Classification and characteristics of mobile phone display
Author:Wu Zilong Time:2021-10-09 17:59 Browse(27)
Mobile phone screen material: LCD screen is also known as liquid crystal display, the main screen material can be divided into TFT screen, IPS screen, Nova screen; The main application of OLED screen is AMOLED material, also known as organic light emitting diode. The main performance and advantages of these screen materials can be summarized as follows:
Mobile phone screen material: LCD screen is also known as liquid crystal display, the main screen material can be divided into TFT screen, IPS screen, Nova screen; The main application of OLED screen is AMOLED material, also known as organic light emitting diode.
the main performance and advantages of these screen materials can be summarized as follows:
LCD screen material analysis

Classification and characteristics of mobile phone display

1   TFT screen works in the way of back reflection and reflection.
each pixel on the back of LCD has a semiconductor switch, which can be directly controlled by point pulse.
TFT screen has the best effect.
with high contrast and fast response, it is the most commonly used material in LCD screen.

2   The characteristic of IPS screen is that the two electrodes are on the same surface.
the liquid crystal molecules are arranged in a horizontal way.
when encountering external force.
the liquid crystal molecular structure is solid and stable, and the whole is horizontal. Compared with the soft screen, the state is better, it will not affect the picture effect, and there is no distortion.

3   Nova screen is also known as highlight screen.
based on IPS screen, the technology of improving screen brightness is adopted to make the screen have higher brightness and pure white tone, Optimize the use experience.
it can present a clear display effect no matter in indoor or outdoor light.

analysis of OLED screen material
OLED screen material is very thin organic material coating and glass substrate.
active light-emitting technology is adopted, Compared with the traditional LCD screen, OLED screen has the characteristics of self illumination, light and thin screen, large viewing angle and good color rendering effect.
OLED screen can display pure black.
compared with the traditional LCD screen, OLED screen has the characteristics of self illumination, light and thin screen, large viewing angle and good color rendering effectEffectively save power for mobile phone; The thickness of the screen can be controlled within 1 mm, with strong anti-aging and no distortion of the screen. It can also adapt to a variety of screen styles.

in the mobile phone screen test.
the shrapnel microneedle module has excellent performance in the transmission of current and connection signal.
for example, in the current range of 1-50 A.
it can maintain stable transmission, so that the current flows in the same material body, and the over-current is stable and smooth; In the small pitch, the adaptive pitch value is between 0.15mm-0.4mm, and the performance is stable and reliable; It has an average service life of more than 20W times, and can also cope well in high frequency test.
TFT (thin film transistor) is thin film field effect transistor (TFET).
it means that every liquid crystal pixel on the LCD is driven by a thin film transistor integrated behind it, so that it can display screen information with high speed, high brightness and high contrast, TFT is an active matrix liquid crystal display.

TFT-LCD is a thin-film transistor type liquid crystal display.
that is, true color (TFT), which not only improves the reaction speed of the display, but also precisely controls the color level of the display.
TFT-LCD is characterized by good brightness, high contrast, strong sense of hierarchy, high brightness, high brightness, high contrast, and high sensitivity The color is bright.
but it also has the disadvantages of high power consumption and high cost.
ufb LCD has the characteristics of ultra-thin and high brightness.
ufb-lcd is a display specially designed for mobile phones and PDAs.
it has the characteristics of ultra-thin and high brightness, which can reduce the pixel spacing, In order to get better image quality.

the contrast of ufb LCD is twice that of STN LCDWhen the color is 65536, the brightness is the same as that of TFT display, and the power consumption is less than that of TFT display, and the price is similar to that of STN display, which can be said to combine the advantages of these two existing products.
STN is the abbreviation of super twisted nematic.
the screens of gray-scale handpieces we used in the past are all STN, and its advantage is low power consumption, with the greatest advantage of power saving, Generally speaking, the performance of STN screen for color is far worse than that of the above screen.
leaving aside the gray-scale STN, STN is mainly divided into CSTN and DSTN.
CSTN, that is, color STN transmission LCD, has good display effect under normal light and dark light lines.
but in outdoor, especially in sunlight, it is difficult to distinguish the display content, and the backlight needs power to produce lighting, Active matrix organic light emitting diodes (AMOLED) is known as the next generation display technology.
Samsung Electronics, LG and Philips all attach great importance to this new display technology.

at present, in addition to Samsung Electronics, LG and Philips taking the development of large-size AMOLED products as the main direction.
Samsung SDI In mainland China, Foshan rainbow is building a production line.
it is expected to be officially put into production within two years.

among the above manufacturers, Samsung SDI is the only one with mass production.
the size is 3-4 inches.

recently, sharp president Katayama ganxiong was asked about his views on the future development of OLED.
he said that it is impossible in five years, I think what he said may be true in the TV market, but in the small and medium-sized market, AMOLED has a good chance to coexist with TFT LCD in two years,If the yield of AMOLED can reach the same level as that of TFTLCD in the future, the replacement of TFT LCD will definitely be around the corner.

because AMOLED is not only in terms of image quality, but also in terms of image quality In terms of efficiency and cost,
congenital performance has many advantages over TFT LCD.
this is also the reason why many large international manufacturers still do not give up developing AMOLED, even though the yield is difficult to break through.
at present, they continue to invest in the development of AMOLED.
in addition to Sony, which has announced the product launch time, Toshiba, which has invested in Toshiba Panasonic display (TMD), and Matsushita, which has carried out product development independently, In addition, sharp, which announced that it was not optimistic, released Nokia N85 in August 2008 and launched Nokia N86 in the first quarter of 2009, both adopted AMOLED.

in terms of display performance, AMOLED has faster response speed, higher contrast and wider viewing angle, which are the inherent advantages of AMOLED over TFT LCD; In addition, AMOLED has the characteristics of self illumination, and does not need to use backlight, so it can be made thinner and lighter than TFT, and it can save power; Another more important feature is that AMOLED without backlight can save 3-4% of the cost of backlight module for TFT LCD.

AMOLED is indeed a very attractive product.
many international manufacturers like it very much, and even iPhone, the most popular product in the mobile phone market, is interested in AMOLED. I believe that after the yield is improved, iPhone will also consider AMOLED, AMOLED is especially suitable for mobile phones because of its power saving features. At present, the power consumption of AMOLED panel is only 60% of that of TFT LCD,There is still room for technology to decline in the future.

of course, the biggest problem of AMOLED lies in the yield.
with the current yield, the price of AMOLED panel is 50% higher than that of TFT LCD, which is absolutely a threshold for customers' willingness to adopt a large number of products. For Qijing, the yield is still in the training period, After understanding the main performance differences between AMOLED and TFT LCD.
we analyzed the main reasons for the differences through the technical level.
because AMOLED is a kind of OLED technology.
we analyzed it based on the working principle of OLED.
STN was the main device of early color screen.
at first, it could only display 256 colors, Although it can display 4096 colors or even 65536 colors after technical transformation, the general STN is still 256 colors, with the advantages of low price and low energy consumption.

TFT has good brightness.
high contrast, strong sense of hierarchy, and bright colors.
the disadvantage is that it consumes more power.
the cost is higher.

ufb is a display specially designed for mobile phones and PDAs.
it is characterized by ultra-thin, low cost and high cost, High brightness.
can display 65536 colors.
resolution can reach 128 × Ufb display screen adopts special grating design.
it can reduce the pixel spacing and obtain better image quality.
ufb combines the advantages of STN and TFT: less power consumption than TFT.
the price is similar to STN.

according to the display effect, the order is ASV, TFT, OLED, TFD, ufb, STN and CSTN.
ufb display screen has the same resolution as STN
Organic light-emitting display (OLED) refers to the phenomenon that organic semiconductor materials and light-emitting materials emit light through carrier injection and recombination driven by electric field, The electron and hole are injected into the electron and hole transport layer from the cathode and anode respectively. The electron and hole migrate to the luminescent layer through the electron and hole transport layer respectively, and meet in the luminescent layer to form excitons and excite the luminescent molecules, The latter emits visible light through radiative relaxation.
the radiative light can be observed from the ITO side.
the metal electrode film also acts as a reflective layer.
on the side of TFT liquid crystal.
we introduce the working principle of TN liquid crystal panel.
the structure of TN liquid crystal module is: the nematic liquid crystal is sandwiched between two pieces of glass.
the surface of this kind of glass is coated with a transparent and conductive layer In order to make the liquid crystal aligned along a specific direction parallel to the surface of the glass.
based on the principle that the liquid crystal can be rotated by the electric field.
the polarization direction of the liquid crystal will be parallel to the electric field direction when the voltage is applied to the two electrodes.
because the refractive index of the liquid crystal changes with the direction of the liquid crystal The result is that the polarization of light will change after it passes through TN type liquid crystal.
the light intensity can be controlled by an electric switch.
in this way, the light will be white when it is transparent and black when it is opaque.
the characters can be displayed on the screen.

obviously.
the two panels use different light sources,OLED is self luminous, while TN uses backlight, and the imaging mechanism of them is completely different.
by comparison, it is not difficult to find out.
OLED has the characteristics of thinner and lighter, active luminescence (no backlight), no visual angle problem, high definition, high brightness, fast response, low energy consumption, wide temperature range, strong seismic capacity, low cost and soft display, Many of these features are difficult to realize in TFT LCD panel.
.
the results show that TFT LCD panel has many advantages
Related topics