Backlight Module Light Blocking Element for Frame Recess Leakage
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Solution Overview
Problem
Wide viewing angles in LCDs lead to severe light leakage issues, particularly at notches or through-holes in the frame, which existing backlight modules struggle to prevent effectively.
Innovation Solution
Incorporating a light blocking or reducing element, such as an adhesive tape, rubber, silicone, or materials like PET and PMMA, into recesses on the frame to block or reduce light leakage, utilizing recesses like notches or through-holes to house these elements and prevent light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the viewing angle is enlarged to 85 degree, then the viewing angle requirement is satisfied, but light leakage occurs at the notch or through-hole
Solution Approach 1:
A light blocking element is introduced as an intermediary component between the light source and the external environment. This element specifically targets the notch or through-hole areas to block light leakage while allowing the wide viewing angle to be maintained, thus resolving the contradiction between viewing angle requirements and light leakage prevention
Solution Approach 2:
The light blocking element is selectively placed only at the notch or through-hole positions where light leakage occurs, rather than covering the entire frame. This localized approach prevents light leakage at critical areas while maintaining the overall wide viewing angle performance of the display
2Ease of manufacture
If a notch or through-hole is formed on the frame for optical film assembly, then the assembly ease is improved, but light leakage problem occurs
Solution Approach 1:
The light blocking element serves as a mediator that allows the frame to maintain its notched or holed structure for easy assembly, while simultaneously preventing the harmful light leakage effect at these same locations
Solution Approach 2:
The light blocking function is extracted as a separate, independent element that can be added to the frame structure without modifying the frame's assembly features. This allows the frame to retain its notched design for easy optical film assembly while the extracted light blocking element handles the light leakage prevention
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
Effectively reduces light leakage by blocking or absorbing light at recesses, maintaining image quality and adhering to wider viewing angle requirements without compromising luminance or uniformity.
Implementation Method 1
The light blocking element is disposed in the recess in order to block the emitting light of the light source from leaking via the recess
Data Source
AI summary
A backlight module comprises a frame, a light source, an optical film and a light blocking element or a light reducing element. The frame has at least one recess formed on a sidewall thereof. The light source is disposed in the frame and located on one side thereof. The optical film is disposed in the frame and has at least one protrusion portion corresponding to the recess. The light blocking element or the light reducing element is disposed corresponding to the recess. By utilizing the light blocking element or the light reducing element, the light emitting from the light source can be block from leaking through the recess or the amount of the emitting light being reflected by a bezel of the frame can be reduced, whereby the amount of light leaking though the recess can be reduced.