RGBW LCD White Pixel Luminance Control for Battery Visibility
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Solution Overview
Problem
LCDs in notebook personal computers face reduced visibility when running on battery power due to lowered backlight luminance, which increases power consumption and affects user experience.
Innovation Solution
An information processing apparatus with a display panel comprising an RGBW type LCD, an illumination unit, and a control method that adjusts the luminance of the white pixel and backlight dynamically, allowing for automatic or user-controlled settings in synchronous or asynchronous modes to optimize power usage and visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the backlight luminance is lowered to reduce power consumption during battery operation, then power consumption is reduced, but visibility becomes worse
Solution Approach 1:
The display is divided into color pixels (R, G, B) and white pixels (W), allowing independent control of each type. During battery operation, white pixels are controlled to emit light while color pixels remain off, creating a power-saving mode that maintains visibility through selective pixel activation rather than uniform backlight dimming.
Solution Approach 2:
The system dynamically switches between different display modes based on power source detection. When battery power is detected, the system automatically activates power-saving display mode with controlled white pixel luminance. When AC power is detected, the system switches to normal mode with full color pixel operation, optimizing both visibility and power consumption adaptively.
2Illumination intensity
If the white pixel luminance is increased to improve visibility, then visibility is improved, but power consumption increases
Solution Approach 1:
Different regions of the display (white pixels vs. color pixels) are assigned different functions based on power availability. White pixels serve as the primary light source during battery operation, while color pixels provide full-color display during AC operation. This local functional differentiation allows visibility improvement without proportional power consumption increase.
Solution Approach 2:
The system changes the luminance parameter of white pixels dynamically based on power source detection. During battery operation, white pixel luminance is increased to compensate for the absence of color pixel backlighting. During AC operation, white pixel luminance is reduced or turned off, allowing color pixels to provide full illumination. This parameter adjustment resolves the contradiction between visibility and power consumption.
Data Source
AI summary
According to one embodiment, an information processing apparatus includes a displaying unit including a display panel, a drive circuit for driving a white pixel, an illumination unit, and an inverter supplying a boosted driving power to the illumination unit, a power supply which supplies the inverter the driving power corresponding to a second control signal, a selecting unit which selects one item of setting data from a setting table including a plurality of items of setting data including luminance setting of the white pixel and luminance setting of the illumination unit, a first control signal outputting unit which supplies to the drive circuit the first control signal corresponding to luminance of the white pixel included in the selected item, and a second control signal outputting unit which supplies to the power supply the second control signal corresponding to luminance of the illumination unit included in the selected item.