Display Panel Metal Layer and Polarizer for Viewing Angle Uniformity
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Solution Overview
Problem
Conventional OLED display products face issues with lower reflection rate and color shift due to ambient light, particularly affecting black uniformity, especially at large view angles, despite the use of polarizers to mitigate these effects.
Innovation Solution
A display panel design featuring a metal layer with source/drain layers arranged along specific angles and a polarizer comprising a line polarization layer and phase compensation layer, where the phase compensation layer includes stacked half-wave and quarter-wave plates, enhances light extinction and reflection control, ensuring consistent reflection rates and color shifts across all viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a polarizer is added to reduce ambient light reflection, then color shift is reduced, but light extinction is insufficient at large view angles
Solution Approach 1:
The patent combines multiple functional layers including a polarizer layer, a first compensation layer with positive birefringence, and a second compensation layer with negative birefringence. This composite structure works synergistically to achieve both color shift correction and improved light extinction at large view angles, overcoming the limitations of a single polarizer layer.
Solution Approach 2:
The patent introduces a first source/drain layer and a second source/drain layer with different orientations and optical properties. The first source/drain layer has a first heading angle and the second source/drain layer has a second heading angle different from the first. This local differentiation in optical characteristics allows the display panel to achieve uniform light extinction and color shift correction across different viewing angles.
2Illumination intensity
If the polarizer coefficients are adjusted to improve black uniformity, then reflection rate is reduced, but black uniformity improvement is limited
Solution Approach 1:
The patent employs a composite structure comprising a polarizer layer combined with first and second compensation layers having different birefringence signs. This multi-layer composite approach achieves superior black uniformity and reflection rate control compared to adjusting polarizer coefficients alone, as the compensation layers work together to correct optical path differences at various viewing angles.
Solution Approach 2:
The patent changes the optical parameters of the display panel by introducing compensation layers with specific birefringence values and orientations. The first compensation layer has positive birefringence and the second compensation layer has negative birefringence, allowing precise control of light polarization and phase compensation to achieve uniform black levels across wide viewing angles.
3Illumination intensity
If source/drain layers are arranged to increase reflection area at first heading angle, then light extinction at first heading angle is improved, but device complexity increases
Solution Approach 1:
The patent integrates the first source/drain layer and second source/drain layer as integral parts of the display panel structure, where each layer serves multiple functions: electrical conduction, optical compensation, and viewing angle control. The first source/drain layer is arranged along a first heading angle and the second source/drain layer is arranged along a second heading angle, creating a composite structure that achieves improved light extinction without requiring separate compensation components.
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 significantly improves black uniformity by optimizing light extinction and reflection characteristics, reducing ambient light impact and achieving better contrast and color stability across different viewing angles.
Implementation Method 1
a polarizer is often pasted on the OLED panel
Implementation Method 2
the inside metal electrode reflects parts of the incident light
Implementation Method 3
a phase compensation layer, where the phase compensation layer includes stacked half-wave and quarter-wave plates
Data Source
AI summary
A display panel and a display device are disclosed. The display panel includes a display panel body and a polarizer, placed on the display panel body in a direction of outgoing light. The display panel body includes a metal layer having a reflection area corresponding to a first heading angle larger than a reflection area corresponding to a second heading angle. A light extinction of the polarizer corresponding to the first heading angle is greater than a light extinction of the polarizer corresponding to the second heading angle. This could remedy the light extinction of the polarizer in the second heading angle such that the display panel could have similar reflection rates and color shifts in all heading angles.