ESR Sensing Circuitry for Display Panel Voltage Compensation
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Solution Overview
Problem
Display panel performance varies with temperature and operating conditions due to changes in effective series resistance (ESR) between power circuitry and the display panel, leading to inconsistent current supply and emission issues.
Innovation Solution
Implementing real-time ESR measurement and compensation by adjusting voltage levels (e.g., ELVDD and ELVSS) to maintain uniform display performance across different temperatures and conditions, using sensing configurations and power management integrated circuits (PMICs) to monitor and adjust current and voltage accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If real-time ESR measurement and compensation is implemented, then display uniformity is improved, but device complexity increases
Solution Approach 1:
The patent combines the ESR sensing circuitry with the existing power management integrated circuit (PMIC) that supplies power to the display panel. By merging these functions into a single integrated circuit, the patent achieves real-time ESR measurement and compensation without adding separate discrete sensing components, thereby improving display uniformity while minimizing the increase in device complexity.
Solution Approach 2:
The PMIC is designed to perform multiple functions: it serves as both the power supply circuit for the display panel and the ESR sensing circuit. The same circuit infrastructure is used for both power delivery and resistance measurement, allowing the system to achieve compensation capability without proportionally increasing overall device complexity.
2Measurement precision
If ESR compensation circuitry is added, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The ESR sensing functionality is merged into the existing PMIC structure, utilizing the same power delivery pathways and control logic. This integration allows for precise ESR measurement through the existing circuit infrastructure without requiring separate dedicated sensing components, thereby improving measurement precision while minimizing additional complexity.
Solution Approach 2:
The PMIC uses its own internal circuitry to measure the ESR of the display panel connection. By having the power management circuit perform self-diagnostics on the connection resistance, the system achieves precise ESR measurement without requiring external sensing equipment or additional complex sensing infrastructure.
3Stability of the object's composition
If voltage adjustment is performed to compensate for ESR changes, then display performance consistency is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic voltage adjustment where the PMIC continuously monitors ESR changes and adapts the output voltage in real-time to compensate for resistance variations. This dynamic compensation ensures consistent display performance across different operating conditions while optimizing power delivery efficiency, thereby minimizing unnecessary power consumption compared to static high-voltage operation.
Solution Approach 2:
The system changes the operating voltage parameter dynamically based on measured ESR conditions. By adjusting the voltage to match actual connection conditions, the system maintains optimal power transfer efficiency and display performance consistency, avoiding both under-powering and excessive power consumption that would occur with fixed voltage operation.
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
Ensures more uniform display output by compensating for ESR changes, maintaining target voltage across organic light-emitting diodes (OLEDs) and reducing current drops, thereby enhancing display consistency and efficiency.
Implementation Method 1
Power circuitry 222 measures an effective series resistance (ESR) of the first path 234 using a third path 238
Implementation Method 2
When this current and/or voltage changes, the power circuitry may be driven differently to compensate for the change
Data Source
AI summary
Methods and systems for compensating display panel operations providing a current from power circuitry over a first path between a display panel and the power circuitry are provided. A sensing current may be injected into the first path via a second path between the power circuitry and the first path. An equivalent series resistance (ESR) of the first path may be calculated using a third path and the sensing current. A processor may compensate for electrical fluctuations from the power circuitry to the display panel based at least in part on the measured ESR.