Sensing Gate Driver Voltage Uniformity in Optical Display
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Solution Overview
Problem
Display devices with optical sensors face deviations in sensing gate off voltage, leading to non-uniform image sensing and touch recognition, due to variations in resistance values and applied voltages across different sensing gate drivers.
Innovation Solution
The implementation of a sensing gate driver configuration where the first and second sensing gate drivers receive substantially the same sensing gate off voltage, with specific resistance values and contact resistances designed to satisfy Equation 4, ensuring uniform voltage application across all drivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple sensing gate drivers are used in a display device with optical sensors, then the device can perform both image sensing and touch sensing functions, but deviations in sensing gate off voltage occur across different drivers due to variations in resistance values, leading to non-uniform sensing performance
Solution Approach 1:
The patent applies equipotentiality by designing the resistance network such that all sensing gate drivers receive substantially the same sensing gate off voltage. Specifically, the sum of resistance values from the voltage supply unit to each sensing gate driver is made equal, ensuring uniform voltage application across all drivers regardless of their position in the circuit.
Solution Approach 2:
The patent changes the resistance parameters by introducing specific resistance values (Ra, Rb, Rc, Rd) and contact resistances (Rcnt) that are carefully designed to satisfy Equation 4. By adjusting these resistance parameters, the patent compensates for voltage deviations and achieves uniform sensing gate off voltage across all drivers.
2Device complexity
If resistance values and contact resistances are not carefully designed, then the device structure remains simple, but deviations in sensing gate off voltage lead to non-uniform image sensing and touch recognition
Solution Approach 1:
The patent introduces specific resistance parameters (Ra, Rb, Rc, Rd) and contact resistances (Rcnt) that are carefully designed to satisfy Equation 4. By adjusting these resistance parameters, the patent compensates for voltage deviations and achieves uniform sensing gate off voltage across all drivers.
Solution Approach 2:
The patent implements a feedback mechanism where the resistance network is designed to automatically compensate for voltage drops. The resistance values are selected such that the voltage division across different paths results in equal sensing gate off voltages, providing inherent feedback compensation without requiring active control.
3Manufacturing precision
If sensing gate off voltage is applied uniformly to all sensing gate drivers, then image sensing and touch recognition performance become consistent, but this requires precise control of resistance values and applied voltages
Solution Approach 1:
The patent applies equipotentiality by designing the resistance network such that all sensing gate drivers receive substantially the same sensing gate off voltage. Specifically, the sum of resistance values from the voltage supply unit to each sensing gate driver is made equal, ensuring uniform voltage application across all drivers regardless of their position in the circuit.
Solution Approach 2:
The resistance network is designed to automatically compensate for voltage drops through passive voltage division. The specific resistance values (Ra, Rb, Rc, Rd) and contact resistances (Rcnt) are selected such that the network self-regulates to provide uniform voltage across all sensing gate drivers without requiring active control or feedback circuits.
Data Source
AI summary
A display device includes: a first display panel; a second display panel facing the first display panel and including an optical sensor; an electro-optical active layer positioned between the first display panel and the second display panel; and a sensing gate driver including a first sensing gate driver and a second sensing gate driver, the sensing gate driver configured to transmit a sensing gate signal to the optical sensor, in which a first sensing gate off voltage applied to the first sensing gate driver is substantially the same as a second sensing gate off voltage applied to the second sensing gate driver.