Display Device Scan Signal Timing for Luminance Deviation
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Solution Overview
Problem
Current display devices face challenges in minimizing luminance deviation when driven at low frequencies, which affects their power consumption and display quality.
Innovation Solution
A display device configuration that includes multiple scan drivers and an emission driver, with specific timing control by a timing controller, to manage scan signals and emission control signals across different frequencies, ensuring optimal operation during both display-scan and self-scan periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the display device is driven at low frequency to reduce power consumption, then power consumption is reduced, but luminance deviation increases
Solution Approach 1:
The scan period is divided into multiple sub-periods (first period, second period, third period, fourth period) with different scan signal frequencies. During the first and second periods, scan signals are supplied at a first frequency, while during the third and fourth periods, scan signals are supplied at a second frequency. This segmentation allows the display to operate at lower frequency during certain periods, reducing power consumption while maintaining luminance uniformity through strategic higher-frequency operation during other periods.
Solution Approach 2:
The scan signal frequency is dynamically adjusted based on the specific scan period. The timing controller varies the frequency of scan signals supplied to different scan lines (first, second, third, fourth scan lines) at different times within the same frame period. This dynamic frequency adjustment enables the system to optimize between power consumption and luminance deviation minimization by operating at different frequencies in different temporal segments.
2Manufacturing precision
If multiple scan drivers operate at different frequencies, then luminance deviation is minimized, but device complexity increases
Solution Approach 1:
Multiple scan drivers (first scan driver, second scan driver, third scan driver, fourth scan driver) are employed, each responsible for supplying scan signals to specific scan lines at optimally determined frequencies. The emission driver and data driver similarly operate at different frequencies coordinated with the scan drivers. This multi-functional approach, where each driver is specialized for specific timing and frequency control, achieves luminance uniformity while distributing complexity across multiple coordinated components rather than requiring a single complex driver system.
Data Source
AI summary
A display device includes a display panel including a pixel coupled to first to fourth scan lines, an emission control line, and a data line, a scan driver which supplies a first scan signal to the first scan line, a second scan signal to the second scan line, a third scan signal to the third scan line, and a fourth scan signal to the fourth scan line, an emission driver which supplies an emission control signal to the emission control line, a data driver which supplies a data signal to the data line, and a timing controller which controls the scan driver, the emission driver, and the data driver. Each of the second and third scan signals has a gate-on level during a partial period of one frame, and is maintained at a gate-off level during a remaining period of the one frame, other than the partial period.