Prism Sheet with Variable Vertex Angles for Display Brightness
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Solution Overview
Problem
Existing prism sheets in backlight modules limit the viewing angle due to parallel prism structures with right-angle vertex angles, failing to meet energy efficiency and viewing angle standards such as TCO.
Innovation Solution
A prism sheet with a base layer and prisms arranged in a specific configuration, where the vertex angles in the middle region are smaller than those in the edge regions, allowing for improved brightness and reduced energy consumption while optimizing the horizontal viewing angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If prism structures with right-angle vertex angles are used to improve front viewing angle brightness, then the display brightness at front viewing angle is improved, but the viewing angle of the display module is limited
Solution Approach 1:
The patent applies local quality by differentiating the vertex angles of prisms in different regions of the backlight module. Specifically, prisms in the middle region have a first vertex angle (e.g., 60-80 degrees) while prisms in the edge region have a second vertex angle (e.g., 80-90 degrees) that is larger than the first. This local differentiation allows the middle region to provide high brightness at front viewing angles while the edge region expands the horizontal viewing angle, thereby resolving the contradiction between front viewing angle brightness and overall viewing angle adaptability.
2Ease of manufacture
If prism structures with uniform vertex angles are used to simplify manufacturing, then the manufacturing process is simplified, but the horizontal viewing angle cannot be optimized
Solution Approach 1:
The patent implements local quality by dividing the backlight module into a middle region and an edge region, with each region having prisms with different vertex angles. The middle region uses prisms with a first vertex angle optimized for brightness, while the edge region uses prisms with a second, larger vertex angle optimized for viewing angle. This regional differentiation optimizes the horizontal viewing angle while maintaining manufacturing feasibility through a systematic approach.
3Use of energy by stationary object
If energy consumption is reduced by using prism sheets to improve backlight efficiency, then energy consumption of the backlight module is reduced, but the viewing angle standards such as TCO cannot be met
Solution Approach 1:
The patent resolves this contradiction by applying local quality through regional prism configuration. The middle region prisms with smaller vertex angles maximize light extraction efficiency and brightness, reducing energy consumption. Simultaneously, the edge region prisms with larger vertex angles ensure that viewing angle standards such as TCO are met by expanding the horizontal viewing angle. This differentiated approach allows the backlight module to achieve both energy efficiency and viewing angle compliance.
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 enhances the brightness of the backlight module, reduces energy consumption, and optimizes the horizontal viewing angle, enabling the display module to meet energy efficiency standards like TCO and improve display effects.
Implementation Method 1
a refractive index of the prism sheet is between 1.6 and 1.7
Data Source
AI summary
The present application provides a prism sheet and a display module. The prism sheet includes a base layer and a plurality of prisms arranged on the base layer. The prism sheet is divided into a middle region and edge regions. By making the vertex angles of the portions of the prisms in the middle region smaller than the vertex angles in the edge regions, it may be possible to improve the brightness of the backlight module in the display module and optimize the horizontal viewing angle of the display module.