Light Emitting Display Transistor Control for Anode Reset Stability
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Solution Overview
Problem
In light emitting display apparatuses, transistors may abnormally turn on during the anode reset period, leading to defects such as horizontal line issues in the display panel, particularly when the transistor intended to be turned off during this period is not properly controlled.
Innovation Solution
A light emitting display apparatus design where the switching transistor connected to the data line and anode of the light emitting device is turned on at least once during the anode reset period, with the gate driver controlling the first light emitting transistor multiple times per second and the switching transistor fewer times per second, ensuring proper operation during both refresh and anode reset periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If data voltages are supplied to data lines only during refresh period to improve power consumption, then power consumption is reduced, but transistors may abnormally turn on during anode reset period causing display defects
Solution Approach 1:
The patent implements periodic action by turning on the first light emitting transistor multiple times per second (M times, where M≥3) and the switching transistor multiple times per second (S times, where 1<S<M) during the anode reset period. This periodic activation prevents abnormal transistor states while maintaining reduced power consumption compared to continuous operation, resolving the contradiction between power savings and operational reliability
Solution Approach 2:
The patent applies preliminary action by activating the switching transistor at least once during the anode reset period before the next refresh period begins. This preliminary activation ensures the transistor is properly reset and prevents abnormal turn-on conditions, maintaining reliability while still limiting operation to specific periods rather than continuously
2Ease of operation
If the switching transistor is turned off during anode reset period to maintain proper control, then transistor control is maintained, but horizontal line defects may occur in the display panel
Solution Approach 1:
The patent resolves this contradiction by implementing periodic action where the switching transistor is turned on S times per second (where 1<S<M) during the anode reset period. This periodic activation prevents horizontal line defects by ensuring the transistor is properly reset, while still maintaining controlled operation and not requiring continuous activation, thus preserving ease of operation
Solution Approach 2:
The patent applies partial action by activating the switching transistor at least once during the anode reset period rather than continuously. This partial activation is sufficient to prevent horizontal line defects and ensure proper transistor control, while avoiding the excessive power consumption and control complexity of continuous activation
Data Source
AI summary
A light emitting display apparatus includes a pixel having a pixel driving circuit and a light emitting device, and a gate driver supplying gate signals to the pixel driving circuit. The pixel driving circuit includes a switching transistor and a first light emitting transistor. The first light emitting transistor is connected between an anode of the light emitting device and a first node, and the switching transistor is connected between a data line in the light emitting display panel and the first node. During use, the gate driver turns on the first light emitting transistor M times per second (M is a natural number of 3 or more) and turns on the switching transistor S times smaller than M times and more than one time (S is a natural number of 2 or more) per second. One second is divided into a refresh period and an anode reset period.