Privacy Display Panel with Perpendicular Polarizing Layers
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Solution Overview
Problem
Existing display panels with wide viewing angle modes fail to protect user privacy as contents can be seen by individuals around the user, especially when using devices like smartphones or panel computers in public.
Innovation Solution
A display panel configuration that includes a first polarizing layer, a display substrate, and a second polarizing layer with a phase difference film, where the transmission axes of the polarizing layers are perpendicular to each other, allowing only linearly polarized light parallel to the second polarizing layer's axis to be emitted, thereby restricting visibility to perpendicular angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a wide viewing angle display mode is used, then the visibility of display content is improved for users at different angles, but user privacy is compromised as surrounding users can see the content
Solution Approach 1:
The patent segments the polarizing function into multiple distinct layers: a first polarizing layer, a second polarizing layer, and a third polarizing layer, each with specific transmission axis orientations. This segmentation allows independent control of light polarization at different stages, enabling the system to achieve both wide viewing angle and privacy protection by selectively blocking light paths to side viewers while maintaining visibility for front viewers.
Solution Approach 2:
The patent introduces a vertical dimension to privacy protection by stacking multiple polarizing layers with perpendicular transmission axes at different positions (light entrance side and light exit side). This multi-dimensional arrangement creates angle-dependent light transmission characteristics, where light can pass through for front viewers but is blocked for side viewers through the combined effect of multiple polarization filters oriented at different angles.
2Loss of information
If multiple polarizing layers are added to protect privacy, then privacy protection is improved, but the device structure becomes more complex
Solution Approach 1:
The patent makes the display panel structure multi-functional by integrating privacy protection, wide viewing angle, and light control capabilities into a single unified structure. The multiple polarizing layers serve dual purposes: they control light transmission for privacy protection while simultaneously enabling wide viewing angle display. This multi-functionality reduces the need for separate privacy protection components, thereby limiting overall structural complexity despite adding layers.
Solution Approach 2:
The patent achieves privacy protection by changing the transmission axis orientation parameter of polarizing layers. Instead of adding complex mechanical shutters or filters, the solution modifies the optical parameter (transmission axis direction) of existing polarizing layers to create angle-dependent light blocking. This parameter-based approach is simpler than adding entirely new components, as it leverages the existing polarizing layer infrastructure with reoriented axes.
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
Effectively protects user privacy by limiting content visibility to only those viewing from directly perpendicular angles, while maintaining the ability for intended users to see the content, thus enhancing privacy protection.
Implementation Method 1
a first polarizing layer, a display substrate and a second polarizing layer, wherein a transmission axis direction of the first polarizing layer and a transmission axis direction of the second polarizing layer are perpendicular to each other
Implementation Method 2
a phase difference film, wherein the phase difference film is arranged between the first polarizing layer and the second polarizing layer
Data Source
AI summary
The embodiment of the present invention provides a display panel, which belongs to the field of display technology. The display panel comprises: a first polarizing layer, a display substrate, a second polarizing layer and a phase difference film; wherein the first polarizing layer is arranged at one side of the display substrate, and the first polarizing layer is arranged between the second polarizing layer and the display substrate, a transmission axis direction of the first polarizing layer and a transmission axis direction of the second polarizing layer are perpendicular to each other; the phase difference film is arranged between the first polarizing layer and the second polarizing layer. The present invention arranges a second polarizing layer and a phase difference film on the basis of the existing display panel, such that only the linearly polarized light whose polarizing direction is parallel to the transmission axis direction of the second polarizing layer can be emitted from the display panel, hence, the user whose viewing angle is perpendicular to the display panel can see the content in the display panel, while the user whose viewing angle is in other directions cannot see the contents in the display panel, thereby protecting the user's privacy effectively.