Display Driver IC Synchronizes Mask Image Output With Brightness
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Solution Overview
Problem
In fingerprint recognition using electronic devices, the timing of outputting a mask image and the display's brightness can be mismatched, leading to user discomfort due to glare or darkness, affecting user convenience.
Innovation Solution
An electronic device with a display panel, fingerprint sensor, and display driver IC synchronizes the output of a mask image with the brightness adjustment, ensuring the mask image is displayed when the display emits light, thereby preventing glare and maintaining user comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the mask image is output later than the timing at which the display emits light, then the display can be bright for normal viewing, but the user may be blinded by the light emitted from the display
Solution Approach 1:
The mask image is output in advance before the display emits light for fingerprint recognition. This preliminary action ensures that when the display brightness increases, the mask image is already displayed, preventing the user from being blinded by sudden glare while maintaining normal display brightness for other areas.
2Object-affected harmful factors
If the mask image is output earlier than the timing at which the display emits light, then glare is prevented, but the screen may be dark due to the mask image, and thus the user may be uncomfortable
Solution Approach 1:
The mask image is displayed with different transparency levels in different areas. The area corresponding to the fingerprint sensor has high transparency to allow light emission for recognition, while other areas have low transparency to prevent glare. This local differentiation maintains user comfort by keeping the overall screen dark while enabling fingerprint detection.
3Measurement precision
If the display emits light brightly for fingerprint recognition, then the fingerprint sensor can obtain clear fingerprint information, but the user may experience glare and discomfort
Solution Approach 1:
The display screen is segmented into different functional areas with different transparency characteristics. The fingerprint sensor area is made transparent to allow bright light emission for accurate fingerprint capture, while surrounding areas remain dark through the mask image to prevent user glare. This segmentation enables simultaneous achievement of recognition accuracy and user comfort.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This synchronization improves user convenience by preventing glare and ensuring the display is dark except for the fingerprint detection area, enhancing the fingerprint recognition process.
Implementation Method 1
The electronic device may brighten the brightness of a display to obtain the fingerprint information. The light emitted from the display may be input to the fingerprint sensor after being reflected from a user's finger.
Implementation Method 2
The electronic device may output a mask image when obtaining the fingerprint information. The mask image may refer to an image having a somewhat dark color to prevent glare of the user when the display emits light brightly.
Data Source
AI summary
According to an embodiment disclosed herein, an electronic device may include a housing, a display panel including a plurality of pixels housed in the housing, a flexible printed circuit board electrically connected to the display panel, a fingerprint sensor disposed under at least a portion of the display panel and on the flexible printed circuit board, a display driver integrated circuit (IC) and a processor electrically connected to the fingerprint sensor and the display driver IC.