Display Pixel Initialization Power Offset for Luminance Uniformity
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Solution Overview
Problem
In display devices, the variability in load on initialization power lines results in inconsistent voltages supplied to pixels, affecting display quality.
Innovation Solution
A display device that applies an offset voltage to maintain consistent initialization power supply voltage by adjusting the voltage supplied to the power line during periods of reduced load, using an initialization power supply that provides a second voltage as a sum of the first voltage and an offset voltage when load decreases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the initialization power supply supplies a constant voltage to the initialization power line, then the circuit design is simple, but the voltage supplied to pixels becomes inconsistent when load varies, degrading display quality
Solution Approach 1:
The initialization power supply dynamically adjusts its output voltage based on the real-time load condition. When the load decreases (detected by voltage increase on the power line), the power supply increases the voltage to maintain constant pixel initialization voltage. This dynamic adjustment resolves the contradiction between simple circuit design and voltage consistency.
Solution Approach 2:
The system implements a feedback mechanism where the voltage on the initialization power line is continuously monitored. When the monitored voltage exceeds a threshold (indicating reduced load), the power supply receives a feedback signal and adjusts its output accordingly. This feedback loop ensures consistent voltage supply to pixels despite load variations.
2Manufacturing precision
If the initialization power supply adjusts voltage to maintain consistency during load changes, then display quality improves, but the power supply control complexity increases
Solution Approach 1:
The voltage adjustment is applied locally and selectively only during the offset period when load reduction is detected. The power supply maintains different voltage levels for different time periods - using a higher voltage during the offset period and standard voltage during other periods. This localized approach achieves voltage consistency without requiring complex continuous adjustment mechanisms.
Solution Approach 2:
The power supply operates in periodic cycles, applying the offset voltage during specific offset periods within each frame period. The controller enables the power supply to switch between different voltage modes periodically based on the scan signal timing and load detection, achieving voltage consistency through periodic rather than continuous adjustment.
3Manufacturing precision
If an offset voltage is applied during periods of reduced load, then voltage consistency to pixels is maintained, but energy consumption increases
Solution Approach 1:
The system applies an excessive voltage (offset voltage) only partially during specific offset periods when load reduction is detected, rather than continuously. The controller limits the high-voltage operation to brief intervals synchronized with the scan signal timing, achieving voltage consistency while minimizing the duration and magnitude of energy excess consumption.
Data Source
AI summary
A display device according to embodiments of the present disclosure includes a pixel including a light-emitting element, and an initialization transistor configured to control an amount of current flowing from a first power line to a second power line via the light-emitting element, and configured to receive a voltage of an initialization power supply from a third power line, and an initialization power supply configured to supply a first voltage as the voltage, and configured to supply a second voltage as the voltage, which is larger than the first voltage, to the third power line during an offset period when a load connected to the third power line is reduced during one frame period.