Light Guide Plate Convex Ridges for Display Peep Prevention
Solution Overview
Problem
Current display technologies face challenges in reducing the visual angle of display apparatuses to prevent user information leakage without compromising light-emitting luminance, as privacy films absorb light, leading to reduced luminance and poor peep prevention effects.
Innovation Solution
A light emitting module with a light guide plate featuring target convex ridges that totally reflect light, reducing the divergence angle and allowing for converged light emission without the need for privacy films, thereby enhancing luminance and peep prevention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a privacy film is disposed in the display apparatus to reduce the visual angle, then the peep prevention effect is improved, but the light-emitting luminance is reduced due to light absorption
Solution Approach 1:
The patent replaces the privacy film (mechanical/optical filter system) with a light guide plate structure featuring convex ridges that use total internal reflection to control light distribution. This substitution eliminates the need for light-absorbing privacy films while achieving the same peep prevention effect through geometric optical control.
Solution Approach 2:
The patent changes the optical parameters by using a light guide plate with specific convex ridge geometries (height, width, spacing) that control the refraction and reflection of light. By adjusting these geometric parameters, the system achieves narrow visual angle without the light absorption losses associated with privacy films.
2Reliability
If the visual angle is reduced to prevent information leakage, then the peep prevention effect is improved, but the light distribution becomes more divergent requiring privacy films
Solution Approach 1:
The patent uses convex ridges (curved surfaces) on the light guide plate to control light refraction. The curved geometry of the convex ridges naturally focuses and directs light in specific patterns, achieving converged light emission without requiring additional privacy films to manage light distribution.
Solution Approach 2:
The patent introduces a new dimensional approach by using the third dimension (height of convex ridges) to control light propagation. Instead of managing light distribution in a single plane, the convex ridge structure uses vertical geometry to refract and direct light, creating converged emission patterns that improve peep prevention without compromising luminance.
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 light emitting module achieves improved light-emitting luminance and better display effects by emitting more converged light, reducing the visual angle of the display apparatus and preventing information leakage without the use of privacy films.
Implementation Method 1
each of the target convex ridges is configured to totally reflect light emitted from the target side surface to the light guide plate to the second plate surface from a target ridge surface
Data Source
AI summary
Provided are a light emitting module and a display apparatus. The light emitting module includes: a light emitting unit and a light guide plate; the light guide plate includes a first plate surface and a second plate surface opposite to each other, and a plurality of side surfaces; the light emitting unit is configured to emit light to the light guide plate from the target side surface; the first plate surface includes a plurality of target convex ridges disposed in sequence along a direction away from the light emitting unit; each target convex ridge is configured to totally reflect light emitted from the target side surface into the light guide plate to the second plate surface, angles between the target ridge surfaces of the plurality of target convex ridges and a thickness direction of the light guide plate tends to decrease.