发明名称 |
Backlight driving circuit and backlight driving circuit |
摘要 |
The present invention discloses a backlight driving circuit applied to an electronic device. The backlight driving circuit includes a light-emitting diode unit, a photosensitive element, and a control circuit. The light-emitting diode unit has an anode terminal and a cathode terminal. The photosensitive element is coupled between the cathode terminal of the light-emitting diode unit and a ground, wherein the resistance of the photosensitive element changes with the ambient light level around the electronic device. The control circuit includes a sensing terminal and an output terminal. The sensing terminal receives a feedback voltage. The output terminal provides a power source to the anode terminal of the light-emitting diode unit according to the feedback voltage to control the luminance of the light-emitting diode unit, wherein the feedback voltage is decided by the resistance of the photosensitive element. |
申请公布号 |
US9131580(B2) |
申请公布日期 |
2015.09.08 |
申请号 |
US201313772919 |
申请日期 |
2013.02.21 |
申请人 |
WISTRON CORP. |
发明人 |
Lee Hsin-Chun;Chen Peilin;Chang Shou-Jung |
分类号 |
H05B37/02;H05B33/08;G09G3/00 |
主分类号 |
H05B37/02 |
代理机构 |
Birch, Stewart, Kolasch & Birch, LLP |
代理人 |
Birch, Stewart, Kolasch & Birch, LLP |
主权项 |
1. A backlight driving circuit, applied to an electronic device, comprising:
a light-emitting diode unit, having an anode terminal and a cathode terminal, wherein the light-emitting diode unit comprises at least one light-emitting diode; a photosensitive element, arranged to be coupled between the cathode terminal of the light-emitting diode unit and a ground, wherein the resistance of the photosensitive element changes with an ambient light level around the electronic device; and a control circuit, comprises:
a sensing terminal, arranged to receive a feedback voltage; andan output terminal, arranged to provide a power source to the anode terminal of the light-emitting diode unit according to the feedback voltage to control the luminance of the light-emitting diode unit, wherein the feedback voltage is decided by the resistance of the photosensitive element. |
地址 |
New Taipei TW |