LCD Pixel Circuit Reducing Color Shift via Single Gate Line
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Solution Overview
Problem
Current LCD panels suffer from color shift and de-saturation issues at wide view angles due to varying brightness and color mixing, and existing solutions complicate timing control and reduce aperture ratio by requiring multiple gate line connections.
Innovation Solution
A pixel unit circuit with a first and second liquid crystal capacitor, and transistors connected between data and gate lines, including a third transistor between common voltage and the second transistor, which provides a Low Color Shift Resistor (LCSR) to maintain a fixed voltage ratio and reduce color shift, and optional circuit subunits in parallel with the third transistor to further stabilize voltage ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If each pixel is electronically connected to at least two gate lines to solve color shift, then color shift problem is addressed, but aperture ratio is occupied and timing control becomes complicated
Solution Approach 1:
The patent merges the functions of multiple gate line connections into a single gate line by using a pixel circuit that can generate multiple gate driving signals internally. The first and second gate driving signals are generated from one gate line signal through signal division and phase control circuits, eliminating the need for separate gate line connections while maintaining color shift correction capability.
Solution Approach 2:
The pixel circuit is designed to perform multiple functions using a single gate line connection: it generates both first and second gate driving signals with different phases, controls both first and second liquid crystal capacitors, and maintains color shift correction. This multi-functional design reduces the number of required gate line connections while preserving all necessary control capabilities.
2Reliability
If multiple gate driving signal channels are used to control pixel circuits, then color shift is corrected, but timing control becomes complicated
Solution Approach 1:
The patent introduces signal division and phase control circuits as intermediary components within the pixel circuit. These intermediaries take a single gate line signal and transform it into multiple phase-differentiated gate driving signals, simplifying the external timing control while maintaining the complex phase relationships needed for color shift correction.
Solution Approach 2:
The pixel circuit performs self-service by generating its own multiple gate driving signals internally from a single gate line connection. The circuit automatically creates the necessary phase differences and signal divisions without requiring complex external timing control, making the system easier to operate while maintaining color shift correction functionality.
3Reliability
If pixel circuits are connected to multiple gate lines, then color shift problem is solved, but aperture ratio is reduced
Solution Approach 1:
The patent merges multiple gate line connections into a single connection, freeing up the space that would have been occupied by additional gate lines. This allows the pixel circuit to maintain color shift correction functionality while increasing the aperture ratio by reducing the area occupied by gate line infrastructure.
Data Source
AI summary
A liquid crystal display panel includes multiple pixel units each connected to a data line and a gate line. The pixel unit defines a first region and a second region. A first liquid crystal capacitor is disposed in the first region. A first transistor is disposed in the first region and is connected between the data line and the first liquid crystal capacitor, and has a control electrode connected to the gate line. A second liquid crystal capacitor is disposed in the second region. A second transistor is disposed in the second region and is connected between the data line and the second liquid crystal capacitor, and has a control electrode connected to the gate line. A third transistor is disposed in the second region and is connected between a common voltage and the second transistor and has a control electrode connected to the gate line.