JPH063639A - Manufacture of projection type color liquid crystal display device - Google Patents

Abstract

PURPOSE:To provide a projection type color liquid crystal display device having light weight and compact size. CONSTITUTION:In a liquid crystal display device, a mosaic type color filter 4 is laid on a thin film transistor(TFT) type liquid crystal panel 1 having a TFT connected to each of red, green and blue picture elements in such a way as corresponding to each element. Also, a planer lens array(PLA) with a lens array formed in such a way as corresponding to each picture element is laid on the filter 4, and a light source 6 is provided on the PLA, with a projection lens 8 fitted to the liquid crystal panel 1 at the opposite side of the light source 6. Regarding the liquid crystal display device so constituted, the PLA is processed with a silane compound and, then, the mosaic type color filter 4 is formed, as a method for manufacturing a single panel projection type color liquid crystal display device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a projection type color liquid crystal display device. More specifically, a transmissive matrix type liquid crystal display panel, a planar lens array (PLA) used as a means for condensing incident light on each picture element to make the display bright, and a color filter as a coloring means are provided. The present invention relates to a method for manufacturing an integrated single-panel type projection type color liquid crystal display device.

[0002]

2. Description of the Related Art A projection type color liquid crystal display device is a display device which projects light from the back of a liquid crystal panel to project a color image on a screen. This liquid crystal display device has a panel structure of 1
There are two systems, a single panel system and a three panel system. In the single panel system, red, green and blue mosaic color filters are provided so as to correspond to each picture element of the liquid crystal panel. The single-panel method is superior to the three-panel method in terms of downsizing, weight saving, and manufacturing cost reduction, but when performing color display in the single-panel method, the same resolution as that of the three-panel method is obtained. In order to 1
It is necessary to triple the number of picture elements to be formed on one panel,
Each picture element must be very small. Along with this, the ratio of the contributing region (aperture ratio) becomes small, and the problem arises that the display screen becomes dark even if the same light source is used. Therefore, as a solution to the above problem, P
A technique of providing a light collecting means such as LA in a picture display device and collecting illumination light on a picture element portion to improve the brightness of a display screen is described below.
It is disclosed in JP-A-60-165621-4.

Further, in the above-mentioned single-panel system, there are two systems, that is, a color filter internal system in which a color filter is provided on the side in contact with the liquid crystal and a color filter external system in which the color filter is provided outside the liquid crystal panel. Here, in the former case, the liquid crystal retention rate decreases due to the elution of ionic impurities from the color filter material, and
When driving by using an active element such as FT), there is a problem that it is difficult to obtain a good display contrast. On the other hand, in the latter, since the color filter layer is located outside the liquid crystal panel, there is no problem of the liquid crystal retention rate lowering due to the color filter, and therefore the color filter external mounting method has an advantage of being easier to manufacture.

From the viewpoint of ease of manufacturing a liquid crystal panel, a color filter external attachment system has been adopted so far, and FIG. 5 shows a panel configuration of the galler filter external attachment system. The color filter 4 formed on the PLA 2 is bonded to the liquid crystal panel 1 with high precision by using an ultraviolet curable adhesive 3 so as to correspond to each picture element of the liquid crystal panel. However, the adhesiveness between the PLA and the color filter, the adhesiveness between the color filter and the laminating resin, and the adhesiveness between the laminating resin and the liquid crystal panel are poor. In the reliability test, the PLA was peeled off from the liquid crystal panel.

[0005]

According to the present invention, a mosaic is provided on a TFT type liquid crystal panel in which a thin film transistor (TFT) is added to each picture element in correspondence with each of the red, green and blue picture elements of the liquid crystal display panel. -Shaped color filter, and a planar lens array (PLA) in which a lens array is formed corresponding to each picture element is provided thereon, a light source is provided on the PLA, and the liquid crystal panel on the opposite side of the light source is provided. In manufacturing a liquid crystal display device equipped with a projection lens, a method for manufacturing a single-panel type projection color liquid crystal display device characterized by forming a mosaic color filter after treating the surface of PLA with a silane compound. To do.

Further, as a preferable method for treating the silane compound of PLA, a method of treating the surface of the PLA with the silane compound or a silane compound is previously added to the mosaic color resist and the color resist is coated on the PLA. Provided are a method and a method of adding a silane compound into an adhesive for laminating a liquid crystal panel and PLA. Thin film transistors (TFTs) applied to this invention are those of ordinary P-type and N-type semiconductors, for example, "International Conference on Solid-State Devices and Materials" (Extended Abstracts of the 1991 I).
nternational Conference on Solid State Devices and
Materials, 1991, pp.608-610) are applied.

The TFT is provided on a substrate provided with a pixel electrode (1b), and an opposite substrate provided with a transparent electrode is provided opposite thereto (1a). Here, the materials of the transparent electrode and the pixel electrode are indium-tin oxide (I
TO), SnO, and the like, and ITO is preferably applied. Examples of the substrate material include glass, quartz and plastics, and glass and quartz are preferably used. Here, the transparent electrodes are formed by arranging a plurality of transparent electrodes in stripes so as to be parallel to each other. When the transparent electrodes are used as picture element electrodes, the picture element electrodes have a width of about 40 to 100 μm and an interval of about 10 to 20 μm.

The liquid crystal composition applied to the present invention is PCH
System, CCH system, ester system, pyrimidine system, and the like, and preferably, PCH system, CCH system, and pyrimidine system are applied. Here, the liquid crystal composition 13 is filled between the upper and lower substrates, and the thickness (d) thereof is determined by the design and configuration of the liquid crystal display device.
It is about μm, preferably 10 to 15 μm. This thickness is 5
If it is less than μm, the light scattering property when no voltage is applied is insufficient.
When the thickness is more than μm, the predetermined electric field strength for driving the liquid crystal is insufficient and sufficient transparency cannot be obtained when a voltage is applied, or the driving voltage becomes high. After the liquid crystal composition is filled, both ends are sealed with an adhesive of thermosetting sealing resin. Thus, the liquid crystal panel is manufactured.

Next, a color resist master is coated on a glass substrate with a color resist by a spinner or the like. As a kind of color resist, CG-2000 manufactured by Fuji Hunt Electronics is used as a green color resist.
Examples of the red color resist include CR-2000 manufactured by Fuji Hunt Electronics,
Examples of the blue color resist include CB-2000 manufactured by Fuji Hunt Electronics. The rotation condition of the spinner is 400 to 1000 rpm, preferably 500 to 700 rpm.

A coating agent such as polyvinyl alcohol (P
VA) is applied with a spinner or the like. At this time, the spinner is rotated at 300 to 700 rpm, preferably 450 to 550 rpm.
rpm. Further, after exposure and development, baking is performed to produce a color resist. Then, the glass substrate on which the color filter is formed is attached to the liquid crystal panel. Here, the bonding is performed with high precision so that the mosaic pattern of the color filter formed on the glass substrate and each picture element of the liquid crystal panel correspond to each other.

As an adhesive used for bonding, a transparent resin of ultraviolet curing or a combination of ultraviolet curing and heat curing is used. Examples of such adhesives include ThreeBond's ThreeBond 3000 series, Sony Chemical
Sony Loctite, Nippon Synthetic Chemical Co., Ltd., KKS Seeds, Nippon Loctite Co., Ltd. Loctite 363, Daikin Industries, Ltd. C1080, etc.
Loctite 363 manufactured by Daikin Industries, Ltd. and C1080 manufactured by Daikin Industries, Ltd. are preferably applied.

Then, a planar lens array (PLA) in which a lens array is formed is provided on the color filter corresponding to each picture element. The material of PLA is glass or quartz. Here, in order to adhere the PLA to the color filter and to improve the adhesiveness between the adhesive and the liquid crystal panel, a coupling agent is mixed in the laminating adhesive or the color filter.

Next, a coupling agent for improving the adhesiveness of the PLA, the color filter, the bonding resin, and the liquid crystal panel will be described. Examples of the coupling agent used in the present invention include a silane coupling agent and a titanium coupling agent. The silane coupling agent refers to a compound bonded through at least one reactive group of a tetravalent silicon atom. As a reactive group,
Examples thereof include an amino group, a vinyl group, an epoxyethyl group, an epoxyethylene group, a mercapto group, an alkoxy group, an alkyl group, an isocyanate group and an ammonium compound residue. Further, examples of the ammonium compound residue include a quaternary ammonium compound residue such as an octadecyldimethylammonium chloride residue. Further, as the linking group bonded to the silicon atom, an alkylene group having 1 to 5 carbon atoms such as an ethylene group, a propylene group, a trimethylene group, and a tetramethylene group, and a carbon number of 2 to 2 such as a trimethylenoxymethylene group. An alkyleneoxyalkylene group having 8 to 8 carbon atoms such as an alkyleneoxyalkylene group having 8 or trimethylenaminoethylene groups, or an alkyleneoxy having 2 to 5 carbon atoms such as an ethyleneoxycarbonyl group or a triethyleneoxycarbonyl group. Examples thereof include a carbonyl group. Other,
The silane coupling agent also includes a disilazane compound such as hexaalkyldisilazane.

As described above, among the above-mentioned silane coupling agents, those which generate silanol groups, for example, those which have at least one alkoxy group directly bonded to a silicon atom are used. Of these, particularly preferred are silane coupling agents that generate silanol groups and further have 1 to 2 epoxyethyl groups, mercapto groups, isocyanate groups, amino groups or vinyl groups. The silane coupling agent may be used alone or in combination of two or more. Specific examples of the silane coupling agent used in the present invention are shown below.

[0015]

[Chemical 1] In addition to the above silane coupling agent, the following general formula [I],
A titanium coupling agent represented by [II] can also be used.

[0016]

[Chemical 2] The following are specific examples of the titanium coupling agent.

[0017]

[Chemical 3] Next, the effect of the silane coupling agent will be described. An organic pigment such as phthalocyanine is uniformly dispersed in an acrylic binder resin in the color resist forming the color filter. On the other hand, it is used for PLA or liquid crystal panel. The reaction with the above-mentioned silicon compound is shown below.

[0018]

[Chemical 4] Y-Si (OH) ₃ generated in the reaction [1] has silanol groups such as HO-Si- on the substrate surface of PLA,
The silane coupling agent easily bonds with this silanol group.

[0019]

[Chemical 5] Further, since the functional group of the silane coupling agent has a good affinity with the acrylic binder resin contained in the color resist, it is possible to improve the adhesiveness between the silane coupling agent and the binder resin. . For the surface treatment of PLA, in the method of immersing the surface in a solution in which a silane coupling agent is dissolved in alcohol, about 0.01 to 0.1 wt% of the silane coupling agent is dissolved in methyl alcohol or ethyl alcohol. To do. Immerse PLA in this solution for a few minutes and then slowly pull it up to about 10
Dry at 0 ° C for about 20 minutes.

The condenser lens 5 is provided outside the PLA 2 produced in this way. As the condenser lens 5, a commonly used one can be applied.
Further, the light source 6 is provided outside thereof. As a specific light source, a halogen lamp, a metal halide lamp, a xenon lamp or the like is used. The illuminance of the light source is usually about 1 million lux. A reflecting mirror 7 is provided outside the light source 6.

Further, a projection lens is provided outside the TFT electrode substrate on the side opposite to the color filter installation portion. Further, a screen is provided on the outside of the liquid crystal display device. Here, as the projection lens and the screen, those normally used in a projection type color liquid crystal display device can be applied.

[0022]

By adopting the present invention, the adhesiveness between the PLA and the color filter, the adhesiveness between the color filter and the laminating resin, and the adhesiveness between the laminating resin and the PLA can be greatly improved, and the reliability is high. A color liquid crystal display device can be realized.

[0023]

【Example】

Example 1 Details of Example 1 of the present invention will be described below. As shown in FIG. 1, the structure of the present invention comprises a light source 6, a reflecting mirror 7, a condenser lens 5, a liquid crystal panel 1, a projection lens 8 and a screen 9. The light from the light source passes through the condenser lens and is then condensed by the PLA 2, and this light flux is red of the color filter formed on the PLA,
The light passes through the green and blue mosaic patterns and is incident on the liquid crystal layer and the pixel electrodes. Then, the incident light is modulated according to the video signal applied to the liquid crystal layer, and is projected on the screen by the projection lens. A halogen lamp, a metal halide lamp, a xenon lamp, or the like is used as the light source (lamp in this embodiment). The reflecting mirror is for reflecting the light emitted to the opposite side from the light source toward the liquid crystal panel.

In this example, among the silane coupling agents, the silane coupling agents having the amino groups shown below as functional groups were used. _{NH 2 (CH 2) 2 NH} (CH 2) 3 Si (OCH 3) 3 The silane coupling agent ethyl alcohol, is dissolved in an alcohol such as methyl alcohol, 0.01 to 0.1 as the concentration of the solution % (0.01 wt% concentration with ethyl alcohol in this example). After immersing PLA2 in a solution in which a silane coupling agent is dissolved, PLA is gradually pulled up and dried at 100 ° C. for 20 minutes. And the red, green, and blue color resists CR commercially available from Fuji Hunt Electronics on the PLA
The mosaic color filter 4 is formed using -2000, CG-2000, and CB-2000. First, the first color red color resist CR-2000 is applied on the PLA by a spinner so as to have a film thickness of about 1 to 2 μm. Then, exposure and development are performed to form a red mosaic pattern. Then, the second color green color resist CG-
2000 is applied onto PLA by a spinner, exposed and developed to form a green mosaic pattern. Finally, a third color blue color resist CB-2000 is applied on the PLA by a spinner, exposed and developed to form a blue mosaic pattern. After forming the mosaic color filter composed of red, green and blue, firing is continued for about 1 hour at 200 to 250 ° C. (about 200 ° C. in this example) to improve the solvent resistance of the color filter. . afterwards,
PLA on which a color filter is formed using an ultraviolet curable adhesive 3 is attached to the liquid crystal panel 1 (see FIG. 2).

Second Embodiment Next, a second embodiment will be described. In this example, among the above silane coupling agents, the silane coupling agents having a glycidoxy group as a functional group shown below were used.

[0026]

[Chemical 6] First, a solution of the above silane coupling agent in propylene glycol monoethyl ether acetate, which is a solvent for Fuji Hunt Electronics color resist, is prepared in advance, and the concentration of the silane coupling agent at that time is 0.1 to 1 wt%. Prepare (1w in this example)
t%). A color resist forming a color filter, CR-200 manufactured by Fuji Hunt Electronics Co., Ltd.
0, CG-2000, CB-2000, the above silane coupling solution is added. The silane coupling agent is added to the color resist in an amount of 0.01 to 0.1 wt% (0.01 wt% in this embodiment). First, a first color red color resist CR-2000 is applied in a PLA form by a spinner so as to have a film thickness of about 1 to 2 μm. Then, exposure and development are performed to form a red mosaic pattern. Then, the second color green color resist CR-2000 was spun on the PLA by a spinner to about 1-2 μm.
It is applied to give a film thickness of m. Then, exposure and development are performed to form a red mosaic pattern. Then, the second color green color resist CR-2000 is applied onto the PLA by a spinner, and exposed and developed to form a green mosaic pattern. Finally, the third color blue color resist CB-2000 is applied onto PLA by a spinner,
Exposure and development are performed to form a blue mosaic pattern.
Similar to Example 1, baking is performed at 200 to 250 ° C. (about 200 ° C. in this example) for about 1 hour in order to improve the solvent resistance of the color filter. After that, the PLA having the color filter formed thereon is attached to the liquid crystal panel by using an ultraviolet curable adhesive (see FIG. 3).

Third Embodiment Further, a third embodiment will be described. In this example, of the silane coupling agents, the silane coupling agent having the vinyl group shown below as a functional group was used.

[0028]

[Chemical 7] The silane coupling agent is added to the UV curable adhesive at a rate of about 0.01 wt%. Examples of the ultraviolet curable adhesive include the following (3000 series manufactured by ThreeBond Co., Ltd.). Three Bond Co., Ltd. 3000 series Loctite Co., Ltd. 350, 352 Sony Chemical Co., Ltd. Sony Bond 17A, 19
A Denki Kagaku Co., Ltd. Hard Rock OP-100
0 First of all, the red, green, and blue color resists CR-20 that are commercially available from Fuji Hunt Electronics Co., Ltd. on PLA.
00, CG-2000, CB-2000 to form a mosaic color filter. First, the red color resist CR-2000 was spun on the PLA to about 1
Apply to a film thickness of ˜2 μm. Then, exposure and development are performed to form a red mosaic pattern. afterwards,
A second color green color resist CR-2000 is applied onto the PLA by a spinner, exposed and developed to form a green mosaic pattern. Finally, a third color blue color resist CB-2000 is applied on the PLA by a spinner, exposed and developed to form a blue mosaic pattern. In order to improve solvent resistance, the mosaic color filter consisting of red, green and blue was formed.
Baking is performed at 200 to 250 ° C. (200 ° C. in this example) for about 1 hour. Next, of the above adhesives, 3 of Loctite Co., Ltd.
The silane coupling agent having a vinyl group as a functional group is added to 50, and the PLA having a color filter formed thereon is attached to the liquid crystal panel using the adhesive (see FIG. 4).

As described above, the present invention is not limited to the above-mentioned materials, and other silane coupling agents, ultraviolet curing adhesives, and color resists can be used.

[0030]

By employing the silane coupling agent described in the present invention, the PLA and the color filter are firmly bonded through the silane coupling agent, and the adhesive and the liquid crystal panel are firmly bonded together. It High temperature and high humidity test,
Peeling at each interface of PLA, color filter, adhesive, and glass can be improved even in an accelerated test such as a thermal cycle test. As a result, a highly reliable, lightweight and compact projection type color liquid crystal display device can be realized.

[Brief description of drawings]

FIG. 1 is a configuration diagram including an optical system of a projection type color liquid crystal display device of the present invention.

FIG. 2 is a panel configuration diagram based on the present invention.

FIG. 3 is a panel configuration diagram according to the present invention.

FIG. 4 is a panel configuration diagram according to the present invention.

FIG. 5 is a panel configuration diagram of a conventional projection type color liquid crystal display device.

[Explanation of symbols]

1 Liquid crystal panel 1a Opposite side substrate 1b TFT side substrate with active elements such as TFTs 2 PLA 3 Adhesive for bonding 4 Color filter consisting of red, green and blue 5 Condenser lens 6 Light source 7 Reflector 8 Projection lens 9 Screen 10 Silane Coupling Layer 11 Microlens Region 12 Sealing Resin 13 Liquid Crystal Layer 14 Color Filter with Silane Coupling Agent 15 Adhesive with Silane Coupling Agent

Claims (4)

[Claims] 1. A mosaic color filter corresponding to each of the red, green, and blue picture elements of a liquid crystal display panel is provided on a thin film transistor type liquid crystal panel in which a thin film transistor is added to each picture element, and each picture is provided thereon. In the manufacture of a liquid crystal display device provided with a planar lens array forming a lens array corresponding to the element, a light source is provided on the planar lens array, and a projection lens is provided on the liquid crystal panel opposite to the light source, A method for manufacturing a single panel type projection type color liquid crystal display device, which comprises forming a mosaic color filter after treating a planar lens array with a silane compound. 2. The method according to claim 1, wherein the method for treating the planar lens array with the silane compound is a method for treating the surface of the planar lens array with the silane compound. 3. The method of treating a silane compound of a planar lens array is a method of previously adding a silane compound to a mosaic color resist and applying the color resist onto the planar lens array. The manufacturing method described. 4. The manufacturing method according to claim 1, wherein the method of treating the silane compound of the planar lens array is a method of adding the silane compound to an adhesive agent for bonding the liquid crystal panel and the planar lens array.