Backlight Module Shielding Structure for LCD Light Leakage
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Solution Overview
Problem
In LCD devices with edge-light bottom-light backlight modules, light leakage occurs due to gaps between the light guide panel and the middle frame, leading to bright lines and local hotspots on the LCD panel, compromising device quality.
Innovation Solution
A shielding structure comprising a groove in the middle frame and a convex lug on the light guide panel, where the convex lug is integrated with the panel and designed to match the groove, preventing direct light emission from the gap, with a triangular or rectangular cross-section and length sufficient to fully shield the light source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gap is reserved between the light guide panel and middle frame due to manufacturing tolerance and thermal expansion, then the light guide panel can accommodate thermal expansion and manufacturing variations, but light leakage occurs causing bright lines and local hotspots on the LCD panel
Solution Approach 1:
The invention divides the light shielding function into multiple segments: the groove structure in the middle frame and the convex lug structure on the light guide panel. These segmented structures work together to block light leakage while accommodating the gap caused by thermal expansion and manufacturing tolerances.
Solution Approach 2:
The convex lug acts as an intermediary element between the light guide panel and the groove in the middle frame. It fills the gap space and blocks the light path, preventing direct light leakage while allowing the gap to exist for thermal and manufacturing reasons.
2Length of stationary object
If the frame width is reduced to achieve narrow frame design, then the aesthetic and design goals are met, but the gap between components becomes more critical and light leakage problems worsen
Solution Approach 1:
The invention addresses the light leakage problem by adding vertical dimension elements (convex lug extending upward from the light guide panel) rather than simply widening the horizontal frame structure. This allows narrow frame design while effectively blocking light leakage through the vertical shielding structures.
3Reliability
If an independent convex lug component is assembled to the light guide panel, then the shielding effectiveness is improved, but the device complexity and assembly steps increase
Solution Approach 1:
The shielding structure is segmented into the groove (part of middle frame) and the convex lug (separate component assembled to light guide panel). This segmentation allows the convex lug to be pre-formed and then assembled, improving shielding effectiveness while keeping the added complexity manageable through modular design.
Data Source
AI summary
The invention relates to the field of LCDs, and more particularly to a backlight module and an LCD device comprising the backlight module. The backlight module includes a middle frame, a light guide panel, and a light source; the backlight module further includes a shielding structure which is used for preventing the light of the light source from being directly emitted from the gap between the middle frame and the light guide panel; the shielding structure includes a groove arranged in the middle frame, and a convex lug arranged on the light guide panel; the convex lug is arranged in the groove. Because of the existence of the shielding structure, the light cannot be directly emitted onto the optical film from the gap between the middle frame and the light guide panel; thus, the problem of light leakage is solved; therefore, the bright line and facula cannot be generated on the LCD panel, thereby improving the quality of the LCD device.