Liquid crystal display
View Patent ↗A liquid crystal display including a LC panel including a first display panel having first to n-th gate lines (n>2) and data lines crossing the gate lines and forming a pixel, and a second display panel which faces the first display panel, the aperture ratio of a first pixel line electrically connected to the first gate line is smaller than that of a second to a n-th pixel line electrically connected to the second to the n-th gate line, respectively, and a gate driver having first and the second pull-down transistors which decrease the voltage of each gate line to a low level, the first and second pull-down transistors are connected to start and end terminals of the each gate line, a width-to-length ratio of a channel of the second pull-down transistor is 0.8 to 3 times as large as that of a channel of the first pull-down transistor.
1. A liquid crystal display comprising:
a liquid crystal panel comprising:
a first display panel having first to n-th gate lines (n>2) and a plurality of data lines crossing the first to the n-th gate lines and forming a pixel, and
a second display panel disposed to face the first display panel, an aperture ratio of a first pixel line electrically connected to the first gate line is smaller than an aperture ratio of a second to a n-th pixel line electrically connected to the second to the n-th gate line, respectively; and
a gate driver comprising first and the second pull-down transistors which decrease a voltage of each gate line to a low level, the first and the second pull-down thin film transistors are connected to a start terminal and an end terminal of the each gate line, respectively,
a width-to-length ratio of a channel of the second pull-down thin film transistor is approximately 0.8 to 3 times as large as a width-to-length ratio of a channel of the first pull-down thin film transistor.
2. The liquid crystal display of claim 1 , wherein the gate driver comprises a first to n-th stages (n>2) which supplies a first to a n-th gate signal to the first to the n-th gate lines, respectively,
the first to the n-th stages having the first and the second pull-down thin film transistor, respectively,
a width-to-length ratio of the channel of the second pull-down thin film transistor of the first stage is less than a width-to-length ratio of the channel of the second pull-down thin film transistor of the second to n-th stages.
3. The liquid crystal display of claim 2 , wherein the first-pull down transistor of the first stage is larger than the first pull-down transistor of the second to the n-th stages such that a voltage level of the first pixel line is decreased rapidly.
4. The liquid crystal display of claim 1 , wherein the first display panel further comprises a black matrix overlapping with the first pixel line more than with the second to the n-th pixel lines.
5. The liquid crystal display of claim 4 , wherein the black matrix comprises a stripe shape crossing the first pixel line.
6. The liquid crystal display of claim 1 , wherein the second display panel further comprises a black matrix overlapping with the first pixel line more than with the second to the n-th pixel lines.
7. The liquid crystal display of claim 1 , wherein a pixel of the first pixel line is smaller than a pixel of the second to n-th pixel line.
8. The liquid crystal display of claim 7 , wherein a pixel electrode of the first pixel line is smaller than a pixel electrode of the second to n-th pixel line.
9. The liquid crystal display of claim 8 , wherein a length of the pixel electrode of the first pixel line measured along a direction substantially parallel to the data lines is shorter than that of the pixel electrode of the second to n-th pixel line.
10. The liquid crystal display of claim 7 , wherein a gap between a non-display area of the liquid crystal panel and the first gate line is formed smaller than a gap of each second to the n-th gate line such that a size of the first pixel line is less than a size of the second to the n-th pixel line.
11. The liquid crystal display of claim 1 , wherein the aperture ratio of the first pixel line is approximately 30 to 90 percent that of the aperture ratio of the second to n-th pixel lines.
12. The liquid crystal display of claim 11 , wherein the aperture ratio of the first pixel line is approximately 30 to 50 percent that of the aperture ratio of the second to the n-th pixel line, when dots per inch of the pixel is less than approximately 110.
13. The liquid crystal display of claim 11 , wherein the aperture ratio of the first pixel line is approximately 50 to 90 percent that of the aperture ratio of the second to the n-th pixel line, when dots per inch of the pixel is more than approximately 110.
14. A liquid crystal display comprising:
a liquid crystal panel comprising:
a first display panel comprising first to n-th gate lines (n>2) and a plurality of data lines crossing the first to n-th gate lines and forming a pixel, and
a second display panel disposed to face the first display panel; and
a gate driver comprising a first to n-th stages which supplies a first to n-th gate signals (n>2) to first to n-th gate lines (n>2), respectively, the first to the n-th stages respectively comprise a first and a second pull-down thin film transistor which decrease the voltages of the first to n-th gate lines to a low level, each first pull-down thin film transistor is connected to a start terminal of the first to the n-th gate lines, and each second pull-down thin film transistor is connected to an end terminal of the first to the n-th gate lines,
a width-to-length ratio of a channel of the first pull-down thin film transistor of the first stage is approximately 2 to 5 times as large as a width-to-length ratio of a channel of the each first pull-down thin film transistor of the second to n-th stages.
15. The liquid crystal display of claim 14 , wherein the width-to-length ratio of a channel of the second pull-down thin film transistor of the first stage is approximately 0.8 to 3 times as large as the width-to-length ratio of a channel of the first pull-down thin film transistor of the first stage.
16. The liquid crystal display of claim 14 , wherein a gap between a non-display area of the liquid crystal panel and the first gate line is formed smaller than a gap of each second to the n-th gate line.
17. The liquid crystal display of claim 14 , wherein the first-pull down transistor of the first stage is larger than the first pull-down transistor of the second to the n-th stages.