Backlight Prism Sheet Stacking for Two-Direction Luminance
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Solution Overview
Problem
Existing edge-lit backlights lack sufficient luminance improvements in two directions required for displays capable of presenting different images in two directions.
Innovation Solution
A backlight design incorporating a light guide plate, a first prism sheet with V-grooves, and a second prism sheet with adjacent V-grooves, configured to enhance luminance in two directions by directing light peaks away from the vertical axis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional edge-lit backlight design is used, then device simplicity is maintained, but luminance in two directions is insufficient
Solution Approach 1:
The backlight structure is segmented into multiple functional layers: light guide plate, first prism sheet with first grooves, and second prism sheet with second grooves. Each layer performs a specific function in directing light, allowing the system to achieve two-directional luminance enhancement through cumulative effect of individual components rather than requiring a completely new complex design
Solution Approach 2:
The invention introduces directional control in the horizontal dimension by adding grooves that extend in the second direction (horizontal), complementing the vertical grooves. This dimensional addition transforms the light distribution from primarily vertical to two-directional (vertical and horizontal), achieving the desired luminance pattern without proportionally increasing complexity
2Illumination intensity
If prism sheets with grooves are added to enhance luminance, then luminance in two directions is improved, but device complexity increases
Solution Approach 1:
The first prism sheet and second prism sheet are combined in a stacked configuration where the second grooves are positioned adjacent to the first grooves. This merging of multiple prism sheets creates a unified optical system that achieves two-directional light distribution with enhanced luminance intensity (up to 1.03 times improvement) while maintaining a compact structure
Solution Approach 2:
The grooves in both prism sheets are designed with curved cross-sections (first grooves with first curvature radius, second grooves with second curvature radius). This curvature design optimizes light reflection and distribution patterns, enhancing luminance in specific directions while the adjacent positioning of grooves from both sheets creates a coordinated optical effect that improves overall efficiency
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 design achieves improved luminance in two directions, enhancing the display's capability to present distinct images, with luminance intensity increased by up to 1.03 times compared to conventional designs.
Implementation Method 1
a first prism sheet overlapping with the light guide plate, the first prism sheet including a flat surface directly facing the plate surface, the first prism sheet including a first prism surface on a side opposite to the flat surface, the first prism surface including first grooves
Implementation Method 2
a second prism sheet overlapping with the first prism sheet, the second prism sheet including a second prism surface directly facing the first prism surface, the second prism sheet including a flat surface on a side opposite to the second prism surface, the second prism surface including second grooves
Data Source
AI summary
A backlight includes: a first prism sheet including a first prism surface on a side opposite to the flat surface, the first prism surface including first grooves, the first grooves being adjacent in a first direction and extending in a second direction; and a second prism sheet including a second prism surface directly facing the first prism surface, the second prism sheet including a flat surface on a side opposite to the second prism surface, the second prism surface including second grooves, the second grooves being adjacent in the first direction and extending in the second direction. In light distribution characteristics on a first vertical plane spreading in the first direction and a vertical direction that is perpendicular to both the first direction and the second direction, peaks of luminous intensity are observed in two directions excluding the vertical direction.