Display Panel Test-Switch Turn-Off Control for Image Reliability
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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 potential 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, thereby preventing current and voltage leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If test switching elements are formed on the display panel for testing purposes, then test functionality is enabled, but voltage and current leakage occurs after commercialization causing image display defects
Solution Approach 1:
The patent extracts the test switching elements from the active testing circuitry by connecting them to a dedicated test signal line that is disconnected or deactivated during commercial operation. This allows the test elements to be removed from the functional circuit path, preventing them from causing voltage and current leakage while maintaining their testing capability when needed.
Solution Approach 2:
The patent implements preliminary configuration of the test switching elements during manufacturing by establishing their connection to the test signal line and configuring their initial state. This preliminary setup ensures that when the display panel enters commercial operation, the test elements are already in a non-interfering state, preventing harmful effects before they can occur.
2Adaptability or versatility
If test switching elements remain in turn-on state after commercialization, then testing capability is maintained, but image display defects occur due to leakage
Solution Approach 1:
The patent implements dynamic control of the test switching elements through a controllable switching mechanism that can change the state of test elements based on operational mode. During commercial operation, the switching mechanism dynamically transitions test elements to a non-conductive state, while during testing, it dynamically restores their functionality, thus adapting to different operational requirements.
Solution Approach 2:
The patent employs periodic testing cycles where test switching elements are temporarily activated at scheduled intervals during commercial operation to perform quick diagnostic checks, then immediately deactivated. This periodic action maintains testing capability without causing continuous harmful effects, allowing verification of display functionality while preventing leakage-induced defects.
3Object-generated harmful factors
If control signals are supplied to maintain test switching elements in turn-off state, then leakage is prevented, but device complexity increases
Solution Approach 1:
The patent merges the control of test switching elements with the existing display driving circuitry by utilizing available control signal lines and timing mechanisms. Instead of creating entirely separate control circuits, the test element control is integrated into the existing scan signal and data signal timing structures, thereby preventing leakage without proportionally increasing device complexity.
Solution Approach 2:
The test switching elements are designed to automatically transition to a non-conductive state through inherent circuit characteristics when specific voltage levels or signal conditions are present on the test signal line. This self-service mechanism reduces the need for complex external control circuits, as the elements essentially self-regulate their state based on the electrical conditions imposed by the display driving circuit.
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.