Display Driver Chip Control for Flicker-Free Fingerprint Recognition
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Solution Overview
Problem
Existing display methods for optical fingerprint recognition in electronic devices suffer from unsatisfactory display effects, such as color cast, grayscale transition, and screen flickering, particularly when modes like eye protection or bright mode are enabled or disabled during fingerprint recognition.
Innovation Solution
The display driver chip controls the brightness of the fingerprint recognition area and a mask area in the image independently, with the application processor sending indication information and parameters to ensure the fingerprint recognition area is brighter than the mask area, avoiding screen flickering and simplifying processing on the processor side.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the application processor draws and processes the image for fingerprint recognition, then the display effect can be controlled, but the processing complexity increases and recognition speed decreases
Solution Approach 1:
The patent extracts the image processing function from the application processor and transfers it to the display driver chip. The display driver chip independently controls the brightness of the fingerprint recognition area and mask area based on parameters received from the application processor, eliminating the need for the application processor to draw and process the complete image, thereby reducing processing complexity while maintaining display quality
Solution Approach 2:
The patent introduces an intermediary mechanism where the application processor sends only essential parameters (first indication information and first parameter) to the display driver chip, which then acts as an intermediary to generate and control the display image. This intermediary approach simplifies the application processor's workload while ensuring precise control over the fingerprint recognition area's brightness
2Adaptability or versatility
If the color module processes the image during fingerprint recognition, then display modes can be maintained, but color cast and grayscale transition occur
Solution Approach 1:
The patent applies local quality by making the fingerprint recognition area have different brightness characteristics from the mask area. The display driver chip controls the fingerprint recognition area's brightness independently using the first indication information, ensuring it is brighter than the mask area controlled by the first parameter. This local differentiation eliminates color cast and grayscale transition issues that would otherwise affect the entire display
Solution Approach 2:
The patent segments the display area into two distinct regions: the fingerprint recognition area and the mask area. Each region is controlled independently with different brightness parameters. The display driver chip processes these segmented regions separately, allowing the fingerprint recognition area to maintain optimal brightness for recognition while the mask area maintains display mode characteristics, thus avoiding color cast and grayscale transition
3Adaptability or versatility
If the display mode changes during fingerprint recognition, then user preferences can be updated, but screen flickering and hue changes occur
Solution Approach 1:
The patent applies preliminary action by having the display driver chip pre-control the brightness of the fingerprint recognition area based on the first indication information before any display mode changes occur. This preliminary brightness control ensures that the fingerprint recognition area maintains stable, bright display characteristics regardless of subsequent display mode changes, preventing screen flickering and hue changes that would otherwise disrupt the recognition process
Data Source
AI summary
Embodiments of this application provide a display method and an electronic device. The electronic device includes an application processor, a display driver chip, and a display panel. The display panel is configured to display a first image. The application processor is configured to send first indication information and a first parameter to the display driver chip. The display driver chip is configured to: control, based on the received first indication information, brightness of a fingerprint recognition area in the first image to be first brightness, and control brightness of a mask area in the first image to be second brightness. The brightness of the mask area is controlled based on the first parameter, and the mask area is an area in the first image except the fingerprint recognition area. The display panel is configured to display an updated first image.