Sensor Reset Voltage Control for Display Devices
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Solution Overview
Problem
The performance of sensors in display devices is reduced due to variations in reset voltage levels, which are affected by the location of reset lines and changes in driving voltage levels.
Innovation Solution
A display device design that includes a sensor with a light sensing element, transistors, and a driving controller that adjusts the voltage level of the reset voltage based on the driving voltage level, ensuring consistent sensor performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the reset voltage level is fixed, then the circuit design is simple, but the sensor performance varies due to location and driving voltage changes
Solution Approach 1:
The reset voltage is changed from a fixed static value to a dynamic value that varies based on the driving voltage level. The driving controller dynamically adjusts the reset voltage level according to the current driving voltage, enabling the system to adapt to changing conditions and maintain consistent sensor performance across different locations and operating states.
Solution Approach 2:
The invention changes the parameter of reset voltage from a constant value to a variable value that depends on the driving voltage. By modifying the reset voltage parameter dynamically based on driving voltage levels, the system compensates for performance variations caused by location and driving voltage changes, resolving the contradiction between simple design and consistent performance.
2Reliability
If the reset voltage level is adjusted based on driving voltage level, then the sensor performance is maintained, but the control system becomes more complex
Solution Approach 1:
The driving controller is designed to perform multiple functions: it controls the driving voltage, determines the appropriate reset voltage level based on the driving voltage, and outputs control signals to the voltage generator. By making the controller multi-functional, the invention avoids adding separate dedicated hardware for reset voltage control, thus maintaining sensor performance consistency while minimizing the increase in overall system complexity.
Solution Approach 2:
The system implements a feedback mechanism where the driving controller determines the reset voltage level based on the driving voltage level. This closed-loop control allows the system to automatically adjust the reset voltage to maintain optimal sensor performance, resolving the contradiction by using intelligent control rather than simple fixed values, while the feedback is integrated into the existing controller to limit complexity growth.
3Ease of manufacture
If a fixed reset voltage is used, then the manufacturing is simple, but the sensor performance varies across different locations
Solution Approach 1:
The invention applies local quality by making the reset voltage location-specific and condition-specific. Instead of using a single fixed reset voltage for all sensors regardless of location, the system determines different reset voltage levels based on the driving voltage, which accounts for location-specific variations. This allows each sensor to receive an optimized reset voltage tailored to its operating conditions, improving measurement precision while maintaining manufacturing simplicity through a unified control approach.
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
The solution maintains the performance of sensors despite changes in driving voltage levels, thereby enhancing the reliability and efficiency of touch-based input schemes in display devices.
Implementation Method 1
a sensor includes a light sensing element, a first transistor, a second transistor, and a third transistor. The light sensing element is connected between a sensing node and a driving voltage line.
Data Source
AI summary
A sensor includes a light sensing element connected between a sensing node and a driving voltage line, a first transistor connected between a reset voltage line and the sensing node, a second transistor connected between a sensor driving voltage line and an intermediate node and including a gate electrode connected to the sensing node, and a third transistor connected between the intermediate node and a readout line and including a gate electrode connected to a scan line. A voltage level of a reset voltage provided to the reset voltage line is changed depending on a voltage level of a driving voltage provided to the driving voltage line.