Display Brightness Correction for Uniformity in Thinned Backlights
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Solution Overview
Problem
Current display apparatuses with LCD panels face challenges in achieving uniform brightness due to the non-uniform brightness distribution from the backlight assembly, which is exacerbated by the thickness reduction of the backlight unit, leading to distorted images and increased manufacturing costs.
Innovation Solution
A display apparatus with a brightness correcting unit that uses brightness correction information determined based on the brightness of each area of the image displayed on the panel, incorporating a backlight assembly with a light source unit, reflecting sheet, diffusing plate, and optical sheet assembly, and storing unit to compensate for brightness differences and non-uniform distributions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the thickness of the backlight assembly is reduced to achieve a thinner display apparatus, then the overall thickness is reduced, but the brightness uniformity deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing brightness correction information for different display areas before actual image display. The brightness correction information is determined in advance based on the non-uniform brightness distribution characteristics of the thinned backlight assembly, allowing the image processing unit to compensate for brightness variations without requiring physical modification of the backlight structure.
Solution Approach 2:
The patent changes the parameter of brightness distribution by using brightness correction information that adjusts the luminance of different display areas. The image processing unit modifies the image data by applying brightness correction values corresponding to different regions, effectively transforming the non-uniform brightness output into a uniform perceived brightness without physically altering the backlight assembly thickness.
2Length of moving object
If the distance between components in the backlight assembly is decreased to reduce thickness, then the overall structure is compacted, but the brightness variation increases
Solution Approach 1:
The patent introduces an intermediary element - the brightness correction information - that mediates between the thinned backlight assembly's non-uniform light output and the desired uniform image display. The image processing unit uses this intermediary data to adjust brightness in different areas, compensating for the increased brightness variation caused by reduced component spacing without requiring increased component density.
3Illumination intensity
If the number of light sources is increased to reduce brightness variation, then the brightness uniformity is improved, but the manufacturing cost and complexity increase
Solution Approach 1:
The patent uses copying by creating a virtual model of the brightness distribution through brightness correction information that is stored in a storage unit. Instead of physically adding more light sources, the system copies and applies correction data corresponding to different display areas, allowing a single light source to achieve uniform brightness output through digital compensation rather than physical multiplication of components.
4Illumination intensity
If a diffusing plate with high diffusing efficiency is used to reduce brightness variation, then the brightness uniformity is improved, but the light emitting efficiency deteriorates
Solution Approach 1:
The patent replaces the mechanical/optical system approach (using physical diffusing plates) with an electronic/digital system approach. Instead of relying on physical diffusing materials to redistribute light, the system uses the image processing unit to digitally adjust brightness based on stored correction information, eliminating the need for thick diffusing plates and their associated light loss while achieving the same uniformity goal.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively corrects brightness differences and non-uniform distributions, ensuring a uniform image output without distorting the image, even when the backlight assembly is thinned, thereby reducing manufacturing costs and maintaining image quality.
Implementation Method 1
a reflecting sheet which reflects a light which is emitted from the light source unit
Implementation Method 2
a diffusing plate which diffuses the light which is emitted from the light source unit
Data Source
AI summary
A display apparatus and a brightness correcting method thereof are provided. The display apparatus includes: a display panel which displays an image; a backlight assembly which includes at least one light source unit which supplies a light to the display panel; and a brightness correcting unit that corrects a brightness of the image using brightness correction information which is determined based on the brightness of each area of the image.