Pixel Electrode Voltage Detection Circuit for Flat Panel Displays
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Solution Overview
Problem
Existing technologies face challenges in accurately detecting pixel electrode voltage in flat panel display devices, leading to complex compensation methods and potential image distortions due to voltage deviations, especially when external induction circuits affect small capacitance values.
Innovation Solution
A detecting circuit for pixel electrode voltage is introduced, comprising a signal amplifying unit and a signal detecting unit connected to the pixel electrode, utilizing MOS transistors to amplify and detect voltage signals, allowing for precise observation and compensation of voltage variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If external induction circuits are used to detect pixel electrode voltage, then voltage detection capability is provided, but measurement precision deteriorates due to interference with small capacitance values
Solution Approach 1:
The patent introduces an intermediary detection circuit that includes a buffer amplifier and a voltage divider network. This intermediary circuitry isolates the pixel electrode from direct external induction circuits, preventing capacitance interference while still enabling voltage detection. The buffer amplifier acts as a mediator to transfer the voltage signal without allowing external circuits to directly couple with the small capacitance of the pixel electrode.
Solution Approach 2:
The detection system is segmented into multiple functional stages: a first detection circuit close to the pixel electrode for initial voltage sampling, and a second detection circuit for processing and output. This segmentation allows the first circuit to be optimized for minimal capacitance interference while the second circuit handles the signal processing, thereby maintaining measurement precision throughout the detection chain.
2Reliability
If complex compensation methods are used to correct voltage deviations, then image quality is improved, but device complexity increases
Solution Approach 1:
The patent implements a feedback mechanism where the detected pixel electrode voltage is fed back to a control circuit that adjusts the common electrode voltage accordingly. This closed-loop feedback system automatically compensates for voltage deviations and kickback effects, improving image quality while keeping the compensation logic simple and automated rather than requiring complex manual calibration methods.
Solution Approach 2:
The compensation method relies on dynamically changing the common electrode voltage parameter based on the detected pixel electrode voltage variations. By adjusting the common voltage parameter in response to measured deviations, the system corrects image quality issues without requiring complex structural modifications or multiple compensation stages.
3Object-affected harmful factors
If voltage compensation is performed to correct kickback voltage effects, then image distortions are reduced, but measurement precision requirements increase
Solution Approach 1:
The patent applies preliminary action by detecting the pixel electrode voltage immediately after the gate driving pulse falls, before the kickback voltage fully develops and causes image distortion. The detection circuit captures the voltage state at this critical moment, allowing compensation to be applied in advance or in real-time, thereby reducing image distortions while maintaining manageable measurement precision requirements through timely detection.
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 provides a simple and accurate method for detecting pixel electrode voltage variations, facilitating effective voltage compensation and reducing image distortions, even in cases where external induction circuits might interfere with small capacitance values.
Implementation Method 1
a signal amplifying unit connected with the pixel electrode in the pixel unit, for amplifying a voltage signal of the pixel electrode
Implementation Method 2
a signal detecting unit connected with the signal amplifying unit, for detecting the amplified voltage signal of the pixel electrode by the signal amplifying unit
Data Source
AI summary
A detecting circuit for pixel electrode voltage of a flat panel display device, the flat panel display device having a plurality of scanning lines and a plurality of data lines crossing with the plurality of scanning lines, the plurality of scanning lines and data lines define a plurality of pixel units, and each of the pixel units including a pixel switching element and a pixel electrode. The detecting circuit for pixel electrode voltage includes at least one detecting sub-circuit for pixel electrode voltage. The detecting sub-circuit for pixel electrode voltage includes: a signal amplifying unit connected with the pixel electrode in the pixel unit, for amplifying a voltage signal of the pixel electrode; and a signal detecting unit connected with the signal amplifying unit, for detecting the voltage signal of the pixel electrode that has been amplified by the signal amplifying unit, and outputting a variation in the voltage signal of the pixel electrode with time. Compared with the prior art, the present invention has advantages of simple detecting circuit structure and accurate detection result.