Display Device Gate Driver for Fingerprint Sensor Sensitivity
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Solution Overview
Problem
Display devices with integrated fingerprint sensors face challenges in maintaining the duration of exposure to light, especially when performing hysteresis compensation, which affects the sensitivity of the fingerprint sensors.
Innovation Solution
A display device design where fingerprint sensors and pixels are disposed in the same layer, with a gate driver providing independent reset and scan signals to the fingerprint sensors, allowing for extended exposure to light even during hysteresis compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If fingerprint sensors are integrated in the same layer as pixels, then the display area is widened and sensor exposure to light is improved, but the duration of exposure to light decreases when hysteresis compensation is performed
Solution Approach 1:
The gate driver is divided into separate modules: a first gate signal supply module for providing gate signals to pixels, and a second gate signal supply module for providing sensing signals to fingerprint sensors. This segmentation allows independent control of signal timing for different components, enabling the fingerprint sensors to receive sensing signals during periods when pixels are undergoing hysteresis compensation, thus maintaining exposure duration while integrating sensors in the same layer.
2Reliability
If hysteresis compensation is performed during horizontal scanning periods, then pixel performance is improved, but fingerprint sensor sensitivity deteriorates due to reduced light exposure
Solution Approach 1:
The gate driver provides sensing signals to fingerprint sensors in advance during periods when pixels do not require gate signals, before the hysteresis compensation period begins. This preliminary action ensures that fingerprint sensors complete their light exposure and sensing operations before pixels enter the hysteresis compensation phase, maintaining both pixel performance and sensor sensitivity.
Solution Approach 2:
The gate driver operates in periodic cycles, alternating between providing gate signals to pixels and providing sensing signals to fingerprint sensors. During each horizontal scanning period, the gate driver selectively activates the appropriate module based on the operational phase, ensuring that hysteresis compensation for pixels and light exposure for fingerprint sensors do not occur simultaneously, thus resolving the conflict between pixel performance and sensor sensitivity.
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 design enhances the sensitivity of fingerprint sensors by increasing the duration of exposure to light, while also enabling effective hysteresis compensation in the display device.
Implementation Method 1
each of the fingerprint sensors may comprise: a light-receiving element
Data Source
AI summary
A display device includes a display panel having a plurality of pixels connected to gate lines and data lines, and a plurality of fingerprint sensors connected to sensing lines and read-out lines. A gate driver provides gate signals to the gate lines and provides sensing signals to the sensing lines. The gate driver includes a first gate signal supply module providing a first gate signal to a first gate line among the gate lines. A first switching element is turned on by a reset enable signal to connect the first gate line and a first sensing line among the sensing lines.