Triangle-Wave Pixel Driving for High-Contrast Display Control
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Solution Overview
Problem
Display devices with liquid crystal elements and single light sources face challenges in displaying black without turning off the backlight, achieving high contrast, and reducing power consumption, especially in head-mounted displays where weight and power efficiency are critical.
Innovation Solution
A method for driving a display device that includes multiple pixels connected by wirings, where a triangle wave signal is used to control the luminance of light-emitting elements, allowing for independent timing of light emission and black insertion to improve contrast and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single light source with color filters is used in a liquid crystal display device, then the device structure is simple, but the contrast ratio deteriorates and black display capability is lost
Solution Approach 1:
The display device is divided into multiple independent light-emitting elements (red, green, blue) within each pixel, allowing each element to be controlled separately. This segmentation enables the display of black by turning off all light-emitting elements while maintaining a simple overall device structure without requiring complex color filter systems.
Solution Approach 2:
The patent employs time-sequential control where light-emitting elements are turned on and off in specific sequences to display different colors and intensities. By periodically controlling the emission of each light-emitting element, the system achieves high contrast ratios and accurate black display while maintaining structural simplicity.
2Area of moving object
If field-sequential method with multiple hues is used to increase information display, then the pixel size can be reduced, but power consumption increases
Solution Approach 1:
The patent uses periodic control of light-emitting elements where each element is activated only when needed to display its specific color. This time-sequential activation reduces overall power consumption compared to continuous operation, while maintaining the ability to display full-color information in reduced pixel areas.
Solution Approach 2:
Each light-emitting element is optimized for its specific color function with dedicated control circuits. This local optimization allows efficient energy usage by activating only the specific light-emitting elements required for each pixel's color display, rather than illuminating all elements continuously.
3Use of energy by moving object
If head-mounted display with large battery is used to compensate for high power consumption, then power supply is sufficient, but weight increases and user burden increases
Solution Approach 1:
The display device uses periodic activation of light-emitting elements instead of continuous operation, significantly reducing average power consumption. This allows the use of smaller batteries in head-mounted displays, thereby reducing weight and user burden while maintaining adequate power supply for the display function.
Solution Approach 2:
The display device incorporates efficient power management at the element level, where each light-emitting element is controlled to operate only when needed. This self-service approach optimizes energy usage throughout the device, enabling reduced battery capacity and weight in portable head-mounted applications.
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
The method enhances display contrast and reduces power consumption by allowing precise control of light emission and black insertion, effectively addressing the challenges of weight and power efficiency in portable displays.
Implementation Method 1
a light-emitting element 35, a first transistor 31, and a second transistor 32... the light-emitting element is turned on by being supplied with a triangle wave... the light-emitting element emits light
Data Source
AI summary
A novel display device where a light-emitting element is turned on by a triangle wave is provided. One embodiment of the present invention is a method for driving a display device including a first pixel, a second pixel, a first wiring, a second wiring, and a third wiring. The first wiring is electrically connected to the first pixel and the second pixel. The second wiring and the third wiring are electrically connected to the first pixel and the second pixel, respectively. At a first time, the first pixel reaches the maximum luminance corresponding to first display data and the second pixel reaches the maximum luminance corresponding to second display data. The first pixel and the second pixel are initialized at a second time different from the first time by input of a reset signal to the first wiring to stop light emission.