Display Panel Capacitor Ratio and Light-Blocking Layer
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Solution Overview
Problem
Conventional LCD panels, such as TN, IPS, and FFS, suffer from narrow viewing angles, low light transmittance, image retention, and light leakage, limiting their applications.
Innovation Solution
A display panel design featuring a symmetrical capacitor structure with a specific capacitance ratio between 0.7 and 1.3, combined with a light-blocking stacking layer, improves transmittance uniformity and shields light leakage without affecting brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional LCD panel designs (TN, IPS, FFS) are used to achieve wide viewing angles, then viewing angle is improved, but light transmittance decreases and image retention occurs
Solution Approach 1:
The capacitor structure is segmented into two separate capacitors (first capacitor between first common electrode and pixel electrode, second capacitor between second common electrode and pixel electrode) instead of a single capacitor. This segmentation allows independent optimization of each capacitor's characteristics to improve light transmittance while maintaining wide viewing angle performance
Solution Approach 2:
The patent uses asymmetric capacitor design where the first and second capacitors have different capacitance values (ratio between 0.7-1.3), with different electrode configurations and dielectric layer arrangements. This asymmetric design optimizes the electric field distribution to reduce image retention while maintaining wide viewing angles
2Adaptability or versatility
If conventional LCD panel designs are used to achieve wide viewing angles, then viewing angle is improved, but light leakage increases
Solution Approach 1:
The harmful light leakage is extracted and blocked by introducing a light-blocking stacking layer with light-shielding patterns positioned between the common electrodes and pixel electrodes. This separates the light-blocking function from the display function, allowing the display medium to maintain wide viewing angle while the light-blocking layer eliminates light leakage
Solution Approach 2:
A light-blocking stacking layer serving as an intermediary element is introduced between the electrodes and the display medium. This intermediary layer blocks light leakage paths without interfering with the optical performance and wide viewing angle characteristics of the display medium
3Object-generated harmful factors
If light-blocking stacking layer is added to shield light leakage, then light leakage is reduced, but device complexity increases
Solution Approach 1:
The light-blocking stacking layer is merged with the existing electrode structures and dielectric layers, combining multiple functions (light blocking, electrical insulation, mechanical support) into a single integrated component. This reduces the need for separate light-blocking elements and simplifies the overall device structure
Solution Approach 2:
The light-blocking stacking layer is designed to perform multiple functions simultaneously: blocking light leakage, providing electrical insulation between electrodes, and serving as a structural support layer. This multi-functionality reduces the need for additional separate components, thereby reducing device 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 design enhances transmittance uniformity, prevents image retention, and effectively shields light leakage in dark modes without impacting brightness in bright modes, thereby improving display performance.
Implementation Method 1
a first capacitance exists between the first common electrode and the pixel electrode
Implementation Method 2
a second capacitance exists between the second common electrode and the pixel electrode
Implementation Method 3
The light-shielding layer is configured to shielding the light leakage between the common line and the signal line in the front view direction
Implementation Method 4
The transparent electrode layer and the gate electrode of the active switching device have a voltage difference forming a vertical electric field, which can drives the liquid crystal molecules disposed between the transparent electrode layer and the gate electrode to incline
Data Source
AI summary
A display panel includes a first substrate structure, a second substrate structure and a non-self-luminous display medium layer. The first substrate structure includes a first substrate, a first common electrode, a pixel electrode and a first alignment film. The second substrate structure is disposed opposite to the first substrate structure. The second substrate structure includes a second substrate, a second common electrode and a second alignment film. The non-self-luminous display medium layer is interposed between the first alignment film and the second alignment film. A first capacitance is formed between the first common electrode and the pixel electrode, a second capacitance is formed between the pixel electrode and the second common electrode, and a ratio of the second capacitance to the first capacitance is substantially between 0.7 and 1.3.