Display panel and information processing device

Patent metadata

Field	Value
Publication number	US-2016283028-A1
Application number	US-201615076927-A
Country	US
Kind code	A1
Filing date	Mar 22, 2016
Priority date	Mar 23, 2015
Publication date	Sep 29, 2016
Grant date	—

Abstract

A novel display panel that can be used as a reflective display panel in an environment with strong external light and as a self-luminous display panel in a dim environment, for example and that has low power consumption and is highly convenient or reliable is provided. The display panel includes a pixel and a substrate that supports the pixel. The pixel includes a first display element (e.g., a reflective liquid crystal element) that includes a reflective film having an opening as a first conductive film and a second display element (e.g., an organic EL element) that emits light to the opening.

First claim

1 . A display panel comprising:
a pixel comprising:
a first display element comprising a reflective film; and
a second display element; and
a substrate configured to support the pixel, wherein the first display element and the second display element overlap each other, wherein the first display element is configured to control transmission of external light, and the reflective film is configured to reflect the external light, wherein the reflective film has an opening, and wherein the second display element is configured to emit light to the opening.

2 . The display panel according to claim 1 ,
wherein the first display element further comprises a liquid crystal layer between a first conductive film and a second conductive film, wherein the second display element comprises a layer comprising a luminescent material, the layer between a third conductive film and a fourth conductive film, wherein the reflective film serves as the first conductive film, wherein an area of the opening is greater than or equal to 5% and less than or equal to 20% of an area of the first conductive film, and wherein the second display element is configured to emit light to the opening.

3 . The display panel according to claim 1 , wherein the first display element is a reflective liquid crystal element.

4 . The display panel according to claim 1 , further comprising:
a first scan line; and a first signal line intersecting with the first scan line, wherein the pixel further comprises a first pixel circuit, wherein the first pixel circuit is electrically connected to the first scan line and the first signal line, and wherein the first pixel circuit is configured to drive the first display element.

5 . The display panel according to claim 1 , further comprising:
a second scan line; and a second signal line intersecting with the second scan line, wherein the pixel further comprises a second pixel circuit, wherein the second pixel circuit is electrically connected to the second scan line and the second signal line, and wherein the second pixel circuit is configured to drive the second display element.

6 . The display panel according to claim 4 ,
wherein the first pixel circuit comprises a transistor, and wherein the transistor is configured to lower current flowing in an off state more than a transistor comprising amorphous silicon as a semiconductor.

7 . An information processing device comprising:
an arithmetic device; and an input/output device comprising:
a display portion comprising the display panel according to claim 1 ; and
an input portion,
wherein the input portion is configured to detect a position of a pointer and supply positional information which is determined in accordance with the position, wherein the arithmetic device is configured to determine moving speed of the pointer in accordance with the positional information, wherein the arithmetic device is configured to determine contrast or brightness of image information to be generated in accordance with the moving speed of the pointer, and wherein the display portion is configured to display the image information.

8 . The information processing device according to claim 7 , wherein the input portion comprises one selected from the group consisting of a keyboard, a hardware button, a pointing device, a touch sensor, an illuminance sensor, an imaging device, an audio input device, a viewpoint input device and a pose detection device.

9 . A display panel comprising:
a pixel over a substrate, the pixel comprising:
a first display element comprising a reflective film;
a first transistor electrically connected to the first display element;
a second display element; and
a second transistor electrically connected to the second display element,
wherein the first display element and the second display element overlap each other, wherein the first display element is configured to control transmission of external light, and the reflective film is configured to reflect the external light, wherein the reflective film has an opening, and wherein the second display element is configured to emit light to the opening.

10 . The display panel according to claim 9 ,
wherein the first display element further comprises a liquid crystal layer between a first conductive film and a second conductive film, wherein the second display element comprises a layer comprising a luminescent material, the layer between a third conductive film and a fourth conductive film, wherein the reflective film serves as the first conductive film, wherein an area of the opening is greater than or equal to 5% and less than or equal to 20% of an area of the first conductive film, and wherein the second display element is configured to emit light to the opening.

11 . The display panel according to claim 9 , wherein the first display element is a reflective display element.

12 . The display panel according to claim 9 , wherein the first display element is a reflective liquid crystal element.

13 . The display panel according to claim 9 , further comprising:
a first scan line; and a first signal line intersecting with the first scan line, wherein the pixel further comprises a first pixel circuit comprising the first transistor and the second transistor, wherein the first pixel circuit is electrically connected to the first scan line and the first signal line, and wherein the first pixel circuit is configured to drive the first display element.

14 . The display panel according to claim 9 , further comprising:
a second scan line; and a second signal line intersecting with the second scan line, wherein the pixel further comprises a second pixel circuit, wherein the second pixel circuit is electrically connected to the second scan line and the second signal line, and wherein the second pixel circuit is configured to drive the second display element.

15 . An information processing device comprising:
an arithmetic device; and an input/output device comprising:
a display portion comprising the display panel according to claim 9 ; and
an input portion,
wherein the input portion is configured to detect a position of a pointer and supply positional information which is determined in accordance with the position, wherein the arithmetic device is configured to determine moving speed of the pointer in accordance with the positional information, wherein the arithmetic device is configured to determine contrast or brightness of image information to be generated in accordance with the moving speed of the pointer, and wherein the display portion is configured to display the image information.

16 . The information processing device according to claim 15 , wherein the input portion comprises one selected from the group consisting of a keyboard, a hardware button, a pointing device, a touch sensor, an illuminance sensor, an imaging device, an audio input device, a viewpoint input device and a pose detection device.

17 . A display device comprising:
a liquid crystal element; a first transistor electrically connected to the liquid crystal element, the first transistor having a channel region which comprises an oxide semiconductor material; a light emitting element overlapping with the liquid crystal element; a second transistor electrically connected to the light emitting element; and a gate driver circuit for supplying selection signals to at least the first transistor, wherein the gate driver circuit is configured to supply the selection signals at a lower frequency when a

Assignees

• Semiconductor Energy Lab

Inventors

• Yamazaki Shunpei
• Hirakata Yoshiharu
• Ishitani Tetsuji
• Okazaki Kenichi
• Kimura Hajime

Classifications

• G06F3/041

  Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means · CPC title

• G02F2201/44

  Arrangements combining different electro-active layers, e.g. electrochromic, liquid crystal or electroluminescent layers · CPC title

• G06F3/0412

  Digitisers structurally integrated in a display · CPC title

• G02F1/13338

  Input devices, e.g. touch panels · CPC title

• G02F1/136286

  Wiring, e.g. gate line, drain line · CPC title