Photo Sensor Defect Detection in Display Devices
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Solution Overview
Problem
Current methods for inspecting photo sensor elements and lines in liquid crystal display modules are inefficient due to the need for an inspection facility to monitor current differences and the difficulty in aligning small input terminals with inspection terminals, especially in miniaturized displays where space is limited.
Innovation Solution
A display device with a substrate that includes photo sensor elements and lines, where a switching element is used to apply a predetermined inspection voltage, allowing for defect detection based on the turn-on state of the display panel, eliminating the need for current monitoring and simplifying terminal alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a current monitoring system is used to inspect photo sensor elements and lines, then defect detection capability is improved, but device complexity increases due to requiring additional inspection facilities
Solution Approach 1:
The display device inspects itself by utilizing its own display function. When a pixel corresponding to a photo sensor element turns on in response to an inspection signal, the defect is detected through the display output rather than requiring external current monitoring equipment. This self-inspection mechanism eliminates the need for separate inspection facilities.
Solution Approach 2:
The display panel serves dual purposes: it functions as both the display device and the inspection device. The same pixels that display images are also used to indicate defect conditions during inspection, thereby eliminating the need for dedicated inspection equipment and reducing overall system complexity.
2Area of moving object
If small input terminals are used in miniaturized displays, then display size is reduced, but alignment difficulty increases between terminals and inspection points
Solution Approach 1:
The system uses the display's own pixels to indicate inspection status. Instead of requiring precise alignment between external inspection terminals and small input terminals, the inspection result is visually displayed through pixel activation, making the inspection process independent of terminal alignment precision.
Solution Approach 2:
The pixel acts as an intermediary between the photo sensor element and the inspection system. Rather than directly connecting inspection equipment to small input terminals, the pixel translates the inspection signal into a visible display output, eliminating the need for precise terminal alignment.
3Area of moving object
If the peripheral region is narrowed to increase display area, then display area is improved, but space for inspection terminals is reduced
Solution Approach 1:
The display panel performs both display and inspection functions using the same pixels. This eliminates the need for separate inspection terminals in the peripheral region, allowing the peripheral area to be minimized while still maintaining inspection capability.
Solution Approach 2:
The inspection function is extracted from the peripheral region and integrated into the display region itself. By using pixels within the display area to indicate inspection status, the need for peripheral inspection terminals is eliminated, freeing up peripheral space.
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
Enables effective inspection of photo sensor elements and lines without requiring additional inspection facilities, improving alignment and reducing complexity in miniaturized display devices.
Implementation Method 1
a liquid crystal display module which includes a photo sensor element in the inside of a liquid crystal display panel
Data Source
AI summary
The present invention inspects a defect of a photo sensor element or a photo sensor line. A display device includes a substrate, a plurality of pixels formed on a display region of the substrate, and a plurality of video lines for applying a video voltage to the plurality of pixels. The substrate includes at least one photo sensor element which is formed on a region outside the display region, a photo sensor line which is connected with at least one photo sensor element, and at least one first switching element which connects at least one photo sensor element and at least one video line out of the plurality of video lines. At the time of inspecting the photo sensor element, the first switching element is turned on and, at the same time, a predetermined inspection voltage is applied to at least one photo sensor element via the photo sensor line thus applying a signal to the pixel via the first switching element and the video line, and in response to a turn-on state of the pixel at the time of applying the signal to the pixel, a defect of at least one of at least one photo sensor element and the photo sensor line can be detected.