Display Pixel Circuit Using Separate Gate-Low Scan Voltages
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Solution Overview
Problem
Existing display devices face challenges in reducing power consumption, particularly in portable devices where efficient management of scan signals and transistors is crucial.
Innovation Solution
The display device employs a pixel unit with specific voltage settings for scan signals and transistors, including P-type and N-type transistors, and utilizes a power source generator to produce multiple gate voltages for efficient scan signal generation, reducing power consumption by optimizing transistor operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a single gate voltage is used for all scan signals, then device complexity is reduced, but power consumption increases
Solution Approach 1:
The patent divides the gate voltage control into multiple segments by providing different gate low voltages (first gate low voltage and second gate low voltage) for different scan signals (write scan signal and initialization scan signal respectively). This segmentation allows optimized power consumption for each transistor type without requiring a completely complex unified control system.
Solution Approach 2:
The patent applies local quality by setting specific voltage levels tailored to each transistor's requirements: the first gate low voltage is optimized for P-type write transistors while the second gate low voltage is optimized for N-type initialization transistors. This localized optimization reduces overall power consumption without requiring global system redesign.
2Use of energy by moving object
If different gate voltages are used for different scan signals, then power consumption is reduced, but device complexity increases
Solution Approach 1:
The power source generator is designed with multi-functionality to provide multiple gate voltages (gate high voltage, first gate low voltage, second gate low voltage) from a single device. This universal approach reduces the need for separate voltage generation circuits for each transistor type, thereby limiting the increase in device complexity while achieving power consumption reduction.
3Productivity
If higher gate low voltage is used, then transistor switching efficiency is improved, but power consumption increases
Solution Approach 1:
The patent applies parameter changes by setting different optimal voltage levels for different transistor types: the first gate low voltage is set higher than the second gate low voltage to match the switching characteristics of P-type transistors, while the second gate low voltage is optimized for N-type transistors. This parameter optimization improves switching efficiency for each transistor type while minimizing overall power consumption.
Data Source
AI summary
A display device includes a pixel unit including pixels. Each pixel includes a light emitting element, a driving transistor controlling an amount of current flowing from a first power source line to a second power source line via the light emitting element in response to a voltage of a node, a write transistor connected between a first electrode of the driving transistor and a data line and turned on or off in response to a write scan signal, and an initialization transistor connected between an anode electrode of the light emitting element and an initialization power source line and turned on or off in response to an initialization scan signal. A low voltage of the write scan signal is set to a first gate low voltage, and a low voltage of the initialization scan signal is set to a second gate low voltage different from the first gate low voltage.