Low color-shift liquid crystal display and driving method therefor

Abstract

A liquid crystal display including a number of scan lines, a number of data lines, a pixel, a first switch circuit, and a second switch circuit is provided. The scan lines include an Nth scan line and an (N+1)th scan line, where N is a positive integer. The pixel includes a first sub-pixel and a second sub-pixel. The first switch circuit is coupled to both the Nth scan line and the (N+1)th scan line and is used for controlling the second sub-pixel. The second switch circuit is coupled to the Nth scan line and is used for controlling the first sub-pixel. The pixel is used for displaying a red, a green, a blue, or a white color.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 (Related Art) is a conventional pixel equivalent circuit diagram;

FIG. 2(Related Art) is a transmittance vs. driving voltage diagram of a conventional liquid crystal display under different view-angles;

FIG. 3(Related Art) is a grey level vs. driving voltage diagram of a conventional liquid crystal display under different view-angles;

FIG. 4 is a pixel equivalent circuit diagram of a liquid crystal display according to a preferred embodiment of the invention;

FIG. 5 is a method for driving the pixel of a liquid crystal display according to a preferred embodiment of the invention;

FIG. 6A is a first circuit block diagram for driving a data line according to a preferred embodiment of the invention;

FIG. 6B is a second circuit block diagram for driving a data line according to a preferred embodiment of the invention; and

FIG. 7A-FIG. 7D are respective layout diagrams of a first sub-pixel and a second sub-pixel according to a preferred embodiment of the invention.

Claims

1. A liquid crystal display, comprising: a plurality of scan lines having an Nth scan line and an (N+1)th scan line, where N is a positive integer;a plurality of data lines having an Mth data line, where M is a positive integer;a pixel having a first sub-pixel and a second sub-pixel, the first sub-pixel and the second sub-pixel being both disposed between the Nth scan line and the (N+1)th scan line, the first sub-pixel and the second sub-pixel being both disposed on the same side of the Mth data line;a first switch circuit, electrically coupled to both the Nth scan line and the (N+1)th scan line, for controlling the second sub-pixel; anda second switch circuit, electrically coupled to the Nth scan line, for controlling the first sub-pixel.

2. The liquid crystal display of claim 1, wherein the first switch circuit comprises: a first transistor having a first gate, a first source and a first drain, the first gate being controlled by the Nth scan line, the first source being coupled to the Mth data line; anda second transistor having a second gate, a second source and a second drain, the second gate being controlled by the (N+1)th scan line, the second source being coupled to the first drain, the second drain being coupled to the second sub-pixel, wherein when the first transistor and the second transistor are turned on at the same time, the second sub-pixel receives a sub-pixel voltage from the Mth data line via the first transistor and the second transistor.

3. The liquid crystal display of claim 1, wherein the ratio of the layout area of the first sub-pixel to the layout area of the second sub-pixel ranges approximately from 9:1 to 1:1.

4. The liquid crystal display of claim 1, wherein the layout area of the first sub-pixel is larger than the layout area of the second sub-pixel.

5. The liquid crystal display of claim 1, further comprising: a first look-up table for outputting a first sub-pixel data value to control the first sub-pixel according to an original pixel data;a second look-up table for outputting a second sub-pixel data value to control the second sub-pixel according to the original pixel data; anda data driver, electrically coupled to the data lines, for outputting a first sub-pixel voltage and a second sub-pixel voltage corresponding to the first sub-pixel and the second sub-pixel, respectively, according to the first sub-pixel data value and the second sub-pixel data value.

6. The liquid crystal display of claim 1, further comprising: a first Gamma circuit for generating a first group Gamma voltage corresponding to the first sub-pixel;a second Gamma circuit for generating a second group Gamma voltage corresponding to the second sub-pixel; anda data driver, electrically coupled to the data lines, for outputting a first sub-pixel voltage and a second sub-pixel voltage corresponding to the first sub-pixel and the second sub-pixel, respectively, according to the first group Gamma voltage and the second group Gamma voltage.

7. A method for driving a liquid crystal display, the liquid crystal display comprising a plurality of data lines, a plurality of scan lines and a pixel, the scan lines comprising an Nth scan line and an (N+1)th scan line, N being a positive integer, the data lines comprising an Mth data line, M being a positive integer, the pixel having a first sub-pixel and a second sub-pixel, the first sub-pixel and the second sub-pixel being disposed between the Nth scan line and the (N+1)th scan line, the first sub-pixel and the second sub-pixel being disposed on the same side with the Mth data line, the method comprising: generating a first pulse signal and a second pulse signal on the first the scan line during a frame period, the second pulse signal having a duration;generating a third pulse signal and a fourth pulse signal on the second scan line during the frame period;transmitting a second sub-pixel voltage on the Mth data line to the second sub-pixel when the second pulse signal and the third pulse signal are overlapped during the duration; andtransmitting a first sub-pixel voltage on the Mth data line to the first sub-pixel when the second pulse signal and the third pulse signal are not overlapped during the duration.

8. The method of claim 7, further comprising: generating a first sub-pixel data value to control the first sub-pixel according to an original pixel data;generating a second sub-pixel data value to control the second sub-pixel according to the original pixel data; andgenerating a first sub-pixel voltage and a second sub-pixel voltage corresponding to the first sub-pixel and the second sub-pixel, respectively, according to the first sub-pixel data value and the second sub-pixel data value.

9. The method of claim 7, further comprising: generating a first group Gamma voltage corresponding to the first sub-pixel;generating a second group Gamma voltage corresponding to the second sub-pixel; andgenerating a first sub-pixel voltage and a second sub-pixel voltage corresponding to the first sub-pixel and the second sub-pixel, respectively, according to the first group Gamma voltage and the second group Gamma voltage.