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An introductory guide to Liquid Crystal Display Selection

To find a good match of LCD for your application, here are some questions you may consider asking yourself (or us!):

What combination of size and resolution do I need?

Size and resolution are the two top parameters to decide on at the very beginning of a selection process. And the resolution is also related to the aspect ratio.

As we see a trend for more widescreen displays in the market, products with related sizes and resolutions are available with more varieties as well

What are the different grades of displays and which grade do I need?

Most LCDs in the market can be divided to three categories: 1) Consumer grade; 2) Commercial/industrial grade; 3) Automotive/marine/aviation grade.

Consumer-grade products usually have a shorter lifetime and are designed for use under normal conditions, while commercial/industrial grade displays can achieve higher reliability and rigidity in tough environments and/or under heavy usage. Sample industrial applications include portable devices for fieldwork and control panels for industrial systems and room climate, etc.

For automotive/marine/aviation products, both environmental reliability and optical performance need to be the top of their class, featuring high brightness, extreme operating and storage temperatures, ultrawide viewing angles. They are usually highly customized to meet innovative design requirements and strict quality standards.

Check out our products at commercial, industrial, and automotive grades.

What are viewing modes for monochrome displays and how to choose based on lighting conditions?
Depending on the transmission modes of the polarizers, there are three viewing modes for monochrome LCDs: transmissive, reflective, and transflective mode.  Learn more about viewing modes for passive monochrome displays. In terms of the content, displaying dark images on a light background is called a positive (+) mode, and vice versa for negative (-) mode. Transmission modes and +/- modes are usually selected based on the lighting condition, display content, and product appearance. The table below could serve as a quick index for your application.  
Viewing Mode Display Description Application Comments Direct Sunlight Office Light Very Low Light
Reflective (Positive) Dark images on a light background No backlighting. Gives the best contrast and environmental stability Excellent Very good Unusable
Transflective (Positive) Dark images on a gray background Can be viewed with both ambient light and backlighting Excellent (no backlight) Good (no backlight) Very Good (backlight)
Transflective (Negative)* Light gray images on dark background Requires high ambient light or backlighting Good (no backlight) Fair (no backlight) Very Good (backlight)
Transmissive (Negative) Backlight images on dark background Cannot be viewed by reflection Poor (backlight) Good (backlight) Excellent (backlight)
Transmissive (Positive)* Dark images on a backlight background Good for very low-light conditions Poor (backlight) Good (backlight) Excellent (backlight)

1Microchip. LCD Fundamentals and LCD Driver Module of 8-bit PIC Microcontrollers. http://ww1.microchip.com/downloads/en/Appnotes/AN658-LCD-Fundamentals-and-the-LCD-Driver-Module-of-8-Bit-PIC-MCUs-00000658C.pdf
How to define viewing angles and select panel types?

Viewing angle is the angle at which the contrast ratio is greater than 10. Display viewings are determined for the horizontal or 3, 9 o’clock direction and the vertical or 6, 12 o’clock direction with respect to the optical axis which is normal to the LCD surface.

Viewing angles are majorly determined by LCD panel type based on switching modes.

Twisted Nematic (TN) displays usually have a certain recommended viewing direction (6 o’clock or 12 o’clock) with grayscale inversion happening on the opposite side. This phenomenon is related to the horizontal orientation of neatly arranged liquid crystals under voltage.

On the contrary, wide viewing technologies, such as FFS/IPS TFT (our ADSDS TFT) and VA LCD (our IBN LCD), enable displays to be viewable from all directions and retains a 10:1 contrast ratio up to almost 90 degrees from the normal axis. Wide viewing is a vital factor to consider for many portable, orientation-switchable devices, as well as higher grade applications.

Learn more about switching modes for TFT and Passive LCD.

What are the common operating and storage temperature ranges for LCDs?
The physical and chemical characteristics of Liquid Crystal Displays are susceptible to the surrounding environment, especially the temperature, humidity, and air pressure. To ensure an acceptable performance level under temperature changes, LCD products usually define an operating and a storage temperature. These specifications are based on results from environmental/reliability tests according to IEC 60068-2 Electronic Equipment & Product Standards High and low operating temperatures determine the ability of LCDs to be used at these temperatures for a period of time. LCDs should be able to display, refresh, and recover its performance afterward. Similarly, storage temperatures refer to the ability of LCDs to be stored or transported at a certain temperature. Therefore, storage temperatures are usually 0~20°C wider than operating temperatures. Operating temperatures can tell whether the display can be used outdoors or in tough environments. Common ranges of operating temperatures for LCDs and their applications are summarized in the table below. Table of common operating temperatures and applications
Temp. type Low operating temperature High operating temperature Display Type Display Grade Application
Normal -10 ~ 0°C +50 ~ +60°C LCD, ePD Consumer/ Commercial Indoor
Wide -20°C +70°C LCD Commercial/ Industrial Outdoor/ Industrial
Ultra-wide -45 ~ -30°C +80 ~ +85°C (TFT)/ +95°C (Mono LCD) LCD Automotive Automotive

2 “IEC.” IEC 60068-2:2020 SER | IEC Webstore. webstore.iec.ch/publication/62437.
What determines the brightness/luminance of LCD and how bright is enough for my application?

Brightness, or luminance, is measured from the display surface in a dark room, with all pixels displaying white after lighting the backlight. It’s usually quantified in Candela per square meter (Cd/m2 or nit).

Common brightness of LCDs can be categorized into three levels:

  • Low-to-medium brightness (~250nits)
  • Medium brightness (300~550nits)
  • High brightness (600~1000+nits) 

Under relatively dim lighting conditions, ~250nits’ brightness LCD can display readable content with the benefit of low cost and power consumption. For most day-to-day indoor uses, 300~500 nits’ brightness is commonly seen in laptops, monitors, and mobile phones.

However, for outdoor or some indoor situations where the display is facing direct sunlight or strong ambient light, higher brightness and surface treatment (e.g. anti-glare/anti-reflection film) becomes necessary to improve the readability. 

Most automotive-grade LCDs have very high brightness (800~1200+nits). And our industrial-grade LCDs offer high luminance options as well. Many LCD modules also have the potentials to increase brightness by customizing their backlights.

What are common interfaces for LCDs by size and application?

To communicate between your graphic card/memory card and the LCD, many display modules are configured with a default interface their controller IC supports. Interface protocols are usually limited by their transmission modes, and the bandwidth they can support. The display bandwidth is determined by its resolution, pixel RAM, frame rate, and the number of colors.

Common display interfaces and their LCD applications are shown in the table below.

Table of common display interfaces and applications

Interface Transmission LCD Size Display Type and Application
SPI Serial 1~2” Small sized LCD, EPD, POLED
I2C Serial <3.5” Small sized LCD, most CTP
MCU/CPU Parallel <3.5” Small sized LCD and TFT
RGB Parallel 3.5~7” Common medium sized TFT for industrial display
MIPI Serial 4.3~7” Medium sized TFT for handheld/smart phone/tablet
eDP Serial >11” Large, high resolution screens for PC/notebook
LVDS Serial >7” Large sized TFT for Industrial/automotive display
FPD-Link Serial >5” For automotive display

 

Generally, SPI and MCU interfaces are used for passive-matrix LCDs and some small sized TFTs, I2C also supports capacitive touch panels in addition to the LCDs above.

RGB and LVDS are two widely used commercial/industrial interfaces for medium (3.5~7”), and large (>7”) sized TFT displays, respectively.

There are also several other interfaces prevailing in their specialized applications: 1) MIPI for mobile phones and other handheld devices; 2) eDP for laptops and tablets; and 3) FPD-Link for unified automotive connectivity.

Display Selection Decision Tree

Overwhelmed with information? No worries! We’ve prepared a decision tree below to help you navigate through the process of finding the right display for your application.

After sketching a silhouette of the display you need, feel free to check out our products and build up your RFQ carts or give us a call directly – we are here to help you!

 

Editor: Charis Chen

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Company Mission & Vision

Leveraging our extensive history of innovation, solid technological base, and rich production experience, BOE Varitronix is able to provide comprehensive, cost-effective, and high-quality value-added services.

Driven by our corporate values of “Collaboration, Innovation, and Conservation”, we endeavor to apply our technology to various small-to-medium-sized displays. Our ultimate goal is to reveal and visualize colorful images and add bountiful colors to life.

Our vision is to be the Best On Earth display solution company with a world-class reputation for innovation, quality, customer orientation, governance, and corporate strategy.

BOE Varitronix – About Us

Since the Company’s inception by a team of enterprising academics at the University of Hong Kong in 1978, Varitronix have grown to become one of the leading manufacturers of Liquid Crystal Displays through years of innovation in research, design, production scalability, and technology advancement.

Through the following years of finding local success, Varitronix envisioned a much larger scale operation for the ever-increasing demand for displays. The trajectory plan eventually led the Company to be officially listed on the Hong Kong Stock Exchange in 1991 (HKSE code: 710), continuing its influence and strong presence to serve customers at the local, national, and global levels.

In 2016, BOE, an IoT company providing intelligent interface products and services for information interaction and human health, sought interest and became a major shareholder of Varitronix, which fueled the Company into the next great leap forward. BOE Varitronix, as the Company is now called, reflects purely on our integration leading to sustainable development in business, innovation technology, capital, and resource utilization.

Nearly half a century later, BOE Varitronix continues its time-honored tradition in providing the one stop shop for the latest display technologies, backed up by solid research and commitment to quality, customized to the individual needs, and delivered economically and efficiently.