the column electrode, that is, the display electrode (2) formed in ,
Apply a potential that biases (6) in the opposite direction to ω) and (η, and maintain the voltage between the display electrodes of the liquid crystal that was applied during the selection period. In order to perform AC drive, the voltage (1 )
, Apply a predetermined potential equal to or different from the previous one to the other or both of (6), and apply an inverted voltage between the pixel signal potential applied to (2) and the potential of (→ to the liquid crystal in the pixel. In addition, in the next non-selection period, 1 for (4)
), (6), (8), and (2) apply a potential that is biased in the opposite direction, and maintain the voltage between the display electrodes of the liquid crystal that is inverted from the voltage applied before during the selection period. In this way, display is achieved by controlling the arrangement of liquid crystal molecules and providing optical modulation. Various potentials are applied to the column electrodes during the non-selection period, but a capacitor is inserted between the display electrode (4) and the column electrode (2) to eliminate voltage attenuation during this period and obtain sufficient contrast. . (8)
is this capacity, that is, the display voltage storage capacity between the display electrodes of the liquid crystal. (8) is integrated on the same substrate as (1) and (61).

Therefore, as shown in FIGS. 3 and 4, a substrate having a plurality of row electrodes has a column electrode (X1
: xI' + "2: X2/ + x, j
-) are individually connected to a plurality of column electrodes (Y1; Y
1' l Yl j Yt' + YB j -), and in a certain pixel (Pt), the column electrode (X,' that is, Y,') and the display electrode connected to the display electrode (Q4) of the counter substrate A capacitance (at) is formed between the two. Here, the column electrodes are connected via a film-like flexible connector that is connected at the end of the substrate by thermocompression bonding.

FIG. 5 is a driving waveform diagram of the display device of the present invention shown in FIGS. 3 and 4. FIG. ■RI; vR1/, ■R2; vR2
'l vRl; VHst 1 ■RN; vRN
/Hasoresores Row electrode RI; RI'+ R1:
RV', '3;R8' + RN t The signal potential applied to RN', V; y/ is the parallel format Kl z
.

The pixel signal potential, vl, ■! applied to the pole x, ;x,'!
is the voltage between the display electrodes of the pixel Q: : Pt + QF; '4. Referring to the waveform shown by the solid line vRl; ), and in St, the other (R1'
) is applied with an equivalent predetermined potential (0), and the non-selection period H1
The potential at which the diode is biased in the opposite direction with respect to the display electrode at +J (-2■-α; 2■10α) (α≧0) is R,;
It is added to R,'. vxl; vXll is the pixel signal potential of -v-■, and it is a potential that is inverted by Sl, Hl and S, H7, and as seen in vl and vf, the AC original of the liquid crystal is achieved. There is. The display voltage storage capacity is the sum of the capacitance of the liquid crystal in the pixel, and is selected to be sufficiently larger than the parasitic capacitance of the diode, so that a stable liquid crystal drive voltage can be obtained as shown. If the waveform of the row electrode signal is a solid line plus a broken line, a predetermined potential (0) is applied to both of the two electrodes (R2; R1') at 'I+St', and the parasitic capacitance of the diode is Good display performance can be obtained by canceling out the direct current component of the potential change of the display electrodes caused by the above, and reducing or eliminating the display voltage storage capacity. Also, let the pixel signal potential applied to the column electrode be O-V, set a predetermined potential (■) to one (R1) or both of the two electrodes with s, and apply a predetermined potential (■) to the other (R1') or both with S. Applying a predetermined potential (0) different from before, Hl + J, R,; R
In addition to adding (-2V-α; 2v+α) to ,', apply a predetermined potential (V) to both with Sl, (0) with S, and add (-α to R,; R,' with Hl. −β, 2V+α+β) (β≧
0) can be made to add (-V-α-l, ■+α+β) with H8. In Figure 4, the electrode to which the capacitor is connected (
Y+; Yl' + Yt: Y! ' + Ys
; -) can be at a potential equal to or close to, typically within a range of 100 mV, synchronous with the potential change of the corresponding column electrode on the counter substrate, in which case this column electrode Column electrodes (x, j XI' + Xt;
, Xt'+X,; ------) and is formed on the substrate.

FIG. 6 shows a cross-sectional structural diagram of a substrate having a plurality of row electrodes of a display device of the present invention. (9), (10) are Cr, I
Electrodes made of Ji, Mo, Ta, etc., u; (1s; as
.

R4); α9; α0 is an amorphous semiconductor layer in which N layer;
(20) is an electrode (AI T Ni, etc.), and (I
s; (13); (121; (11); (
9) ,! =0 seagull; (LCD sti”ja; (14
); (1o) tttpxN junction type Y'x is formed, (19; (9) is the row electrode of R,; R, / in Figure 4. (9), between the α frames and (1o), (11 (17), (21) and (22) located between are SiOx,
Interlayer insulation film made of SimN*, SiOxNy, etc.
(24); (23) is the display electrode of the pixel of Pt::pi in Fig. 4 by rhxos, Snow, etc.;
5) is a liquid crystal alignment layer made of polyimide or the like, and (26) is a substrate made of glass or the like. (23) is connected to (1B), (24) is connected to (10) through (20), (II;
131; C10); (11); (9)
19; (10; Q5); (14); (10)
is a diode in the opposite direction due to its connection to the display electrode.

FIG. 7 shows a cross-sectional structural diagram of the same substrate as FIG. 6 in which a capacitor is formed between the column electrode and the display electrode. (27) is Al, Or
, Ni, Mo, Ta, etc., and a capacitance is formed by the insulating film (22) between it and the display electrode (23). (27), when a wide electrode width is required, the film thickness is controlled to achieve low sheet resistance.
etc. can be formed.

FIG. 8 shows a cross-sectional structural diagram of a substrate having a plurality of column electrodes of a display device of the present invention. (28) + (29) is A
Figure 3 x by l, Or, Ni, Mo, Ta, etc.
I'! xtO column electrodes, (30) are the display electrodes shown in Fig. 3 made of NZOS, 61nOi, etc. formed by the lift-off method, (31) are liquid crystal alignment treatment layers such as polyimide, and (32) are substrates such as glass. be. If necessary, the column electrodes can be made of the same material as the display electrodes, and the shape of (28) is formed in the same layer as the display electrode group including (30).

The PIN junction diode shown in Fig. 6 generates plasma C by glow discharge at a relatively low temperature by switching dopant gases such as PHs and B2Hs added to SiH4 gas.
Laminated by vD method, the insulating film is 81H*t NHx, C
Similarly, it is formed by a plasma OVD method using glow discharge at a relatively low temperature using a mixed gas such as ot. Of course, if an insulating substrate such as heat-resistant glass or ceramics is used, a polycrystalline silicon diode and an insulating film can be formed with an OVD film by thermal decomposition, and an impurity introduction method by ion implantation can be used.

The display device of the present invention is suitable for both a reflective type and a transmissive type, but in plan view, the P-N junction region of the diode is inside the electrodes (9), (1o), (19), By arranging the electrode at a sufficient distance (typically 10 μm or more) from the end of the electrode, light is blocked and good display quality that is independent of changes in external light can be maintained.

FIGS. 9 and 10 show other embodiments of the display device of the present invention, and correspond to FIGS. 3 and 4, respectively. 3 shows a configuration diagram of a pixel on a substrate having the same structure. The difference between FIG. 10 and FIG.
The row electrodes in (1) and diodes in opposite directions are arranged between the display electrodes indicated by the opening for each pixel (DF
: has two electrodes (R,; R,') forming a pair in which a FltID element; Fi + DR9---) is formed,
Among these two electrodes, one electrode (bird') also serves as the row electrode for the pixels in the adjacent row (P↑+ '': + P1+ ).The other electrode (R2) is (PF
+P+PR+--) row pixels and (PF, P number.

It is formed separately for the pixels in the row "31" and connected at the edge of the substrate.

FIGS. 11 and 12 show still other embodiments of the display device of the present invention, and correspond to FIGS. 3 and 4, respectively. 3 shows a configuration diagram of a pixel on a substrate having a 1. The difference between FIG. 12 and FIG. 4 is that the pixels (PI', Pg
, P Snow, -1111) The row electrodes in each pixel are connected with mutually opposite diodes (
DF;1! l! j, D#;g夛,pi;
P4 +-; "1 + P: +": +--
-~) also serve as row electrodes.

By the way, the display device of the present invention has the characteristics described below as a pixel configuration method and driving method, so that it can be made larger in area,
It can support larger display capacity.

That is, in a substrate on which a plurality of column electrodes are formed, the column electrodes are vertically separated so that the display area is divided into two in terms of a drive circuit, and the row electrodes of the opposing substrate are commonly driven in the separated areas.

Color filters are arranged on the same substrate, peripheral circuits consisting of data transfer and latches or switches are connected to pixel columns of the same color in the - row pixels, and multiple column electrode groups are simultaneously driven by peripheral circuits that are independent for each color. do.

For example, the column electrodes on the same substrate are divided into a plurality of groups, and peripheral circuits are independently connected to each group and driven simultaneously.

As explained above, the display device of the present invention solves the problems that were conventionally considered difficult with the matrix type by inserting diodes in the pixels and devising the pixel configuration method and drive signal.

Since the liquid crystal is driven in a highly static manner, excellent display quality with a high contrast ratio is achieved, and it is used as information display devices in various fields.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of one pixel of a conventional display device. FIG. 2 is a configuration diagram of one pixel in the display device of the present invention. FIG. 3 is a configuration diagram of pixels on two opposing substrates of the display device of the present invention. FIG. 4 is a configuration diagram of pixels on a substrate having a number of rows v camellias in the display device of the present invention. Figure 5 is a drive waveform diagram of the display device of the present invention shown in Figures 3 and 4. FIG. 6 is a cross-sectional structural diagram of a substrate having a plurality of row electrodes of a display device of the present invention. FIG. 7 is a cross-sectional structural diagram of the same substrate as FIG. 6 including a capacitor. FIG. 8 is a cross-sectional structural diagram of a substrate having a plurality of column electrodes of a display device of the present invention. FIG. 9 is a configuration diagram of pixels on two opposing substrates of another embodiment of the display device of the present invention. The GL diagram is a configuration diagram of pixels on a substrate having a plurality of row electrodes in another embodiment of the display device of the present invention. FIG. 11 is a configuration diagram of pixels on two opposing substrates of another embodiment of the display device of the present invention. FIG. 12 is a configuration diagram of pixels on a substrate having a plurality of row electrodes in another embodiment of the display device of the present invention. RI: R1's R1J R1' + R8j
H, / -- Two electrodes that form a pair of single row electrodes. x,; t lq 2 years old, 3 years old, 4 voices, t) 1 years old, 2 years old, ノθ drunkenness // ) Threshold t72 years old

Claims (1)

[Claims] (1) Display is performed using a liquid crystal sandwiched between a substrate having a plurality of row electrodes and a counter substrate having a plurality of column electrodes, and the row electrodes in the pixels in the - row are arranged for each pixel. It is characterized in that it has two paired electrodes in which diodes in opposite directions are formed between them and the display electrode, and at least one of these electrodes also serves as a row electrode for pixels in an adjacent row. Display device. (O) Display electrodes in one row of pixels on a substrate having a plurality of column electrodes are connected to two parallel column electrodes so that adjacent display electrodes are connected to two parallel column electrodes via row electrodes of a counter substrate having a plurality of row electrodes. (8) A substrate having a plurality of row electrodes has a plurality of column electrodes each connected to a column electrode of a counter substrate. Claims 1 and 2, wherein a capacitance is formed between the column electrode and the display electrode connected to the display electrode of the counter substrate. Display device.