Adaptive Scan Pulse Control for Display Luminance Consistency
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Solution Overview
Problem
Organic light emitting display devices face issues with hysteresis characteristics in driving transistors, leading to inconsistent luminance due to changes in gate voltage, resulting in suboptimal image generation in current frames.
Innovation Solution
A display device and method that adjust the number of scan pulses based on image variations between frames, using a pulse controller to determine the necessary scan pulses through grayscale value calculations and threshold comparisons, and apply grayscale compensation values to ensure consistent luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of scan pulses is increased to minimize hysteresis characteristics, then luminance consistency is improved, but power consumption and driving complexity increase
Solution Approach 1:
The patent applies dynamics by making the number of scan pulses variable rather than fixed. The pulse controller dynamically adjusts the number of scan pulses based on image characteristics (still image vs. moving image) and hysteresis compensation needs, optimizing the balance between luminance consistency and power consumption in different operating conditions
Solution Approach 2:
The patent changes the parameter of scan pulse count based on image type and hysteresis characteristics. For still images, more scan pulses are applied to minimize hysteresis and improve luminance consistency, while for moving images, the number of scan pulses is reduced to lower power consumption, accepting some hysteresis effect
2Reliability
If multiple scan pulses are supplied to minimize hysteresis, then image quality is improved, but the driving time and frame rate are reduced
Solution Approach 1:
The system dynamically adjusts the number of scan pulses based on image characteristics. For still images where quality is paramount, multiple scan pulses are used to minimize hysteresis. For moving images where time is critical, fewer scan pulses are applied to maintain higher frame rates while accepting some quality trade-off
Solution Approach 2:
The patent changes the scan pulse count parameter according to image type (still vs. moving) and hysteresis compensation requirements, optimizing the trade-off between image quality and driving time by adapting the parameter to different operating conditions
3Ease of operation
If a fixed number of scan pulses is used, then driving simplicity is maintained, but luminance inconsistency and ghost phenomena occur in still images
Solution Approach 1:
The patent transitions from a fixed scan pulse scheme to a dynamic adaptive scheme. The pulse controller automatically determines the appropriate number of scan pulses based on image characteristics, maintaining simplicity in operation while improving luminance consistency through intelligent adaptation to different image types
Solution Approach 2:
The system uses feedback from image characteristic analysis to adjust the number of scan pulses. By analyzing whether the image is still or moving and calculating hysteresis effects, the pulse controller provides appropriate feedback control to optimize scan pulse count, eliminating ghost phenomena while maintaining driving simplicity
Data Source
AI summary
A display device includes: a display panel including a plurality of pixels each coupled to a scan line and a data line; a scan driver for supplying a scan signal having at least one scan pulse to the scan line; and a pulse controller for adjusting a number of the scan pulses supplied during one frame, based on an image variation between a previous frame and a current frame.