Mould Frame Light Reflection Control for Slim LCD Modules
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Solution Overview
Problem
In slim liquid crystal display modules without top and bottom cases, light leakage and durability issues arise due to the absence of a structural frame, leading to brightness inconsistencies and potential damage to LED packages during assembly or handling.
Innovation Solution
A mould frame made of white resin with a light blocking tape and an extension unit that controls light reflection, coupled with an LED fixing unit to prevent light leakage and enhance durability by absorbing stray light and guiding LED arrays correctly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a top case and bottom case are used to couple the liquid crystal display panel and back light unit, then structural strength and durability are improved, but the module thickness increases and the slim design is compromised
Solution Approach 1:
The patent removes the traditional top case and bottom case structures from the display module, extracting only the essential coupling function. The mould frame is designed to provide structural support and durability without the additional thickness of separate case components, achieving a slim profile while maintaining strength.
Solution Approach 2:
The mould frame is designed to perform multiple functions simultaneously: it couples the liquid crystal display panel and back light unit, provides structural strength, prevents light leakage, and ensures proper alignment. This multi-functional design eliminates the need for separate case components that would increase thickness.
2Device complexity
If no light blocking structure is provided at the boundary between optical sheets and light blocking tape, then device complexity is reduced, but light leakage occurs causing brightness inconsistency
Solution Approach 1:
The patent applies a light blocking extension unit specifically at the boundary region between optical sheets and light blocking tape, where light leakage is most likely to occur. This localized light blocking structure addresses the brightness uniformity issue only where needed, without adding complex structures throughout the entire device.
3Ease of manufacture
If LED packages are not fixed during assembly, then ease of manufacture is improved, but reliability deteriorates due to potential damage and misalignment
Solution Approach 1:
The mould frame includes LED fixing units that are pre-formed as part of the frame structure. During assembly, LED packages are simply placed into these pre-formed fixing units, which automatically hold them in the correct position and protect them from damage. This preliminary preparation of fixing structures simplifies assembly while ensuring reliability.
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 prevents light leakage, maintains uniform brightness across the screen, and improves the module's durability by ensuring proper alignment and fixing of LED arrays, thus enhancing the overall performance and reliability of the liquid crystal display module.
Implementation Method 1
a light guide plate and a LED array which are disposed in the inner side of the mould frame. The liquid crystal display panel is attached at the mould frame by a black light blocking tape
Implementation Method 2
an extension unit which is extended from the upper surface of the body to reflect the light from the LED array
Data Source
AI summary
A mold frame of a liquid crystal display module can include a body for coupling a liquid crystal display panel and a back light unit including a light emitting device (LED) array having a plurality of LED packages thereon; an extension unit extended from an upper surface of the body to cover a light source of the back light unit; and an inclined surface disposed at the extension unit for reflecting light from the light source to control an amount of the light supplied to the liquid crystal display panel.