# US 2014/0152929 A1 · Display device

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- Number: US 2014/0152929 A1
- Document ID: US20140152929A1
- Status: Published application
- Kind: A1
- Application number: 14/094,936
- Filed: 2013-12-03
- Published: 2014-06-05
- Earliest claimed: 2012-12-03
- Assignees: Japan Display Inc.
- Applicants: Japan Display Inc.
- Inventors: Ryo IMAI; Gou YAMAMOTO
- Web page: https://patentgrep.com/patent/US20140152929A1

## CPC

- G02F 1/134336: {Matrix}
- G09G 3/3611: {Control of matrices with row and column drivers}
- G09G 3/3648: {using an active matrix (G09G3/367 - G09G3/3696 take precedence)}
- G09G 2300/0452: Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
- G09G 2300/0465: Improved aperture ratio, e.g. by size reduction of the pixel circuit, e.g. for improving the pixel density or the maximum displayable luminance or brightness
- G09G 2320/0233: Improving the luminance or brightness uniformity across the screen
- G09G 2320/0247: Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00)

## Abstract

Pixel electrodes of a display device include plural first pixel electrodes and plural second pixel electrodes which have areas different from each other. Each of plural scanning signal lines is connected with any one of the plural first pixel electrodes and the plural second pixel electrodes through respective transistors. A control circuit applies a first conducting voltage that is a conducting voltage which is applied to the scanning signal lines connected with the first pixel electrodes, and a second conducting voltage that is a conducting voltage which is applied to the scanning signal lines connected with the second pixel electrodes, and different from the first conducting voltage.

## Claims

### Claim 1

A display device comprising:
a plurality of scanning signal lines that extends in one direction and is arranged in parallel in a display area of a substrate;
transistors that are arranged for each of pixels along each of the plurality of scanning signal lines, and respectively have gates connected to the scanning signal lines;
pixel electrodes to each of which a potential corresponding to a grayscale value of each of pixels is applied through each of the transistors, by applying a conducting voltage for rendering each of the transistors conductive to the scanning signal line; and
a control circuit that applies the conducting voltage,
wherein the pixel electrodes include a plurality of first pixel electrodes and a plurality of second pixel electrodes which have different areas from each other in a plan view from a direction perpendicular to a surface of the substrate,
wherein each of the plurality of scanning signal lines is connected with only any one of the plurality of first pixel electrodes and the plurality of second pixel electrodes through each of the transistors, and
wherein the control circuit applies a first conducting voltage that is the conducting voltage which is applied to the scanning signal lines connected with the first pixel electrodes, and a second conducting voltage, which is different from the first conducting voltage, that is the conducting voltage which is applied to the scanning signal lines connected with the second pixel electrodes.

### Claim 2 (depends on 1)

The display device according to claim 1,
wherein when an area of the second pixel electrodes is larger than an area of the first pixel electrodes, a potential difference of the second conducting voltage is larger than a potential difference of the first conducting voltage.

### Claim 3 (depends on 1)

The display device according to claim 1,
wherein the first pixel electrodes are pixel electrodes that control lights for red wavelength range and green wavelength range,
wherein the second pixel electrodes are pixel electrodes that control lights for blue wavelength range and white wavelength range, and
wherein the pixel electrodes that control the lights for the blue wavelength range and white wavelength range are alternately arrayed on the same scanning signal lines, and the area of the second pixel electrodes is larger than the area of the first pixel electrodes.

### Claim 4 (depends on 1)

The display device according to claim 1,
wherein a counter electrode comprises a common electrode that forms an electric field in cooperation with the pixel electrodes, and covers an overall area of the display area.

### Claim 5

A display device comprising:
a substrate;
a plurality of scanning signal lines that is formed on the substrate;
a plurality of pixels that is arranged along the scanning signal lines;
transistors each having a gate connected to the scanning signal line;
a driver circuit that applies a scanning signal to the scanning signal lines; and
pixel electrodes that are disposed for each of the pixels, and electrically connected to each of the transistors,
wherein the pixel electrodes include first pixel electrodes and second pixel electrodes larger in area than the first pixel electrodes,
wherein the scanning signal lines include first scanning signal lines and second scanning signal lines,
wherein the first scanning signal lines are electrically connected to the first pixel electrodes through each of the transistors,
wherein the second scanning signal lines are electrically connected to the second pixel electrodes through each of the transistors,
wherein scanning signals have a high voltage for turning on the transistors, and a low voltage for turning off the transistors,
wherein the driver circuit outputs a first high voltage to the first scanning signal lines, and outputs a second high voltage to the second scanning signal lines, and
wherein the first high voltage is different from the second high voltage.

### Claim 6 (depends on 5)

The display device according to claim 5,
wherein the second high voltage is higher than the first high voltage.

### Claim 7 (depends on 5)

The display device according to claim 5,
wherein the first pixel electrodes are pixel electrodes that control lights of red and green wavelength ranges,
wherein the second pixel electrodes are pixel electrodes that control lights of blue and white wavelength ranges, and
wherein the pixel electrodes that control the lights of the blue and white wavelength ranges are alternately arrayed along the same second scanning signal lines.

### Claim 8 (depends on 5)

The display device according to claim 5,
wherein the area of the second pixel electrodes is larger than the area of the first pixel electrodes by 20% or higher.

### Claim 9

A display device, comprising:
a first substrate and a second substrate;
color filters that are disposed on the second substrate;
a plurality of scanning signal lines that is formed on the first substrate;
a plurality of image signal lines that intersects with the scanning signal lines, and is formed on the first substrate;
a driver circuit that applies a scanning signal to the scanning signal lines;
a plurality of pixels that is formed on the first substrate in a matrix;
transistors and pixel electrodes which are formed on each of the pixels; and
gates, input electrodes, and output electrodes which are disposed in each of the transistors, in which the gates are connected to each of the scanning signal lines, the input electrodes are connected to each the image signal lines, and the output electrodes are connected to each of the pixel electrodes,
wherein the pixel electrodes include first pixel electrodes, and second pixel electrodes larger in area than the first pixel electrodes,
wherein the scanning signal lines have first scanning signal lines and second scanning signal lines,
wherein the first scanning signal lines are electrically connected to the first pixel electrodes through each of the transistors,
wherein the second scanning signal lines are electrically connected to the second pixel electrodes through each of the transistors,
wherein the scanning signal has an amplitude between a high voltage and a low voltage lower than the high voltage,
wherein the driver circuit outputs a first scanning signal to the first scanning signal lines, and outputs a second scanning signal to the second scanning signal lines, and
wherein the high voltage of the first scanning signal is lower than the high voltage of the second scanning signal.

### Claim 10 (depends on 9)

The display device according to claim 9,
wherein the color filters include:
a red filter that transmits a light of a red wavelength range;
a green filter that transmits a light of a green wavelength range;
a blue filter that transmits a light of a blue wavelength range; and
a white filter that transmits a light of a white wavelength range;
wherein the first pixel electrodes include red pixel electrodes facing the red filter, and green pixel electrodes facing the green filter, and
wherein the second pixel electrodes include blue pixel electrodes facing the blue filter, and white pixel electrodes facing the white filter.

### Claim 11 (depends on 9)

The display device according to claim 9,
wherein the color filters include:
a red filter that transmits a light of a red wavelength range;
a green filter that transmits a light of a green wavelength range;
a blue filter that transmits a light of a blue wavelength range; and
a white filter that transmits a light of a white wavelength range;
wherein the first pixel electrodes include red pixel electrodes facing the red filter, and green pixel electrodes facing the green filter,
wherein the second pixel electrodes include blue pixel electrodes facing the blue filter, and white pixel electrodes facing the white filter, and
wherein the blue pixel electrodes and the white pixel electrodes are alternately arrayed along the same scanning signal line.

### Claim 12 (depends on 9)

The display device according to claim 9,
wherein the area of the second pixel electrodes is larger than the area of the first pixel electrodes by 20% or higher.