Display Driving Method Duty Cycle Segmentation
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Solution Overview
Problem
Existing display technologies face inefficiencies and increased power consumption due to the need for high duty cycles in global emission control signals, particularly when displaying backgrounds at low grayscale levels with foreground elements at high grayscale levels, leading to suboptimal operation of light emitting elements.
Innovation Solution
A driving method that divides input images into blocks, maps grayscale values to duty cycles, and adjusts data voltages to achieve a desired duty cycle for pixel groups, allowing individual pixel circuits to operate at better efficiency points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a high duty cycle is used for global emission control signal to display high grayscale level elements, then high grayscale level elements can be displayed properly, but light emitting elements displaying background operate at low efficiency points causing increased power consumption
Solution Approach 1:
The patent divides the display into multiple pixel groups (e.g., first pixel group and second pixel group) that can be controlled with different duty cycles. This segmentation allows background pixels to use low duty cycles for efficiency while foreground pixels use high duty cycles for proper brightness, resolving the contradiction between illumination intensity and power consumption.
Solution Approach 2:
Different pixel groups are assigned different duty cycles based on their specific display requirements. Background pixel groups receive low duty cycles to operate at efficient points, while foreground pixel groups receive high duty cycles to maintain proper illumination intensity. This local differentiation eliminates the need to use high duty cycles globally, reducing overall power consumption.
2Use of energy by moving object
If a low duty cycle is used to reduce power consumption, then power consumption decreases, but high grayscale level elements cannot be displayed properly
Solution Approach 1:
By segmenting pixels into different groups, the system can apply low duty cycles to background pixels (reducing power consumption) while simultaneously applying high duty cycles to foreground pixels (maintaining illumination intensity). This resolves the contradiction by showing that a single low duty cycle cannot serve all pixels.
Solution Approach 2:
The patent implements local quality control where each pixel group receives a duty cycle tailored to its function. Background regions use low duty cycles for energy efficiency, while foreground regions use high duty cycles for proper brightness. This localized approach proves that low duty cycle alone cannot achieve both low power consumption and proper high grayscale display.
3Productivity
If global emission control signal uses fixed high duty ratio, then all pixel circuits can operate, but light emitting elements cannot operate at optimal efficiency points
Solution Approach 1:
The patent transitions from a fixed high duty ratio to dynamic duty cycle adjustment. The system calculates optimal duty cycles for different pixel groups based on their grayscale levels and operates them accordingly. This dynamic approach allows background pixels to operate at high efficiency points with low duty cycles while foreground pixels operate with high duty cycles, maximizing overall productivity and minimizing power consumption.
Solution Approach 2:
The patent changes the duty cycle parameter from a fixed high value to variable values tailored to each pixel group. By mapping grayscale levels to specific duty cycle values and adjusting data voltages accordingly, the system enables light emitting elements to operate at their optimal efficiency points across the entire display, resolving the contradiction between productivity and energy use.
Data Source
AI summary
A driving method includes the following steps. An input image is divided into a plurality of image blocks. A plurality of pixel groups corresponding to the image blocks are respectively controlled. Step of controlling a corresponding one of the pixel groups corresponding to one of the image blocks includes the following steps. A plurality of input grayscale values included in one of the image blocks are mapped to a plurality of duty cycles. One of the duty cycles is determined as a desired duty cycle. A plurality of the input grayscale values are mapped to a plurality of data voltages according to the desired duty cycle. A plurality of pixel circuits included in the one of the pixel groups are driven according to the desired duty cycle and the data voltages.