OLED Driving Method Non-Sequential Scan Signal Supply
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Solution Overview
Problem
Organic light emitting display devices face challenges in minimizing power consumption, particularly as the number of lines to be driven increases and driving frequency rises, leading to noticeable power consumption issues.
Innovation Solution
A digital driving method is implemented where scan signals are non-sequentially supplied to scan lines during unit times, with data signals for subframes of varying lengths being synchronized to reduce power consumption by optimizing the correlation of data signals applied to the same data line, and the method includes setting the number of selection times to equal the number of subframes times the number of scan lines, with options for adjacent or spaced scan lines to balance power consumption and gray level expression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If scan signals are supplied sequentially to all scan lines for each subframe, then complete frame display is achieved, but power consumption increases due to frequent charging and discharging of data lines
Solution Approach 1:
The frame period is segmented into multiple subframe periods with different lengths, and scan signals are selectively supplied to specific scan lines during specific subframes. This segmentation allows the display to skip unnecessary data line charging operations while still completing the full frame display through cumulative subframe coverage.
Solution Approach 2:
The patent employs periodic scan signal supply patterns where scan signals are activated during specific subframe periods and deactivated during others. By creating periodic on/off patterns for different scan lines across multiple subframes, the system reduces the frequency of data line charging operations while maintaining complete frame refresh.
2Measurement precision
If the number of subframes and selection times is increased to improve gray level expression, then gray level precision improves, but power consumption and driving complexity increase
Solution Approach 1:
Different scan lines are assigned different subframe patterns tailored to their specific gray level requirements. Lines requiring higher precision receive more subframe selections, while lines with lower requirements use fewer selections. This local optimization achieves necessary gray level precision without uniformly increasing power consumption across the entire display.
Solution Approach 2:
The patent varies the lengths of subframe periods and the number of selection times as adjustable parameters to optimize the balance between gray level expression and power consumption. By changing these temporal parameters dynamically across different subframes and scan lines, the system achieves precise gray level control without excessive power usage.
3Loss of energy
If scan lines are spaced apart to reduce power consumption, then charging frequency decreases, but gray level expression uniformity may be affected
Solution Approach 1:
The patent employs asymmetric spacing patterns where scan lines are grouped in sets with different spacing intervals. Within each group, lines are spaced to optimize power savings, while the asymmetric arrangement of multiple groups ensures that all scan lines receive appropriate selection opportunities across the frame period, maintaining gray level uniformity despite varied spacing.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces power consumption by minimizing frequent charging and discharging of data lines while maintaining effective gray level expression, making it suitable for both general use and power-sensitive applications like portable devices.
Implementation Method 1
the organic light emitting display devices display images using organic light emitting diodes (OLEDs) that emit light through recombination of electrons and holes
Data Source
AI summary
An organic light emitting display and a driving method of the organic light emitting display capable of reducing or minimizing power consumption. The driving method includes setting a number of selection times constituting one frame, and setting a number of unit times constituting the one frame. Each of the unit times includes j (j is a natural number of 2 or more) of the selection times. Scan signals are non-sequentially supplied to scan lines during each of the unit times. The one frame includes a number of subframes. Data signals for ones of the subframes having a same length are supplied corresponding to i (i is a natural number of 2 or more) consecutive ones of the scan signals.