Display Device Start Signal Generator for Luminance Uniformity
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Solution Overview
Problem
Recent display devices experience a luminance difference between the write period and the maintenance period within a frame, which can deteriorate display quality.
Innovation Solution
A display device and method that utilize a start signal generator to produce first and second start signals with different widths for the write and maintenance periods, respectively, to minimize luminance differences. The signals are controlled by a selector and emission driver to adjust the emission control signals for the pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single emission control signal width is used for both write period and maintenance period, then the device complexity is reduced, but luminance uniformity deteriorates due to luminance difference between periods
Solution Approach 1:
The emission control signal is segmented into two distinct types: a first emission control signal for the write period and a second emission control signal for the maintenance period. Each signal type has a specifically designed width tailored to its functional requirements, allowing independent optimization of luminance characteristics for each period without compromising overall device complexity.
Solution Approach 2:
Different signal widths are applied locally to different time periods within the frame. The first emission control signal has a width optimized for the write period, while the second emission control signal has a width optimized for the maintenance period. This local differentiation ensures that each period receives the appropriate signal characteristics needed to maintain uniform luminance throughout the frame.
2Stability of the object's composition
If different width start signals are supplied for write period and maintenance period, then luminance difference between periods is reduced, but device complexity increases
Solution Approach 1:
The system dynamically selects between different start signal widths based on the operational phase. A selector component switches between generating a first start signal with a first width for the write period and a second start signal with a second width for the maintenance period. This dynamic adaptation allows the system to optimize luminance characteristics for each phase while managing complexity through structured signal generation.
Solution Approach 2:
The signal width parameter is changed according to the operational period. The start signal generator produces different width signals (first width for write period, second width for maintenance period) based on phase requirements. This parameter variation enables precise control over emission duration and luminance characteristics without requiring fundamental changes to the device architecture.
3Duration of action of moving object
If emission control signal width is increased, then light emission duration is extended, but energy consumption increases
Solution Approach 1:
The system applies partial action by using different emission control signal widths for different periods. The first emission control signal uses a width that provides sufficient emission duration for the write period, while the second emission control signal uses a different width optimized for the maintenance period. This prevents excessive emission duration (and associated energy consumption) in periods where it is not needed, while still achieving the required luminance uniformity.
Data Source
AI summary
A display device includes pixels connected to scan lines, data lines, and emission control lines, a start signal generator configured to generate a first start signal corresponding to a first emission control signal supplied in a write period of a frame period, in which a data signal is supplied, and a second start signal corresponding to a second emission control signal supplied in a maintenance period of the frame period, in which the data signal is maintained, and having a width that is different from a width of the first start signal, a selector configured to supply the first start signal or the second start signal based on a control signal from a controller, and an emission driver configured to supply the first emission control signal or the second emission control signal to the emission control lines based on the first start signal or the second start signal.