OLED Display Driving Control for Distance-Based Flicker Reduction
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Solution Overview
Problem
Display devices experience image quality defects such as flicker when the driving frequency changes, particularly due to variations in driving voltage during transitions between high-speed and low-speed modes.
Innovation Solution
A display device and driving method that control the driving frequency and voltage levels based on the distance to the user and non-use time, utilizing a mode control circuit, compensation control circuit, data driving circuit, and power management circuit to minimize flicker and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the driving frequency is changed to adapt to different user scenarios, then power consumption is reduced and display adaptability is improved, but image quality defects such as flicker occur due to driving voltage variations
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the driving voltage level according to the driving frequency. When switching between high-speed and low-speed driving modes, the power management circuit modifies the voltage parameter to compensate for the image quality degradation caused by frequency changes, thereby maintaining display reliability while improving adaptability
Solution Approach 2:
The patent implements feedback control where the mode control circuit determines the user state (distance and non-use time), the compensation control circuit calculates the required compensation based on the frequency change, and the power management circuit adjusts the driving voltage accordingly. This closed-loop feedback mechanism ensures that image quality is maintained while adapting to different display scenarios
2Reliability
If the driving voltage is increased to maintain image quality during frequency transitions, then image quality is preserved, but power consumption increases
Solution Approach 1:
The patent dynamically changes the voltage parameter based on the driving frequency and user state. Instead of maintaining a constant high voltage, the system adjusts the voltage level to the minimum required for the current driving mode, thereby preserving image quality while minimizing power consumption in different operating conditions
3Use of energy by stationary object
If the driving frequency is reduced to save power during user absence, then power consumption is reduced, but flicker occurs due to insufficient voltage compensation
Solution Approach 1:
The patent applies preliminary action by having the mode control circuit detect user state (distance and non-use time) in advance and predict the need for frequency adjustment. The compensation control circuit pre-calculates the required voltage compensation, and the power management circuit prepares the appropriate driving voltage before the frequency transition, preventing flicker while enabling power savings
Solution Approach 2:
The system dynamically adjusts the driving voltage parameter in response to frequency changes during user absence. When the display switches to low-speed mode to save power, the voltage is compensated to maintain adequate image quality, resolving the contradiction between power consumption and image quality
Data Source
AI summary
A display device may include a display panel including a plurality of subpixels, a mode control circuit configured to control a driving mode by determining a state of a user, a compensation control circuit configured to control compensation for at least one of a driving voltage and a data signal according to the user's state, a data driving circuit configured to supply a compensated data signal to the display panel according to control of the compensation control circuit, and a power management circuit configured to supply a compensated driving voltage to the display panel according to control of the compensation control circuit.