Edge-Lit Backlight Luminance Control via Lookup Tables
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Solution Overview
Problem
Existing display devices with edge-lit light sources face challenges in independently controlling luminance, leading to complex luminance distribution and increased power consumption, making it difficult to apply existing technologies effectively.
Innovation Solution
A display device with an image display panel and an edge-lit light source, where a controller uses lookup tables to independently control the luminance of each light source based on input signals and light intensity distributions, allowing for efficient light quantity computation and reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If independent control of each light source is implemented in an edge-lit light source, then luminance distribution can be optimized, but the luminance distribution becomes complex and computation requirements increase
Solution Approach 1:
The patent pre-calculates and stores light intensity distribution data for each light source position in lookup tables before operation. During actual operation, the controller simply retrieves and combines these pre-stored patterns rather than performing complex real-time calculations, thus achieving optimized luminance distribution while keeping computational complexity low.
Solution Approach 2:
The patent divides the backlight into multiple independently controllable light sources arranged at different positions. Each light source has its own lookup table storing local light intensity distribution characteristics. By independently adjusting individual light sources based on local requirements, the system achieves overall luminance optimization without needing to compute the entire complex distribution simultaneously.
2Ease of operation
If existing technologies are applied to edge-lit light sources with multiple independently controlled light sources, then luminance control is achieved, but the complex luminance distribution makes the technology inapplicable
Solution Approach 1:
The patent segments the backlight system into multiple independent light source units, each with its own control channel and lookup table. This segmentation allows the system to handle the complexity of edge-lit configurations by treating each light source separately, making the technology adaptable to edge-lit light sources while maintaining ease of luminance control through modular independent management.
3Measurement precision
If high resolution is increased, then display properties are improved, but aperture ratio decreases and backlight power consumption increases
Solution Approach 1:
The patent changes the control parameters of the backlight system by dividing it into multiple independently controllable light sources with different intensity levels. By adjusting the intensity parameters of individual light sources based on local display requirements, the system maintains high luminance where needed for high-resolution display while reducing overall power consumption through selective dimming of less critical areas.
Data Source
AI summary
According to an aspect, a display device includes: an image display panel; and a planar light source including a light guide plate and an edge-lit light source, the light guide plate illuminating the image display panel from a back side, the edge-lit light source including a plurality of light sources arranged facing a plane of incidence; and a controller that controls luminance of each of the light sources independently. The controller stores therein, as lookup tables for the respective light sources, information on light intensity distributions of light that is incident on the light guide plate from the respective light sources and is emitted to a plane of the image display panel from the light guide plate, and controls a light quantity of each of the light sources based on information on an input signal of an image, and on the lookup tables.