Backlight constant-current driving circuit, switching power supply and display equipment
A constant current drive and circuit technology, applied to static indicators, instruments, etc., can solve problems such as screen scrolling interference
Active Publication Date: 2022-04-29
SHENZHEN SKYWORTH RGB ELECTRONICS CO LTD
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Problems solved by technology
[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a backlight constant current drive circuit, a switching power supply and a display device to solve the problem when the PWM dimming frequency is not synchronized with the field frequency of the screen glass in the existing PWM dimming mode. The resulting scrolling interference on the screen
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[0048] The present invention provides a backlight constant current drive circuit, a switching power supply and a display device. In order to make the purpose, technical solution and effect of the present invention clearer and clearer, the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0049] In the embodiments and claims, unless the article is specifically limited, "a", "an", "the" and "the" may also include plural forms. If there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. Significance or implicitly indicates the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of thes...
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The invention discloses a backlight constant-current driving circuit, a switching power supply and a display device, the backlight constant-current driving circuit is connected with a mainboard and a light bar, and the backlight constant-current driving circuit comprises a constant-current control module and a boost feedback module; the constant current control module is connected with the light bar and is used for detecting the cathode voltage of the light bar; the boost feedback module is connected with the constant current control module and the light bar, and the boost feedback module is used for adjusting the power supply voltage of the light bar according to the cathode voltage of the light bar; and the constant current control module is also connected with the main board and is used for outputting direct current dimming current to the light bar according to the enable signal and the pulse width modulation signal output by the main board. According to the invention, the current flowing through the light bar can be ensured to be stable direct current, and switching alternation does not exist, so that the problem of screen rolling interference caused by desynchrony of the PWM dimming frequency and the screen glass field frequency in the PWM dimming mode is avoided, namely, the problem of screen flash is avoided.
Description
technical field [0001] The invention relates to the technical field of liquid crystal display, in particular to a backlight constant current drive circuit, a switching power supply and a display device. Background technique [0002] Currently, with the development of science and technology, the technology of TV display is changing rapidly, and the current light-emitting diode (Light-Emitting Diode, LED) display device is one of the methods with lower cost and higher luminous efficiency. According to the existing backlight technology, it is basically pulse width modulation (Pulse Width Modulation, PWM) dimming, and its frequency is in the range of 100-20KHz. By adjusting the PWM duty cycle, the backlight current can be adjusted. The larger the duty cycle , the greater the current of the LED light bar, the smaller the duty cycle, the smaller the current of the LED light bar. [0003] However, when the PWM dimming frequency is not synchronized with the field frequency of the s...
Claims
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IPC IPC(8): G09G3/34
CPCG09G3/3406G09G3/3413
Inventor 李亚伟胡向峰黄德强盘桥富杨文祥周建华
Owner SHENZHEN SKYWORTH RGB ELECTRONICS CO LTD