LCD Common Voltage Driver Segmentation for Black Matrix Reduction
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Solution Overview
Problem
Liquid Crystal Displays (LCDs) face challenges in minimizing circuit configurations and reducing the size of the black matrix due to the placement of gate and common voltage drivers, which affects the display's efficiency and image quality.
Innovation Solution
The proposed solution involves a display device with a plurality of pixels connected to gate lines and common voltage lines, where gate drivers and common voltage drivers are optimized to perform inversion driving per frame, minimizing circuit configurations and reducing the black matrix area by overlapping voltage line driving intervals and using simple circuit configurations for the common voltage drivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If gate drivers and common voltage drivers are placed on the display substrate, then the display device can be driven, but the circuit area increases and the black matrix size increases
Solution Approach 1:
The display device is divided into multiple banks, with each bank having its own gate driver and common voltage driver. This segmentation allows drivers to be distributed across the display substrate, reducing the concentration of circuit area in any single region and minimizing the black matrix size required for driver placement.
2Reliability
If inversion driving is performed per frame on common voltage lines, then image quality is improved by preventing deterioration, but the circuit configuration becomes more complex
Solution Approach 1:
Inversion driving of the common voltage lines is performed in advance before the gate lines are driven. By pre-inverting the common voltage lines, the patent simplifies the overall circuit configuration while still achieving the image quality improvement needed to prevent deterioration from one-directional electric fields.
3Reliability
If multiple common voltage drivers are used for different groups of pixels, then inversion driving can be performed on all common voltage lines, but the device complexity increases
Solution Approach 1:
Each common voltage driver is designed to handle multiple common voltage lines within its bank. This multi-functionality allows a single driver to perform inversion driving on several lines, reducing the total number of drivers needed while maintaining the inversion driving capability across all common voltage lines in the display device.
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
This approach minimizes the circuit area and reduces the black matrix size, enhancing the display's efficiency and image quality by optimizing the driving method for LCDs.
Implementation Method 1
generate an electric field for driving of the liquid crystal layer by applying different voltages to the common electrode and the pixel electrode, and control the light transmittance of the liquid crystal layer by controlling the intensity of the electric field
Data Source
AI summary
A display device may have a plurality of pixels of a first group connected to a plurality of first gate lines and first common voltage lines and a plurality of pixels of a second group connected to a plurality of second gate lines and second common voltage lines. The display device drives the first common voltage lines and the second common voltage lines in synchronization with a first clock signal; and drives the plurality of first gate lines and the plurality of second gate lines in synchronization with a second clock signal. I-th first and second common voltage lines (i is a positive integer) are driven to one of a first common voltage and a common reference voltage, and (i+1)-th first and second common voltage lines are driven to one of a second common voltage and the common reference voltage.