كيفية اختيار الشركات المصنعة لشاشات الكريستال السائل لشريحة VA: 8 نقاط رئيسية من المعلمات وأخذ العينات إلى العرض المستقر

2026-09-19 10:53:09

VA segment LCD panels are suitable for instrumentation, medical devices, automotive electronics, smart home products and other applications that require a black background, high contrast and good multi-angle readability. TN segment LCD panels are suitable for projects with simple display structures, tight cost requirements and low power consumption targets.

When selecting a custom LCD manufacturer, buyers should look beyond unit price. Important evaluation factors include display parameters, tooling documentation, sample lead times, quality management systems, production testing and long-term supply capability.

Dongguan Fangsheng Electronics Co., Ltd. provides custom LCD and display module solutions covering VA, TN and other LCD technologies for industrial, medical, automotive, smart home and consumer electronics applications.

1. Differences Between VA Segment LCD and TN Segment LCD

Both VA and TN segment LCDs can display digits, symbols, units and fixed icons, but they differ in display performance, viewing angle characteristics and application suitability.

VA Segment LCD

VA segment LCD panels commonly use a dark or black background with white, blue or other colored backlights. They can provide high contrast and good readability from multiple viewing directions.

VA LCD solutions are suitable for products where visual appearance, off-axis readability and display contrast are important, including:

• Industrial instrumentation

• Medical devices

• Automotive electronics

• Smart home control panels

• Home appliances

• Consumer electronic products

• Control panels and measuring equipment

The final display performance depends on the LCD structure, polarizers, backlight, viewing direction, glass design and mechanical construction of the end product.

TN Segment LCD

TN segment LCD panels use a mature and relatively simple LCD structure. They are commonly selected when cost efficiency, low power consumption and straightforward segment display requirements are important.

TN LCD displays are suitable for products that mainly require:

• Numbers

• Units

• Fixed icons

• Simple status indicators

• Low power consumption

• Cost-effective display solutions

The primary viewing direction should be defined during the design stage. Contrast and readability may decrease when the display is viewed outside the specified viewing direction.

Which LCD Technology Should You Choose?

VA and TN segment LCDs should not simply be classified as high-end and low-end technologies. The appropriate solution depends on the actual product requirements.

Important factors include:

• Viewing direction

• Required viewing angle

• Ambient lighting conditions

• Backlight color

• Power consumption

• Operating temperature

• Display appearance

• Mechanical structure

• Target production volume

• Overall product cost

For custom LCD projects, the final selection should be verified through display drawings, engineering samples and testing on the actual end product.

If your project also considers color TFT displays, resolution should be evaluated in addition to outline dimensions. Resolution affects interface layout, graphic details, text readability, main controller configuration, power consumption and development requirements.

2. Documents Required for Custom VA Segment LCD Enquiries

Complete technical information helps LCD manufacturers evaluate the project accurately and prepare suitable quotations.

When submitting a custom VA segment LCD or TN segment LCD enquiry, customers are recommended to provide the following information:

• Product application and operating environment

• LCD outline dimensions

• Viewing window dimensions

• Installation clearance

• Digits, text, units and icons to be displayed

• Positive mode or negative mode

• Background and segment color requirements

• Primary viewing direction

• Required viewing angle

• Operating voltage

• Main controller IC or mainboard information

• Connection method such as metal pins, FPC or rubber connector

• Backlight color

• Backlight brightness requirements

• Power consumption requirements

• Operating temperature

• Storage temperature

• Indoor or outdoor application

• Sample quantity

• Estimated monthly or annual volume

• Target mass production date

If available, customers should also provide LCD drawings, display artwork, existing samples, mainboard documents and pinout definitions.

These documents allow the manufacturer to evaluate glass dimensions, segment layout, routing space, connector position, FPC structure and backlight construction more accurately.

Product photos alone are usually not sufficient for an accurate custom LCD quotation.

Providing complete technical information at the beginning can reduce repeated communication and minimize design changes during later development stages.

3. Key Parameters to Confirm Before LCD Tooling

Tooling is an important stage in custom LCD manufacturing. Incorrect display artwork or mechanical dimensions may result in tooling modification, additional engineering costs and delayed delivery.

Before tooling starts, customers and manufacturers should confirm the following parameters:

• LCD outline dimensions

• Viewing window dimensions

• Glass thickness

• Glass type

• Segment pattern

• Font size

• Icon position

• Pin quantity

• Pin pitch

• FPC position

• Viewing direction

• Positive or negative display mode

• Operating voltage

• Duty cycle

• Bias ratio

• Backlight structure

• Mounting method

For VA segment LCD panels, special attention should be paid to:

• Background appearance

• Segment color

• Backlight color

• Backlight brightness

• Viewing angle

• Contrast

• Display uniformity

The black background effect of a VA LCD is not determined by LCD mode alone. Polarizer selection, backlight design, panel structure, ambient lighting and the mechanical housing of the end product can all affect the final visual result.

Before tooling begins, the final versions of the display drawing, mechanical drawing, connection definition and key electrical parameters should be confirmed by both parties.

This helps prevent issues such as missing segments, incorrect dimensions, pin mismatches or incompatibility with the customer's mainboard.

4. Factors That Affect VA Segment LCD Pricing

There is no universal price for a custom LCD display. The final quotation depends on the technical specifications and production requirements of each project.

Major cost factors include:

• Glass outline dimensions

• Glass utilization

• LCD display mode

• Liquid crystal material

• Polarizer type

• Segment complexity

• Operating temperature range

• Connection method

• Backlight configuration

• Testing requirements

• Order quantity

VA LCD solutions may require specific liquid crystal materials, polarizers and backlight matching. Therefore, their cost structure can differ from standard TN segment LCD displays.

Additional requirements such as wide temperature operation, high brightness, multi-color printing, special-shaped glass, customized FPC structures or stricter reliability testing may also affect the quotation.

Custom LCD projects may include initial photomask, tooling and engineering development costs.

When comparing quotations from different LCD manufacturers, buyers should confirm whether the quoted price includes:

• LCD panel

• Backlight

• FPC

• Tooling

• Engineering development

• Samples

• Testing

• Packaging

• Shipping

• Taxes or other applicable charges

Comparing unit prices alone can create an inaccurate picture of the total project cost.

Standard off-the-shelf LCD panels have fixed dimensions and specifications, while custom LCD displays require engineering evaluation based on the display content, glass dimensions, connection structure and application environment.

5. Custom LCD Sample and Mass Production Lead Times

According to the production specifications provided by Dongguan Fangsheng Electronics Co., Ltd., standard custom LCD sample lead time is approximately 12 days, while mass production typically takes approximately 25 to 30 days.

For projects integrating COG, COB, backlight, FPC or other module assemblies, the project should be evaluated as an LCM module.

Typical LCM timelines are:

• LCM samples: approximately 3 to 4 weeks

• LCM mass production: approximately 4 to 6 weeks

For TFT display modules:

• TFT samples: approximately 2 to 4 weeks

• TFT mass production: approximately 4 to 6 weeks

Actual lead times depend on the display size, resolution, display artwork, tooling status, material availability, connection structure, backlight configuration and testing requirements.

Projects with complete technical documentation and timely drawing approval generally have a clearer production schedule.

If the display artwork, mechanical dimensions or connection structure changes after confirmation, the sample and mass production schedule should be reconfirmed.

6. Minimum Order Quantity for Custom Segment LCD

Custom VA segment LCD and TN segment LCD products do not have one fixed MOQ that applies to every project.

According to Dongguan Fangsheng Electronics Co., Ltd., MOQ can vary depending on LCD dimensions and project requirements. A small pilot production run can be arranged for a new model.

When discussing MOQ, buyers should provide:

• LCD dimensions

• Display technology

• Sample quantity

• Estimated annual demand

• Expected repeat order frequency

• Target mass production volume

The manufacturer can then evaluate the appropriate production quantity based on glass utilization, material procurement and production batch requirements.

For projects where future demand is uncertain, a sample and pilot production stage can help verify display quality, assembly compatibility and production consistency before larger-volume production.

7. Tests to Complete Before Mass Production

A sample that lights up correctly does not automatically mean that the LCD is ready for mass production.

Display, electrical, mechanical and environmental validation should be completed according to the requirements of the end product.

Basic LCD inspection may include:

• Outline dimensions

• Viewing window dimensions

• Segment content

• Missing segments

• Extra segments

• Crosstalk

• Background appearance

• Contrast

• Viewing angle

• Backlight uniformity

• Connection reliability

• Assembly compatibility

The displayed digits, units and icons should be checked to ensure that they are clearly visible under actual operating conditions.

For TFT display modules, additional inspection may include:

• Resolution

• Graphic rendering

• Text readability

• Color performance

• Brightness

• Viewing angle

Electrical testing can include:

• Operating voltage

• Driving waveform

• Power consumption

• Connection performance

• Continuous operation stability

For products operating across a wide temperature range, high and low temperature operating tests and storage tests should be conducted according to the defined product specifications.

For automotive, industrial or vibration-sensitive applications, additional testing may include:

• Vibration

• Mechanical shock

• Humidity and heat

• ESD

• Aging

• Environmental reliability

Each test should reference the confirmed drawing revision, datasheet, test conditions and acceptance criteria.

If a nonconformity is identified, root cause analysis, corrective action and re-validation should be completed before mass production approval.

8. How to Maintain Long-Term Custom LCD Supply Stability

Long-term supply reliability should not be judged only by the manufacturer's total production capacity.

Buyers should also evaluate the practical production capacity available for the specific project, material supply, engineering support, quality control and production scheduling.

Dongguan Fangsheng Electronics Co., Ltd. reports a monthly production capacity of approximately 3 million pieces.

During supplier evaluation, buyers should also confirm:

• Production capacity allocated to the project

• Current production schedule

• Raw material availability

• Material lead times

• Expected monthly delivery capacity

• Engineering support

• Quality control procedures

Long-term cooperation also requires effective document and version management.

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