JP2655434B2 - Matrix liquid crystal display - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a matrix liquid crystal display, and more particularly to a liquid crystal display having a heater for compensating display characteristics.

[Conventional technology]

2. Description of the Related Art A conventional dot matrix liquid crystal display is becoming an active matrix type in which a switching element such as a thin film transistor (TFT) is provided so that display characteristics such as a display capacity and a viewing angle are significantly improved. Part 1
FIG. 6 shows a schematic diagram of a partially enlarged cross section of the example. TFT substrate 6
A TFT 69 is provided on 0, and a display electrode 68 for each display dot connected to the source electrode of the TFT 69 is provided. A color filter 62 is provided on one color filter substrate 61 corresponding to the display dot pitch, and a counter electrode 64 is provided on the entire display surface. By the way, black filters 63 are provided in a matrix for the purpose of improving color separation at the boundary of different colors of the color filter 62 and improving display characteristics. An alignment film 65 is provided on each of the TFT substrate 60 and the color filter substrate 61 and bonded to each other, a liquid crystal 67 is injected, and a polarizing plate 66 is bonded to the outside.

[Problems to be solved by the invention]

The above-mentioned conventional matrix liquid crystal display has excellent display characteristics because it has an active element and a black matrix, but has a problem that the temperature range exhibiting such excellent characteristics is narrow. In this case, there is an essential problem that the response speed is remarkably deteriorated at a low temperature. It is well known that temperature compensation should be performed for that purpose. However, unlike a conventional reflective matrix liquid crystal display, it is inevitable to use a transmissive type in order to perform color display. Like heater panel
Inserting the 70 between the liquid crystal display module 71 and the backlight 72 has a drawback that the effective use of light is hindered.

[Means for solving the problem]

The present invention relates to a matrix liquid crystal display having a structure in which a TFT substrate provided with a TFT and a color filter substrate provided with a color filter are laminated with a liquid crystal interposed therebetween, and the color filter substrate has a surface opposite to the color filter. It is characterized in that a matrix heater of a metal film is provided.
The matrix liquid crystal display of the present invention is characterized in that the heater bus line of the matrix heater is covered with a black oxide film or a black resin film.

〔Example〕

Next, the present invention will be described with reference to the drawings. First
FIG. 1 is a plan view for explaining a matrix heater on a color filter substrate of a matrix liquid crystal display according to a first embodiment of the present invention. The matrix heater 10 is provided in a matrix by a Y bus 13 and an X bus 14 over the entire display surface, and heater terminals 11 are provided at four corners. Y bus 13
The X bus 14 is provided intermittently with the scanning lines as the active matrix wiring so that the center of the display surface becomes dense and the terminal side becomes coarser. They are provided while maintaining the overlapping positional relationship. The matrix heater 10 is provided in a heater bus 20 shape on the opposite surface of the color filter substrate 21 on which the color filter 22 is provided as shown in the sectional view of FIG. The heater bus 20 is provided at the boundary between different colors of the color filter 22 with a width W equal to or larger than the gap width between the display electrodes of the TFT substrate. or,
As shown in FIG. 3, in the matrix liquid crystal display of the present invention, heater terminals 27 are provided at four corners of the color filter substrate 21, and a polarizing plate 26 is provided so as to cover the display surface and the matrix heater 23. .

As the material of the matrix heater, the above-mentioned Cr and NiCr are preferable in terms of good adhesion to glass and easy design of electric resistance, but Ti, Mo, W and the like can also be used. When the film thickness is 1500 ° or more, a light shielding effect as a black matrix for performing color separation can be achieved. The matrix heater is coarse and dense between the center of the display surface and the terminals,
The current network is also controlled as input / output of two terminals among the four terminals, so that even if the line resistance is the same, the calorific value becomes uniform with respect to the surface. In addition, the Y bus in the signal line direction, in which color separation due to leakage light or the like is difficult, is provided in the entire area. can do. Since the heater terminals are provided at the four corners, there is no effect on the terminal arrangement for display. Further, since the matrix heater is provided in a positional relationship where the conventional black matrix should be provided, the heater does not cause deterioration in light use efficiency. Further, since the matrix heater is provided on the side of the color filter substrate opposite to the color filter, the temperature of the surface for heating the liquid crystal is alleviated by the thickness of the color filter substrate, so that there is an advantage that the temperature becomes more uniform. In addition, since the heater and the color filter do not come into direct contact with each other, deterioration of the color filter due to heat generation can be prevented.

By adjusting the voltage applied to the matrix heater as described above, when the temperature of the liquid crystal is no heater, -20
Even in an environment where the temperature changes from 30 ° C. to 30 ° C., the temperature can be adjusted to 10 ° C. to 30 ° C., and deterioration of the display response speed and the like can be prevented.

Next, a second embodiment of the present invention will be described with reference to the drawings. A matrix heater is provided similarly to the first embodiment shown in FIGS. However, as shown in FIGS. 2 and 3, when the matrix heater shown in FIG. 1 is patterned before the liquid crystal display is assembled, it has a structure obtained by adding a process as follows.
That is, as shown in FIG. 4, anodic oxidation treatment or the like is performed except for the contact portion 43 of the heater terminal 44, and FIG.
The black oxide film 46 was provided on the surface of the heater bath 45 as shown in FIG. Alternatively, a black resin film 47 such as an emulsion is provided on the heater metal, and a laminated structure as shown in FIG. 5B is obtained simultaneously with the heater patterning.

The liquid crystal display of this embodiment having a matrix heater provided with the black oxide film 46 and the black resin film 47 has the following features in addition to the advantages described in the first embodiment. . In the case of the first embodiment, the heater bus line is a metal white color, and when the display is visually observed, the whiteness is biased to the display characteristics and causes deterioration of contrast and the like. The effect could be eliminated by blackening.

[Effects of the Invention] As described above, according to the present invention, by incorporating a heater, the temperature can be compensated and an excellent display performance can be obtained even in a low temperature environment. Further, in the present invention, since the heater is formed in a matrix, the heater is also used as a black matrix, and the light use efficiency does not decrease. Further, the matrix heater of the present invention has the effect of making the temperature distribution uniform by providing the density. The matrix heater of the present invention has terminals at the four corners of the display surface, and therefore has little effect on the display drive terminals. Further, since the heater is provided on the side of the color filter substrate opposite to the side where the color filter is provided, there is an effect that the temperature can be made uniform and the color filter can be prevented from being deteriorated. Further, since the heater is covered with the polarizing plate, the life of the heater can be extended. Furthermore, since the heater surface is blackened, an increase in the white level of the display can be prevented, and there is an advantage that the deterioration of the contrast is prevented.

[Brief description of the drawings]

FIG. 1 is a plan view of a matrix heater portion on a color filter substrate in the matrix liquid crystal display of the first embodiment of the present invention, FIG. 2 is a partial cross-sectional view of the color filter substrate of the first embodiment, FIG. 3 is a top view of a matrix liquid crystal display, FIG. 4 is an enlarged view of a part of a color filter substrate for explaining a second embodiment of the present invention, and FIGS. 5 (a) and 5 (b) are heaters. FIG. 6 is a cross-sectional view showing a structure of a bus line, FIG. 6 is a cross-sectional view of a part of a conventional matrix liquid crystal display, and FIG. 7 is a diagram schematically illustrating a setup of a conventional liquid crystal display with a built-in heater. 10, 23 ... matrix heater, 11, 27, 44 ... heater terminal, 13 ... Y bus, 14 ... X bus, 20, 45 ... heater bus, 21, 41, 61 ... color filter substrate, 22, 62: color filter, 24, 64: counter electrode, 25, 65: alignment film, 2
6,66 …… Polarizer, 28,60… TFT substrate, 43 …… Contact part, 46 …… Oxide film, 47 …… Black resin film, 63 …… Black filter, 67 …… Liquid crystal, 68 …… Display Electrodes, 69…
... TFT, 70 ... heater panel, 71 ... liquid crystal display module, 72 ... backlight.

Claims (3)

(57) [Claims] In a matrix liquid crystal display having a structure in which liquid crystal is sandwiched between two substrates, a metal film is formed on the display substrate in a positional relationship overlapping with a color boundary of a color filter or an active matrix wiring. A matrix liquid crystal display, wherein the matrix-shaped heaters are provided with dense and dense mesh wirings which become coarse toward the outer periphery of the display surface in the center of the display surface. 2. The matrix liquid crystal display according to claim 1, wherein the heater bus line of the matrix heater is provided with a blackened film except for a contact portion of a terminal portion. 3. The matrix liquid crystal display according to claim 2, wherein the blackened film is formed of a black oxide film or a black resin film.