Liquid crystal display device
View Patent ↗Provided is a liquid crystal display device, which includes a TFT substrate ( 230 ) including: first pixel electrodes ( 237 ) which are pixel electrodes at regions corresponding to first filter regions; second pixel electrodes ( 238 ) which are pixel electrodes at regions corresponding to second filter regions. The liquid crystal display device has a brightness priority mode, which puts priority on bright screen display, and a response speed priority mode, which puts priority on response of a liquid crystal composition at a time of rewriting of a screen. In the response speed priority mode, a voltage to be applied to the second pixel electrode ( 238 ) differs from that in the brightness priority mode. With this, it is possible to realize high transmittance and low power consumption while responding to display of images requiring high response speed.
1. A liquid crystal display device, comprising:
a first filter region in which a color resist film is formed;
a second filter region including a high transmittance region in which light transmittance is higher than the first filter region;
a first pixel electrode for controlling, by a voltage to be applied, an amount of transmittance of light that passes through the first filter region;
a second pixel electrode for controlling, by a voltage to be applied, an amount of transmittance of light that passes through the second filter region;
a first pixel transistor for controlling gradation voltage application to the first pixel electrode; and
a second pixel transistor for controlling gradation voltage application to the second pixel electrode,
wherein the gradation voltage application to the first pixel electrode and the gradation voltage application to the second pixel electrode are separately controlled by the first pixel transistor and the second pixel transistor, respectively.
2. The liquid crystal display device according to claim 1 , wherein:
each of the first pixel transistor and the second pixel transistor is controlled in a brightness priority mode, which puts priority on bright screen display, and a response speed priority mode, which puts priority on response of a liquid crystal composition at a time of rewriting of a screen; and
the voltage to be applied to the second pixel electrode is controlled differently between the response speed priority mode and the brightness priority mode.
3. The liquid crystal display device according to claim 2 , wherein, in the response speed priority mode, the second pixel electrode is always applied with a gradation voltage for black display.
4. The liquid crystal display device according to claim 2 , wherein, in the response speed priority mode, the second pixel electrode is set to have a voltage range which is narrower than a voltage range set in the brightness priority mode.
5. The liquid crystal display device according to claim 2 , wherein:
the first pixel transistor and the second pixel transistor each have a gate applied with a gate signal having a high frequency;
in the brightness priority mode, the same gradation voltage is consecutively applied two times to the second pixel electrode; and
in the response speed priority mode, a gradation voltage for black display and a gradation voltage for image display are applied in the stated order to the second pixel electrode.
6. The liquid crystal display device according to claim 1 , wherein, in the high transmittance region, the same color resist film as the color resist film formed in the first filter region is formed thinner than the color resist film of the first filter region.
7. The liquid crystal display device according to claim 1 , wherein, in the second filter region, the same color resist film as the color resist film formed in the first filter region is formed to surround the high transmittance region in a view from the direction perpendicular to a display surface and have the same thickness as the color resist film formed in the first filter region.
8. The liquid crystal display device according to claim 1 , wherein the second filter region is disposed adjacent to the first filter region through intermediation of a black matrix.
9. The liquid crystal display device according to claim 1 , wherein:
a number of the second filter regions is the same as a number of the first filter regions; and
all of the first filter regions have the corresponding second filter regions, respectively.