Backlight control signal generating circuit and method and liquid crystal display equipment

Abstract

The invention discloses a backlight control signal generating circuit, a backlight control signal generating method and liquid crystal display equipment, and relates to the technical field of liquid crystal display. The circuit comprises a switching circuit and different PWM (pulse-width modulation) backlight control signal conversion circuits, wherein the switching circuit is switched to the different PWM backlight control signal conversion circuits in accordance with indicating signals generated from different data intervals of backlight data; and the different PWM backlight control signal conversion circuits are various different combined circuits which are formed by a plurality of duty ratio conversion circuit and a plurality of current setting circuits. According to the embodiment, the different backlight data intervals can be set in accordance with different gray scale display demands of bright and dark scenes in an image, and meanwhile, current values of PWM backlight control signals corresponding to the different backlight data intervals are variable, so that backlight control signals at required backlight brightness are correspondingly generated, and a picture contrast ratio is improved.

Description

technical field [0001] The present application relates to the technical field of liquid crystal display, in particular to a backlight control signal generation circuit, method and liquid crystal display device. Background technique [0002] Existing LCD devices usually use multi-zone dynamic backlight modulation technology to control the brightness of the backlight. Specifically, the entire backlight matrix is ​​divided into at least one zone. The backlight data of the partition is sent to the backlight processing unit, and then the backlight data is converted into a PWM backlight control signal, so as to control the backlight drive unit to control the brightness of the backlight in the backlight partition. In this way, the high-grayscale image part corresponds to a higher backlight brightness, and the low-grayscale image part corresponds to a lower backlight brightness, thereby improving the contrast between light and dark of the picture. [0003] However, in the related a...

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Problems solved by technology

[0007] The present application provides a circuit, an integrated chip, a method and a liquid crystal display device for generating a backlight control signal from backlight data in a liquid crystal display device for backlight dynamic control, which can solve the problem that the brightness of the backlight cannot be continuously improved under high-brightness images in the above-mentioned related technologies. question

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