Display Panel Light Sensor Driving for Faster Fingerprint Sensing
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Solution Overview
Problem
Existing display devices face challenges in efficiently reducing the sensing time of light sensors, particularly in performing user authentication functions such as fingerprint sensing, due to limitations in the driving methods of display panels.
Innovation Solution
The display device incorporates a display panel with a light sensor that generates a sensing signal in response to a gate signal, where the display panel driver provides the gate signal to a sensing area in a dedicated sensing frame, allowing for a plurality of sub-frames with extended pulse lengths and selective scanning of pixel lines, thereby optimizing the sensing operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the gate signal is provided to the entire display area in every frame, then the display operation is maintained, but the sensing time of the light sensor is increased
Solution Approach 1:
The display area is segmented into a display area and a sensing area, and the frame is divided into a display frame and a sensing frame. The gate signal is selectively provided to different areas in different frames, allowing parallel processing of display and sensing operations without interference, thereby reducing sensing time while maintaining display functionality
Solution Approach 2:
The driving method dynamically switches between different frame types (display frame and sensing frame) and selectively controls the gate signal provision to different pixel lines based on the current operation mode, enabling flexible optimization of sensing speed without compromising display performance
2Productivity
If the gate signal pulse length is extended to cover more pixel lines, then more pixel lines can be scanned in parallel, but the frame time consumption increases
Solution Approach 1:
The pixel lines are divided into different groups (first group and second group) that are scanned in different sub-frames. This segmentation allows the gate signal to be efficiently utilized across multiple pixel lines without extending the overall frame time, as each group is processed in a dedicated time slot within the sensing frame
Solution Approach 2:
The sensing operation continues across multiple sub-frames and pixel line groups without interruption. The gate signal is continuously provided to different pixel line groups in sequence, ensuring that the sensing operation maintains high productivity throughout the sensing frame duration without idle periods
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 approach significantly reduces the sensing time by allowing for parallel processing of sensing operations across multiple pixel lines within a single frame, enhancing the efficiency and speed of user authentication processes.
Implementation Method 1
a light sensor generating a sensing signal corresponding to an amount of received light
Data Source
AI summary
A display device includes: a display panel including a sub-pixel and a light sensor configured to generate a sensing signal corresponding to an amount of received light and to provide the sensing signal to a display panel driver in response to a gate signal; and the display panel driver configured to drive the display panel, wherein the display panel driver is configured to: provide the gate signal to a display area of the display panel in a normal frame; and provide the gate signal to a sensing area in the display area, and to receive the sensing signal in a sensing frame.