Pixel Electrode Voltage Stabilization Circuit for LCD
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Solution Overview
Problem
Liquid crystal flat displays, particularly TFT-LCDs, face issues with voltage fluctuations in the common electrode affecting the charging of the liquid crystal layer, leading to abnormal display phenomena such as crosstalk, greenish abnormalities, and residual images due to the inability to maintain stable voltage for the liquid crystal capacitor.
Innovation Solution
A circuit for processing a pixel electrode voltage is introduced, which superimposes the voltage of the common electrode on the original pixel electrode voltage using an operational amplifier and resistors to stabilize the output voltage, ensuring it remains consistent with the common electrode voltage, thereby eliminating the impact of voltage fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the common electrode voltage is kept simple and direct, then the circuit structure is simple, but the voltage fluctuation of the common electrode directly affects the charging of the liquid crystal layer causing display abnormalities
Solution Approach 1:
The patent introduces a voltage processing circuit as an intermediary between the common electrode voltage source and the pixel electrode. This circuit includes operational amplifiers and resistors that process the common electrode voltage before applying it to the pixel electrode, thereby mediating the voltage transmission to eliminate direct fluctuations while maintaining circuit functionality.
Solution Approach 2:
The voltage processing circuit implements feedback mechanisms where the output voltage is monitored and adjusted based on the common electrode voltage fluctuations. The operational amplifiers compare the input common electrode voltage with a reference and adjust the output to maintain stability, creating a closed-loop feedback system that eliminates voltage variations.
2Reliability
If a voltage processing circuit is introduced to stabilize the pixel electrode voltage, then the display stability is improved, but the circuit structure becomes more complex
Solution Approach 1:
The patent changes the electrical parameters within the voltage processing circuit, specifically using operational amplifiers with high gain and precise resistor values to achieve voltage stabilization. By adjusting these parameters, the circuit can compensate for common electrode voltage fluctuations and maintain stable pixel electrode voltage without requiring overly complex circuit topologies.
3Ease of operation
If the common electrode voltage fluctuates, then the circuit operation is simple, but the liquid crystal layer charging becomes unstable causing crosstalk and residual images
Solution Approach 1:
The voltage processing circuit performs preliminary anti-action by pre-compensating for common electrode voltage fluctuations before they affect the pixel electrode. The circuit anticipates and counteracts potential voltage variations through its feedback mechanism, preventing the harmful effects from occurring in the first place rather than correcting them after they manifest.
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 effectively stabilizes the pixel electrode voltage, preventing abnormal display issues and maintaining normal gray scale output, enhancing picture quality and user experience.
Implementation Method 1
an operational amplifier having a negative phase input terminal connected to the ground through a first resistor and connected to an output terminal thereof through a second resistor; a third resistor having a first end connected to the first input terminal and a second end connected to a positive phase input terminal of the operational amplifier; and a fourth resistor having a first end connected to the second input terminal and a second end connected to the positive phase input terminal of the operational amplifier
Implementation Method 2
a filter capacitor connected between the second input terminal and the first end of the fourth resistor
Data Source
AI summary
The present disclosure provides a circuit for processing a voltage of a pixel electrode and a display apparatus. The circuit for processing a voltage of a pixel electrode comprises: a first input terminal configured to input an original voltage of the pixel electrode; a second input terminal configured to input a voltage of a common electrode; and an output terminal configured to output a processed voltage of the pixel electrode, wherein the circuit for processing a voltage of a pixel electrode is configured to superimpose the voltage of the common electrode on the original voltage of the pixel electrode, to acquire a voltage which is stable with respect to the voltage of the common electrode as the processed voltage of the pixel electrode.