VCOM Voltage Compensation Circuit for Display Panels
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Solution Overview
Problem
Existing VCOM voltage compensation technologies fail to effectively stabilize the common electrode voltage in liquid crystal displays, particularly in areas with small voltage differences, and are complex and costly due to their reliance on active voltage inputs and power integrated circuits, leading to residual image issues and poor compensation effects.
Innovation Solution
A compensation device comprising a compensation circuit, comparison circuit, and adjustment circuit is used to generate and adjust the common electrode compensation signal based on feedback signals, with capacitors and resistors configured to filter and stabilize the VCOM voltage, allowing for adjustable compensation rates across different areas of the display panel, improving voltage stability and reducing line losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If active voltage inputs and power integrated circuits are used for VCOM compensation, then compensation effectiveness is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the VCOM compensation function from the complex power integrated circuit and implements it using simple passive components (capacitors and resistors) arranged in specific configurations. This separation allows the compensation function to be achieved without requiring complex active voltage inputs and power ICs, thereby reducing device complexity while maintaining compensation effectiveness.
Solution Approach 2:
The patent replaces expensive and complex active components with simple, inexpensive passive components (capacitors and resistors) that can be easily manufactured and integrated into the display panel. These passive components provide the necessary compensation functionality without requiring complex control circuits or power management, significantly reducing cost and complexity.
2Ease of manufacture
If uniform compensation is applied across the entire display panel, then implementation simplicity is improved, but compensation precision for different areas deteriorates
Solution Approach 1:
The patent divides the display panel into multiple regions (first region and second region) and applies different compensation strategies to each region. The first region uses a first compensation amount while the second region uses a second compensation amount, allowing each area to receive optimized compensation tailored to its specific voltage characteristics. This local differentiation improves compensation precision without significantly complicating the overall implementation.
Solution Approach 2:
The patent segments the display panel into distinct regions with different compensation requirements and implements region-specific compensation circuits. This segmentation allows the system to handle different voltage conditions in different areas independently, improving overall compensation accuracy while maintaining manageable implementation complexity through modular design.
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 enhances the stability and adjustability of the common electrode voltage, improving the display panel's ability to compensate for voltage shifts and reduce residual images by dynamically adjusting capacitance and amplifier gain according to the phase difference between input and feedback signals, thereby improving the overall display quality.
Implementation Method 1
a capacitor configured to filter the common electrode voltage
Implementation Method 2
an amplifier configured to amplify the compensation signal
Data Source
AI summary
A compensation device, a display device and a method for compensating common electrode voltage are provided in the embodiments of the present disclosure. A compensation device for a display panel according to an embodiment includes a compensation circuit, a comparison circuit, and an adjustment circuit. The compensation circuit generates a common electrode compensation signal to be provided to the display panel based on a common electrode input signal for providing a common electrode voltage to the display panel and a common electrode feedback signal from the display panel. The comparison circuit compares the common electrode compensation signal with the common electrode feedback signal. The adjustment circuit adjusts the common electrode compensation signal according to the comparison result of the comparison circuit.