LCD Backlight Luminance Control via Ambient Light Segmentation
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Solution Overview
Problem
Large liquid crystal displays face issues with image quality due to inability to locally adjust backlight luminance in regions exposed to varying ambient light intensities, leading to poor display effects.
Innovation Solution
A liquid crystal display with a backlight source comprising light emitting pixels, photosensitive detectors in the frame region, and a light intensity estimation module to determine and adjust luminance of each pixel based on ambient light intensity distribution, allowing for localized adjustments to match varying light conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single optical sensor is used to detect ambient light intensity, then the overall display luminance can be adjusted, but the local light intensity variations across the screen cannot be compensated
Solution Approach 1:
The patent divides the backlight source into multiple independently controllable light emitting pixels arranged in a matrix, and places multiple photosensitive detectors at different positions (including edge centers and four corners) to detect local light intensities. This segmentation enables independent adjustment of backlight luminance in different screen regions, resolving the contradiction between overall adaptability and local image quality.
2Area of stationary object
If the screen size is increased to provide larger display area, then the coverage is improved, but the ability to locally adjust backlight luminance is reduced
Solution Approach 1:
The patent maintains local adjustment capability on large screens by segmenting the backlight source into multiple independently controllable pixels and using multiple photosensitive detectors positioned at key locations (edge centers and corners). This allows each region of the large screen to be independently adjusted according to local ambient light conditions, preserving adaptability while increasing display area.
3Measurement precision
If multiple photosensitive detectors are distributed across the frame region, then local light intensity detection is improved, but the device complexity increases
Solution Approach 1:
The patent strategically places photosensitive detectors at specific key positions (edge centers and four corners of the frame region) rather than uniformly distributing them. This local quality approach ensures accurate detection of local light intensity variations at critical positions while minimizing the total number of detectors, thus balancing measurement precision with device complexity.
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
This solution enables improved display quality by dynamically adjusting backlight luminance to match ambient light conditions, reducing the impact of varying light intensities on the display effect across the screen.
Implementation Method 1
a plurality of photosensitive detectors located in the frame region and a light intensity estimation module. The photosensitive detectors are used for detecting light intensities of the ambient light
Data Source
AI summary
This disclosure relates to a liquid crystal display and a display device. A plurality of photosensitive detectors is arranged in the frame region of the liquid crystal display panel. Light intensity distribution in the display region is estimated by a light intensity estimation module based on the light intensity detected by each photosensitive detector. Light intensity in a position corresponding to each light emitting pixel of the backlight source is determined based on the light intensity distribution in the display region estimated by the light intensity estimation module. Depending on the determined light intensity in a position corresponding to each light emitting pixel of the backlight source, luminance of the light emitting pixel in this corresponding position is controlled by a backlight driving circuit.