OLED Display Low Power Driving via Charge Pump and MSB Gamma Correction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional low power modes for OLED displays result in abnormal visual effects due to the lack of an optimized driving method, which is not applicable to self-emitting OLEDs, and are inefficient in terms of power consumption.
Innovation Solution
An OLED display and low power driving method that involves a DC-DC converter disabled in low power mode, using a panel driver to supply a second high potential power voltage, and gamma correction for only MSBs, with specific circuitry and switching mechanisms to minimize power consumption and prevent abnormal visual effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a conventional low power mode is applied to OLED displays, then power consumption is reduced, but abnormal visual effects occur
Solution Approach 1:
The patent applies parameter changes by switching the high potential power voltage supply method between normal mode (using DC-DC converter) and low power mode (using panel driver charge pump). It also changes the gamma correction processing parameter from full bits to MSBs only in low power mode, thereby achieving both power reduction and acceptable visual quality
Solution Approach 2:
The patent implements dynamic switching between different power supply configurations based on operating mode. The panel driver dynamically activates or deactivates the DC-DC converter and switches between different voltage generation paths (DC-DC converter output vs. charge pump output), allowing adaptive power management that maintains visual quality while reducing consumption
2Use of energy by moving object
If the DC-DC converter is disabled in low power mode, then power consumption is minimized, but a different voltage supply mechanism must be used
Solution Approach 1:
The panel driver is designed with multi-functionality, serving both as a display control device and as a power voltage generation device. The charge pump circuit within the panel driver can generate the high potential power voltage needed for OLED operation, eliminating the need for a separate DC-DC converter in low power mode and reducing overall system complexity
Solution Approach 2:
The patent merges the power voltage generation function into the panel driver by incorporating a charge pump circuit. This combines the display control functionality with power supply functionality in a single integrated component, allowing the DC-DC converter to be disabled while maintaining necessary voltage supply through the charge pump
3Illumination intensity
If gamma correction is applied to all bits, then image quality is maintained, but power consumption increases
Solution Approach 1:
The patent applies partial action by performing gamma correction only on the Most Significant Bits (MSBs) of the video data in low power mode, rather than processing all bits. This partial processing approach maintains acceptable image quality while significantly reducing the computational power required for gamma correction operations
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 solution effectively prevents abnormal visual effects in low power mode while minimizing power consumption by adjusting voltage and gamma correction, ensuring efficient operation and maintaining image quality.
Implementation Method 1
The panel driver comprises a charge pump that adjusts an input voltage to output the second high potential power voltage
Implementation Method 2
OLEDs have a number of advantages, for example, such as rapid response speed, and high light emission efficiency, brightness, and view angle
Data Source
AI summary
An organic light emitting diode (OLED) display and a low power driving method of the OLED display are provided. The OLED display comprises a display panel that comprises data lines, scan lines intersecting the data lines, and light emitting cells arranged in a matrix form, wherein the light emitting cells respectively comprise OLEDs, a DC-DC converter that is enabled in a normal mode to supply a first high potential power voltage to the display panel and is disabled in a low power mode, and a panel driver that drives the data lines and the scan lines of the display panel, disables the DC-DC converter in the low power mode, and supplies a second high potential power voltage to the display panel.