OLED Power Driving System Single Chip Voltage Generation
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Solution Overview
Problem
Conventional OLED panels require two power chips for power driving, leading to increased power consumption due to quiescent current and additional power consumption from the boost circuit, which is inefficient.
Innovation Solution
A power driving system with a single power chip that generates input, positive supply, and negative supply voltages, where the input voltage is bucked down to reduce power consumption, eliminating the need for a boost circuit and allowing the data driver to operate within a lower voltage range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional OLED panel uses two power chips for power driving, then the OLED panel can provide necessary power supplies for normal operation, but power consumption increases due to quiescent current and additional power consumption from the boost circuit
Solution Approach 1:
The patent merges the functions of two separate power chips (analog power IC and OLED power IC) into a single integrated power chip. This single power chip provides all necessary power supplies including Vin, OVDD, OVSS, and the boosted voltages (2×Vin, 3×Vin), eliminating the need for multiple chips and reducing total power consumption while maintaining reliable operation.
2Ease of operation
If a boost circuit is used to increase input voltage Vin to generate data high voltage Data_high and data low voltage Data_low, then the source driver can operate with required voltage levels, but additional power consumption occurs at 2×Vin or 3×Vin level
Solution Approach 1:
The patent integrates the boost circuit functionality directly into the single power chip, combining voltage generation and boosting operations in one device. This eliminates the need for a separate boost circuit in the data driver, reducing power consumption while maintaining voltage level compatibility for the source driver operation.
3Adaptability or versatility
If two power chips are used in the power driving system, then all necessary voltages can be generated, but device complexity increases
Solution Approach 1:
The patent combines multiple power chip functions into a single integrated device that generates all necessary voltages (Vin, OVDD, OVSS, and boosted voltages). This reduces device complexity by eliminating one power chip while maintaining full voltage generation capability through integrated circuit design.
Solution Approach 2:
The single power chip performs multiple functions simultaneously: it generates the input voltage Vin, the positive supply voltage OVDD, the negative supply voltage OVSS, and provides boosted voltages (2×Vin, 3×Vin) for the source driver. This multi-functional design reduces the number of components while maintaining versatility.
Data Source
AI summary
An OLED panel includes a data driver and an AMOLED. The data driver receives an input voltage and the data driver may generate a data output signal. The AMOLED may receive a positive supply voltage and a negative supply voltage and emit light according to the data output signal. In addition, the input voltage and the positive supply voltage are substantially the same.