Transflective liquid crystal display and manufacturing method thereof
View Patent ↗The present invention provides a transflective liquid crystal display having reflection regions and transmission regions, including a first substrate, a light transmissive layer formed on the first substrate and having recessed portions corresponding to the transmission regions, color filters formed on the light transmissive layer and having a position-dependent thickness due to the recessed portions of the light transmissive layer, transparent electrodes formed on the first substrate, reflective electrodes disposed on the reflection regions and interposed between the light transmissive layer and the color filters, a second substrate, a common electrode formed on the second substrate, and a liquid crystal layer interposed between the first substrate and the second substrate.
1. A transflective liquid crystal display having reflection regions and transmission regions, and comprising:
a first substrate;
a light transmissive layer disposed on the first substrate and including recessed portions corresponding to the transmission regions;
color filters disposed on the light transmissive layer and including a position-dependent thickness due to the recessed portions of the light transmissive layer;
transparent electrodes disposed on the first substrate;
reflective electrodes electrically connected to the transparent electrodes and interposed between the light transmissive layer and the color filters;
a second substrate;
a common electrode disposed on the second substrate; and
a liquid crystal layer interposed between the first substrate and the second substrate.
2. The transflective liquid crystal display of claim 1 , further comprising:
TFTs having gate electrodes formed on the first substrate, semiconductors formed on or under the gate electrodes and insulated from the gate electrodes, source and drain electrodes connected to the semiconductors; and
wherein pixel electrodes are composed of the transparent electrodes and the reflective electrodes, which are connected to the drain electrodes.
3. The transflective liquid crystal display of claim 2 , further comprising an insulating layer interposed between the second substrate and the common electrode and having recessed portions facing the recessed portions of the light transmissive layer.
4. The transflective liquid crystal display of claim 3 , wherein the recessed portions of the light transmissive layer have a depth substantially the same as the thickness of the color filter on the reflection regions.
5. The transflective liquid crystal display of claim 1 , wherein the thickness of the light transmissive layer at the recessed portions is zero.
6. The transflective liquid crystal display of claim 1 , wherein the light transmissive layer has an embossed surface and the reflective electrodes have an embossed structure due to the embossed surface of the light transmissive layer.
7. The transfiective liquid crystal display of claim 6 , wherein the transparent electrodes are disposed on the color filters.
8. The transflective liquid crystal display of claim 6 , further comprising an insulating layer interposed between the second substrate and the common electrode and having recessed portions facing the recessed portions of the light transmissive layer.
9. The transflective liquid crystal display of claim 8 , wherein the recessed portions of the light transmissive layer have a depth substantially the same as the thickness of the color filter on the reflection regions.
10. The transflective liquid crystal display of claim 1 , wherein the color filters have a substantially flat top surface.
11. The transflective liquid crystal display of claim 1 , wherein the thickness of the color filters on the transmission region is twice that on the reflection regions.
12. The transflective liquid crystal display of claim 11 , wherein the transparent electrodes are disposed on the color filters.
13. The transflective liquid crystal display of claim 11 , further comprising an insulating layer interposed between the second substrate and the common electrode and having recessed portions facing the recessed portions of the light transmissive layer.
14. The transflective liquid crystal display of claim 13 , wherein the recessed portions of the light transmissive layer have a depth substantially the same as the thickness of the color filter on the reflection regions.
15. The transflective liquid crystal display of claim 1 , wherein the transparent electrodes is disposed on the color filters.
16. The transflective liquid crystal display of claim 15 , further comprising an insulating layer interposed between the second substrate and the common electrode and having recessed portions facing the recessed portions of the light transmissive layer.
17. The transflective liquid crystal display of claim 16 , wherein the recessed portions of the light transmissive layer have a depth substantially the same as the thickness of the color filter on the reflection regions.
18. The transflective liquid crystal display of claim 1 , wherein the liquid crystal layer has liquid crystals aligned in parallel to the first and second substrates and in a same direction when no electric field is applied.
19. The transflective liquid crystal display of claim 1 , further comprising:
a first alignment layer formed on the color filters; and
a second alignment layer formed on the common electrode,
wherein the rubbing direction of the first alignment layer is parallel with that of the second alignment layer.
20. The transflective liquid crystal display of claim 1 , wherein the liquid crystal layer has liquid crystals aligned vertical to the first and second substrates when no electric field is applied.