Display Panel Driving Circuit Edge Processing for HDR Clarity
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Solution Overview
Problem
Display panels with multiple pixel array layers face the dual cell local dimming side view object invisible issue, where objects appear invisible when viewed obliquely due to inadequate light distribution, affecting the high dynamic range (HDR) effect.
Innovation Solution
A driving circuit with a calculation circuit and an edge processing circuit that converts original image frame data into suitable data for multiple pixel array layers, performing edge detection to adjust the gray levels of adjacent pixels, thereby enhancing light distribution and clarity of side views.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a direct-lit backlight source with high resolution is used to achieve better HDR effect, then the local dimming performance is improved, but the thickness of the backlight source increases and the cost increases
Solution Approach 1:
The patent replaces the physical mechanical structure of high-resolution direct-lit backlight (which would require many individual LED elements and thus increase thickness) with a software-based edge detection and gray level adjustment algorithm. The edge processing circuit detects edges in the image data and adjusts gray levels of adjacent pixels, achieving the same visual effect of improved HDR without increasing backlight thickness.
Solution Approach 2:
Instead of physically creating a high-resolution backlight array, the patent creates a digital copy or representation of edge information from the image data, processes this copied information through edge detection, and applies the processed data to adjust pixel gray levels. This virtual processing achieves the HDR effect without the physical overhead of a high-resolution backlight structure.
2Illumination intensity
If more light-emitting diodes are used in the backlight array to improve resolution, then the HDR effect is improved, but the cost of the direct-lit backlight increases
Solution Approach 1:
The patent substitutes expensive hardware (additional light-emitting diodes) with inexpensive software processing (edge detection and gray level adjustment algorithms). The edge processing circuit processes image data to identify edges and adjusts adjacent pixel gray levels, achieving HDR effect without purchasing and installing additional LED elements, thereby significantly reducing cost.
Solution Approach 2:
The system uses the existing image data and existing pixel structure to achieve HDR effect. The edge processing circuit leverages the information already present in the image data and the existing pixel array, processing this information to enhance the display without requiring additional physical components or materials.
3Illumination intensity
If multiple pixel array layers are used to achieve local dimming, then the HDR effect is improved, but objects become invisible when viewed obliquely due to inadequate light distribution
Solution Approach 1:
The edge processing circuit performs feedback processing by detecting edges in the image data and using this detected information to adjust the gray levels of adjacent pixels. This feedback mechanism ensures that light distribution is optimized based on the actual image content, improving visibility of objects at oblique angles while maintaining HDR effect.
Solution Approach 2:
The patent applies different processing to different regions of the image based on edge detection results. Pixels adjacent to detected edges receive gray level adjustments to improve light distribution and object visibility, while other pixels maintain their original characteristics. This localized processing ensures HDR effect is preserved while fixing the oblique viewing issue.
Data Source
AI summary
The invention provides a driving circuit of a display panel and an operation method thereof. The driving circuit includes a calculation circuit and an edge processing circuit. The calculation circuit converts original image frame data into first image frame data for driving a first pixel array layer and second image frame data for driving a second pixel array layer. The edge processing circuit converts the second image frame data into third image frame data. The edge processing circuit performs an edge detection on a current pixel in the second image frame data to determine whether the current pixel belongs to an image edge. The edge processing circuit determines whether to adjust a gray level of an adjacent pixel in the second image frame data as the gray level of the adjacent pixel in the third image frame data according to a result of the edge detection.