Common Sensing Amplifier Circuit for Accurate Pixel Signal Detection
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Solution Overview
Problem
Existing display apparatuses face challenges in accurately sensing the electrical characteristics of switching elements in pixels due to deviations in feedback capacitances and voltage differences between sensing amplifier input terminals, leading to reduced sensing accuracy and display quality.
Innovation Solution
A sensing circuit utilizing common sensing amplifiers connected to an analog-to-digital converter for multiple sensing lines, which sets paths for sensing signals and reference voltages, and includes switch matrices and mode setting circuits to enhance sensing accuracy by compensating for feedback capacitance deviations and voltage offsets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate sensing amplifiers are used for each sensing line, then sensing accuracy is maintained, but device complexity and circuit structure become excessive
Solution Approach 1:
Multiple sensing amplifiers are merged into a single common sensing amplifier that serves multiple sensing lines. The amplifier sequentially processes signals from different sensing lines through switch matrix control, reducing the total number of amplifiers while maintaining sensing accuracy through shared resource allocation.
Solution Approach 2:
The common sensing amplifier is designed to perform multiple functions by sequentially serving different sensing lines. Through the switch matrix and mode setting circuits, a single amplifier handles sensing tasks for multiple lines, making the amplifier a universal component that replaces multiple dedicated amplifiers.
2Ease of manufacture
If feedback capacitance values vary between sensing amplifiers, then device manufacturing becomes easier, but sensing accuracy decreases due to capacitance deviation
Solution Approach 1:
By using a single common sensing amplifier for multiple sensing lines, the problem of capacitance deviation between multiple amplifiers is eliminated. The unified amplifier structure ensures consistent feedback capacitance values, improving sensing accuracy while simplifying manufacturing requirements.
3Ease of operation
If voltage offsets exist between sensing amplifier input terminals, then device operation becomes simpler, but sensing accuracy is reduced
Solution Approach 1:
The common sensing amplifier structure ensures that both input terminals are part of the same amplifier device, guaranteeing identical voltage offsets. This unified structure eliminates voltage offset differences between separate amplifiers while maintaining operational simplicity.
4Measurement precision
If multiple sensing reference voltage generating circuits are used, then sensing accuracy is maintained, but device complexity increases
Solution Approach 1:
Multiple sensing reference voltage generating circuits are merged into a single shared circuit that provides reference voltages to the common sensing amplifier. This unified reference voltage supply reduces the number of generating circuits while maintaining sensing accuracy through centralized voltage management.
Solution Approach 2:
The single sensing reference voltage generating circuit is designed to serve multiple sensing lines through the common sensing amplifier. It performs the universal function of providing reference voltages for all sensing operations, replacing multiple dedicated reference voltage circuits.
Data Source
AI summary
A sensing circuit includes a first input selecting circuit connected to a first sensing line and a second sensing line, a first path setting circuit that sets a path of a first sensing signal received from the first sensing line or a path of a second sensing signal received from the second sensing line, a second path setting circuit that sets a path of a sensing reference voltage, a first switch matrix connected to the first path setting circuit and the second path setting circuit, a first mode setting circuit connected to a first output terminal of the first switch matrix, a first common sensing amplifier connected to the first mode setting circuit, a second mode setting circuit connected to a second output terminal of the first switch matrix, and a second common sensing amplifier connected to the second mode setting circuit.