Dual Light-Blocking Pixel Structure for Privacy Display Panels
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Solution Overview
Problem
Existing display devices lack effective privacy protection mechanisms, particularly in light emitting display devices that do not utilize backlights, and there is a need for improved light blocking layers to enhance privacy.
Innovation Solution
Incorporating multiple light blocking layers with specific hole configurations and divided portions to overlap pixel electrodes, along with varying pixel electrode sizes and transmission portions, to manage light transmission and provide privacy protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single light blocking layer is used in light emitting display devices, then the device structure is simple, but privacy protection capability is insufficient
Solution Approach 1:
The light blocking function is segmented into two separate layers: a first light blocking layer with holes positioned at pixel electrode locations, and a second light blocking layer with light blocking patterns positioned at non-pixel areas. This segmentation allows each layer to perform its specific function optimally, thereby enhancing overall privacy protection capability while maintaining reasonable structural complexity
Solution Approach 2:
The solution transitions from a single-layer approach to a multi-layer approach, adding a vertical dimension to the light blocking structure. The first light blocking layer is disposed at a first position and the second light blocking layer is disposed at a second position in the vertical direction, creating a three-dimensional light blocking architecture that significantly improves privacy protection
2Reliability
If light blocking patterns are disposed close to pixel electrodes, then light blocking efficiency is improved, but color filter thickness variation increases
Solution Approach 1:
The light blocking function is divided between two layers: the first light blocking layer with holes at pixel electrode positions allows color filters to be positioned accurately without interference, while the second light blocking layer with patterns at non-pixel areas provides the necessary light blocking. This segmentation eliminates the conflict between light blocking efficiency and color filter positioning precision
Solution Approach 2:
The first light blocking layer acts as an intermediary structure that provides reference positions (holes) for color filter placement. These holes serve as guides that ensure color filters are positioned accurately at pixel electrode locations, while the second light blocking layer provides additional light blocking without interfering with color filter thickness uniformity
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 effectively reduces transmittance differences and enhances privacy by controlling light visibility, ensuring secure viewing angles and privacy protection modes in display devices.
Implementation Method 1
a first light blocking layer disposed in the display area and including a plurality of holes disposed to overlap the plurality of pixel electrodes
Data Source
AI summary
A display device includes a display area in which a plurality of first pixels and second pixels including a plurality of pixel electrodes spaced apart from each other are disposed, a first light blocking layer disposed in the display area and including a plurality of holes disposed to overlap the pixel electrodes, a plurality of color filters disposed on the first light blocking layer to correspond to the holes, and a second light blocking layer disposed on the color filter and disposed to correspond to the pixel electrodes of the second pixels, the first light blocking layer including a plurality of divided portions disposed around the holes of the second pixel and penetrating the first light blocking layer, and the color filters disposed in the second pixel and disposed to cover the hole of the first light blocking layer, where the divided portions are disposed to correspond to the holes.