Automatic contrast compensation apparatus for an organic light-emitting diode display

• US 20040201985A1
• Filed: 01/06/2004
• Published: 10/14/2004
• Est. Priority Date: 04/08/2003
• Status: Abandoned Application

• Current Assignee: Richtek Technology Corporation (MediaTek, Inc.)
• Original Assignee: Richtek Technology Corporation (MediaTek, Inc.)
• Inventors: Liu, Jing-Meng, Kung, Nien-Hui, Chuang, Chao-Hsuan, Wang, Der-Jiunn
• Application Number:
  US10/751,425
• Publication Number:
  US 20040201985A1
• Time in Patent Office: Days
• US Class Current: 362/183
• CPC Class Codes: G01J 1/4204 with determination of ambient light solar light G01J2001/4266
• CPC Class Codes: G09G 2320/0626 for control of overall brightness
• CPC Class Codes: G09G 2320/066 for control of contrast
• CPC Class Codes: G09G 2360/144 the light being ambient light
• CPC Class Codes: G09G 3/20 for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
• CPC Class Codes: G09G 3/3208 organic, e.g. using organic light-emitting diodes [OLED]

Abstract

An automatic contrast compensation apparatus for an OLED display comprises a photo detector, an OLED driver, a safety clamping circuit, and a solar cell. When the intensity of environmental light increased, the photo detector sends a signal to the OLED driver to increase the brightness of the OLED display and for which, the solar cell provides the extra power for the OLED driver to improve the displaying performance of the OLED display in a power-saving manner. The safety clamping circuit prevents the OLED driver from over-current from the solar cell.

Claims

1. An automatic contrast compensation apparatus for an OLED display, comprising:

a photo detector for detecting environmental light intensity;

an OLED driver for receiving a signal from said photo detector to increase brightness of said OLED display when said environmental light intensity increases;

a solar cell for providing power for said OLED driver to increase brightness of said OLED display; and

a safety clamping circuit connected between said solar cell and OLED driver for over-current protection of said OLED driver in blaze.

2. An automatic contrast compensation apparatus for an OLED display, comprising:

an OLED driver for driving said OLED display;

a solar cell for providing power for said OLED driver to increase brightness of said OLED display when environmental light intensity increases;

a safety clamping circuit connected between said solar cell and OLED driver for over-current protection of said OLED driver in blaze; and

a switch for controlling said OLED driver to increase brightness of said OLED display.

3. An automatic contrast compensation apparatus for an OLED display, comprising:

an OLED driver for driving said OLED display;

a solar cell for providing power for said OLED driver to increase brightness of said OLED display when environmental light intensity increases;

a switch for controlling said OLED driver to increase brightness of said OLED display.