Field Sequential Display Driver Power Switching

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Solution Overview

Problem

Conventional field sequential displays consume excessive power due to a single power supply designed for high voltage and high current, which is unnecessary in monochrome mode, leading to increased power consumption.

Innovation Solution

A driver with two power devices, one generating high voltage and high current for color mode and another generating low voltage and low current for monochrome mode, along with a driving waveform generator to adjust scan and display signals accordingly, reducing power consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If a single power supply with high voltage and high current is used to meet color mode requirements, then display quality in color mode is maintained, but power consumption increases unnecessarily in monochrome mode

Engineering Contradiction:

Improvedisplay qualityVSAvoidpower consumption

Core Design Contradiction:

Illumination intensityVSUse of energy by moving object

Solution Approach 1:

The power supply system dynamically switches between two power devices based on display mode. A first power device provides high voltage and high current for color mode, while a second power device provides lower voltage and current for monochrome mode. The controller selects which power device to use according to the current display mode, optimizing power consumption while maintaining display quality.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes power supply parameters (voltage and current levels) based on display mode. In color mode, high voltage and high current are supplied to drive LEDs and maintain fast pulse rising/falling rates. In monochrome mode, lower voltage and current are sufficient since the frame period is not divided and display quality requirements are lower. This parameter adaptation resolves the contradiction between maintaining display quality and reducing power consumption.

Inventive Principle:

Principle #35Parameter changes

2Duration of action of moving object

If high current is used to reduce pulse rising and falling time in color mode, then effective driving time is maintained, but power consumption increases

Engineering Contradiction:

Improveeffective driving timeVSAvoidpower consumption

Core Design Contradiction:

Duration of action of moving objectVSUse of energy by moving object

Solution Approach 1:

The system dynamically adjusts current levels based on display mode. In color mode, high current is used to achieve fast pulse rising and falling rates, ensuring sufficient effective driving time despite the divided frame period. In monochrome mode, lower current is sufficient since the full frame period is available for driving, thus reducing power consumption while maintaining adequate driving time.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The current parameter of the power supply is changed according to display mode. High current is supplied in color mode to maintain short pulse widths and fast switching rates. In monochrome mode, the current is reduced to lower power consumption levels since the driving time requirements are less stringent with the undivided frame period.

Inventive Principle:

Principle #35Parameter changes

3Illumination intensity

If high voltage is supplied to improve display quality in field sequential display, then display performance is enhanced, but power consumption increases unnecessarily in monochrome mode

Engineering Contradiction:

Improvedisplay qualityVSAvoidpower consumption

Core Design Contradiction:

Illumination intensityVSUse of energy by stationary object

Solution Approach 1:

The voltage output of the power supply is dynamically adjusted based on display mode. In color mode, high voltage is supplied to enable proper operation of the display panel with fast switching requirements. In monochrome mode, lower voltage is sufficient since the display quality requirements are reduced and the full frame period is available, thereby reducing power consumption.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The voltage parameter is changed according to display mode requirements. High voltage is used in color mode to maintain display quality with divided frame periods. In monochrome mode, the voltage is reduced to appropriate lower levels since the undivided frame period provides sufficient driving time, optimizing power consumption while maintaining adequate display performance.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS8643683B2Driver of field sequential display capable of switching current and voltage of scan signal and display signal and driving method thereof

Publication Date: 2014.02.04 NUVOTON

AI summary

A driver of a field sequential display is provided. The driver includes a first power device, a second power device, and a driving waveform generator. The first power device generates a first power when the field sequential display is in a color mode. The second power device generates a second power when the field sequential display is in a monochrome mode. The voltage and current of the second power are respectively smaller than the voltage and the current of the first power. The driving waveform generator coupled to the first power device and the second power device and generates a plurality of scan signals and a plurality of display signals according to the first power or the second power, so as to drive a display panel of the field sequential display.