Display Device Low-Pass Filter Common Voltage Control
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Solution Overview
Problem
Conventional liquid crystal display devices face issues with image sticking and flicker due to residual charge accumulation, which is difficult to address through manual adjustment of common voltage, requiring additional hardware and increasing costs.
Innovation Solution
A display device incorporating a low-pass filter that filters out the AC part of display data to obtain a DC level, which is used to set the common voltage at an intermediate value, automatically adjusting and maintaining it to prevent image flicker without additional hardware components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manual adjustment of common voltage is performed in the production process, then the offset of common voltage can be adjusted, but manpower is consuming and image quality may vary with the detectors
Solution Approach 1:
The system uses the display data itself to automatically generate the common voltage through a low-pass filter, eliminating the need for manual adjustment. The common voltage is self-regulated based on the actual display signal characteristics, making the system self-sufficient and automated.
Solution Approach 2:
The common voltage is dynamically adjusted based on feedback from the display data. The low-pass filter processes the display data to generate a common voltage that automatically compensates for offsets, creating a closed-loop control system that adapts to actual operating conditions.
2Extent of automation
If digital system is used for adjustment of the offset of common voltage, then the offset can be adjusted automatically, but extra hardware components are needed and cost increases
Solution Approach 1:
The low-pass filter circuit serves multiple functions: it filters the display data to remove high-frequency components and simultaneously generates the common voltage signal. This multi-functionality eliminates the need for separate dedicated hardware components for common voltage generation.
Solution Approach 2:
The low-pass filter acts as an intermediary that transforms the display data into a suitable common voltage signal. By using the display data itself as the input to the filter, the system avoids needing additional sensors or conversion hardware, simplifying the overall device architecture.
3Reliability
If the voltage level of common voltage is configured at the intermediate value between positive polarity and negative polarity, then image flicker can be prevented, but the feed-through effect causes the voltage level to deviate from the intermediate value
Solution Approach 1:
The patent replaces the conventional mechanical/manual adjustment method with an electronic signal processing approach. The low-pass filter electronically extracts the DC component from the display data to generate the common voltage, providing more precise and stable voltage levels不受 manual intervention limitations.
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 prevents image flicker by maintaining the common voltage at an intermediate value, reducing manpower costs and eliminating the need for extra hardware, thereby enhancing image quality and reducing variability in liquid crystal display devices.
Implementation Method 1
A display device incorporating a low-pass filter that filters out the AC part of display data to obtain a DC level
Data Source
AI summary
A display device includes a data driver, a gate driver, a plurality of first pixel unit and a first low-pass filter. Each first pixel unit includes a first transistor, a first storage capacitor and a first liquid crystal capacitor. The first transistor is electrically coupled to the data driver and the gate driver and from which to receive the first display data and the gate control signal, respectively. The first transistor is configured to output the first display data according to the gate control signal. The first low-pass filter is configured to have its input electrode terminal electrically coupled to the second electrode terminal of one of the plurality of first transistor and its output electrode terminal electrically coupled to the second electrode terminal of the first liquid crystal capacitor of each of the first pixel units. An operation method for the display device is also provided.