Technology QA

Technology Innovation
About BOE
Technology Q&A

Q: Does a larger generation number of LCD panel production line mean that it is more
advanced?

A: No. The generation number of LCD panel production line is determined according to the size of glass substrate. A larger number means a
larger size of panel that the substrate can be economically cut into. By economical cutting we mean that the glass substrate of a given size is used to the maximum through rational planning and cutting calculation. To produce large-sized panels for TV, you will need at least a Gen 6 production
line to achieve most economical cutting and most efficient use of glass substrates.
    In addition, the same core technology is adopted for all generations of LCD panel production lines. The launch of Gen 8.5 does not mean that
Gen 4.5, Gen 5, and Gen 6 will be phased out, and Gen 10 is not necessarily advanced than Gen 8.5. The introduction of a new production line is determined by the company’s product positioning and market demand. For example, BOE has both Gen 8.5 and Gen 4.5 production lines to meet different demands.

Panel Gen

Glass Substrate Size (mm2)

Gen 4

680×880

Gen 4.5

730×920

Gen 5

1100×1300

Gen 6

1500×1800

Gen 7

1870×2200

Gen 7.5

1950×2250

Gen 8.5

2200×2500

Gen 10

2880×3130


Q: What are the differences between LED and LCD TVs?

A: An LCD TV adopts a Thin Film Transistor Liquid Crystal Display (TFT-LCD) screen. Since the LCD itself does not emit light, it needs to rely on
Cold Cathode Fluorescent Lamp (CCFL) or Light Emitting Diode (LED) as backlight. The LED TVs we can see on the market are not actually LED display products but LCD TVs with LED backlight.
    An LCD TV with LED backlight is better than a conventional LCD TV with CCFL backlight in that it displays colors more true to life, uses less
electricity, adapts well to different environments, and is mercury free.

Q: Will OLED be replaced by TFT-LCD?

A: TFT-LCD stands for Thin Film Transistor Liquid Crystal Display. OLED, or Organic Light-Emitting Diode, is the component of a new display that has captured much attention for its strengths such as active light emitting, fast response, ultra thinness, and flexibility.
    In fact, both TFT-LCD and OLED fall into the category of semiconductor display technology. They have a lot in common and are closely related. The key OLED backplane still needs to be driven by TFT and the manufacturing process of OLED displays share most of the equipment and
technology for TFT matrix and module processes. Current TFT production lines, if partially renovated coupled with new equipment, can be used to develop and produce OLED products in the future so OLED can be considered as the continuation of the TFT technology. OLED is not substitute
for TFT-LCD. They coexist but are applied to different ranges of products.

Q: What do 4K and 8K refer to? What do UHD, QUHD, and FHD mean?

Abbreviation

FHD

UHD

QUHD

Full Name

Full

High

Definition

Ultra

High

Definition

     Quad Ultra

High

  Definition

Resolution

1080p

     (1920×1080)

4K×2K

(3840×2160)

8K×4K

(7680×4320)


A: In digital technology, calculations are done in binary and the number of pixels is used to describe the size of digital images. Since the quantity of pixels is very large, it is usually expressed in K, or kilo.
    Full High Definition (FHD) displays are the mainstream of display products on the market. Such displays have a resolution of 1920×1080, which
is better known as “1080p”.
    UHD stands for “Ultra High Definition” and QUHD for “Quad Ultra High Definition”. UHD means a resolution of 3840×2160, four times that of a
FHD display, Now UHD is the latest selling point for manufacturers and is widely applied to TVs and other display products. QUHD means a
resolution of 7680×4320, four times that of a 4K×2K display and sixteen times that of a mainstream FHD TV display.
    UHD displays can be applied to a wide range of fields, including broadcasting centers for large sport events, concerts and conferences, top
art exhibition halls, telemedicine, security monitoring, etc. They are also finding their way into homes following software and hardware upgrades.
    Take BOE’s 8K QUHD display as an example. It is the world’s largest 8K×4K display and adopts BOE’s proprietary ADSDS wide viewing angle
technology. As for display effect, it shows images finely and colors as good as they originally are. It covers the whole field of vision of human eyes so that the viewers will have an incomparable sense of involvement.

Q: What is ULED?

A: ULED stands for “Ultra Light-Emitting Diode”. Since an LED TV does not actually have an LED display but an LCD display with LED backlight,
ULED is the optimized backlight part in an LCD display with LED backlight, based on additional circuitry and algorithm.
    To put it simple, two factors are key to the optimization. One is to divide backlight into blocks; the other is to enhance the maximum brightness of each block. For example, if we divide a screen into 240 blocks and each block’s backlight brightness can be controlled separately, the colors shown on the screen will look brighter than those on an ordinary LED display. Besides, the brightness of each block can be as great as 550 nits so the contrast can be up to 1,000,000:1. Therefore, the essential feature of ULED is optimized backlight.
    ULED displays are characterized by wide color gamut, great contrast, fast response, bright and natural colors, better brightness and power, and no image shimmering. However, it is just an optimization technology rather than a groundbreaking new technology. It is not like the new OLED
technology. The two are not at the same level.

Q: What is QLED?

A: QLED stands for “Quantum Dot Light-Emitting Diode”. It has quantum film and its light-emitting layer is made of quantum dots instead of
phosphor as in conventional LED.
    A quantum dot is a nanocrystal made of semiconductor materials. When exposed to visible light or electric currents, it emits bright visible light of pure color spectrum. Quantum dots made of different materials emit different light. According to the range of fluorescence absorption, they can be divided into red-light-emitting, blue-light-emitting, and green-light-emitting quantum dots.
    For QLED, blue light is used to excite quantum dots so that they emit red and green light; the efficiency of light emitting can be enhanced by 30-40%. QLED displays have such strengths as pure colors, great stability, less use of electricity, low cost, and wide application, but there are also
problems, including manufacturing process yet to mature, life cycle yet to be prolonged, and environmental impacts.