OLED Display Frequency Modulation for Faster Gray-Level Response
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Solution Overview
Problem
OLED display devices experience deteriorated response properties and display quality when driven at low frequencies due to hysteresis issues, leading to flicker and motion blur, especially when rapid gray level changes occur.
Innovation Solution
A display device with a timing controlling unit that modulates the frequency of data signals, increasing to high frequency during events and returning to low frequency after a predetermined interval to improve response properties and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the OLED display device is driven with a relatively low frequency to reduce power consumption, then power consumption is reduced, but response property deteriorates due to hysteresis and the time to reach target luminance is delayed
Solution Approach 1:
The patent applies dynamics by making the driving frequency adjustable rather than fixed. The driving unit changes the frequency of the data signal based on the gray level transition requirements - using low frequency during stable periods to save power, and high frequency during transitions to improve response. This dynamic frequency adjustment resolves the contradiction between power consumption and response property.
Solution Approach 2:
The patent changes the frequency parameter of the data signal based on operational conditions. When rapid gray level changes are detected, the frequency is increased to overcome hysteresis effects and achieve faster response. When the display is stable, frequency is reduced to lower power consumption. This parameter change strategy directly addresses the contradiction.
2Use of energy by moving object
If the OLED display device is driven with a relatively low frequency, then power consumption is reduced, but display quality deteriorates due to flicker and motion blur
Solution Approach 1:
The patent dynamically adjusts the driving frequency based on display content characteristics. When motion or rapid gray level changes are detected that would cause flicker or motion blur, the frequency is increased to maintain display quality. During static display periods, frequency is reduced to save power. This dynamic adaptation resolves the contradiction between power consumption and display quality.
Solution Approach 2:
The patent uses feedback from detecting gray level changes and display conditions to control the driving frequency. The driving unit monitors the display state and adjusts frequency accordingly - increasing it when flicker or motion blur risks are detected, and decreasing it when display quality is maintained. This feedback mechanism ensures display quality while optimizing power consumption.
Data Source
AI summary
A display device includes a timing controlling unit generating an image data, a data control signal and a gate control signal; a data driving unit generating a data signal using the image data and the data control signal; a gate driving unit generating a gate signal using the gate control signal; and a display panel displaying an image using the data signal and the gate signal, wherein the timing controlling unit includes a frequency modulating part configured to increase a frequency of the data signal when an event to the display panel occurs and decrease the frequency after a predetermined interval.