LED Display Compensation Using Panel and Pixel Calibration
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Solution Overview
Problem
Existing COB packaging processes for LED display panels result in inconsistent ink colors and unsatisfactory brightness and chromaticity compensation, leading to persistent color blocks and uneven display images.
Innovation Solution
A display apparatus and method that includes a driver circuit to perform first and second compensation operations based on light panel and pixel data, adjusting signal gain values and brightness/chromaticity data to enhance uniformity, using a host system and camera for calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If COB packaging process is used for LED display panels, then protection and contrast are improved, but ink color consistency deteriorates
Solution Approach 1:
The patent segments the display screen into multiple light boxes, each light box into multiple light panels, and each light panel into multiple display pixels. This hierarchical segmentation allows for targeted compensation operations at different levels (first compensation operation on light panels, second compensation operation on display pixels) to address ink color consistency issues while maintaining the protective benefits of COB packaging.
2Device complexity
If only current brightness and chromaticity compensation methods are employed, then compensation is simplified, but color blocks persist and compensation effectiveness deteriorates
Solution Approach 1:
The compensation method is segmented into two distinct operations: a first compensation operation performed on light panels based on light panel data, and a second compensation operation performed on display pixels based on pixel data. This multi-level segmentation enables more effective color uniformity compensation by addressing variations at both the panel level and pixel level, eliminating color blocks that persist with single-level compensation methods.
3Manufacturing precision
If multiple compensation operations are performed, then brightness and chromaticity uniformity are improved, but processing time and complexity increase
Solution Approach 1:
The first compensation operation is performed on light panels before the second compensation operation on display pixels. This preliminary action at the panel level pre-corrects major variations, making the subsequent pixel-level compensation more efficient and potentially reducing the total processing time compared to performing only fine-grained pixel-level compensation.
Data Source
AI summary
A display apparatus includes a display screen and a driver circuit. The display screen includes a plurality of light boxes. Each of the light boxes includes a plurality of light panels. Each of the light panels includes a plurality of display pixels. The driver circuit is coupled to the display screen. The driver circuit is configured to drives the display screen to display an image. The driver circuit performs a first compensation operation on the display screen according to a first compensation data, and the first compensation data is calculated on the basis of the light panels. The driver circuit performs a second compensation operation on the display screen according to a second compensation data, and the second compensation data is calculated on the basis of the display pixels.