OLED Brightness Control via PWM-DC Mode Switching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional OLED displays experience issues with uneven brightness and color bias due to the switching method between pulse-width modulation (PWM) and direct current (DC) light adjusting, resulting in a worse display effect when the display brightness value is below a certain threshold.
Innovation Solution
A brightness adjusting method that determines the target brightness adjusting mode based on display brightness value intervals, switching from PWM to DC light adjusting mode in the interval below the threshold to improve linearity and mitigate color bias, using a control unit and storage unit to implement the method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If PWM light adjusting mode is used for low brightness values, then power consumption is reduced, but display linearity deteriorates and color bias occurs
Solution Approach 1:
The patent implements dynamic switching between PWM and DC light adjusting modes based on the current brightness value. When brightness exceeds a threshold, DC mode is used for linear control; when below threshold, PWM mode is used for power saving. This dynamic adaptation resolves the contradiction by selecting the appropriate mode based on operational conditions.
Solution Approach 2:
The patent changes the light adjusting mode parameter based on brightness value thresholds. By monitoring the brightness value and switching between PWM and DC modes, the system optimizes both power consumption and display linearity according to the current operating point.
2Manufacturing precision
If switching threshold is set low, then DC mode usage increases improving linearity, but power consumption increases
Solution Approach 1:
The patent optimizes the switching threshold parameter to balance linearity and power consumption. By carefully selecting the threshold value, the system ensures DC mode is used only when necessary for linearity, while PWM mode handles most low-brightness scenarios for power saving.
Solution Approach 2:
The patent applies different light adjusting modes to different brightness ranges. DC mode is applied locally to the high-brightness region where linearity is critical, while PWM mode is applied to the low-brightness region where power saving is prioritized.
3Use of energy by moving object
If switching threshold is set high, then power consumption is reduced, but display linearity deteriorates
Solution Approach 1:
The patent fine-tunes the switching threshold parameter to prevent excessive PWM usage. By setting the threshold appropriately, the system ensures DC mode is activated early enough to maintain linearity while still maximizing power savings through PWM at lower brightness levels.
Data Source
AI summary
The present application relates to a brightness adjusting method, a device, a display device, and a storage medium. The method includes obtaining display brightness value lines, wherein each of the display brightness values of the display brightness value lines in a first display brightness value interval corresponds to a direct current (DC) mode; determining a target brightness adjusting mode according to a display brightness value interval in the display brightness value lines corresponding to an obtained target display brightness value; and adjusting brightness of a display device according to the target brightness adjusting mode to mitigate issues of a worse display effect and color bias.