Method for driving semiconductor device

• US 9,978,320 B2
• Filed: 05/06/2016
• Issued: 05/22/2018
• Est. Priority Date: 04/08/2009
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Kimura, Hajime
• Primary Examiner(s): Ma, Calvin C
• Application Number:
  US15/148,351
• Publication Number:
  US 20160247466A1
• Time in Patent Office: 746 Days
• Field of Search: 345 87, 345102, 349 65, 359 48
• CPC Class Codes: G09G 2300/0452 Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
• CPC Class Codes: G09G 2320/0233 Improving the luminance or brightness uniformity across the screen
• CPC Class Codes: G09G 3/3406 Control of illumination source illumination devices structurally associated with liquid crystal cells G02F1/1336
• CPC Class Codes: G09G 3/3413 Details of control of colour illumination sources
• CPC Class Codes: G09G 3/36 using liquid crystals
• CPC Class Codes: G09G 3/3607 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels display of colours in flat matrix panels other than liquid crystal displays G09G3/2003; grey scales specific for television H04N3/127
• CPC Class Codes: G09G 3/3614 Control of polarity reversal in general
• CPC Class Codes: G09G 3/3685 Details of drivers for data electrodes
• CPC Class Codes: G09G 5/10 Intensity circuits
• CPC Class Codes: H04N 5/142 Edging; Contouring
• CPC Class Codes: H04N 5/208 for compensating for attenuation of high frequency components, e.g. crispening, aperture distortion correction
• CPC Class Codes: H04N 7/0125 one of the standards being a high definition standard

Abstract

The resolution of a low-resolution image is made high and a stereoscopic image is displayed. Resolution is made high by super-resolution processing. In this case, the super-resolution processing is performed after edge enhancement processing is performed. Accordingly, a stereoscopic image with high resolution and high quality can be displayed. Alternatively, after image analysis processing is performed, edge enhancement processing and super-resolution processing are concurrently performed. Accordingly, processing time can be shortened.

Claims

1. A display device comprising:

a pixel portion; and

a backlight under the pixel portion, the backlight comprising a first light source, a second light source, and a light guiding plate,

wherein, depending on image signals supplied to the pixel portion, luminance of the first light source is different from luminance of the second light source,

wherein the first light source is provided adjacent to a first end of the light guiding plate,

wherein the second light source is provided adjacent to a second end facing the first end of the light guiding plate,

wherein each of the first light source and the second light source comprises a white light emitting element and light emitting elements of at least three colors other than white, and

wherein each of the first light source and the second light source is configured to emit white light using only the white light emitting element.

2. The display device according to claim 1, wherein the luminance of the first light source and the second light source is independently controllable.

3. The display device according to claim 1, further comprising a diffusing plate between the backlight and the pixel portion.

4. The display device according to claim 1, wherein the white light emitting element comprises a white light emitting diode.

5. The display device according to claim 1, wherein the light emitting elements of at least three colors other than white comprise a red light emitting diode, a blue light emitting diode, and a green light emitting diode.

6. A display device comprising:

a pixel portion; and

a backlight under the pixel portion, the backlight comprising a first light emitting element, a second light emitting element, and a light guiding plate,

wherein, depending on image signals supplied to the pixel portion, luminance of the first light emitting element is different from luminance of the second light emitting element,

wherein the first light emitting element is provided adjacent to a first end of the light guiding plate,

wherein the second light emitting element is provided adjacent to a second end facing the first end of the light guiding plate,

wherein each of the first light emitting element and the second light emitting element comprises a white light emitting diode and light emitting diodes of at least three colors other than white, and

wherein each of the first light emitting element and the second light emitting element is configured to emit white light using only the white light emitting diode.

7. The display device according to claim 6, wherein the luminance of the first light emitting element and the second light emitting element is independently controllable.

8. The display device according to claim 6, further comprising a diffusing plate between the backlight and the pixel portion.

9. The display device according to claim 6, wherein the light emitting diodes of at least three colors other than white comprise a red light emitting diode, a blue light emitting diode, and a green light emitting diode.

10. A display device comprising:

a pixel portion; and

a backlight under the pixel portion, the backlight comprising a plurality of first light sources, a plurality of second light sources, and a light guiding plate,

wherein, depending on image signals supplied to the pixel portion, luminance of the plurality of first light sources is different from luminance of the plurality of second light sources,

wherein the plurality of first light sources are provided adjacent to a first end of the light guiding plate,

wherein the plurality of second light sources are provided adjacent to a second end facing the first end of the light guiding plate,

wherein each of the plurality of first light sources and the plurality of second light sources comprises a white light emitting element and light emitting elements of at least three colors other than white, and

wherein each of the plurality of first light sources and the plurality of second light sources is configured to emit white light.

11. The display device according to claim 10, wherein the luminance of the plurality of first light sources and the plurality of second light sources is independently controllable.

12. The display device according to claim 10, further comprising a diffusing plate between the backlight and the pixel portion.

13. The display device according to claim 10, wherein the white light emitting element comprises a white light emitting diode.

14. The display device according to claim 10, wherein the light emitting elements of at least three colors other than white comprise a red light emitting diode, a blue light emitting diode, and a green light emitting diode.