SEMICONDUCTOR DEVICE AND PROGRAM

• US 20140152685A1
• Filed: 11/26/2013
• Published: 06/05/2014
• Est. Priority Date: 11/30/2012
• Status: Abandoned Application

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: IWAKI, Yuji
• Application Number:
  US14/090,251
• Publication Number:
  US 20140152685A1
• Time in Patent Office: Days
• US Class Current: 345/589
• CPC Class Codes: G09G 2320/0261 in the context of movement of objects on the screen or movement of the observer relative to the screen
• CPC Class Codes: G09G 2340/0435 Change or adaptation of the frame rate of the video stream
• CPC Class Codes: G09G 2380/14 Electronic books and readers
• CPC Class Codes: G09G 3/2007 Display of intermediate tones
• CPC Class Codes: G09G 5/14 Display of multiple viewports
• CPC Class Codes: G09G 5/32 with means for controlling the display position see provisionally G09G5/42
• CPC Class Codes: G09G 5/34 for rolling or scrolling

Abstract

A semiconductor device having an eye-friendly display function is provided. When a display portion displays text, a difference between a gray level of the text and a gray level of a background of the text is reduced depending on a scrolling speed of a screen of the display portion. In other words, during fast scrolling, text visibility is lowered by bringing the gray level of the text closer to the gray level of the background. This can prevent a user from following the text with eyes at the time of fast scrolling, thereby eliminating unnecessary movement of eye muscles and reducing stimuli to the optic nerve. In this manner, eye strain can be reduced.

Claims

1. A semiconductor device comprising a display portion, wherein when the display portion displays text, a process of reducing a difference between a gray level of the text and a gray level of a background of the text is performed depending on a scrolling speed of a screen of the display portion.

3. The semiconductor device according to claim 1, wherein the display portion comprises a plurality of pixels each including a liquid crystal element.

5. The semiconductor device according to claim 1, wherein the display portion comprises a plurality of pixels each including an electroluminescent element.

7. The semiconductor device according to claim 1, wherein the screen of the display portion comprises electronic paper.

9. The semiconductor device according to claim 1, wherein a refresh rate during still image display by the display portion is lower than a refresh rate during moving image display by the display portion.

2. A semiconductor device comprising a display portion, wherein when the display portion displays text, a size of the text is decreased depending on a scrolling speed of a screen of the display portion.

4. The semiconductor device according to claim 2, wherein the display portion comprises a plurality of pixels each including a liquid crystal element.

6. The semiconductor device according to claim 2, wherein the display portion comprises a plurality of pixels each including an electroluminescent element.

8. The semiconductor device according to claim 2, wherein the screen of the display portion comprises electronic paper.

10. The semiconductor device according to claim 2, wherein a refresh rate during still image display by the display portion is lower than a refresh rate during moving image display by the display portion.

11. A program for controlling a display portion, comprising the steps of:

determining whether to display text on a screen of the display portion;

determining a scrolling speed of the screen of the display portion; and

reducing a difference between a gray level of the text displayed by the display portion and a gray level of a background of the text depending on the scrolling speed.

12. A program for controlling a display portion, comprising the steps of:

determining whether to display text on a screen of the display portion;

determining a scrolling speed of the screen of the display portion; and

decreasing a size of the text displayed by the display portion depending on the scrolling speed.