Display Panel Light Modulation Layer for Viewing Angle Control
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Solution Overview
Problem
Existing display panels lack the ability to effectively prevent others from viewing private image information in public or shared environments, as they do not adequately control the viewing angle of displayed content.
Innovation Solution
A display panel design featuring a light-emitting layer and a light modulation layer with a microlens structure, where the light modulation layer includes a first and second light modulation layer with specific refractive index differences and inclination angles, effectively controlling the viewing angle and brightness of the display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional display panel is used, then the display content is visible to all viewers, but privacy protection is poor
Solution Approach 1:
The light modulation layer is divided into multiple layers (first light modulation layer and second light modulation layer) with different functions. The first layer provides base light modulation while the second layer enhances the privacy protection effect through its specific refractive index and microlens structure, segmenting the light control function across multiple specialized layers
Solution Approach 2:
The microlens structure is selectively applied in the first display area where privacy protection is most needed. The local quality of light modulation is enhanced in this specific region through the microlens structure with specific inclination angles (50°-60°), while other areas maintain standard display characteristics
2Adaptability or versatility
If the viewing angle is widened for better visibility, then more users can view the display, but privacy protection deteriorates
Solution Approach 1:
The refractive index parameter of the second light modulation layer is specifically optimized (greater than the first light modulation layer) to control light propagation angles. The microlens structure with inclination angles of 50°-60° further adjusts the light emission parameters, creating a narrow viewing angle that simultaneously provides privacy protection while maintaining sufficient visibility for intended users
3Illumination intensity
If the brightness is increased for better visibility, then the display is more visible, but energy consumption increases
Solution Approach 1:
The patent replaces the mechanical approach of simply increasing light emission intensity with an optical structure-based solution. The microlens structure and refractive index differences create optical pathways that concentrate and direct light efficiently, achieving high brightness in the intended viewing direction without proportionally increasing overall energy consumption
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 display panel achieves a significant reduction in brightness at large viewing angles, thereby enhancing privacy by limiting visibility of the displayed content to only those within a narrow viewing angle, while maintaining sufficient brightness at normal viewing angles for intended users.
Implementation Method 1
a refractive index of the second light modulation layer is greater than a refractive index of the first light modulation layer
Data Source
AI summary
A display panel and a display device are provided. The display panel includes a first substrate; a light-emitting layer; and a light modulation layer. The light-emitting layer is located between the first substrate and the light modulation layer; the light modulation layer includes a first light modulation layer and a second light modulation layer; the light-emitting layer includes at least one light-emitting element; the first light modulation layer includes at least one first opening; an orthographic projection of the first opening on the first substrate overlaps an orthographic projection of the light-emitting element on the first substrate; the second light modulation layer covers the first opening; and a refractive index of the second light modulation layer is greater than a refractive index of the first light modulation layer.