OLED Display Power Control Using EVDD and ACL Coordination
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional OLED display devices face high power consumption and increased costs due to the need for expensive high-power EVDD power supply circuits, as they only control the level of the high-potential voltage EVDD, leading to increased power consumption when high luminance is required.
Innovation Solution
A display device and driving method that variably control the EVDD level and adjust the automatic current limit (ACL) value inversely proportional to the EVDD level, maintaining a constant target power by using a timing controller to set the ACL value, thereby reducing power consumption and circuit costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the level of high-potential voltage EVDD is increased to achieve high luminance, then the luminance performance is improved, but the power consumption increases and requires expensive high-power power supply circuits
Solution Approach 1:
The patent changes the control parameter from only EVDD voltage level to a combination of EVDD voltage level and ACL (Automatic Current Limit) value. By adjusting both parameters dynamically based on image content (APL and peak luminance), the system achieves high luminance when needed while maintaining lower power consumption for standard content, resolving the contradiction between luminance performance and power consumption.
Solution Approach 2:
The patent implements dynamic control where both EVDD voltage level and ACL value are adjusted in real-time based on the displayed image content. The timing controller continuously monitors APL and peak luminance, then dynamically adjusts the power supply parameters to match the actual display requirements, avoiding unnecessary high power consumption during low-luminance periods.
2Illumination intensity
If the level of high-potential voltage EVDD is increased to achieve high luminance, then the luminance performance is improved, but the cost of power supply circuit increases
Solution Approach 1:
The patent introduces ACL value as an additional control parameter alongside EVDD voltage level. By controlling both parameters dynamically based on actual display needs (APL and peak luminance), the system can achieve high luminance performance when required while using lower power supply circuit ratings for standard content, thereby reducing the cost of the power supply circuit.
3Use of energy by moving object
If dynamic power control is applied to reduce power consumption, then power consumption is reduced, but the control complexity increases
Solution Approach 1:
The patent implements feedback control where the timing controller continuously monitors the displayed image content (APL and peak luminance) and adjusts the EVDD voltage level and ACL value accordingly. This closed-loop control system automatically optimizes power consumption based on actual display requirements without requiring complex manual intervention or additional hardware complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method effectively reduces maximum power consumption and power supply circuit costs by dynamically controlling the EVDD level and ACL value, ensuring consistent power usage without the need for expensive power supply circuits.
Implementation Method 1
An organic light emitting diode display (hereinafter referred to as 'OLED display device') is a self-luminous device that emits light in an organic light-emitting layer by recombination of electrons and holes
Data Source
AI summary
A display device includes a display panel including a plurality of pixels, each of the plurality of pixels having a light-emitting element that emits light based on current that corresponds to a data voltage, and a timing controller configured to set level of a supply voltage of the display panel for displaying input image data, set an automatic current limit (ACL) value of the display panel based on the level of the supply voltage, and adjust a luminance gain of the input image data based on the ACL value to generate the data voltage.