LCD Guide Wall Concave Portion for LED Alignment
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Solution Overview
Problem
In liquid crystal display devices with thin profiles, the reduced height of the guide wall in the main frame makes it difficult to accurately position the LED assembly during modularization, leading to light leakage and non-uniform luminance, and the decreased contact area between the light shielding tape and the guide wall results in detachment and increased production costs.
Innovation Solution
Incorporating a concave portion on the guide wall of the main frame and an open portion on the light shielding tape, allowing for visual inspection of alignment errors before final assembly, and using a double-sided adhesive tape for secure attachment, ensuring accurate placement and preventing light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the height of the guide wall is reduced to achieve a thin profile, then the device thickness is decreased, but the positioning accuracy of the LED assembly deteriorates
Solution Approach 1:
The patent introduces a horizontal dimensional feature (concave portion) on the guide wall to compensate for the reduced vertical height. This allows the LED assembly to be positioned accurately through horizontal engagement rather than relying solely on vertical height, resolving the contradiction between thin profile and positioning accuracy.
2Length of stationary object
If the height of the guide wall is reduced to achieve a thin profile, then the device thickness is decreased, but the contact area between the light shielding tape and the guide wall is reduced
Solution Approach 1:
The patent extends the contact area from the vertical surface to the horizontal top surface of the guide wall by introducing a concave portion. This allows the light shielding tape to make contact with both the vertical and horizontal surfaces, compensating for the reduced vertical height and maintaining adequate contact area for secure attachment.
3Ease of repair
If visual inspection capability is added to detect alignment errors, then the ease of repair is improved, but the device complexity increases
Solution Approach 1:
The patent uses contrast in visual appearance (the open portion revealing the concave portion) to enable easy detection of alignment errors. This simple visual indication method allows workers to identify misalignment without complex inspection equipment, improving ease of repair while adding minimal structural complexity.
Data Source
AI summary
A liquid crystal display device includes: a liquid crystal panel; a backlight unit under the liquid crystal panel, the backlight unit including a light emitting diode (LED) assembly supplying a light and a light guide plate transmitting the light from the LED assembly to the liquid crystal panel; a main frame surrounding the backlight unit, the main frame including a flat portion for supporting the LED assembly and a guide wall for guiding the LED assembly, the guide wall including at least one concave portion; and a light shielding tape on the guide wall and the LED assembly, the light shielding tape including at least one open portion corresponding to the at least one concave portion.