Common Electrode Extension Over Data Line Prevents Light Leakage
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Solution Overview
Problem
In touch type liquid crystal display devices, light leakage occurs at the boundary of touch blocks due to voltage differences between data lines and common electrodes, requiring an additional blocking line to prevent this issue, which complicates design and manufacturing, especially in high-resolution or narrow-bezel models, and increases the load on data lines, potentially leading to defects.
Innovation Solution
The design includes a common electrode that extends over the data line and into adjacent pixel regions, eliminating the need for a blocking line by positioning the boundary between touch blocks within the pixel regions rather than over the data line, thereby preventing light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a blocking line is added over the data line at the touch block boundary to prevent light leakage, then light leakage is blocked, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent extracts and removes the blocking line component from the display structure. Instead of adding a separate blocking line over the data line, the invention repositions the touch block boundaries to align with pixel region boundaries, eliminating the need for the blocking line while still preventing light leakage through proper structural arrangement.
Solution Approach 2:
The patent segments the display into distinct pixel regions with clear boundaries. By defining touch blocks based on pixel region boundaries rather than arbitrary divisions, the structure naturally prevents light leakage at boundaries without requiring additional blocking elements, thus simplifying the overall device structure.
2Object-affected harmful factors
If a blocking line is added to prevent light leakage, then light leakage is blocked, but manufacturing precision requirements increase
Solution Approach 1:
The patent merges the touch block boundary definition with the pixel region boundary. By making these two boundaries coincide, the structure inherently prevents light leakage without requiring separate alignment of blocking lines, thereby reducing manufacturing precision requirements and simplifying the production process.
3Object-affected harmful factors
If a blocking line is added over the data line, then light leakage is blocked, but the load on the data line increases
Solution Approach 1:
The patent removes the blocking line that was previously placed over the data line. By eliminating this additional conductive element, the electrical load on the data line is reduced, improving signal integrity and reducing the risk of defects while maintaining light leakage prevention through structural boundary alignment.
4Object-affected harmful factors
If a blocking line is added to prevent light leakage, then light leakage is blocked, but ease of manufacture decreases
Solution Approach 1:
Instead of adding a blocking line to prevent light leakage, the patent inverts the approach by strategically positioning touch block boundaries to align with pixel region boundaries. This inversion eliminates the need for additional blocking structures, making the manufacturing process simpler and more straightforward while still achieving the light leakage prevention goal.
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 configuration simplifies the design and manufacturing process, allows for easier production of high-resolution and narrow-bezel models, and reduces the risk of defects by eliminating the need for additional blocking lines and associated increased load on data lines.
Implementation Method 1
the common electrode 71 is supplied with a common voltage and functions as an opposing electrode to generate an electric field together with the pixel electrode 51
Implementation Method 2
touch type liquid crystal display device (LCD)
Data Source
AI summary
A touch type liquid crystal display device includes a first pixel region and a second pixel region that neighbor each other with a data line therebetween, and each pixel region includes a thin film transistor and a pixel electrode connected to the thin film transistor. The touch type liquid crystal display device further includes a first touch block and a second touch block including the first pixel region and the second pixel region, respectively, a common electrode that is arranged in a same substrate as the pixel electrode, and is located in each of the first and second touch blocks, and a sensing line that is connected to the common electrode of each of the first and second touch blocks, wherein the common electrode of the first touch block goes over the data line and extends into the second pixel region.