Backlight Unit Fault Compensation via Movable LEDs
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Solution Overview
Problem
Display devices face issues with non-uniform light distribution due to faulty light sources in the backlight unit, leading to uneven image quality as some pixels appear brighter or darker than intended.
Innovation Solution
The method involves detecting faulty light sources and using actuators to move nearest neighbor light sources closer to the faulty ones and adjust their intensity to compensate for the faulty light, ensuring uniform light distribution across the screen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a faulty light source is detected and compensated by adjusting nearby LEDs, then image quality is improved, but device complexity increases due to additional actuators and control mechanisms
Solution Approach 1:
The backlight unit performs self-diagnosis and self-repair by automatically detecting faulty light sources and compensating for their failure. The system uses a camera to detect dark pixels, identifies failed LEDs, and automatically adjusts working LEDs to compensate, eliminating the need for external intervention or complex manual repair mechanisms.
Solution Approach 2:
The system changes operational parameters of working light sources dynamically. When a faulty LED is detected, the controller increases the drive current or duty cycle of neighboring working LEDs to compensate for the lost light output, thereby maintaining uniform illumination without physical restructuring.
2Illumination intensity
If the intensity of working light sources is increased to compensate for faulty sources, then light distribution uniformity is improved, but energy consumption increases
Solution Approach 1:
Instead of uniformly increasing the intensity of all light sources, the system applies intensity compensation only to working LEDs adjacent to detected faulty sources. This localized approach maintains uniformity in affected regions while minimizing overall energy consumption by leaving other LEDs at normal operating levels.
Solution Approach 2:
The system applies partial compensation by adjusting only the necessary subset of working LEDs near faulty sources rather than all LEDs. This selective adjustment achieves the required uniformity while avoiding excessive energy consumption that would result from globally increasing all light source intensities.
Data Source
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AI summary
There is provided a method of controlling a backlight unit (31) of a display device (30). The backlight unit (31) comprises a plurality of light sources for illuminating a screen (43) of the display device (30). The method comprises detecting a faulty light source (32) amongst the plurality of light sources. In response thereto, at least one other light source (33) is moved from a first position to a second position to allow the at least one other light source (33) to compensate for the faulty light source (32). A backlight unit (31) having a plurality of controllably movable light sources is provided for performing the method. A system is also provided for controlling the location of the controllably movable light sources in the backlight unit (31) of the display device (30).