Strip Shielding Parts Reduce Parasitic Capacitance in ADS Display Panels
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Solution Overview
Problem
Current advanced super dimension switch (ADS) mode liquid crystal display panels face issues with increased parasitic capacitance due to data signal lines, leading to reduced transmittance and operational failures in large-size display devices, especially when displaying half-white half-black images, as the parasitic capacitance interferes with the effective electric field, causing light leakage and decreased pixel opening regions.
Innovation Solution
The implementation of first and second shielding parts on the display panel, which are strip structures extending in the same direction as the data signal lines, strategically positioned to shield electric field lines and reduce the width of the black matrix, thereby minimizing interference with the effective electric field and increasing the opening areas of sub-pixel units, while also reducing storage capacitance and line widths of signal lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the pixel electrode is covered in the range of data signal lines to achieve high transmittance, then the transmittance is improved, but the parasitic capacitance of the data signal lines increases by 2-3 times
Solution Approach 1:
A shielding structure is introduced as an intermediary element between the data signal line and the pixel electrode. The shielding structure includes a first shielding part extending in the row direction and a second shielding part extending in the column direction, forming a grid-like shield that intercepts electric field lines before they can reach the pixel electrode, thereby reducing parasitic capacitance while preserving transmittance
2Object-affected harmful factors
If the black matrix width is increased to shield data signal lines, then parasitic capacitance interference is reduced, but the pixel opening region decreases
Solution Approach 1:
The shielding function is segmented from the black matrix structure. Instead of using a continuous black matrix that covers the entire data signal line area, the shielding is divided into discrete first and second shielding parts that are strategically positioned to intercept electric field lines while leaving the pixel opening regions uncovered, thus maintaining both shielding effectiveness and light transmission area
3Reliability
If the data signal line width is increased to reduce parasitic capacitance effects, then signal stability is improved, but the black matrix width must be increased further reducing pixel opening regions
Solution Approach 1:
The shielding structure acts as an intermediary that decouples the relationship between signal line dimensions and shielding effectiveness. By positioning the first and second shielding parts adjacent to the data signal line, the patent provides electromagnetic shielding without requiring increased signal line width, thereby maintaining signal stability while preserving pixel opening regions
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 solution effectively reduces parasitic capacitance, enhances transmittance, and maintains the operational integrity of the display panel by minimizing the influence of data signal lines on the effective electric field, allowing for improved light transmission and reduced black matrix width, thus addressing the issues of light leakage and pixel opening region loss.
Implementation Method 1
the first shielding parts load stable signals, so that when the data signal lines generate electric field lines to a sub-pixel unit region, the electric field lines will be shielded by the first shielding parts
Implementation Method 2
the parasitic capacitance of the data signal lines will increase by the order of magnitudes of 2-3 times
Data Source
AI summary
Disclosed in the disclosure are a display panel and a display device. The display panel includes: a first base substrate; a plurality of scan signal lines arranged on a side of the first base substrate; a plurality of data signal lines arranged on sides, facing away from the first base substrate, of the scan signal lines; and first shielding parts arranged on sides, facing away from the scan signal lines, of the data signal lines, wherein each first shielding part is of a strip structure, and in each sub-pixel unit, both sides of the data signal line are each provided with one first shielding part.