OLED Scan Driving With Split Voltage Management to Reduce Crosstalk
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing OLED display systems face challenges in efficiently managing multiple voltage levels and power supply requirements, leading to inefficiencies and potential crosstalk issues.
Innovation Solution
The system incorporates a power management application circuit (PMAC) with a PMIC and an additional external circuit to generate and manage both positive and negative driving voltages based on a battery voltage, along with a driving circuit that generates scan signals using negative voltages, optimizing power distribution and reducing crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single PMIC is used to manage all voltage levels, then device complexity is reduced, but power efficiency and crosstalk control deteriorate
Solution Approach 1:
The power management circuit is segmented into a first PMIC and a second PMIC, where the first PMIC manages first power supply voltages (ELVDD, ELVSS) and the second PMIC manages second power supply voltages (VGH, VGL). This segmentation allows each PMIC to be optimized for specific voltage ranges, improving power efficiency and reducing crosstalk between different voltage domains while maintaining manageable complexity through functional division.
2Manufacturing precision
If positive and negative driving voltages are generated separately, then voltage control precision is improved, but device complexity increases
Solution Approach 1:
The voltage generation circuits for positive and negative driving voltages are merged into a single integrated voltage generator block. This generator simultaneously produces VGH (positive driving voltage) and VGL (negative driving voltage) from the power supply voltages managed by the two PMICs. The merging approach maintains precise voltage control by keeping the generation logic unified while reducing overall device complexity compared to having separate generation circuits for each voltage type.
Data Source
AI summary
An OLED display system includes a display panel, a driving circuit, a voltage generator and a power management application circuit (PMAC). The driving circuit provides scan signals to the display panel. The voltage generator generates a negative voltage based on a first driving voltage having a positive level and a second driving voltage having a negative level and provides the negative voltage to the driving circuit. The PMAC includes a power management application circuit (PMIC) and an additional circuit distinct from the PMIC and disposed externally to the PMIC. The PMIC applies a high power supply voltage and a low power supply voltage to the display panel and generates the first driving voltage based on a battery voltage. The additional circuit generates the second driving Voltage based on the battery voltage. The driving circuit generates at least one of the scan signals based on the negative voltage.