1D Edge Light Source Array for Thin Panel Local Dimming
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Solution Overview
Problem
The use of a two-dimensional (2D) light source array in panel display devices increases the volume and thickness, making it advantageous to implement a local dimming function with reduced volume.
Innovation Solution
A one-dimensional (1D) light source array is used to illuminate the display panel from its edge, with backlight values determined based on subzones to achieve local dimming, mitigating undesirable brightness changes and improving image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a two-dimensional (2D) light source array is used to achieve local dimming function, then high dynamic contrast and low power consumption are achieved, but the volume and thickness of the panel display device increase
Solution Approach 1:
The patent transitions from a two-dimensional light source array to a one-dimensional light source array by changing the spatial arrangement of light sources from a grid pattern to a linear edge arrangement. This dimensional reduction allows the backlight device to be positioned at the edge of the display panel rather than requiring space behind the entire panel, thereby reducing device volume while maintaining local dimming capability through selective illumination of display zones
2Illumination intensity
If a two-dimensional (2D) light source array is used to achieve local dimming function, then high dynamic contrast and low power consumption are achieved, but the thickness of the panel display device increases
Solution Approach 1:
The patent transitions from a two-dimensional light source array to a one-dimensional light source array by changing the spatial arrangement of light sources from a grid pattern to a linear edge arrangement. This dimensional reduction allows the backlight device to be positioned at the edge of the display panel rather than requiring space behind the entire panel, thereby reducing device volume while maintaining local dimming capability through selective illumination of display zones
Solution Approach 2:
The patent extracts the light sources from the traditional position behind the display panel and relocates them to the edge of the panel. This extraction allows the backlight device to illuminate the display area from the side rather than requiring the full panel area behind it, reducing the thickness requirement while enabling zone-based illumination control for local dimming
Data Source
AI summary
A display device includes a backlight device, and a backlight control circuit. The backlight device includes a plurality of light sources configured to illuminate a plurality of zones of a display panel, respectively. The zones are aligned in a first direction, and each zone includes a plurality of subzones aligned in a second direction perpendicular to the first direction. The backlight control circuit is configured to receive an input image and determine a backlight value for a target light source of the light sources, the target light source corresponding to a target zone of the plurality of zones. Determining the backlight value for the target light source includes: determining local brightness values of respective subzones of the target zone based on the input image; and determining the backlight value for the target light source based on the local brightness values of the subzones of the target zone.