JPS6289932A - Liquid crystal display element - Google Patents

Abstract

PURPOSE:To improve the contrast on a panel by changing the width of timing electrodes, between which a gap of butting between data electrode groups is interposed, to form a light shielding part corresponding to the butting part between data electrode groups. CONSTITUTION:The interval between timing electrodes T51 and T52 is made narrower than the other intervals to shorten the width of a light shielding part. The electrode T52 is made wider than normal timing electrodes T50 and T53 to provide a light shielding part of the butting part between a U group and a D group. The electrode T51 is made narrower than normal electrodes T50 and T53, and the gap between electrodes T51 and T52 is shielded from light by a front end 102 of the U group. By such a method, a butting part 103 between the U group and the D group and a gap 104 between electrodes T51 and T52 are shielded from light.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the structure of a liquid crystal display element driven in a time-division matrix manner.

[Conventional technology]

Conventionally, when a liquid crystal display element driven by time division (1) IJyx is operated in a normally white state, no voltage is applied to the gaps between the pixels and light leaks, so the contrast of the liquid crystal cannot be maintained sufficiently. This resulted in a decrease in contrast.

Figure 4 A and B are twisted nematic liquid crystal displays.
The graph shows the electro-optical characteristics of the liquid crystal, with the axis showing the transmitted light intensity in the spatial plane and the horizontal axis showing the effective value of the voltage applied to the liquid crystal.

Figure 1A shows the electro-optical characteristics of a normally white liquid crystal display panel with high light transmittance when no voltage is applied.When the threshold voltage vTCL is exceeded, the light transmittance decreases from Ls, and VSAT
Exceeding LC will result in minimum LO. This Lo leaks from the gap between the pixel parts, and it depends on the gap design of the transparent electric fence, and the wider the gap, the worse the LO becomes.

Since the contrast of this .- and .-channel cannot exceed (Ls/Lo), no matter how high the contrast of each pixel can be made, the contrast of the .-P channel is low.

[Problem to be solved by the invention]

As an improvement to this problem, a light-shielding part corresponding to the gap between the opposing transparent electrodes was molded on or below the transparent electrodes. Figure 4B shows the characteristics of a normally white two-channel pixel when the gap between the pixels is blocked by a material that does not allow light to pass through, and the amount of light coming from the gap Lo is extremely small. Becomes a value. Therefore, the light transmittance of the entire gunnel is Ls
The contrast ratio decreases slightly from (Ls − Lo + Loo ), but the contrast ratio (Ls Lo + Loo )/
Loo rises dramatically.

However, when the data electrode group is divided into a plurality of parts and driven, it is necessary to provide a light shielding part for the abutting part of the data electrode group.
Using insulators requires difficult technology.

[Means for solving problems]

The width of the timing electrodes sandwiching the gap between the data electrode groups is changed to form a light-shielding portion corresponding to the butt portion of the data electrode groups.

Further, a notch is provided in the timing electrode to make the shape of the light leakage part in the electrode abutment area equal to the shape of the light leakage part in the non-butt area.

〔Example〕

FIG. 1 is a plan view showing a pixel portion of a liquid crystal display element using the present invention. The diagonal line downward to the left in Figure 1 indicates the data electrode (D
51-D53), (U51-53) The diagonal line at the upper left indicates the light shielding part of the timing electrode (T50-T53). The abutting portion of data electrodes U group and D group is between timing electrodes T51 and T52. 100 indicates the center of the pixel. The light-shielding part of a liquid crystal display element should be as narrow as possible so that both sides are bright, but it needs to be thick enough to take into account defects and misalignment during the manufacturing process.

The distance between the timing electrodes T51 and T52 is narrower than the other intervals, thereby reducing the width of the light shielding portion. T52 is made wider than the width of the normal timing electrode T50T53, and a light shielding portion is provided for the light shielding portions of the U group and the D group. Also, T51 is a normal T
It is narrower than 50T53. The space between T51 and T52 is shielded from light by the tip 102 of the U group. In the above method
Abutment part 103 between group and D group, between T51 and T52 1
04 is shielded from light.

FIG. 2 shows another embodiment of the invention, which has a notch 200 compared to the embodiment shown in FIG. In Figure 1, the U group and D
The light leakage 105 at the abutting part of the group is a normal light leakage part 10
T51.4 because it is smaller than T51. T52 looks black, but this can be solved by adding a cut 200.

FIG. 3 shows a conventional example in which a portion 301 that meets the data electrode group is not shielded from light and a white line is visible.

By changing the width of the timing electrode and shielding the projecting portion of the data electrode group from light as described above, uniform light shielding can be applied to a liquid crystal display element using a plurality of data electrode groups. This makes it possible to use light-shielding materials that can be mass-produced, such as Cr film and N1-P film, and to obtain a high-quality liquid crystal display element with high contrast.

FIG. 5 shows a light shielding structure in a multiple matrix according to the present invention, in which the space between the data electrodes is shielded from light above the timing electrode 501, and the space between the timing electrodes is shielded from light above the data electrode 502.

[Brief explanation of drawings]

FIG. 1 is a plan view of a pixel portion showing an embodiment of the present invention, FIG. 2 is a plan view of a pixel portion showing an embodiment of the present invention, FIG. 3 is a plan view showing a conventional light shielding structure, and FIG. 4 A shows an electro-optical characteristic diagram of a conventional liquid crystal display element, and FIG. 4B shows an electro-optical characteristic diagram of a liquid crystal display element subjected to light shielding treatment. FIG. 5 is a plan view showing a liquid crystal display element in which the multi-M-7 tox of the present invention is provided with a light-shielding structure. U51-U53 Data electrode group D51-D53 Data electrode group T2O-T53 Timing electrode group 200 Indicating cut/fffi 1,7115b 2-4-m, A. 4-Fig. Relationship Patent applicant address 2-1-1 Nishi-Shinjuku, Shinjuku-ku, Tokyo Telephone (03)
) 342-1231 January 28, 1986 5, subject to amendment

Claims (3)

[Claims] (1) In a matrix type liquid crystal display element, which has a structure in which two electrode plates with a plurality of transparent electrodes formed on an insulating substrate are arranged facing each other and a liquid crystal material is sandwiched between the electrode plates, the electrode gap between the opposing electrode plates A light shielding part is provided for the data electrode, and the data electrode is
A light shielding portion consisting of a first and second electrode group, in which the first and second data electrodes are arranged close to each other, and the width of the timing electrode located at the abutting portion of the first and second data electrodes is changed. What is claimed is: 1. A liquid crystal display device, characterized in that the abutting portions of data electrodes are shielded from light. (2) The timing electrode is provided with a notch in order to make the shape of the light leakage part in the electrode abutment area equal to the shape of the light leakage part in the non-abutment area. The liquid crystal display element according to item 1. (3) A liquid crystal display element with a multi-matrix pixel configuration, characterized in that a light-shielding portion is provided on opposing timing electrodes in order to block light from gaps between data-side electrode plates that occur due to the multi-pixel configuration. .