Auxiliary Electrodes for Uniform Electric Fields in In-Cell Touch Panels
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In high-resolution and large-size liquid crystal displays, misalignment between pixel electrodes and common electrode blocks leads to non-uniform electric fields, decreasing luminance and light transmittance due to increased load on the common electrode.
Innovation Solution
An array substrate design with auxiliary electrodes disposed in the same layer as pixel electrodes, electrically connected to sensing lines, which helps in forming a uniform electric field and reduces the load on the common electrode by decreasing the resistance of the sensing line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If pixel electrodes and common electrode blocks are disposed in different layers, then the In-cell touch panel structure is achieved without increasing overall thickness, but layer misalignment occurs causing non-uniform electric fields and decreased luminance
Solution Approach 1:
Auxiliary electrodes are introduced as intermediary elements between the pixel electrodes and common electrode blocks. These auxiliary electrodes compensate for the misalignment effect by providing additional electric field pathways, ensuring uniform electric field distribution across the display panel even when the common electrode layer is shifted relative to the pixel electrode layer.
Solution Approach 2:
The patent modifies the electrical parameters of the system by adding auxiliary electrodes that change the electric field distribution characteristics. By adjusting the positioning and electrical connection of these auxiliary electrodes to sensing lines, the system achieves uniform electric field intensity without requiring precise mechanical alignment between layers.
2Ease of manufacture
If common electrode blocks are reused as touch electrodes, then manufacturing processes are simplified without additional processes, but the load on the common electrode increases significantly
Solution Approach 1:
The touch sensing function is segmented from the common electrode by introducing auxiliary electrodes that are specifically connected to sensing lines. This segmentation allows the common electrode to maintain its display function while the auxiliary electrodes handle the touch sensing function, thereby reducing the electrical load on the common electrode.
Solution Approach 2:
The auxiliary electrodes serve multiple functions: they participate in forming the electric field for display purposes and simultaneously serve as touch sensing elements. This multi-functionality reduces the burden on the common electrode while maintaining both display and touch capabilities.
3Power
If sensing lines have high resistance, then the load on the common electrode increases, but decreasing resistance requires additional design considerations
Solution Approach 1:
Auxiliary electrodes act as intermediary elements that provide low-resistance pathways for sensing signals. By connecting these auxiliary electrodes to sensing lines, the system achieves reduced overall resistance without requiring the sensing lines themselves to be redesigned, thus lowering the load on the common electrode with minimal additional complexity.
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 improves luminance and maintains uniform light transmittance by ensuring consistent electric field intensity across the display panel, even when the common electrode layer is misaligned with the pixel electrode layer, thereby reducing the load on the common electrode.
Implementation Method 1
The luminance of a liquid crystal display panel including the array substrate of the disclosure is improved by means of the electric field formed between the auxiliary electrode and the pixel electrode
Implementation Method 2
because the auxiliary electrode is electrically connected with the sensing line overlapped by the auxiliary electrode, the resistance of the sensing line is decreased, thereby decreasing the load of the common electrode in the liquid crystal display panel
Data Source
AI summary
An array substrate, a liquid crystal display panel and a liquid crystal display device. The array substrate includes: a plurality of pixel units defined by a plurality of intersecting data lines and scanning lines, wherein each of the plurality of pixel units comprises a thin film transistor and a pixel electrode electrically connected with the thin film transistor; a plurality of common electrode blocks disposed in a layer different from the pixel electrode, the common electrode blocks being reused as touch electrodes; a plurality of sensing lines, each of which is electrically connected with one of the common electrode blocks; and a plurality of auxiliary electrodes disposed in the same layer as the pixel electrode, wherein each of the plurality of auxiliary electrodes is disposed between two adjacent pixel electrodes, and overlapped and electrically connected with one of the sensing lines.