Initialization Transistor Resistance for Display Anode Stability
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Solution Overview
Problem
Existing light emitting display devices face challenges in initializing the anode of a light emitting element and an auxiliary capacitor while compensating for voltage variations in power voltage lines, often requiring a large number of signals and fixed voltages without adequate voltage compensation.
Innovation Solution
A light emitting display device is designed with a matrix of pixels, each comprising a light emitting diode, a light emission transistor, a driving transistor, and an initialization transistor with higher resistance, connected to an initialization voltage line with fixed voltage, allowing for stable initialization and voltage variation compensation using a low number of signals and fixed voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If known techniques are used for initialization and voltage compensation, then initialization of anode and auxiliary capacitor can be achieved, but a large number of signals and fixed voltages are required
Solution Approach 1:
The initialization transistor connects three nodes (gate of driving transistor, one of source/drain of driving transistor, and anode) to the initialization voltage line simultaneously, merging multiple initialization functions into a single transistor operation, thereby reducing the number of signals and fixed voltages required
Solution Approach 2:
The initialization transistor serves multiple functions: initializing the anode of the light emitting element, initializing the auxiliary capacitor, and compensating for voltage variations in the power voltage line, all through a single component that operates with a fixed initialization voltage
2Reliability
If known techniques are used for voltage compensation, then some voltage compensation can be achieved, but sufficient voltage compensation for both low power and high power voltage lines is not provided
Solution Approach 1:
The initialization transistor has a resistance greater than the driving transistor, which enables it to effectively compensate for voltage variations in both low power and high power voltage lines by controlling the charge distribution across different nodes with different voltage requirements
Data Source
AI summary
A light emitting display device, includes: a plurality of pixels arranged in a matrix form, each of the plurality of pixels including: a light emitting element in which a light emitting diode is between an anode and a cathode; a light emission transistor, one of a source or a drain of the light emission transistor is connected to the anode; a driving transistor, one of a source or a drain of the driving transistor is connected to the other of the source or the drain of the light emission transistor; and an initialization transistor which is configured to connect a gate of the driving transistor, the one of the source or the drain of the driving transistor, and the anode, the anode being connected to an initialization voltage line of a fixed voltage at a same time, wherein initialization transistor has a resistance greater than the driving transistor.