Backlight Timing Delay for LCD Luminance Synchronization
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Solution Overview
Problem
Conventional image display devices using local dimming technology face challenges in synchronizing the timing of light emission from backlight regions and voltage application to liquid crystal panel pixels, leading to potential mismatches in image display and luminance, which affect image quality.
Innovation Solution
The image display method involves a controller that sequentially adjusts light emission intensity in backlight regions and voltage levels on liquid crystal panel pixels, with a predetermined timing delay between these operations to ensure synchronized control across matrix-configured areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If light emission from backlight regions and voltage application to liquid crystal panel pixels are performed simultaneously, then operation speed is improved, but timing synchronization between light emission and pixel voltage application deteriorates, causing mismatches in image display and luminance
Solution Approach 1:
The patent applies preliminary action by delaying the start timing of light emission from the backlight relative to the voltage application to the liquid crystal panel pixels. Specifically, the control device sets the light emission timing to occur after a predetermined interval following the pixel voltage application start timing. This preliminary timing adjustment ensures that the liquid crystal molecules have sufficient time to reach their stable state before the backlight illuminates, thereby achieving proper synchronization between the displayed image and the actual luminance output.
2Manufacturing precision
If sequential control of backlight regions and liquid crystal panel pixels is implemented, then timing synchronization is improved, but processing time increases
Solution Approach 1:
The patent applies segmentation by dividing the backlight into multiple independently controllable light-emitting regions and the liquid crystal panel into multiple pixel regions, with each region processed sequentially. The control device controls light emission from each light-emitting region in sequence according to its corresponding pixel region, allowing timing synchronization to be achieved for each segment while maintaining overall system efficiency through parallel processing capability across different regions.
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 approach improves image quality by ensuring that the image displayed on the liquid crystal panel matches the luminance under each backlight region, enhancing the overall display performance.
Implementation Method 1
a second operation to apply voltages to the pixels at respective levels in accordance with the frame image data is performed sequentially with respect to each of the second areas
Data Source
AI summary
In an image display method, a backlight is divided into first areas in a first direction. Each of the first areas includes light-emitting regions. A liquid crystal panel is divided into second areas in the first direction. In the method, a first operation to cause light to be emitted from the light-emitting regions at respective intensity in accordance with frame image data is performed sequentially with respect to each of the first areas. Further, a second operation to apply voltages to the pixels at respective levels in accordance with the frame image data is performed sequentially with respect to each of the second areas. A timing at which the first operation with respect to each of the first areas is started is delayed from a timing at which the second operation with respect to a corresponding one of the second areas is started by a predetermined interval.