Prism Sheet Non-Orthogonal View Angle Adjustment
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Solution Overview
Problem
Conventional orthogonal view displays are inadequate for modern portable electronic devices, as users often need to share screen images at non-orthogonal angles, requiring a backlight module and liquid crystal display that can emit light at non-orthogonal view angles.
Innovation Solution
A backlight module incorporating a prism sheet with prism structures that alter light-emitting angles by adjusting the angles between the prism structures and optical surfaces, allowing for emission at non-orthogonal view angles and varying orientations to adjust light intensity and view angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional orthogonal view display is used, then the display structure is simple, but the display cannot meet non-orthogonal view requirements
Solution Approach 1:
A prism sheet is introduced as an intermediary component between the light guide plate and the display screen. The prism sheet includes multiple prism structures with specific geometric configurations that redirect light at non-orthogonal angles, enabling multi-angle viewing without fundamentally changing the backlight module structure
Solution Approach 2:
The invention changes the geometric parameters of the prism structures, specifically the first and second angles formed by the prism surfaces with the optical surface. By adjusting these angles (e.g., 45 degrees or within specific ranges), the light emission angles are modified to achieve non-orthogonal view capabilities
2Ease of operation
If prism structures with fixed angles are used, then the manufacturing is simple, but the light emitting intensity cannot be adjusted
Solution Approach 1:
The invention provides adjustable light intensity by varying the prism structure angles. Different angle configurations (first angle and second angle combinations) allow dynamic adjustment of light emission intensity and direction, enabling adaptation to different viewing conditions and requirements
3Adaptability or versatility
If the ridge is exactly vertical to the light-incident surface, then the structure is symmetric and simple, but the view angle ratio cannot be adjusted
Solution Approach 1:
The invention introduces asymmetric prism structures where the first angle and second angle are different, and the ridge forms a non-zero angle (≤20 degrees) with the normal of the light-incident surface. This asymmetric configuration enables adjustment of the view angle ratio and light distribution in different directions
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
Enables light emission at non-orthogonal view angles, adjusting light intensity and view angle ratios, thereby meeting the requirements of various portable electronic devices.
Implementation Method 1
a prism sheet with prism structures is used to change light-emitting angles of light passing through a light guide plate
Data Source
AI summary
A backlight module and a liquid crystal display are described. The backlight module includes a light guide plate, a light source and a prism sheet. The light guide plate includes a light-emitting surface, a light-incident surface and an axis. The light-incident surface is connected to the light-emitting surface. The axis is normal to the light-incident surface. The light source emits light towards the light-incident surface. The prism sheet is disposed on the light guide plate and includes a first optical surface and a plurality of prism structures which are disposed on the first optical surface. Each of the prism structures has a first surface and a second surface. The first surface and the second surface are connected to form a ridge. The ridge is vertical to the light-incident surface, or an angle included between the ridge and the axis is smaller than or equal to 20 degrees.