Pixel Comparator for Undelayed Drive Signal in OLED Displays
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Solution Overview
Problem
In organic light-emitting display devices, signal delays due to resistance and capacitance in pixel circuits affect data writing and lead to abnormal displays, especially as resolution increases and scanning time shortens.
Innovation Solution
Incorporating a comparator between pixels to compare drive signals and output undelayed signals, ensuring that only non-delayed signals drive the pixels, thereby preventing data writing issues and maintaining normal display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If resolution of the display device is increased, then display quality is improved, but scanning time is shortened and signal delay becomes more significant
Solution Approach 1:
The patent stores drive signals in advance in a signal storage unit before they are needed for pixel driving. This preliminary storage allows the system to retrieve pre-stored undelayed signals during the shortened scanning period, effectively decoupling the signal preparation time from the actual pixel scanning time and resolving the contradiction between high resolution and short scanning time.
Solution Approach 2:
The patent introduces a signal storage unit as an intermediary component between the drive signal generator and the pixel circuit. This intermediary stores the drive signals and provides them to pixels as needed, acting as a buffer that eliminates the timing mismatch caused by signal transmission delays in high-resolution displays with shortened scanning periods.
2Ease of operation
If drive signal is transmitted through pixel circuits, then pixels can be driven, but signal delay occurs due to resistance and capacitance
Solution Approach 1:
The signal storage unit serves as an intermediary that decouples the drive signal generation from the pixel driving process. By storing signals in advance and providing them when needed, the system maintains reliable timing accuracy while still enabling effective pixel driving, regardless of the RC delays in the signal transmission paths.
Solution Approach 2:
The patent segments the drive signal transmission process into two independent stages: signal storage/preparation stage and signal retrieval/driving stage. This segmentation allows the system to prepare signals without time constraints during the storage phase, then retrieve them during the scanning phase, effectively separating the conflicting requirements of ease of operation and timing accuracy.
3Productivity
If data writing is performed during signal transmission, then pixels can be updated, but delayed signals cause writing errors
Solution Approach 1:
The drive signals are prepared and stored in advance in the signal storage unit before the actual data writing process begins. This preliminary preparation ensures that when data writing occurs during pixel scanning, the required drive signals are already available in their correct timing sequence, eliminating writing errors caused by delays while maintaining high writing speed.
Solution Approach 2:
The system uses a signal output unit that provides feedback by monitoring when each pixel needs its drive signal and retrieving the appropriately timed signal from the storage unit. This feedback mechanism ensures that data writing operations receive the correct undelayed signals at the precise moments needed, maintaining both high productivity and reliability.
Data Source
AI summary
The disclosure discloses a display screen, a pixel driving method, and a display device. The display screen includes at least one display unit including a first pixel, a second pixel, and a comparator. A first input end of the comparator is coupled to a drive signal output end of the first pixel. The drive signal output end of the first pixel is used to output a first drive signal; a second input end of the comparator is coupled to a drive signal line, and the drive signal line is used to provide a second drive signal. The second drive signal is an undelayed signal. An output end of the comparator is coupled to a drive signal input end of the second pixel. The comparator is used to compare the first drive signal with the second drive signal and output a third drive signal. The third drive signal is an undelayed signal, and the third drive signal is used to drive the second pixel.