Display Panel Common-Electrode Segmentation for Voltage Uniformity
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Solution Overview
Problem
The capacitive coupling effect between the common electrode layer and other conductive layers in display panels causes a delay in electrical signal transmission, leading to voltage level deviations and insufficient storage capacitors, affecting display quality as panel size and resolution increase.
Innovation Solution
The display panel design includes a first substrate with a first common electrode layer and bridge patterns connected to pixel structures, a second substrate with a second common electrode layer and spacers, and electrical connections through transfer patterns, reducing voltage level differences and improving uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the common electrode layer is used to form storage capacitors with pixel electrodes, then the display panel achieves basic capacitive function, but the capacitive coupling effect between the common electrode layer and other conductive layers causes voltage level deviation and signal transmission delay
Solution Approach 1:
The common electrode system is segmented into a first common electrode layer on the first substrate and a second common electrode layer on the second substrate. This segmentation allows the common electrode function to be distributed across two separate layers, reducing the capacitive coupling effect between the common electrode and other conductive layers while maintaining the storage capacitor function through the connection via spacers and bridge patterns.
Solution Approach 2:
Spacers are introduced as intermediary elements to connect the first common electrode layer and the second common electrode layer. These spacers serve as mediators that establish electrical connection between the two common electrode layers while minimizing parasitic capacitance effects, thereby reducing voltage level deviation and improving signal transmission.
2Area of stationary object
If the display panel size and resolution are increased, then the display quality is improved, but the capacitive coupling effect causes greater voltage level deviation from the electrical signal source
Solution Approach 1:
By segmenting the common electrode into two separate layers on different substrates, the patent reduces the overall capacitive coupling effect that increases with panel size. This segmentation allows larger panels to maintain better voltage level uniformity across the display area.
Solution Approach 2:
The patent transitions from a single-plane common electrode structure to a three-dimensional stacked structure with common electrode layers on both substrates. This dimensional change allows the common electrode system to span across the entire panel area while maintaining electrical uniformity through the vertical connection via spacers.
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 design effectively reduces voltage level differences across the common electrode layer, enhancing display panel performance by improving electrical properties and storage capacitor efficiency.
Implementation Method 1
the first common electrode layer and the bridge patterns are disposed on the first substrate and are electrically connected to each other... The first spacers are disposed on the second substrate and respectively abut the bridge patterns along the stacking direction... The second common electrode layer is disposed on the second substrate and covers the first spacers to be electrically connected to the bridge patterns
Data Source
AI summary
A display panel including a first substrate, a second substrate, a liquid crystal layer, data lines, scan lines, pixel structures, a first common electrode layer, bridge patterns, first spacers, and a second common electrode layer is provided. The liquid crystal layer is disposed between the first substrate and the second substrate. The data lines and the scan lines are disposed on the first substrate and intersect each other. Each of the pixel structures has an active device and a pixel electrode. The first common electrode layer and the bridge patterns are disposed on the first substrate and electrically connected to each other. The first common electrode layer overlaps the pixel structures. The first spacers are disposed on the second substrate and respectively abut the bridge patterns. The second common electrode layer disposed on the second substrate covers the first spacers to electrically connect the bridge patterns.