Liquid Crystal Display Backlight Zone Control for Halo Flicker
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Solution Overview
Problem
Liquid crystal display devices suffer from a point diffusion effect causing a halo that flickers with a constantly changing size as display content moves, leading to a suboptimal viewing experience.
Innovation Solution
A method and device for controlling a liquid crystal display device by determining the state of each pixel based on inputted image data, identifying a destination zone with both bright and dark pixels, obtaining a halo region, and generating control signals to adjust adjacent backlight zones, ensuring a constant halo area by compensating for its size and brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the backlight device uses Micro LEDs to provide high dynamic range and optimized power consumption, then the display performance is improved, but the point diffusion effect causes a halo that flickers with changing size leading to suboptimal viewing experience
Solution Approach 1:
The backlight device is divided into multiple independently controllable backlight zones corresponding to different display zones. Each backlight zone can be adjusted separately based on the content being displayed, allowing precise control over where light is emitted and how it is distributed, thereby reducing the halo effect caused by point diffusion while maintaining overall display performance.
Solution Approach 2:
Different backlight zones are assigned different brightness levels and control strategies based on local display requirements. The processing circuit analyzes the image data and adjusts each backlight zone individually, applying local quality adjustments to compensate for the point diffusion effect in specific areas while maintaining high dynamic range overall.
2Object-affected harmful factors
If the backlight zones are adjusted to compensate for the halo effect, then the viewing experience is improved, but the complexity of the control system increases
Solution Approach 1:
The processing circuit performs preliminary analysis of the image data to identify display zones containing both bright and dark pixels before generating control signals. This preliminary action allows the system to pre-determine which backlight zones need adjustment, simplifying the overall control process by organizing operations in a logical sequence rather than requiring complex real-time calculations.
Solution Approach 2:
The system uses the existing image data that is already being processed for display to automatically determine the halo compensation strategy. The processing circuit leverages the pixel state information (bright or dark) that is already available, making the control system self-sufficient and reducing the need for additional sensors or external control inputs, thereby managing complexity.
3Object-affected harmful factors
If the halo region is identified and compensated by adjusting adjacent backlight zones, then the display effect is improved, but the processing time and computational load increase
Solution Approach 1:
The system identifies only the specific halo region within the destination zone (pixels in dark state surrounded by bright pixels) rather than processing the entire display panel. By focusing computational resources only on the affected areas and their adjacent backlight zones, the system achieves effective halo compensation while minimizing processing time and computational load.
Solution Approach 2:
The display panel is divided into multiple display zones, and the backlight device is divided into corresponding backlight zones. This segmentation allows the processing circuit to independently analyze and compensate for halo effects in each destination zone, processing smaller regions separately rather than the entire display at once, thereby reducing overall processing time while maintaining comprehensive coverage.
Data Source
AI summary
The embodiments of this disclosure disclose a liquid crystal display device and a control method thereof, a head-mounted display device and a computer-readable storage medium. The control method of the liquid crystal display device comprises: obtaining a state of each pixel in the display panel based on inputted image data; obtaining a display zone comprising both pixels in a bright state and pixels in a dark state based on the state of each pixel in the display panel, and using the obtained display zone as a destination zone; obtaining a halo region based on the state of the pixels in the destination zone, wherein the halo region comprises pixels in the dark state in the destination zone; generating a first control signal based on the halo region; and controlling based on the first control signal a backlight zone to be adjusted.