It is an object to provide a display device in which a problem of light leakage from a liquid crystal element in black display is reduced or overcome and the contrast is improved. It is another object to provide a pixel circuit having a function to control a lighting state of a backlight based on each pixel. These objects are achieved by turning off a light-emitting element in display of a black gray scale, and by providing a light-emitting element in each pixel and providing, in a pixel circuit, a function to individually control lighting and non-lighting of the light-emitting element depending on a gray scale to perform display. When a backlight is provided in each pixel, a light-emitting element that is a backlight is turned off when a black gray scale is displayed, whereby reduction in contrast due to light leakage from a liquid crystal element can be prevented.

Claims

16 · 2 independent · depth 2

16 granted claims

›1.independentA display device comprising: a plurality of pixels, each of the plurality of pixels comprising: a semiconductor film; a gate electrode over the semico…+7

›2.↳ 1The display device according to claim 1, wherein each of the plurality of pixels further comprises a transistor electrically connected to the first co…d2

›3.↳ 1The display device according to claim 1, wherein each of the plurality of pixels further comprises a color filter overlapping with the light emitting …d2

›4.↳ 1The display device according to claim 1, wherein the light emitting diode emits red light, green light or blue light.d2

›5.↳ 1The display device according to claim 1,nwherein the plurality of pixels includes at least a first pixel, a second pixel and a third pixel,wherein the…d2

›6.↳ 1The display device according to claim 1, wherein the display device is a television device.d2

›7.↳ 1The display device according to claim 1, wherein the liquid crystal element comprises a liquid crystal layer comprising a polymer and liquid crystals …d2

›8.↳ 1The display device according to claim 1, further comprising an insulating film covering the light emitting electrode, andnthe liquid crystal element o…d2

›9.independentA display device comprising: a plurality of pixels, each of the plurality of pixels comprising: a semiconductor film; a gate electrode over the semico…+7

›10.↳ 9The display device according to claim 9, wherein each of the plurality of pixels further comprises a transistor electrically connected to the first co…d2

›11.↳ 9The display device according to claim 9, wherein each of the plurality of pixels further comprises a color filter overlapping with the light emitting …d2

›12.↳ 9The display device according to claim 9, wherein the light emitting diode emits red light, green light or blue light.d2

›13.↳ 9The display device according to claim 9,nwherein the plurality of pixels includes at least a first pixel, a second pixel and a third pixel,wherein the…d2

›14.↳ 9The display device according to claim 9, wherein the display device is a television device.d2

›15.↳ 9The display device according to claim 9, wherein the liquid crystal element comprises a liquid crystal layer comprising a polymer and liquid crystals …d2

›16.↳ 9The display device according to claim 9, further comprising an insulating film covering the light emitting electrode, andnthe liquid crystal element o…d2

Classifications

5 codes

IPC · International Patent Classification

Section G — Physics

G09G3/34
G09G3/36
G09G3/32
G02F1/1335
G02F1/1362

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3.5 y

1,267 days filing → grant

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non-final + final

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Rodney Amadiz

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›Priority documents — 1

Type	Document	Date
related publication	US 20120194749 A1	2 Aug 2012

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