LCD Light Source Duty Cycle Control for White Balance
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Solution Overview
Problem
Conventional liquid crystal displays (LCDs) face challenges in achieving standard white light balance due to equal duty cycles for red, green, and blue light sources, which reduces light efficiency and increases energy consumption, and the use of color filters complicates this process.
Innovation Solution
Implementing a control device to manage light sources of different colors, allowing them to emit light in distinct time frames with varying duty cycles, enabling white balance through persistence of vision without the need for color filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If equal duty cycles are used for red, green, and blue light sources, then the display structure is simple, but white light balance cannot be achieved and light efficiency is reduced
Solution Approach 1:
The patent changes the parameter of duty cycle from equal to unequal for different color light sources. By assigning different duty cycles (first duty cycle for red, second duty cycle for green, third duty cycle for blue) to different color light sources, the system achieves standard white light balance while optimizing light efficiency. This parameter change resolves the contradiction by allowing the display structure to remain simple without equal duty cycles, while achieving both proper white balance and improved light efficiency.
2Manufacturing precision
If color filters are used to generate different colors, then color accuracy is improved, but manufacturing cost increases and aperture ratio is reduced
Solution Approach 1:
The patent extracts and removes the color filters from the display structure. Instead of using color filters to generate different colors, the system uses separate light sources that directly emit red, green, and blue light. This extraction eliminates the need for color filters, thereby reducing manufacturing cost and increasing aperture ratio while maintaining color accuracy through the inherent properties of the light sources.
Solution Approach 2:
The patent replaces the mechanical/optical system of color filters with an electrical/optical system of multiple light sources. Instead of using physical color filters to modify white light, the system uses independently controllable light sources that directly emit the required colors. This substitution eliminates the need for color filter manufacturing and assembly, reducing cost and improving aperture ratio while maintaining color accuracy.
3Manufacturing precision
If color filters are used to generate different colors, then color display is achieved, but energy consumption increases
Solution Approach 1:
The patent extracts and removes the color filters from the system. By eliminating color filters, the system avoids the energy losses associated with filtering white light to produce colors. Instead, it uses light sources that directly emit the required colors, reducing energy consumption while maintaining color display capability through the inherent emission properties of the light sources.
4Reliability
If black matrix is disposed between color filters, then optical interference is prevented, but aperture ratio and light efficiency are reduced
Solution Approach 1:
The patent extracts and removes the black matrix from the display structure. By eliminating the black matrix, the system removes the optical interference prevention mechanism that was blocking light. Instead of relying on the black matrix to prevent interference, the system uses spatial and temporal separation of light sources, allowing the entire pixel area to be used for light emission, thereby maximizing aperture ratio and light efficiency while maintaining display quality.
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 approach enhances light efficiency, reduces energy consumption, and simplifies the formation of desired colors and white balance, increasing the aperture ratio and resolution while reducing manufacturing costs.
Implementation Method 1
The control device controls the light sources of different colors to emit light in different time frames with different duty cycles. Through persistence of vision, the light generated by the light sources will form an image of desired colors.
Data Source
AI summary
A liquid crystal display includes a plurality of light sources of different colors and a control device. The control device is used to control the light sources to emit light with different duty cycles. Through persistence of vision, light generated by the light sources will form an image of desired colors. White balance can be achieved by controlling the duty cycles.