ELECTRONIC DEVICE AND ELECTRONIC SYSTEM

• US 20110216043A1
• Filed: 02/28/2011
• Published: 09/08/2011
• Est. Priority Date: 03/08/2010
• Status: Abandoned Application

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Kurokawa, Yoshiyuki, Ikeda, Takayuki, Tamura, Hikaru
• Application Number:
  US13/036,157
• Publication Number:
  US 20110216043A1
• Time in Patent Office: Days
• US Class Current: 345/175
• CPC Class Codes: G02F 1/13318 Circuits comprising a photodetector
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G06F 1/3203 Power management, i.e. event-based initiation of a power-saving mode
• CPC Class Codes: G06F 1/3265 Power saving in display device
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/042 by opto-electronic means
• CPC Class Codes: G06F 3/04886 by partitioning the display area of the touch-screen or the surface of the digitising tablet into independently controllable areas, e.g. virtual keyboards or menus
• CPC Class Codes: G09G 2310/04 Partial updating of the display screen
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 2330/022 in absence of operation, e.g. no data being entered during a predetermined time
• CPC Class Codes: G09G 2340/0435 Change or adaptation of the frame rate of the video stream
• CPC Class Codes: G09G 2354/00 Aspects of interface with display user
• CPC Class Codes: Y02D 10/00 Energy efficient computing, e.g. low power processors, power management or thermal management

Abstract

To provide a display device in which a moving-image mode and a still-image mode which consumes less power can be switched on one screen automatically or by operation by a user on one display screen. The display device includes a display panel including a photosensor for detecting touch input by a user; a display control circuit for displaying a keyboard on part of the display screen; and a storage medium storing a program (an application program) for controlling power supplied to a still-image area of the displayed keyboard. The program for controlling power supplied to the still-image area enables power saving.

Claims

1. A display device comprising:

a display panel including a photosensor configured to detect touch input performed on a display screen, in a pixel portion;

a display control circuit configured to display an operation button on part of the display screen in accordance with a detection by the photosensor; and

a storage medium configured to store a program for controlling power supplied to a still-image area of the displayed operation button.

2. The display device according to claim 1,

wherein the program divides the display screen into a moving-image display area and a still-image display area, and

wherein display is performed on the still-image display area with less power consumption than on the moving-image display area.

3. The display device according to claim 1, wherein when touch input is performed while a first picture is displayed on the display screen, a second picture is displayed on the display screen.

4. The display device according to claim 1, wherein the display panel is a transmissive liquid crystal display panel.

5. The display device according to claim 1, wherein the display panel is a reflective liquid crystal display panel.

6. The display device according to claim 1, wherein the operation button is a keyboard or an icon.

7. A display device comprising:

a display panel including a photosensor configured to detect a shadow casted on a display screen without touch, in a pixel portion;

a display control circuit configured to display an operation button on part of the display screen in accordance with a detection by the photosensor; and

a storage medium configured to store a program for controlling power supplied to a still-image area of the displayed operation button.

8. The display device according to claim 7,

wherein the program divides the display screen into a moving-image display area and a still-image display area, and

wherein display is performed on the still-image display area with less power consumption than on the moving-image display area.

9. The display device according to claim 7, wherein when the shadow is detected while a first picture is displayed on the display screen, a second picture is displayed on the display screen.

10. The display device according to claim 7, wherein the display panel is a transmissive liquid crystal display panel.

11. The display device according to claim 7, wherein the display panel is a reflective liquid crystal display panel.

12. The display device according to claim 7, wherein the operation button is a keyboard or an icon.

13. The display device according to claim 7, wherein the shadow is casted with a finger held over the screen.