Backlight Module Light Shielding for Wide-Angle Bright Lines
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Solution Overview
Problem
The side-incident type backlight modules in display devices cause bright lines with a large viewing angle due to light leakage from the light guide plate.
Innovation Solution
A light shielding member with a light reflecting layer and a light absorbing layer is applied on the light shielding surface of the light guide plate to reflect and absorb light rays, preventing them from escaping and forming bright lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a side-incident type backlight module is used to reduce overall thickness, then the display device becomes thinner, but bright lines with large viewing angle are generated due to light leakage
Solution Approach 1:
A light shielding member is introduced as an intermediary component between the light guide plate and the display panel. This member includes a light reflecting layer and a light absorbing layer that work together to intercept and manage light rays, preventing them from leaking and forming bright lines while maintaining the thin profile of the side-incident backlight module
Solution Approach 2:
The light shielding member converts the harmful light leakage into beneficial effects by using the light reflecting layer to redirect stray light back into the light guide plate for useful illumination, while the light absorbing layer captures and absorbs remaining stray light, transforming the problematic light rays into useful or neutral elements
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 effectively reduces light leakage, eliminating bright lines and enhancing the display quality by ensuring uniform light distribution.
Implementation Method 1
The light shielding member includes a light reflecting layer and a light absorbing layer. The light reflecting layer side can reflect light rays back into the light guide plate
Implementation Method 2
The light absorbing layer side can absorb light rays escaping from the light guide plate
Data Source
Figure 1~2
Figure 3~4
AI summary
A backlight module, a display module and a display device are provided in the present disclosure, which belong to the technical field of display devices. The display device includes a light guide plate and a light-shielding member. The light guide plate includes a light exiting surface and a bottom surface that are oppositely arranged, and a light incident surface and a light shielding surface both connected with the light exiting surface and the bottom surface. The light shielding member is disposed on the light shielding surface, where the light-shielding member includes a light reflecting layer and a light absorbing layer, and the light-absorbing layer is located on a side of the light reflecting layer away from the light shielding surface. The backlight module provided in the present disclosure is capable of avoiding a phenomenon of the appearance of bright lines having large viewing angle.