Display Panel Spare Pixels for Misalignment Compensation
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Solution Overview
Problem
Display apparatuses face misalignment issues between the window and the display panel, leading to tilt defects that affect the viewing area and active area alignment, resulting in reduced reliability and increased manufacturing costs due to discarded units.
Innovation Solution
Incorporating a spare area with selectively activatable spare pixels around the active area to compensate for misalignment by shifting the active area horizontally and vertically, forming a compensated active area within the viewing area, and utilizing a light blocking portion to define the viewing area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the window and display panel are manufactured without alignment compensation, then the manufacturing process is simple, but misalignment occurs causing tilt defects between the viewing area and active area
Solution Approach 1:
The patent applies preliminary action by pre-defining a spare area around the active area during the manufacturing stage, before alignment issues occur. This spare area is prepared in advance to compensate for potential misalignment between the window and display panel, allowing the active area to be shifted within the viewing area without requiring complex real-time adjustment mechanisms.
Solution Approach 2:
The patent utilizes parameter changes by allowing the active area position to be adjusted within the viewing area based on the degree of misalignment. The spare area provides a range of positional parameters that can be modified to compensate for alignment errors, transforming the fixed position problem into a variable position solution.
2Reliability
If misalignment compensation is not implemented, then the device structure remains simple, but tilt defects reduce display reliability and increase manufacturing waste
Solution Approach 1:
The spare area is established in advance during manufacturing, creating a buffer zone that can absorb alignment variations. This preliminary preparation ensures reliability without requiring complex active compensation mechanisms during operation.
Solution Approach 2:
The patent converts the potentially harmful effect of misalignment into a benefit by designing the spare area to accommodate the misalignment. Instead of viewing the gap between window and panel as a defect to be eliminated, it is utilized as a compensation mechanism that enhances reliability.
3Manufacturing precision
If the active area is shifted to compensate for misalignment, then alignment reliability improves, but the area available for display content decreases
Solution Approach 1:
The patent applies local quality by creating a spare area with different functionality from the active area. The spare area is designed specifically for compensation purposes while the active area maintains its full display capabilities. This localized differentiation allows alignment compensation without sacrificing display area quality.
Solution Approach 2:
The patent uses partial action by activating only the necessary portion of the spare area to compensate for the actual degree of misalignment. Instead of permanently reducing the display area, the spare area serves as a reservoir that can be partially utilized based on the specific alignment requirements, minimizing the impact on overall display area.
Data Source
AI summary
A display includes a window, a display panel and a display panel driver. The display panel includes an active area and a spare area around the active area. The active area includes pixels. The spare area includes spare pixels which are selectively activated to compensate for an amount of tilt of the active area.