Dummy Stage Sensing Q Node Voltage for Gate Pulse Compensation
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Solution Overview
Problem
Long-term use of light emitting display apparatuses can lead to characteristic changes in transistors within the gate driver, resulting in abnormal gate pulses being output, which affect display quality.
Innovation Solution
Incorporating a dummy stage connected to dummy gate lines in a non-display area, a sensing unit, and a controller that senses voltage changes in the dummy stage and supplies compensation signals to maintain stable transistor performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the light emitting display apparatus is used for a long time, then the display apparatus can maintain continuous operation, but the characteristics of transistors constituting the gate driver change, resulting in abnormal gate pulses being output
Solution Approach 1:
The patent applies preliminary action by sensing transistor characteristic changes in the dummy stage before they affect the actual display output. The sensing unit continuously monitors voltage levels at critical nodes (such as the Q node) in the dummy stage, and the controller pre-adjusts gate pulse characteristics based on detected changes, preventing abnormal output before it occurs.
Solution Approach 2:
The patent implements feedback by creating a closed-loop system where the sensing unit detects voltage changes in the dummy stage, transmits this information to the controller, and the controller adjusts the gate pulse characteristics accordingly. This feedback mechanism allows the system to automatically compensate for transistor degradation and maintain reliable operation over extended periods.
2Reliability
If a dummy stage and sensing unit are added to sense voltage changes, then transistor characteristic changes can be detected and compensated, but the device complexity increases
Solution Approach 1:
The patent applies copying by creating a dummy stage that replicates the structure and electrical characteristics of the actual gate driver stages. This dummy stage serves as a test copy that can be monitored without affecting the primary display function. The sensing unit monitors this copy to infer the state of the main system, enabling detection of transistor degradation patterns.
Solution Approach 2:
The patent implements multi-functionality by designing the dummy stage to serve multiple purposes: it acts as both a functional replica for sensing transistor characteristics and as part of the overall gate driver system. The sensing unit itself performs multiple functions by monitoring voltage at different nodes and providing comprehensive degradation detection. This reduces the need for separate dedicated test structures.
Data Source
AI summary
A light emitting display apparatus comprises a gate driver including stages connected with gate lines provided in a display area and a dummy stage connected with dummy gate lines provided in a non-display area, a sensing unit connected with the dummy stage connected with at least two dummy gate lines provided in the non-display area, and a controller connected with the sensing unit, wherein the dummy stage sequentially outputs at least two gate pulses, the sensing unit senses a voltage of a Q node to which a Q node signal for allowing the gate pulses to be output from the dummy stage is supplied, and the controller supplies a compensation signal based on the voltage to the stages.