Display Emission Timing for Stable Luminance Across Frame Rates
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Solution Overview
Problem
Existing display devices struggle to minimize luminance differences when driven at high and low frame frequencies, leading to flickering issues.
Innovation Solution
A display device with a timing controller that adjusts emission control signals of varying widths and positions based on luminance levels, using a first emission control signal during a writing period and additional signals during active and blank areas of a frame to maintain consistent luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single emission control signal width is used during the active area, then the device complexity is low, but luminance consistency across different frame frequencies deteriorates
Solution Approach 1:
The active area is divided into multiple sub-periods (writing period, first period, second period, third period) with different emission control signal widths. This segmentation allows each sub-period to have optimized emission control for its specific function, resolving the contradiction between simple control structure and luminance consistency.
Solution Approach 2:
The emission control signal width is made dynamic rather than fixed, varying according to the frame frequency and the specific period within the active area. This dynamic adjustment enables the system to maintain luminance consistency across different operating conditions while managing complexity through structured variability.
2Stability of the object's composition
If emission control signal width is increased to maintain luminance at low frame frequencies, then luminance consistency improves, but energy consumption increases
Solution Approach 1:
Different emission control signal widths are applied to different sub-periods within the active area based on their specific requirements. The writing period uses a narrower width sufficient for data writing, while other periods use wider widths only when necessary for luminance maintenance, optimizing energy usage locally rather than uniformly across the entire active area.
Solution Approach 2:
The emission control signal width parameter is dynamically changed based on the frame frequency and the specific period within the active area. This parameter adjustment allows the system to maintain luminance consistency at low frame frequencies without continuously using maximum signal width, thereby reducing overall energy consumption.
3Stability of the object's composition
If multiple emission control signals with different widths are supplied during the active area, then luminance consistency across frame frequencies improves, but device complexity increases
Solution Approach 1:
The active area is segmented into distinct periods (writing period, first period, second period, third period), each with specifically designed emission control signals. This segmentation provides a structured framework for using multiple signal widths without creating unnecessary complexity, as each segment's signal characteristics are optimized for its specific function.
Solution Approach 2:
The emission control signals are organized as periodic actions within the active area, with each period having a defined pattern of signal widths. This periodic structure makes the complexity manageable and predictable, allowing the system to use multiple signal widths systematically rather than arbitrarily.
Data Source
AI summary
A display device includes: pixels each connected to a corresponding scan signal among scan lines, a corresponding data line among data lines, and a corresponding emission control line among emission control lines; and an emission driver which supplies an emission control signal to the emission control lines. The emission control signal includes a first emission control signal having a first width and a second emission control signal having a second width during an active area of one frame.