PORTABLE TERMINAL AND DISPLAY CONTROL METHOD

• US 20150282071A1
• Filed: 09/25/2013
• Published: 10/01/2015
• Est. Priority Date: 09/25/2012
• Status: Active Grant

• Current Assignee: Kyocera Corporation
• Original Assignee: Kyocera Corporation
• Inventors: Nakaya, Keisuke, Wakisaka, Kenji, Nade, Toshiaki, Miki, Yasuhiro, Takahashi, Tooru
• Granted Patent: US 9,686,749 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06F 1/3212 Monitoring battery levels, e.g. power saving mode being initiated when battery voltage goes below a certain level
• CPC Class Codes: G06F 1/3265 Power saving in display device
• CPC Class Codes: G09G 2320/0646 Modulation of illumination source brightness and image signal correlated to each other
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 2340/145 related to small screens
• CPC Class Codes: G09G 3/3406 Control of illumination source illumination devices structurally associated with liquid crystal cells G02F1/1336
• CPC Class Codes: H04M 1/22 Illumination; Arrangements for improving the visibility of characters on dials
• CPC Class Codes: H04W 52/027 by controlling a display operation or backlight unit
• CPC Class Codes: Y02D 10/00 Energy efficient computing, e.g. low power processors, power management or thermal management
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A mobile phone 10 comprises a display 14 provided with an LED (46) that functions as a backlight, a display driver (42), etc. The display driver has a CABC (Content Adaptive Brightness Control) function to adjust illuminance of the backlight, an image quality of an image to be displayed, etc. based on the image that is displayed on the display 14. If a residual battery quantity of a secondary battery (58) becomes equal to or less that a first threshold value, for example, the CABC function is rendered in an enabled state. Furthermore, if the residual battery quantity becomes equal to or less that a second threshold value, an image parameter such as brightness, contrast, a gamma value, chroma saturation, etc. is changed such that the image that is output to the display driver becomes darker.

Claims

1. A portable terminal, comprising:

a display module;

a backlight provided in the display module;

an adjustment module operable to adjust illuminance of the backlight based on an image that is displayed on the display module; and

a change module operable to change an image parameter so as to darken the image that is displayed on the display module when the adjustment module is operated.

2. The portable terminal according to claim 1, further comprising:

a first drawing module operable to draw a part of the image that is displayed on the display module on a first layer;

a second drawing module operable to draw another part of the image that is displayed on the display module on a second layer; and

a composing module operable to compose images respectively drawn on the first layer and the second layer as the image that is displayed on the display module,

wherein the change module includes a first change module operable to change an image parameter such that the image drawn on the second layer is made darker.

3. The portable terminal according to claim 2, wherein the first change module changes an image parameter of an image that is drawn on the second layer is made darker when an image is drawn on the first layer with an application.

4. The portable terminal according to claim 1, further comprising:

a first drawing module operable to draw a part of the image that is displayed on the display module on a first layer;

a second drawing module operable to draw another part of the image that is displayed on the display module on a second layer; and

a composing module operable to compose images respectively drawn on the first layer and the second layer as the image that is displayed on the display module,

wherein the change module includes a second change module operable to change image parameters of the images that are respectively drawn on the first layer and the second layer.

5. The portable terminal according to claim 1, wherein the image parameter includes at least one of brightness, contrast, a gamma value and chroma saturation.

6. A display control method in a portable terminal that comprises a display module, a backlight provided in the display module and an adjustment module operable to adjust illuminance of the backlight based on an image that is displayed on the display module, a processor performing:

a step of changing an image parameter so as to darken the image that is displayed on the display module when the adjustment module is operated.