Pixel Structure Voltage Divider for LCD Low Skew
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Solution Overview
Problem
Multi-domain vertical alignment type liquid crystal display panels experience color distortion at large viewing angles due to differing liquid crystal orientations, and existing solutions either increase driver costs or reduce aperture ratio to achieve low skew designs.
Innovation Solution
A pixel structure comprising a first, second, and third pixel area with specific electrode and switch configurations, utilizing a liquid crystal capacitive voltage divider to create distinct voltage levels without reducing aperture ratio, achieved through a matrix arrangement of pixel units on an array substrate and a color filter substrate with a common electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If array substrate capacitors are designed to control voltage inconsistency between first pixel area and second pixel area, then color distortion at large viewing angle is improved, but aperture ratio of pixel structure is reduced
Solution Approach 1:
The invention extracts the capacitor function from the array substrate and relocates it to the color filter substrate. By placing the capacitor on the color filter substrate, the array substrate is freed from capacitor occupation, allowing the pixel electrode area to be maximized without sacrificing aperture ratio, while still achieving voltage compensation for low skew effect
Solution Approach 2:
The invention changes the spatial dimension by moving the capacitor from the array substrate plane to the color filter substrate plane. This dimensional relocation allows the capacitor to be positioned in a different layer, eliminating the conflict between capacitor area and pixel electrode area, thus maintaining high aperture ratio while achieving voltage control
2Object-affected harmful factors
If data lines are increased to control first pixel area and second pixel area separately, then color distortion is improved, but driver cost increases
Solution Approach 1:
The invention merges the control of first pixel area and second pixel area into a single data line by using a shared pixel electrode. The capacitor on the color filter substrate provides the necessary voltage differentiation, eliminating the need for separate data lines and reducing driver complexity while maintaining low skew performance
Solution Approach 2:
The single data line serves multiple functions by controlling both first pixel area and second pixel area through the shared pixel electrode. The capacitor provides additional voltage control functionality, making the system more versatile and reducing the need for dedicated control lines for each pixel area
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 achieves low skew without reducing aperture ratio, thereby avoiding color distortion at large viewing angles by creating distinct voltage levels between pixel areas using a liquid crystal capacitive voltage divider.
Implementation Method 1
a liquid crystal capacitive voltage divider is formed between the third pixel electrode and the common electrode with the liquid crystal layer as media; the liquid crystal capacitive voltage divider is for lowering the voltage level at the second pixel electrode
Implementation Method 2
a liquid crystal capacitive voltage divider is formed between the third pixel electrode and the common electrode with the liquid crystal layer as media
Data Source
AI summary
The invention provides a pixel structure, including a plurality of pixel units; each pixel unit including: a first, second and third pixel areas, adjacently disposed. First pixel area includes first pixel electrode and first control switch. Second pixel area includes second pixel electrode and second control switch. Third pixel area includes third pixel electrode and third control switch. Third pixel electrode is connected to data signal sequentially through third and the second control switches. Third pixel electrode is connected to second pixel electrode through third control switch so as to make the voltage level at first pixel electrode different from voltage level at second pixel electrode when first control switch, second control switch and third control switch are all conductive.