Display Device Pixel Circuit Transistor Repair Mechanism
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Solution Overview
Problem
Existing display devices lack a reliable method for repairing transistors, which are crucial for maintaining the performance and longevity of the display.
Innovation Solution
The display device incorporates a pixel circuit with an auxiliary transistor that can replace a defective main transistor, allowing for the repair of transistors by disconnecting the defective main transistor and connecting the auxiliary transistor to the pixel circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a main transistor is defective in a pixel circuit, then the display device cannot be repaired and must be discarded, but this leads to loss of the entire display device even though only one transistor is defective
Solution Approach 1:
The pixel circuit is segmented into a main transistor that can be disconnected and an auxiliary transistor that can be activated. The disconnection unit separates the defective main transistor from the circuit, allowing the auxiliary transistor to take over its function and maintain pixel operation.
Solution Approach 2:
An auxiliary transistor is pre-configured in the pixel circuit alongside the main transistor. This preliminary setup ensures that when the main transistor fails, the auxiliary transistor is already in position and can be activated through the disconnection unit to restore functionality without requiring external repair interventions.
2Ease of repair
If the main transistor is disconnected and auxiliary transistor is connected, then transistor repair is enabled, but the pixel circuit requires additional components and control mechanisms
Solution Approach 1:
The auxiliary transistor is designed with the same functionality as the main transistor, allowing it to universally replace the main transistor's role in the pixel circuit. The disconnection unit provides multi-functionality by既能 disconnecting the main transistor when defective又能connecting the auxiliary transistor to maintain circuit operation.
Solution Approach 2:
The disconnection unit acts as an intermediary between the main transistor and auxiliary transistor. It mediates the transition from main transistor operation to auxiliary transistor operation by selectively disconnecting and connecting appropriate components based on the functional status of the transistors.
3Reliability
If an auxiliary transistor is added to the pixel circuit, then repair capability is improved, but the area occupied by the pixel circuit increases
Solution Approach 1:
The auxiliary transistor is nested within the existing pixel circuit structure, utilizing available space efficiently. The disconnection unit and associated control components are integrated into the circuit layout, allowing the auxiliary transistor to be accommodated without significantly increasing the overall pixel area.
Data Source
AI summary
The present disclosure relates to a display device, and more particularly to a display device capable of repairing a transistor. According to an embodiment of the disclosure, a display device comprising: a pixel comprising a light emitting element and a pixel circuit; and a signal line connected to the pixel, wherein the pixel circuit comprises: a first main transistor connected between a driving voltage line and an anode electrode of the light emitting element; a second main transistor connected between a data line and a gate electrode of the first main transistor; a third main transistor connected between the driving voltage line and a source electrode of the first main transistor; a fourth main transistor connected between a drain electrode of the first main transistor and a common voltage line; and one auxiliary transistor disposed adjacent to at least one of the first to fourth main transistors.