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Backlight driving circuit, method and display device

A technology for a backlight drive circuit and a drive controller is applied in the field of methods, display devices, and backlight drive circuits, and can solve problems such as flickering of LED lights.

Active Publication Date: 2021-07-09
HISENSE VISUAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Embodiments of the present invention provide a backlight driving circuit, method, and display device to solve the problem in the prior art that the flickering phenomenon occurs due to the fact that the LED light is off when the switching device is turned off

Method used

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  • Backlight driving circuit, method and display device
  • Backlight driving circuit, method and display device
  • Backlight driving circuit, method and display device

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Embodiment Construction

[0054] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0055] It should be understood that the following embodiments do not limit the execution order of each step in the method protected by the present invention. The individual steps of the method according to the invention can be carried out in any possible order and in a cyclic manner without conflicting with each other.

[0056]In describing the present invention, it is to be understood that the terms "central", "longitudinal", "transverse", "length", "upper", "lower", "front", "rear", "vertical", The orientation or positional re...

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Abstract

Embodiments of the present invention provide a backlight driving circuit, a method and a display device. The backlight driving circuit includes an LED lamp, a driving controller, a switching device, an equivalent inductance, a first capacitor and a freewheeling device; the equivalent inductance is the same as that of the LED lamp The equivalent inductance corresponding to the wiring between the first ends of the switching device; the driving controller is used to send a control signal to the switching device, so that the switching device is turned on or off under the control of the control signal; the first capacitor , used to store energy when the switching device is turned on, and to provide power for the LED lamp when the switching device is turned off; the freewheeling device is used to form a freewheeling current with the equivalent inductance and the LED lamp when the switching device is turned off The circuit, so that when the switching device is turned off, there is still current on the LED lamp, that is, the LED lamp can still continue to emit light when the switching device is turned off, and there will be no flickering problem.

Description

technical field [0001] Embodiments of the present invention relate to the field of display technology, and in particular to a backlight driving circuit, method and display device. Background technique [0002] LED lights are widely used in the backlight of liquid crystal display products due to the advantages of long life and high efficiency. Backlight (BackLight) is a light source located behind the liquid crystal display product, and its luminous effect will directly affect the visual effect of the liquid crystal display module (LCM). At present, the dimming of the backlight has been using the digital dimming method of constant current + low-frequency PWM (Pulse Width Modulation, Pulse Width Modulation), that is, the power supply terminal outputs a fixed driving current to the LED lights in the backlight, and adjusts the current in one cycle. The ratio of the time when the LED light is turned on and off is used to adjust the brightness and adjust the luminous effect of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/34
CPCG09G3/3406Y02B20/30
Inventor 韩文涛
Owner HISENSE VISUAL TECH CO LTD
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