Display Device Shift Register Reset Element for Start-Up Light Control
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Solution Overview
Problem
Display devices face issues with undesired light emission during the start-up of the high-potential and low-potential power supplies, leading to compromised display quality due to complex control requirements and potential increased manufacturing costs.
Innovation Solution
Incorporating a reset element in the shift register, which collectively turns off the output, allowing the light emitting elements to be disconnected from the power supply using a reset signal, thereby preventing undesired light emission by maintaining the signal at a high level during power supply start-up.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex control mechanisms are used to prevent undesired light emission during power supply start-up, then display quality is maintained, but device complexity and manufacturing costs increase
Solution Approach 1:
The patent applies preliminary action by resetting the shift register before power supply start-up. The reset signal is activated during the power-on sequence before the high-potential and low-potential power supplies are fully established, ensuring that the light emitting elements are disconnected from the power supply in advance, thereby preventing undesired light emission during the vulnerable start-up period.
Solution Approach 2:
The patent introduces a reset signal as an intermediary control mechanism. This reset signal acts as a mediator between the power supply system and the light emitting elements, controlling the switching elements to disconnect the light emitting elements from the power supply during start-up, thus preventing undesired light emission without requiring complex control circuitry.
2Reliability
If reset circuits are added to prevent undesired light emission, then display quality improves, but manufacturing costs increase
Solution Approach 1:
The reset signal serves multiple functions: it resets the shift register, disconnects the light emitting elements from the power supply, and prevents undesired light emission during start-up. By making the reset signal multi-functional, the patent avoids adding separate dedicated circuits for each function, thereby reducing manufacturing costs while maintaining display quality.
Solution Approach 2:
The shift register is designed to be self-resetting through the reset signal that is automatically activated during the power-on sequence. This self-service mechanism eliminates the need for external complex control circuits or additional manufacturing steps, reducing manufacturing costs while ensuring reliable prevention of undesired light emission.
Data Source
AI summary
According to one embodiment, a display device includes a pixel circuit provided in each of a plurality of pixels, a plurality of flip-flop circuits provided in a shift register and a reset element provided in each of the flip-flop circuits, and the reset element is an n-channel type transistor, the pixel circuit includes a light emitting element, a light emitting power supply and a switch element, and the light emitting element is disconnected from the light emitting power supply while the light emitting power supply is rising.