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Control method, control circuit, backlight integration circuit and terminal equipment

A control method and control circuit technology, applied in the field of communication, can solve the problems of low maximum brightness and low minimum brightness of the screen, and achieve the effects of maintaining current stability, large regulation range, and fine current control

Inactive Publication Date: 2016-08-31
VIVO MOBILE COMM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to provide a control method, control circuit, backlight integrated circuit and terminal equipment, which solves the problem in the prior art that the maximum brightness of the screen is too low or the minimum brightness is too small due to the setting of the external maximum current limit

Method used

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  • Control method, control circuit, backlight integration circuit and terminal equipment
  • Control method, control circuit, backlight integration circuit and terminal equipment
  • Control method, control circuit, backlight integration circuit and terminal equipment

Examples

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Effect test

no. 1 example

[0039] Such as figure 1 As shown, the first embodiment of the present invention provides a control method for a backlight driving circuit, the backlight driving circuit is connected with a backlight light source and a pulse width modulation circuit, including:

[0040] Step 101, acquiring the current brightness of the backlight light source.

[0041] In this step, the backlight light source usually consists of one or more backlight LED (Light Emitting Diode) strings. Then the current brightness of the backlight light source is the brightness of the backlight LED light string, which can also be understood as the brightness of the screen or display screen of the terminal device.

[0042] Step 102, if the current brightness is greater than a preset brightness, control the maximum limit current of the backlight drive circuit to increase to a first limit current, and adjust the duty cycle of the pulse width modulation circuit so that the current brightness is the same as the The ...

no. 2 example

[0060] Such as figure 2 As shown, the second embodiment of the present invention also provides a control method of a backlight driving circuit, the backlight driving circuit is connected with a backlight light source and a pulse width modulation circuit, including:

[0061] Step 201, acquiring the current brightness of the backlight light source.

[0062] In this step, the backlight light source of the backlight driving circuit usually consists of one or more backlight LED (light emitting diode) strings. Then the current brightness of the backlight light source is the brightness of the backlight LED light string, which can also be understood as the brightness of the screen or display screen of the terminal device.

[0063] Step 202, if the current brightness is greater than a preset brightness, control the resistance of the current limiting resistor of the current limiting circuit of the backlight driving circuit to decrease, so that the maximum limited current of the backli...

no. 3 example

[0072] Such as image 3 As shown, the third embodiment of the present invention provides a control circuit of a backlight driving circuit, the backlight driving circuit is connected with the backlight light source and the pulse width modulation circuit, and the control circuit includes:

[0073] An acquisition module 301, configured to acquire the current brightness of the backlight light source;

[0074] The first control module 302 is configured to control the maximum limited current of the backlight drive circuit to increase to a first limited current if the current brightness is greater than a preset brightness, and adjust the duty cycle of the pulse width modulation circuit so that the The current brightness matches the first limited current;

[0075] The second control module 303 is configured to control the maximum limited current of the backlight drive circuit to be reduced to a second limited current if the current brightness is less than or equal to the preset brigh...

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Abstract

The invention provides a control method, a control circuit, a backlight integration circuit and terminal equipment. The control method comprises the following steps of acquiring current brightness of a backlight light source; if the current brightness is greater than preset brightness, making a largest limitation current of a backlight driving circuit increase to a first limitation current and adjusting a duty ratio of a pulse width modulation circuit so that the current brightness matches with the first limitation current; if the current brightness is less than or equal to the preset brightness, making the largest limitation current of the backlight driving circuit reduce to a second limitation current and adjusting the duty ratio of the pulse width modulation circuit so that the current brightness matches with the second limitation current. In embodiments of the invention, through comparing the current brightness of the backlight light source to the preset brightness, according o a comparison result, the largest limitation current of the backlight driving circuit is increased or reduced; simultaneously, the adjusted largest limitation current is used to adjust the duty ratio, the current is maintained to be stable so that the brightness of the backlight light source possesses a large regulation and control scope.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a control method, a control circuit, a backlight integrated circuit and terminal equipment. Background technique [0002] Electronic displays such as liquid crystal displays (LCDs) usually appear in many mobile electronic devices. The brightness of the LCD screen depends on the current of the light-emitting diode (LED) string in the backlight assembly. It usually consists of one or more backlight LED strings. The LED string is It is driven by the backlight driver chip. For the backlight driver chip with pulse width modulation PWM control method, the internal integrated current source is usually adjusted by the pulse width modulation circuit, and the current on the output LED light string is indirectly adjusted to control the brightness of the LED light string. [0003] The pulse width modulation PWM backlight drive circuit usually has a hardware current limiting resistor R...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/34
CPCG09G3/3406
Inventor 徐大清
Owner VIVO MOBILE COMM CO LTD
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