BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic diagram of a prior art transflective liquid crystal display panel.
FIG. 2 is a top view of a pixel of the transflective liquid crystal panel according to a preferred embodiment of the present invention.
FIG. 3 is a cross-sectional view of a pixel of the transflective liquid crystal panel, taken along a cross-sectional line AA′ of FIG. 2.
FIG. 4 is a schematic diagram of a pixel of the transflective liquid crystal display panel according to another preferred embodiment of the present invention.
FIG. 5 is a cross-sectional view of a pixel of the transflective liquid crystal panel, taken along a cross-sectional line BB′ of FIG. 4.
FIG. 6 is a schematic diagram of a pixel of the transflective liquid crystal display panel according to another preferred embodiment of the present invention.
DETAILED DESCRIPTION
As shown in FIG. 1, according to the conventional transflective liquid crystal panel, the drop in height of the liquid crystal layer 40 may make a bad arrangement of liquid crystal molecules so as to result a light leakage problem. In addition, the liquid crystal molecules above the data line or scan line may also be easily affected by the signal disturbance, such as crosstalk problems, to result a light leakage problem. Please refer to FIG. 2 and FIG. 3. FIG. 2 is a top view of a pixel of the transflective liquid crystal panel according to a preferred embodiment of the present invention. FIG. 3 is a cross-sectional view of a pixel of the transflective liquid crystal panel, taken along a cross-sectional line AA′ of FIG. 2. As shown in FIG. 2 and FIG. 3, the transflective liquid crystal display panel 50 of the present embodiment comprises an array substrate 60, a color filter substrate 70 and a liquid crystal layer 80 disposed between the array substrate 60 and the color filter substrate 70. The array substrate 60 comprises a plurality of scan lines 52 and a plurality of data lines 54 arranged substantially perpendicular to the scan lines 52. A plurality of pixels 62 is defined among the scan lines 52 and the data lines 54, and each pixel 62 comprises a reflection region 621 and a transmission region 622. The color filter substrate 70 comprises a plurality of color filters 72 disposed corresponding to the pixels 62 and a black matrix 74 corresponding to an edge of each pixel 62. The array substrate 60 further comprises a plurality of thin-film transistors 63 disposed in each reflection region 621 respectively, a plurality of reflective electrodes 64 disposed on the thin-film transistor 63 and a plurality of transmissive electrodes 65 disposed in the transmission region 622.
In the transflective liquid crystal display panel 50 of the embodiment of the present invention, there is a light-shielding pattern which may be an organic light-shielding pattern 66 included between the reflective electrode 64 and the thin-film transistor 63, and the organic light-shielding pattern 66 not only has an effect of adjusting a cell gap but also shielding a leakage of light so as to have no requirement to dispose an extra light-shielding design. The design of the organic light-shielding pattern 66 should consider its light-shielding effect in choosing its material, so the light-shielding ratio of the organic light-shielding pattern 66 should be over about 70%. In other words, the transmissive transmittance should be from about 0% to about 30%. The material of the organic light-shielding pattern 66 can be various kinds of organic materials, such as resin or using a doping or mixing method to adjust its transmissive transmittance to reach an acceptable transmissive transmittance. The resin can use a black resin or grey resin etc., and the doping or mixing materials can be metal, such as chromium, metal oxide, such as chromium oxide, mixtures thereof or nonmetals, such as carbon, etc. For example, the material of the organic light-shielding pattern 66 can be a brown resin formed by positive photosensitive dye and novalac polymer, a black resin formed by positive photosensitive color pigment and acrylic resin adhesive or a black resin formed by negative black pigment and acrylic monomer etc.
The organic light-shielding pattern 66 of the embodiment is disposed in the reflection region 621 of the pixel 62 and on the border between the reflection region 621 and the transmission region 622. Therefore, the organic light-shielding pattern 66 in the reflection region 621 can heighten the reflective electrode 64 to form a double cell gap, so the organic light-shielding pattern 66 on the border between the reflection region 621 and the transmission region 622 can perform the light-shielding effect to prevent light leakage.
According to the present invention, other types of embodiments are provided to solve a problem of liquid crystal molecules on the data lines or the scan lines easily producing the light leakage. Please refer to FIG. 4 and FIG. 5. FIG. 4 is a schematic diagram of a pixel of the transflective liquid crystal display panel according to another preferred embodiment of the present invention. FIG. 5 is a cross-sectional view of a pixel of the transflective liquid crystal panel, taken along a cross-sectional line BB′ of FIG. 4. In the following embodiment, a basic structure of the transflective liquid crystal display panel has been disclosed in the above-mentioned embodiment, so no repeated statement thereof is in the following. As shown in FIG. 4, a pixel 92 of the transflective liquid crystal display panel is defined by the scan lines 94 and the data lines 96, and each pixel 92 comprises a reflection region 921 and a transmission region 922. In the embodiment, the organic light-shielding pattern 98 is not only disposed in the reflection region 921 and on the border between the reflection region 921 and the transmission region 922 but also covering the data lines 96 and on the border between the transmission region 922 and the transmission region 922 adjacent thereto. As shown in FIG. 5, according to the above-mentioned disposition, the organic light-shielding pattern 98 can avoid the area adjacent to the data lines 96 light leakage.
Please refer to FIG. 6, which is a schematic diagram of a pixel of the transflective liquid crystal display panel according to another preferred embodiment of the present invention. As shown in FIG. 6, a pixel 102 of the transflective liquid crystal display panel is defined by the scan lines 104 and the data lines 106, and each pixel 102 comprises a reflection region 1021 and a transmission region 1022. Differing from the above-mentioned embodiment, the organic light-shielding pattern 108 of the embodiment is not only disposed in the reflection region 1021 but also disposed surrounding the transmission region 1022. That is to say that the organic light-shielding pattern 108 covers the scan lines 104 and the data lines 106. According to the above-mentioned disposition, the organic light-shielding pattern 108 can avoid light leakage when the surrounding area of the pixel 102 is lit.
One of the particulars of the present invention is to solve the light leakage problem by using the organic light-shielding pattern, and the application of the present invention is not limited to the above-mentioned embodiment. The position of the organic light-shielding pattern can be adjusted according to the different position of the pixel of the transflective liquid crystal display panel so as to achieve the best light-shielding effect. Moreover, the organic light-shielding pattern is not limited to have only one thickness and can have different thickness according to the light-shielding effect or the consideration in the process in different position of the pixel region. In addition, the material of the organic light-shielding pattern is not limited to the material disclosed in the above-mentioned embodiment and can use any other material having light-shielding characteristics and compatible with the process.
In summary, the present invention uses the organic light-shielding pattern having light-shielding function to replace a conventional transparent dielectric layer. Therefore, the organic light-shielding pattern not only has a function to form the double cell gap but also can directly perform a light-shielding function to solve the light leakage problem, so there is no requirement to extra add cost to dispose the extra light-shielding device and even no problem of affecting aperture ratio.
Those skilled in the art will readily observe that numerous modifications and alterations of the device and method may be made while retaining the teachings of the invention. Accordingly, the above disclosure should be construed as limited only by the metes and bounds of the appended claims.
Patent Application
20080043184
