# US 2014/0152685 A1 · Semiconductor device and program

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- Number: US 2014/0152685 A1
- Document ID: US20140152685A1
- Status: Published application
- Kind: A1
- Application number: 14/090,251
- Filed: 2013-11-26
- Published: 2014-06-05
- Earliest claimed: 2012-11-30
- Assignees: Semiconductor Energy Laboratory Co., Ltd.
- Applicants: Semiconductor Energy Laboratory Co., Ltd.
- Inventors: Yuji IWAKI
- Web page: https://patentgrep.com/patent/US20140152685A1

## CPC

- G09G 5/14: Display of multiple viewports
- G09G 3/2007: {Display of intermediate tones}
- G09G 5/32: with means for controlling the display position {(see provisionally G09G5/42)}
- G09G 5/34: for rolling or scrolling
- G09G 2320/0261: in the context of movement of objects on the screen or movement of the observer relative to the screen
- G09G 2340/0435: Change or adaptation of the frame rate of the video stream
- G09G 2380/14: Electronic books and readers
- G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00)

## 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

### Claim 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.

### Claim 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.

### Claim 3 (depends on 1)

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

### Claim 4 (depends on 2)

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

### Claim 5 (depends on 1)

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

### Claim 6 (depends on 2)

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

### Claim 7 (depends on 1)

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

### Claim 8 (depends on 2)

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

### Claim 9 (depends on 1)

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.

### Claim 10 (depends on 2)

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.

### Claim 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.

### Claim 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.