Scan Driver Signal Width Adjustment for Display Luminance Consistency
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Solution Overview
Problem
Existing display devices struggle to maintain similar luminances when driven at high and low image refresh frequencies, leading to potential display quality issues.
Innovation Solution
A display device and method where the scan driver supplies an enable scan signal with varying widths during the blank area of a frame, corresponding to different image refresh rates, to ensure consistent luminance across different driving frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the display device uses a fixed-width enable scan signal during the blank area, then the device complexity is reduced, but the luminance consistency between high and low refresh rates deteriorates
Solution Approach 1:
The enable scan signal width is made dynamic rather than fixed. The scan driver automatically adjusts the width of the enable scan signal based on the current image refresh rate, ensuring that the signal width corresponds to the actual blank area duration. This dynamic adjustment resolves the contradiction by introducing adaptability (improving luminance consistency) without requiring complex manual configuration or additional hardware components.
Solution Approach 2:
The patent changes the parameter of enable scan signal width according to the image refresh rate. By varying this temporal parameter, the system maintains proper synchronization between the scan signal and the display refresh cycle at different frequencies, thereby ensuring luminance consistency. This parameter adjustment approach resolves the contradiction by using a simple variable parameter to achieve both adaptability and luminance stability.
2Illumination intensity
If the enable scan signal width is adjusted for different image refresh rates, then the luminance consistency is improved, but the device complexity increases
Solution Approach 1:
The scan driver performs self-adjustment based on feedback about the image refresh rate. The system automatically detects or receives the refresh rate information and independently determines the appropriate enable scan signal width without external intervention. This self-service mechanism resolves the contradiction by enabling adaptive luminance control through an intelligent but hardware-efficient approach, avoiding the need for complex external control systems.
Solution Approach 2:
The scan driver is designed to handle multiple image refresh rates universally. By incorporating refresh rate detection capability and adaptive width adjustment, a single scan driver circuit can serve multiple operating conditions (high refresh rate mode, low refresh rate mode) without requiring separate dedicated circuits for each mode. This multi-functionality resolves the contradiction by achieving adaptability through enhanced but compact driver design.
3Adaptability or versatility
If the enable scan signal width is made variable, then the adaptability to different refresh rates is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent replaces mechanical or hardware-based precision control mechanisms with electronic/software-based control. Instead of using precise physical timing circuits or hardware counters that would require tight manufacturing tolerances, the system uses digital signal processing and programmable width adjustment in the scan driver. This substitution resolves the contradiction by achieving variable precision through software control rather than hardware precision, thereby maintaining adaptability while reducing manufacturing precision requirements.
Data Source
AI summary
A display device includes at least one pixel configured to receive a voltage of an initialization power source, which is supplied to an anode electrode of a light emitting element, when an enable scan signal is supplied to a scan line, and a scan driver. The scan driver is configured to supply the enable scan signal to the scan line. The enable scan signal supplied to the scan line by the scan driver has a same width during an active area of a frame regardless of an image refresh rate, and the width of the enable scan signal supplied to the scan line is changed by the scan driver during a blank area of the frame, corresponding to the image refresh rate.