Column Driver IC Low-Power Mode Voltage Generation
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Solution Overview
Problem
Column driver ICs for displays face challenges in reducing power consumption, particularly due to static current in source amplifiers, especially in low-power modes, which affects the efficiency of OLED displays as their power consumption varies with screen brightness.
Innovation Solution
The implementation of a column driver IC with a master gray scale voltage generation circuit that divides reference voltages to generate tap voltages, enabling the creation of low-power mode gray scale voltages, which are used by low-power mode amplifiers to drive pixel lines, thereby reducing static current and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If source amplifiers are used to drive pixel lines in low-power mode, then the display can operate in low-power mode, but static current flows in the source amplifiers causing increased power consumption
Solution Approach 1:
The patent changes the voltage parameter by generating a boosted voltage (higher than reference voltage) specifically for low-power mode operation. This voltage parameter change allows the display to operate in low-power mode while compensating for the static current consumption through enhanced voltage-driven efficiency
Solution Approach 2:
The patent segments the power management system by creating separate voltage generation paths: a reference voltage generation circuit for normal mode and a boosted voltage generation circuit for low-power mode. This segmentation allows optimized power consumption characteristics for each operating mode without compromising the other
2Reliability
If reference voltage is used to drive pixel lines, then normal display operation is maintained, but power consumption is higher compared to low-power mode
Solution Approach 1:
The patent implements dynamic voltage selection where the display system automatically switches between reference voltage (for normal operation) and boosted voltage (for low-power mode) based on operational requirements. This dynamic adaptation allows the system to optimize power consumption while maintaining reliable display operation across different modes
3Illumination intensity
If OLED display brightness is increased, then better visual performance is achieved, but power consumption increases
Solution Approach 1:
The patent utilizes voltage parameter changes to optimize power consumption at different brightness levels. By providing a boosted voltage for low-power mode operation, the system can achieve better power efficiency while maintaining the required brightness levels through enhanced voltage-driven current control in the OLED pixels
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
This solution effectively decreases power consumption in low-power modes by enabling efficient voltage management, optimizing power usage in OLED displays and reducing static current in source amplifiers.
Implementation Method 1
a master gray scale voltage generation circuit configured to divide a reference voltage to generate tap voltages
Data Source
AI summary
A column driver integrated circuit (IC) which drives a first group of pixel lines connected to a first group of pixels included in a display panel, and a second group of pixel lines connected to a second group of pixels included in the display panel, the column driver IC including: a master gray scale voltage generation circuit configured to divide a reference voltage to generate tap voltages, and to generate a first low-power mode gray scale voltage based on at least one of the tap voltages; and a first low-power mode amplifier configured to drive the first group of pixel lines based on the first low-power mode gray scale voltage.