Display Driving Transistor Through Current Suppression
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Solution Overview
Problem
In display devices with a driving circuit comprising three transistors, a significant amount of unnecessary power is consumed during the light extinction period due to through current flowing from the driving transistor via the switching transistor, as both transistors remain in a conduction state, leading to unutilized power consumption.
Innovation Solution
The timing of the light extinction period is defined by writing a voltage causing the driving transistor to enter a non-conduction state to its gate electrode, rather than the switching transistor's conduction state, thereby preventing through current flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the switching transistor enters a conduction state to apply a fixed potential to the source electrode of the driving transistor, then the light emitting unit enters a light extinction period, but a lot of through current flows from the driving transistor via the switching transistor causing unutilized power consumption
Solution Approach 1:
The patent applies preliminary action by having the writing transistor write a voltage to the gate electrode of the driving transistor before the light extinction period begins. This voltage causes the driving transistor to enter a non-conduction state in advance, preventing through current from flowing during the subsequent light extinction period when the switching transistor is in conduction state. This timing adjustment eliminates the harmful effect of unutilized power consumption while maintaining the necessary light extinction function.
2Reliability
If the driving transistor and switching transistor are in conduction state together during the light extinction period, then the light emitting unit can be properly extinguished, but through current flows causing unutilized power consumption
Solution Approach 1:
The writing transistor writes a voltage to the gate electrode of the driving transistor before the light extinction period starts. This preliminary voltage writing causes the driving transistor to enter a non-conduction state in advance, ensuring that when the switching transistor enters conduction state to apply the fixed potential, the driving transistor is already in the non-conduction state, thereby preventing through current flow while maintaining proper light extinction functionality.
Solution Approach 2:
The patent changes the voltage parameter at the gate electrode of the driving transistor by having the writing transistor write a specific voltage before the light extinction period. This parameter change causes the driving transistor to transition from a conduction state to a non-conduction state, fundamentally altering its electrical characteristics to prevent harmful through current flow during the light extinction period.
Data Source
AI summary
A display device includes a pixel array unit in which pixels are arranged, each pixel including a light emitting unit, a writing transistor that writes a video signal, a driving transistor that drives the light emitting unit based on the video signal written by the writing transistor, and a switching transistor that applies a fixed potential to one terminal of the light emitting unit, and a driving unit that causes the light emitting unit to enter a light extinction state by writing a voltage causing the driving transistor to enter a non-conduction state to a gate electrode of the driving transistor.