Display Device Sensing Circuit Capacitance Deviation Compensation
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Solution Overview
Problem
The dispersion of capacitance in sensing circuits of display devices increases due to capacitance deviations in sensing capacitors, leading to decreased sensing efficiency and visible vertical stripes on the display panel caused by noise voltages.
Innovation Solution
The introduction of an additional sensing line based on capacitance deviation, connected through a dual transistor, allows for the replacement of affected sensing lines to reduce capacitance deviation and improve sensing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sensing capacitors are used in sensing lines to store characteristic values, then the sensing function is enabled, but capacitance deviation increases causing dispersion and noise
Solution Approach 1:
The patent creates a copy of the sensing line structure by adding a second sensing line that mirrors the first sensing line's configuration. This duplicate sensing line serves as a reference to detect and compensate for capacitance deviations in the original sensing line, enabling the system to identify and correct measurement errors without changing the fundamental sensing capacitor structure
Solution Approach 2:
The patent implements a feedback mechanism where the sensing circuit detects capacitance deviations in real-time by comparing signals from multiple sensing lines. When a deviation is detected, the system adjusts the sensing operation to compensate for the error, creating a closed-loop control system that continuously monitors and corrects capacitance variations to maintain measurement precision
2Measurement precision
If additional sensing lines are added to replace affected lines, then capacitance deviation is reduced, but device complexity increases
Solution Approach 1:
The additional sensing line serves multiple functions: it acts as a reference for detecting capacitance deviations, provides a backup sensing path when deviations occur, and enables compensation calculations. This multi-functionality justifies the added complexity by providing several benefits from a single structural addition
Data Source
AI summary
A method of driving a display device includes: sensing characteristic information of pixels by outputting sensing voltages to sensing lines; and operating an external compensation of the pixels based on the characteristic information. The sensing of the characteristic information of pixels includes: detecting a capacitance deviation of sensing capacitors of first sensing lines connected to the sensing lines; and sensing the characteristic information of the pixels by replacing at least one of the first sensing lines with a second sensing line based on the capacitance deviation.