Liquid Crystal Display Transparency Control via YUV Data Embedding
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Solution Overview
Problem
Liquid crystal display devices with specific pixel values allocated for see-through display cannot accurately display certain colors, such as white, and require complex time division management of display and lighting-pattern image data, leading to image deterioration.
Innovation Solution
A liquid crystal display device that converts input image data to YUV422 format, adds transparency information to color-difference components, and extracts this information to control pixel transparency, allowing for field-sequential color image display while enabling see-through functionality by managing backlight emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a specific pixel value is allocated for see-through display, then transparency is achieved, but color display accuracy deteriorates
Solution Approach 1:
The patent segments the image data processing into two independent streams: one for color image data (RGB) and one for transparency control data (luminance Y). This segmentation allows the color and transparency functions to operate independently without interfering with each other, resolving the contradiction between color accuracy and transparency.
Solution Approach 2:
The patent adds a new dimension to the image data structure by incorporating luminance information from YUV conversion as a separate transparency control channel. This dimensional expansion allows simultaneous control of color (RGB) and transparency (Y) without sacrificing either function.
2Reliability
If display image data and lighting-pattern image data are provided in time division manner, then image deterioration is prevented, but drive complexity increases
Solution Approach 1:
The patent merges the display image data and lighting-pattern image data into a single frame period, eliminating the need for time division management. The image processing portion simultaneously processes both types of data within the same frame, reducing drive complexity while maintaining image quality.
Solution Approach 2:
The image processing portion is designed with multi-functionality to handle both display image data and lighting-pattern image data through a unified processing pipeline. This universal processing approach simplifies the drive mechanism by eliminating separate processing paths while ensuring both data types maintain their quality.
3Measurement precision
If field-sequential drive is used for color image display, then resolution is improved, but transparency control becomes difficult
Solution Approach 1:
The patent implements continuous transparency control throughout the entire field-sequential drive cycle by maintaining luminance data for all three color fields (R, G, B). The transparency state remains consistent across all fields, eliminating the need for complex field-by-field transparency management while preserving high resolution.
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
Enables the display of all colors using field-sequential drive while allowing the background to be viewed through the device, improving image quality and simplifying the drive mechanism by integrating transparency control into the image processing and backlight management.
Implementation Method 1
a liquid crystal display device which displays a color image by separating a frame consisting of a plurality of fields into the individual fields and displaying an image in a different color for each field
Implementation Method 2
red, green, and blue LEDs (light-emitting diodes), which constitute a backlight source, are sequentially switched around and lit up for their respective fields
Data Source
AI summary
When transparency information (T) is externally inputted along with RGB image data (DV1), the RGB image data (DV1) is converted to YUV image data (DV2) in YUV422 formal, and the transparency information (T) is added to information about a color-difference component U or V therein, thereby generating YUV image data (DV3) to be inputted to a signal processing portion (20). The signal processing portion 20 extracts the transparency information (T) and converts the YUV image data (DV2) to RGB image data (DV1). When the RGB image data (DV1) and the transparency information (T) are inputted to an LCD timing controller (30), the LCD timing controller 30 renders a liquid crystal display panel (90) transparent on the basis of the transparency information (T), thereby allowing background light to be transmitted therethrough, or when only the RGB image data (DV1) is inputted, the liquid crystal display panel (90) displays an image.