Display Panel Test Switch Control to Prevent Leakage Defects
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Solution Overview
Problem
Existing display devices face issues with test switching elements on the display panel remaining in a turn-on state after commercialization, leading to voltage and current leakage, which can cause image display defects and reduce product reliability.
Innovation Solution
A display device design that includes a display driving circuit controlling the supply timings of data and gate signals to maintain test switching elements in a stable turn-off state during image display periods, using various control signals and voltage levels to ensure they remain off.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If test switching elements are formed on the display panel for testing purposes, then test functionality is improved, but current and voltage leakage occurs during image display periods
Solution Approach 1:
The patent applies preliminary action by configuring the test switching elements with specific electrical connections before the display panel is commercialized. The first electrodes are connected to data lines and the second electrodes are connected to line terminals that can be controlled to maintain a floating state or receive off control signals, ensuring the test switching elements are pre-configured to remain in a turn-off state during normal operation, thus preventing current and voltage leakage before commercialization occurs.
2Ease of operation
If test switching elements remain in turn-on state after commercialization, then ease of operation is improved, but image display defects and reliability issues occur
Solution Approach 1:
The patent applies segmentation by separating the control mechanisms for test switching elements from the normal display switching elements. The test switching elements have dedicated first electrodes connected to data lines, second electrodes connected to controllable line terminals, and gate electrodes with specific gate-on and gate-off signals. This segmentation allows independent control of test functions while ensuring they remain isolated during normal display operation, preventing interference and reliability issues.
3Adaptability or versatility
If test switching elements are electrically connected to data lines and gate lines, then test capability is improved, but voltage and current leakage paths are created
Solution Approach 1:
The patent applies the intermediary principle by introducing controllable line terminals as intermediaries between the test switching elements and the data/gate lines. These line terminals can be controlled to either connect to the data lines for testing purposes or maintain a floating state during normal operation. This intermediary mechanism allows the test switching elements to be electrically connected to necessary lines for testing while preventing direct leakage paths during commercialized operation, as the intermediary can isolate the test elements when not in use.
Data Source
AI summary
A display device comprises a plurality of pixels arranged in a display area of a display panel, a test switching element area formed in a non-display area or a sub-area of the display panel and including a plurality of test switching elements, and a display driving circuit controlling supply timings of data voltages and driving control signals supplied to the plurality of pixels, wherein the display driving circuit controls turn-off switching operations of the plurality of test switching elements so that the plurality of test switching elements are maintained in a turn-off state during an image display period.