Alternating Data Driver Defect Detection in Display Panels
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Solution Overview
Problem
Existing display devices face challenges in detecting defects in data drivers, particularly due to the difficulty in distinguishing between functioning and faulty data drivers when both provide signals through the same data lines, making it hard to identify defects accurately.
Innovation Solution
A display device and method that utilize a defect detector to alternately display defect detecting images and reference images on separate display areas, using enable signals to differentiate between the two, allowing for the independent detection of defects in first and second data drivers by contrasting the images displayed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If both data drivers provide signals through the same data lines simultaneously, then the display device can operate with dual driving capability, but it becomes difficult to distinguish between functioning and faulty data drivers
Solution Approach 1:
The defect detector alternately controls the first and second data drivers to operate in a periodic manner. During the first period, the first data driver operates while the second is inactive; during the second period, the second data driver operates while the first is inactive. This periodic alternating operation allows each data driver to be tested independently without signal interference, resolving the contradiction between maintaining dual driving capability and enabling defect detection.
Solution Approach 2:
The defect detection function extracts and separates the testing of each data driver from the simultaneous operation. By using enable signals to selectively activate only one data driver at a time during detection periods, the system isolates each driver's signal path, allowing independent defect detection while preserving the dual driving capability during normal operation modes.
2Measurement precision
If defect detecting images and reference images are displayed simultaneously on the same display area, then comparison can be made, but it becomes impossible to identify which data driver is being tested
Solution Approach 1:
The display area is segmented into different regions for displaying defect detecting images and reference images simultaneously. The defect detector controls to display these images in separate display areas, allowing visual comparison while maintaining clear identification of which data driver is being tested through spatial separation. This segmentation enables both accurate defect detection and driver identification without information loss.
Data Source
AI summary
A display device includes a display panel divided into a first display area and a second display area in a first direction, a first data driver which provides a first data signal to the first display area through data lines arranged in a second direction crossing the first direction, a second data driver which provides a second data signal to the second display area through the data lines arranged in the second direction, a gate driver which provides a gate signal to the display panel through gate lines arranged in the first direction, a timing controller which generates control signals that control the first data driver, the second data driver, and the gate driver, and a defect detector which controls to display a defect detecting image and a reference image on the first display area and the second display area alternately based on an enable signal.