Array Substrate Data Driving Circuit Independent Voltage Control
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Solution Overview
Problem
In liquid crystal displays (LCDs), manufacturing differences lead to variations in charging effects between pixel electrodes, resulting in issues like flicker and luminance mura, where the common electrode's voltage affects multiple pixels simultaneously, making it difficult to adjust the voltage for each pixel independently.
Innovation Solution
An array substrate with a data driving circuit and method that allows for independent voltage adjustment of the common electrode in each pixel by using a switch unit connected to data lines, enabling time-division multiplexing of data lines to reduce the number of pins and costs, while maintaining separate control over data and common voltages for each pixel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the common electrode is used as a voltage common terminal to load uniform common voltage, then the structure is simple, but the voltage cannot be adjusted for each pixel independently
Solution Approach 1:
The common electrode is segmented into multiple independent common electrode regions, each corresponding to different pixel regions. Each segmented common electrode region can be independently controlled through separate data lines, enabling independent voltage adjustment for different pixel groups while maintaining the overall common electrode structure.
Solution Approach 2:
The data lines are designed to serve dual functions: during first time period, they transmit data voltages to pixel electrodes; during second time period, they transmit common voltages to segmented common electrode regions. This multi-functionality reduces the need for separate voltage control lines while enabling independent pixel-level voltage adjustment.
2Ease of operation
If separate data lines are provided for pixel electrodes and common electrodes, then voltage control is independent, but the number of pins and cost increase
Solution Approach 1:
The data lines operate in a periodic time-division multiplexing manner, alternating between transmitting data voltages to pixel electrodes during a first time period and transmitting common voltages to common electrode regions during a second time period. This periodic switching enables single data lines to perform multiple functions, reducing the total number of pins required.
Solution Approach 2:
The connection relationships between data lines and electrodes are dynamically switched using switch units. During different time periods, the same data line can be dynamically connected to different electrodes (pixel electrode or common electrode region), providing flexible and adaptive voltage control without requiring permanent dedicated connections.
3Manufacturing precision
If manufacturing differences exist in pixel electrode charging, then display quality deteriorates (flicker, luminance mura), but adjusting common electrode voltage affects multiple pixels simultaneously
Solution Approach 1:
The array substrate is divided into multiple pixel regions, each with its own segmented common electrode region. This segmentation allows voltage compensation to be applied locally to specific pixel regions experiencing charging uniformity issues, rather than affecting the entire display panel.
Solution Approach 2:
Different common electrode regions can be assigned different common voltages based on the specific charging characteristics of their corresponding pixel regions. This local quality adjustment enables precise compensation for manufacturing variations in different areas of the display without uniformly affecting all pixels.
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 solution allows for precise adjustment of common electrode voltage for each pixel, improving display quality by reducing gray scale differences and product costs through efficient data line usage and simplified structure.
Implementation Method 1
The first switch unit and/or the second switch unit comprises a thin film transistor, wherein a gate of the thin film transistor is connected to a control terminal, and a source and a drain thereof are connected to one of a first terminal and a second terminal, respectively.
Data Source
AI summary
An array substrate, data driving circuit, data driving method and display apparatus are provided. The array substrate comprises multiple rows of first scan lines, multiple rows of second scan lines, and multiple columns of data lines. The first scan lines and the data lines define crosswise pixel regions in which pixel electrodes, common electrodes, first switch unit and second switch unit are disposed. The pixel electrode is connected to data line adjacent in first row direction through first and second terminals of first switch unit. The common electrode is connected to data line adjacent in second row direction through first and second terminals of second switch unit. The first and second scan lines are connected to control terminals of first and second switch unit within odd-numbered and even-numbered column pixel regions respectively. The amount of the data lines and the number of pins of data driving chip can be reduced.