What is the A-grade standard for industrial LCD panels?
The specific standards for "A-grade " LCD screens currently lack an officially disclosed document from major manufacturers that clearly defines all technical thresholds for "A-grade "
The specific standards for "A-grade" LCD screens currently lack an officially disclosed document from major manufacturers that clearly defines all technical thresholds for "A-grade." Such detailed grading criteria are typically used internally by panel manufacturers for quality control and application purposes and are not fully made public.
However, based on the common understanding within the industry and some product parameters, I can outline the typical meanings of Industrial LCD Panel Grade A and the underlying standards it refers to.
Understanding the "specifications" of a screen
Liquid crystal displays are classified into grades based on the results of multiple stringent tests during production. The table below clearly outlines the common grades and their primary characteristics
Level | Core features | Typical Applications |
A regulation | No bright spots, dark spots, color spots or other bad spots, or the number of bad spots is extremely small and within the allowable range of the standard; The appearance is brand new and scratch free, the electrical and optical performance fully meet the standards, and the lifespan meets the specifications. | Products with high display quality requirements, such as high-end medical equipment, industrial controllers, commercial displays, and flagship consumer electronics products. |
B regulation | Allow a small number of bad pixels within a certain standard range; There may be slight color uniformity issues or minor flaws in appearance. | Devices with high tolerance for display defects, such as some industrial instruments, low-end displays, and monitoring equipment screens. |
C regulation | There are a large number of bad pixels and obvious display defects, which may result in uneven brightness, color spots, and other issues. | There are a large number of bad pixels and obvious display defects, which may result in uneven brightness, color spots, and other issues. |
Please note that the above descriptions of regulations B and C are based on industry experience and may vary depending on the specific definitions of different manufacturers.
Potential standard dimensions of the AU A-standard screen
Although there is no publicly available "A-grade" standard document, a qualified AU A-grade industrial screen must meet or exceed the following performance commitments in its official specifications, which are also key dimensions for determining whether it meets A-grade requirements:
Dimension | Explanation and Examples |
Pixel defect | This is the most intuitive standard. A standard screen requires no bright spots, dark spots, color spots or other bad pixels, or the number of bad pixels is controlled within extremely strict standards. |
Optical performance | All optical parameters, such as brightness, contrast, and color gamut, must meet the requirements of the specification sheet. For example, an A-gauge screen with a nominal brightness of 400 cd/m ² and a contrast ratio of 600:1 must have its actual measured value within the allowable tolerance range |
Appearance and Structure | The screen surface is free of any scratches, dents, or contamination. For example, the surface matte or mirror finish is intact and undamaged, and the overall structure is not deformed. |
Working life and reliability | The backlight lifespan (such as nominal 12K hours or 30K hours) and wide temperature operating characteristics (such as operating temperature of 050 ° C or 1060 ° C) of A standard screens must meet the standards to ensure stable operation in harsh environments. |
Interface and Signal | The electrical characteristics of interfaces such as LVDS or eDP must be fully compliant to ensure stable signal transmission without flickering screens. |
How to confirm and select A-sized screens
Since there are no publicly available standards, you can ensure that you obtain genuine A-grade products during procurement through the following methods:
Direct contact with official or authorized agents: The most reliable way is to directly contact AU Optronics or its authorized agents, clearly request "A-grade" products, and ask them to provide quality commitments based on the specification sheet.
Carefully review the specification sheet: After receiving the specific model specification sheet, check all parameters one by one to ensure that the batch you purchased can achieve the nominal performance.
Request for quality assurance: In the procurement contract, it is explicitly required that the supplier guarantees that the screens provided are "A-grade" products, and agrees on bad pixel standards, warranty terms, etc.
Self testing or commissioned testing: For important projects, sampling can be used for testing to verify whether their optical performance, bad spot conditions, working temperature, etc. meet the expectations of Regulation A.
I hope the above information can help you have a more comprehensive understanding of the standards for AU A-grade LCD screens. If you are selecting for a specific project, why not share the general application scenarios and performance requirements? Perhaps I can help you analyze which parameters need to be focused on together.
