Display Sensing Circuit With Shared Amplifier for Accurate Pixel Sensing
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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 with a common sensing amplifier disposed in front of an analog-to-digital converter for multiple sensing lines, which sets paths for sensing signals and reference voltages using switch matrices and mode setting circuits, thereby preventing or reducing the decrease in sensing accuracy caused by feedback capacitance deviations and voltage differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate sensing amplifiers are used for each sensing line, then sensing accuracy can be maintained, but device complexity and the number of components increase
Solution Approach 1:
The patent combines multiple sensing amplifiers into a single shared sensing amplifier that sequentially serves multiple sensing lines. The amplifier is time-shared across different sensing lines through controlled switching, reducing the total number of amplifiers needed while maintaining sensing accuracy for each line.
Solution Approach 2:
The patent introduces dynamic switching mechanisms that allow the sensing amplifier to dynamically change its connection from one sensing line to another. This dynamic reconfiguration enables a single amplifier to serve multiple sensing lines at different time intervals, reducing static circuit complexity.
2Measurement precision
If multiple sensing reference voltage generating circuits are used, then voltage differences between amplifier input terminals can be compensated, but device complexity increases
Solution Approach 1:
The patent implements a single sensing reference voltage generating circuit that serves multiple sensing amplifiers and sensing lines. This universal reference voltage source provides consistent reference levels across all sensing operations, eliminating the need for separate reference voltage circuits for each amplifier while maintaining accuracy.
Solution Approach 2:
The patent uses a common sensing reference voltage to establish equipotential reference levels across all sensing amplifier input terminals. By providing a unified reference voltage, the system compensates for voltage differences and offsets without requiring multiple separate reference voltage generating circuits.
3Device complexity
If a common sensing amplifier is shared among multiple sensing lines, then device complexity is reduced, but sensing accuracy may decrease due to feedback capacitance deviations
Solution Approach 1:
The patent incorporates feedback mechanisms that monitor and compensate for feedback capacitance deviations in the shared sensing amplifier. By detecting variations in capacitance values and applying corrective feedback signals, the system maintains sensing accuracy despite the amplifier being shared across multiple sensing lines.
Solution Approach 2:
The patent dynamically adjusts operating parameters of the sensing amplifier, such as feedback capacitance values and gain settings, based on the specific sensing line being measured. This parameter adaptation allows the amplifier to optimize its performance for each sensing line, compensating for deviations and maintaining accuracy.
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.