RGBW Pixel Scanning Line Containment for LCD
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Solution Overview
Problem
The RGBW square pixel structure in liquid crystal display devices increases energy consumption and reduces display uniformity due to increased scanning lines and driving frequency, leading to insufficient writing time and display quality deterioration.
Innovation Solution
A scanning line is sequentially drawn into each pixel area of the RGBW square pixels, ensuring its entire width is contained within the pixel area, reducing exposure and coupling capacitance, and optimizing the layout of signal and auxiliary capacitance lines to minimize energy consumption and improve display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the RGBW square pixel structure is used to improve color purity and brightness, then display quality is improved, but the number of scanning lines doubles causing writing time to become insufficient and energy consumption to increase significantly
Solution Approach 1:
The pixel structure is segmented into four distinct subpixels (R, G, B, W) arranged in a square configuration, allowing independent control of each subpixel through dedicated signal lines while sharing a common scanning line, thus achieving high color purity and brightness without proportionally increasing scanning line count
Solution Approach 2:
A single scanning line serves multiple functions by being shared among four different subpixels (R, G, B, W) within the same pixel unit, enabling the scanning line to activate different subpixels at different times while reducing the total number of scanning lines required
2Object-affected harmful factors
If the scanning line is placed under reflecting electrodes to reduce exposure, then coupling capacitance increases and causes display quality deterioration, but placing it at the gap exposes the line and still causes display quality deterioration
Solution Approach 1:
The scanning line is positioned specifically within the pixel area boundaries, creating a localized arrangement where the line is contained within the active display region. This local optimization ensures that the scanning line does not create excessive coupling capacitance with reflecting electrodes while remaining visible only within the intended pixel boundaries, thus maintaining display quality
Solution Approach 2:
The scanning line arrangement breaks the symmetric placement under reflecting electrodes by positioning the line asymmetrically within the pixel area, specifically containing it within the pixel boundaries rather than placing it centrally under multiple reflecting electrodes, thereby reducing unwanted coupling capacitance effects
3Measurement precision
If the number of scanning lines is increased to match the RGBW square pixel structure, then each pixel can be addressed individually, but the writing time becomes insufficient and driving frequency must increase
Solution Approach 1:
The pixel structure is segmented into four distinct subpixels (R, G, B, W) arranged in a square configuration, allowing independent control of each subpixel through dedicated signal lines while sharing a common scanning line, thus achieving high color purity and brightness without proportionally increasing scanning line count
Solution Approach 2:
The scanning line dynamically switches between different subpixels within the same pixel unit at different time intervals, allowing a single scanning line to address multiple subpixels sequentially, thereby maintaining precise pixel addressing while reducing the total number of scanning lines and extending writing time
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 ensures sufficient writing time for image signals, reduces energy consumption in the driving circuit, and enhances display uniformity and quality by containing the scanning line within each pixel area and optimizing line arrangements.
Implementation Method 1
Liquid crystal display devices are commercially well-known
Implementation Method 2
reflective liquid crystal display devices
Data Source
AI summary
According to one embodiment, a display device includes a unit pixel includes a first pixel including a first pixel electrode, a second pixel including a second pixel electrode, a third pixel including a third pixel electrode, and a fourth pixel including a fourth pixel electrode, a scanning line electrically connected to the first to fourth pixels, and first to fourth signal lines extending in the column direction and disposed at intervals in the row direction, the first to fourth signal lines electrically connected to the first to fourth pixels, respectively, wherein the first to fourth pixel electrodes are light reflective, and the scanning line is sequentially drawn into each pixel area of the first to fourth pixels in a manner that an entire width of the scanning line is contained within each pixel area.