Backlight control of display device

By using backlight control circuits and filter technology in display devices, controlling the brightness of the light source based on the maximum pixel brightness and local average level of the image, the problem of uneven display and flickering of bright but small foreground objects in the prior art is solved, and better image quality and stability are achieved.

CN119694266APending Publication Date: 2025-03-25SYNAPTICS INC
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Patent Information

Application Number
CN202411323480.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2024-03-26
Filing Date
2024-09-23
Publication Date
2025-03-25

AI Technical Summary

Technical Problem

Existing backlighting systems tend to cause uneven brightness and flicker when displaying bright but small foreground objects, especially when the foreground objects move between different light source areas.

Method used

By introducing a backlight control circuit into the display device, processing the target portion of the input image using filter technology, generating the filtered image portion, and controlling the brightness level of each light source based on the maximum pixel brightness level and the local average image level (APL) of the filtered image portion.

Benefits of technology

Effectively reduces the flickering phenomenon of bright but small foreground objects when moving, while ensuring the image brightness uniformity and contrast improvement.

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Abstract

A display device includes a backlight device and a backlight control circuit. The backlight device includes a plurality of light sources configured to illuminate the display panel. The backlight control circuit is configured to apply a filter to a target portion of an input image to generate a filtered image portion. A target portion of the input image is displayed in a corresponding area of the display panel illuminated by a target light source of the plurality of light sources. The backlight control circuit is further configured to control a brightness level of the target light source based on a maximum pixel brightness level of the filtered image portion and a local average image level (APL) of the filtered image portion.
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