Display Backlight Color Temperature Control via Segmented Light Sources
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Solution Overview
Problem
Liquid crystal display apparatuses face challenges in adjusting color temperature without losing aperture ratio, leading to decreased brightness and contrast ratio due to increased backlight intensity.
Innovation Solution
Incorporating a blue light source or a red light source into the backlight unit, with a processor that adjusts the aperture ratio of subpixels based on the target color temperature, allowing for precise control of light emission and intensity to maintain optimal brightness and contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the aperture ratio of the liquid crystal is adjusted to reach target color temperature, then color temperature is improved, but brightness is decreased and contrast ratio is decreased
Solution Approach 1:
The backlight unit is segmented into multiple independent light sources including a first light source (e.g., white light source), a second light source (e.g., blue light source), and a third light source (e.g., red light source). This segmentation allows selective activation of specific light sources to achieve target color temperature without adjusting the liquid crystal aperture ratio, thereby maintaining brightness and contrast ratio.
Solution Approach 2:
The invention changes the parameter approach from adjusting liquid crystal aperture ratio to adjusting the intensity parameters of multiple backlight light sources. By varying the emission intensity of each light source (first, second, and third light sources) based on gray level information, the system achieves color temperature adjustment while preserving aperture ratio, brightness, and contrast ratio.
2Temperature
If the aperture ratio of the liquid crystal is adjusted to reach target color temperature, then color temperature is improved, but contrast ratio is decreased
Solution Approach 1:
The backlight unit is segmented into multiple independent light sources including a first light source (e.g., white light source), a second light source (e.g., blue light source), and a third light source (e.g., red light source). This segmentation allows selective activation of specific light sources to achieve target color temperature without adjusting the liquid crystal aperture ratio, thereby maintaining brightness and contrast ratio.
Solution Approach 2:
The invention changes the parameter approach from adjusting liquid crystal aperture ratio to adjusting the intensity parameters of multiple backlight light sources. By varying the emission intensity of each light source (first, second, and third light sources) based on gray level information, the system achieves color temperature adjustment while preserving aperture ratio, brightness, and contrast ratio.
3Illumination intensity
If the backlight brightness is increased to compensate for aperture ratio loss, then brightness is improved, but energy consumption is increased
Solution Approach 1:
The invention changes the parameter approach from adjusting liquid crystal aperture ratio to adjusting the intensity parameters of multiple backlight light sources. By varying the emission intensity of each light source (first, second, and third light sources) based on gray level information, the system achieves color temperature adjustment while preserving aperture ratio, brightness, and contrast ratio.
Solution Approach 2:
The system dynamically adjusts the emission intensity of each light source based on real-time gray level information and color temperature requirements. This dynamic control allows the backlight to maintain optimal brightness and color temperature while minimizing energy consumption by activating only the necessary light sources at appropriate intensities.
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 enables the adjustment of color temperature without losing aperture ratio, improving black characteristics and contrast ratio while maintaining or reducing backlight brightness.
Implementation Method 1
a backlight unit comprising backlight circuitry and including a white light source and a blue light source
Implementation Method 2
The backlight unit may further include a red light source
Implementation Method 3
A liquid crystal display apparatus is a display apparatus to display a desired image by forming a liquid crystal layer having an anisotropic permittivity on an upper and a lower transparent insulating substrates, changing the molecular arrangement of a liquid crystal material by adjusting the intensity of the electric field formed in the liquid crystal layer thereafter, and adjusting the amount of light transmitted to a transparent insulating substrate
Data Source
AI summary
Disclosed is a display apparatus. The display apparatus includes a liquid crystal panel including a plurality of subpixels, a backlight unit including a white light source and a blue light source, and a processor configured to adjust the blue light source to emit light and to adjust an aperture ratio of at least one of the plurality of subpixels based on a color temperature of the white light source and a target color temperature.