LCD Subpixel Voltage Division via Switching Element On-Resistance
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Solution Overview
Problem
Conventional liquid crystal display (LCD) devices face challenges in improving side visibility and aperture ratio due to the need for separate transistors for voltage division and contact holes, which limit the distance between subpixel electrodes and affect transmittance.
Innovation Solution
The LCD device applies different voltage levels to two subpixel electrodes within a pixel unit without a separate transistor for voltage division and eliminates the need for a contact hole connected to the transistor, using switching elements with varying on-resistance values to achieve this, thereby improving side visibility and aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a separate transistor for voltage division and contact hole are employed, then voltage levels can be divided for subpixel electrodes, but the distance between subpixel electrodes increases and aperture ratio decreases
Solution Approach 1:
The invention extracts and removes the separate voltage division transistor and its associated contact hole from the pixel structure. By eliminating these unnecessary components, the patent achieves both voltage division functionality (through differential on-resistance of switching elements) and improved aperture ratio (by reducing the area occupied by non-active components).
Solution Approach 2:
The switching elements in the invention serve multiple functions: they act as both the switching transistor for pixel control and the voltage division mechanism. By making the switching elements have different on-resistance values, they simultaneously perform switching and voltage division without requiring a separate voltage division transistor, thus improving aperture ratio while maintaining functionality.
2Ease of operation
If a separate transistor for voltage division is employed, then voltage levels can be divided for subpixel electrodes, but transmittance decreases due to additional contact holes
Solution Approach 1:
The invention removes the additional contact hole that would be required for a separate voltage division transistor. By using the existing switching element contact holes for dual purposes (switching control and voltage division), the patent eliminates the need for extra contact holes, thereby improving light transmittance while maintaining voltage division capability.
3Ease of manufacture
If switching elements with different on-resistance values are used, then different voltage levels are applied to subpixel electrodes for improved side visibility, but manufacturing precision requirements increase
Solution Approach 1:
The invention applies local quality by giving different on-resistance characteristics to different switching elements within the same pixel. Specifically, the red subpixel switching element has a higher on-resistance than the blue subpixel switching element, allowing different voltage levels to be applied to each subpixel electrode. This localized differentiation enables improved side visibility while using standard manufacturing processes.
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 side visibility and transmittance by allowing different voltage levels to be applied to subpixel electrodes, improving the alignment of liquid crystal molecules and increasing the aperture ratio without the need for additional transistors or contact holes.
Implementation Method 1
An on-resistance value of the second switching element may be larger than an on-resistance value of the first switching element
Implementation Method 2
a voltage is applied to the electric field generating electrodes so as to generate an electric field in the liquid crystal layer, which thus determines the orientation of liquid crystal molecules of the liquid crystal layer and controls the polarization of incident light
Data Source
AI summary
A liquid crystal display device includes a data driving unit connected to a first data line disposed in a first direction, a gate driving unit connected to a first gate line disposed in a second direction, a first subpixel unit including a first switching element, a gate electrode of which is connected to the first gate line, one electrode of which is connected to the first data line and the other electrode of which is connected to a first subpixel electrode, and a second subpixel unit including a second switching element, a gate electrode of which is connected to the first gate line, one electrode of which is connected to the first data line and the other electrode of which is connected to a second subpixel electrode, wherein an on-resistance value of the second switching element is larger than an on-resistance value of the first switching element.