Display Device Segmented Grayscale Voltage Control
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Solution Overview
Problem
Display devices with single grayscale voltage generators often unintentionally emit high luminance light in non-fingerprint sensing areas when pixels in the fingerprint sensing area emit high luminance, disrupting normal display functionality.
Innovation Solution
A display device with separate grayscale voltage generators for fingerprint sensing and non-sensing areas, utilizing a data driver with digital-to-analog converters and multiplexers to apply specific voltages to data lines, ensuring that pixels in the non-sensing area maintain normal display while those in the sensing area emit high luminance for fingerprint detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single grayscale voltage generator is used, then device complexity is reduced, but pixels in non-fingerprint sensing areas unintentionally emit high luminance when fingerprint sensing pixels require high luminance
Solution Approach 1:
The patent divides the grayscale voltage generation into two separate generators: a first grayscale voltage generator for non-fingerprint sensing areas and a second grayscale voltage generator for fingerprint sensing areas. This segmentation allows independent control of luminance in different display regions, preventing unintended light emission in non-sensing areas while enabling high luminance output in sensing areas for fingerprint detection
Solution Approach 2:
The patent applies different grayscale voltage characteristics to different spatial regions: the first grayscale voltage generator provides appropriate voltages for normal display in non-sensing areas, while the second grayscale voltage generator provides high luminance voltages specifically for fingerprint sensing pixels. This local differentiation ensures that each region receives the appropriate voltage characteristics for its specific function
2Measurement precision
If pixels in fingerprint sensing area emit high luminance, then fingerprint detection capability is improved, but display quality in non-sensing area is degraded
Solution Approach 1:
The display area is segmented into fingerprint sensing areas and non-sensing areas, with each area controlled by dedicated grayscale voltage generators. This allows the sensing area to emit high luminance for improved fingerprint detection while the non-sensing area maintains normal display quality through separate voltage control
Solution Approach 2:
Different luminance characteristics are applied locally to different regions: high luminance is applied only to fingerprint sensing pixels where detection capability is prioritized, while normal luminance is maintained in non-sensing areas where display quality is prioritized. The separate grayscale voltage generators enable this localized quality differentiation
Data Source
AI summary
A display device includes: a first pixel coupled to a first data line; a second pixel coupled to a second data line; a first node to receive a first node voltage; a first grayscale voltage generator for generating first grayscale voltages; a second grayscale voltage generator for generating second grayscale voltages; and a data driver configured to apply, to the first data line, a first data signal generated based on one of the first grayscale voltages, and to apply, to the second data line, a second data signal generated based on one of the first node voltage, the first grayscale voltages, and the second grayscale voltages.