Scan Driver Signal Control for Display Power Reduction
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Solution Overview
Problem
Display devices experience increased power consumption due to the continuous supply of scan signals and data signals to both display and non-display areas, leading to unnecessary energy usage.
Innovation Solution
A display device with a scan driver that generates sequential driving signals based on synchronization signals, light emitting clock signals, and initialization signals to differentiate between display and non-display areas, applying on-voltage or off-voltage levels to scan signals accordingly, and a data driver that transfers valid or invalid data based on area selection signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If scan signals and data signals are continuously supplied to all scan lines and data lines in the display unit, then the display device can maintain readiness for display operations, but power consumption increases compared to the power needed to drive the display area only
Solution Approach 1:
The display unit is divided into a display area and a non-display area, with scan lines segmented into first scan lines (for display area) and second scan lines (for non-display area). The scan driver is similarly segmented to generate different scan signals for different areas, allowing selective power supply to reduce overall power consumption while maintaining display readiness.
Solution Approach 2:
Different voltage levels are applied to different regions: on-voltage level is applied to first scan lines corresponding to the display area to enable active display operations, while off-voltage level is applied to second scan lines corresponding to the non-display area to minimize power consumption. This local differentiation allows the system to maintain reliability where needed while reducing energy usage elsewhere.
2Use of energy by moving object
If the display unit is divided into display area and non-display area with selective power supply, then power consumption is reduced, but the complexity of signal control increases
Solution Approach 1:
The scan driver dynamically adjusts its operation based on the area selection signal, switching between generating scan signals for the display area only, or for both display and non-display areas. This dynamic adaptability allows the system to reduce power consumption during normal operation while maintaining the capability to activate the non-display area when needed, without requiring permanent complex circuitry.
Solution Approach 2:
An area selection signal acts as an intermediary control signal that determines the operational state of the scan driver. This single control signal simplifies the overall system architecture by providing a unified mechanism to switch between different power consumption modes, avoiding the need for complex independent control circuits for each scan line.
Data Source
AI summary
A display device that can reduce power and simplify a manufacturing process includes a display unit and a scan driver. The display unit includes a plurality of scan lines, a plurality of data lines, and a plurality of pixels. The scan lines are configured to receive a plurality of scan signals. The scan driver is configured to receive a synchronization signal that is generated in synchronization with a vertical synchronization signal, a first light emitting clock signal, a second light emitting clock signal representing the first light emitting clock signal shifted by a half cycle, a first initialization signal having a first phase delay relative to the second light emitting clock signal, and a second initialization signal having a second phase delay relative to the first light emitting clock signal. The scan driver is configured to generate a plurality of sequential driving signals and the plurality of scan signals.