Display Apparatus with Independent RGB Backlight Units for Color Saturation
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Solution Overview
Problem
Conventional liquid crystal displays suffer from poor color saturation due to leakage of unwanted light spectra when displaying specific colors, affecting the quality of the displayed images.
Innovation Solution
The display apparatus employs independent red, green, and blue light-emitting backlight units that adjust their intensity based on the color mode, mixing lights into white in brightness mode and reducing specific intensities to enhance color saturation by using local dimming and a white light-emitting backlight unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional color filters are used to separate light spectrums, then the display can show red, green and blue images, but light leakage occurs causing poor color saturation
Solution Approach 1:
The backlight module is divided into three independent color light sources (red, green, blue LEDs) instead of using a single white light source with color filters. Each color light source corresponds to a specific color sub-pixel area, enabling independent control and eliminating cross-color light leakage that causes poor color saturation.
Solution Approach 2:
Different color light sources are selectively activated in different local areas corresponding to red, green, and blue sub-pixels. The control circuit independently controls the intensity of each color light source based on the display image requirements, optimizing color saturation locally for each color region.
2Measurement precision
If multiple color backlight units are used to improve color saturation, then color mode performance improves, but brightness mode performance may be affected
Solution Approach 1:
The control circuit dynamically adjusts the intensity of each color light source based on the display mode (color mode or brightness mode) and the specific display image requirements. In color mode, individual color intensities are optimized for saturation; in brightness mode, all color light sources work together to maximize overall luminance.
Solution Approach 2:
The same three-color backlight module serves dual purposes: it provides high color saturation when operating in color mode with selective color activation, and delivers high brightness when operating in brightness mode with all color light sources activated together, eliminating the need for separate backlight systems.
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 effectively reduces light leakage and improves color saturation by dynamically adjusting light intensities and mixing white light, resulting in enhanced image quality.
Implementation Method 1
a color filter and a first backlight unit to a third backlight unit independently emitting lights respectively... configured to independently emit a first color light, a second color light and a third color light to the color filter respectively
Data Source
AI summary
A display apparatus is disclosed. The display apparatus includes a color filter, a first backlight unit, a second backlight unit and a third backlight unit. The first backlight unit, the second backlight unit and the third backlight unit are disposed relative to the color filter and independently emit a first color light, a second color light and a third color light to the color filter respectively. In a brightness mode, the first color light has a first intensity, the second color light has a second intensity and the third color light has a third intensity. In a color mode, when a display image of the display apparatus is biased to a third color corresponding to the third color light, the display apparatus reduces at least one of the first intensity and the second intensity.