Multi-Layer Prism Optical Sheet for Display Backlight
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Solution Overview
Problem
Display devices with LCD panels face issues of side light leakage due to the use of traditional optical sheets, which affect the frontal brightness and the implementation of full black color, leading to compromised image quality and viewing angles.
Innovation Solution
The implementation of a multi-layered optical sheet structure comprising first, second, and third prism sheets with specific triangular cross-sections and orientations, along with a reflective polarizing sheet, to optimize light distribution and reduce side light leakage, thereby enhancing image quality and viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a traditional single-layer optical sheet with prisms is used to increase frontal brightness, then the distribution of light is improved, but side light leakage occurs
Solution Approach 1:
The optical sheet is divided into multiple layers (first, second, and third prism sheets) with different prism orientations and configurations. Each layer segments the light control function, allowing the first layer to manage vertical distribution, the second layer to manage horizontal distribution, and the third layer to refine vertical distribution, thereby achieving comprehensive light control that reduces side leakage while maintaining frontal brightness
Solution Approach 2:
Different regions of the optical system are assigned different optical properties through the multi-layer prism structure. The first prism sheet has prisms oriented in the vertical direction for vertical light control, the second prism sheet has prisms oriented in the horizontal direction for horizontal light control, and the third prism sheet refines vertical control. This local differentiation of optical functions enables precise control of light distribution to eliminate side leakage while preserving frontal brightness
2Illumination intensity
If a prism sheet is used to improve light distribution, then frontal brightness increases, but image quality and black color implementation deteriorate due to side light leakage
Solution Approach 1:
The optical sheet is divided into multiple layers (first, second, and third prism sheets) with different prism orientations and configurations. Each layer segments the light control function, allowing the first layer to manage vertical distribution, the second layer to manage horizontal distribution, and the third layer to refine vertical distribution, thereby achieving comprehensive light control that reduces side leakage while maintaining frontal brightness
Solution Approach 2:
Different regions of the optical system are assigned different optical properties through the multi-layer prism structure. The first prism sheet has prisms oriented in the vertical direction for vertical light control, the second prism sheet has prisms oriented in the horizontal direction for horizontal light control, and the third prism sheet refines vertical control. This local differentiation of optical functions enables precise control of light distribution to eliminate side leakage while preserving frontal brightness
3Device complexity
If a traditional optical sheet structure is used, then the device complexity is low, but the viewing angles and color reproducibility are limited
Solution Approach 1:
The optical sheet is divided into multiple layers (first, second, and third prism sheets) with different prism orientations and configurations. Each layer segments the light control function, allowing the first layer to manage vertical distribution, the second layer to manage horizontal distribution, and the third layer to refine vertical distribution, thereby achieving comprehensive light control that reduces side leakage while maintaining frontal brightness
Solution Approach 2:
Different regions of the optical system are assigned different optical properties through the multi-layer prism structure. The first prism sheet has prisms oriented in the vertical direction for vertical light control, the second prism sheet has prisms oriented in the horizontal direction for horizontal light control, and the third prism sheet refines vertical control. This local differentiation of optical functions enables precise control of light distribution to eliminate side leakage while preserving frontal brightness
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 proposed solution effectively reduces side light leakage, improves liquid crystal color reproducibility, and ensures uniform brightness across various viewing angles, enhancing the overall image quality and black color implementation in display devices.
Implementation Method 1
The prism sheet may increase the frontal brightness of the display device by refracting light
Implementation Method 2
a second prism sheet including a plurality of second prisms arranged in a second direction intersecting the first direction
Implementation Method 3
a third prism sheet including a plurality of third prisms arranged in the first direction, and disposed in front of the second prism sheet
Implementation Method 4
The optical sheet may further include a reflective polarizing sheet disposed between the second prism sheet and the third prism sheet
Data Source
AI summary
A display device includes a backlight unit configured to emit light, a display panel disposed in front of the backlight unit, and an optical sheet disposed between the backlight unit and the display panel. The optical sheet may include a first prism sheet including a plurality of first prisms arranged in a first direction, a second prism sheet including a plurality of second prisms arranged in a second direction intersecting the first direction, and disposed in front of the first prism sheet; and a third prism sheet including a plurality of third prisms arranged in the first direction, and disposed in front of the second prism sheet.