OLED Display Power Supply Voltage Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Despite the use of peak luminance control algorithms, organic light-emitting diode displays in electronic devices still face challenges in reducing power consumption and extending the lifetime of display pixels, as they tend to consume excessive current and generate heat when displaying high-average-luminance content.
Innovation Solution
A timing controller in the display driver circuitry analyzes image data frames to determine average luminance, limiting peak luminance and adjusting the power supply voltage accordingly, reducing power consumption and extending the lifespan of display pixels by dynamically varying the power supply voltage based on luminance levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If peak luminance control algorithm is used to limit power consumption, then power consumption is reduced, but the lifetime of display pixels is not sufficiently extended
Solution Approach 1:
The patent applies dynamics by making the power supply voltage adjustable and variable based on the average luminance of displayed content. Instead of using a fixed voltage, the system dynamically changes the voltage level (e.g., first voltage for low average luminance, second voltage for high average luminance) to optimize both power consumption and pixel lifetime under different operating conditions.
Solution Approach 2:
The patent changes the power supply voltage parameter based on the average luminance of the displayed image data. By monitoring the average luminance and adjusting the voltage accordingly, the system achieves better control over power consumption and thermal generation, thereby extending pixel lifetime while maintaining display quality.
2Illumination intensity
If all content is displayed at maximum luminance, then display brightness is maximized, but current draw and power consumption become excessive
Solution Approach 1:
The system changes the power supply voltage parameter based on the average luminance of the displayed content. When average luminance is high, the voltage is reduced to prevent excessive current draw, while still allowing peak luminance to be displayed at appropriate levels. This dynamic parameter adjustment balances brightness requirements with power consumption constraints.
3Loss of energy
If peak luminance control is applied, then power consumption is capped, but temperature rise in display is not sufficiently limited
Solution Approach 1:
The patent changes the power supply voltage based on the average luminance of the displayed content to better control thermal generation. By adjusting the voltage level dynamically, the system reduces the overall power consumption and heat generation in the display, thereby limiting temperature rise while maintaining acceptable display quality.
Data Source
AI summary
A display may receive image data to be displayed for a user of an electronic device. Display driver circuitry in the display may include a timing controller that receives the image data. The timing controller can analyze frames of the image data to determine average luminance values for the frames. The display may include an array of organic light-emitting diode display pixels. Each display pixel may include a light-emitting diode. A transistor in each display pixel may be coupled in series with the light-emitting diode between positive and ground power supply terminals. The timing controller can limit peak luminance in the image data that is displayed on the array of display pixels as a function of average luminance. The timing controller can also direct power regulator circuitry to adjust a power supply voltage applied to the positive power supply terminal based on the average luminance.