Sunlight readable tft & transflective tft

How to choose Sunlight readable tft : Transflective TFT vs. High brightness tft

On outdoor display domain, TFT LCD display with its lower power consumption than other displays, long life time than oled display, full display colors than traditional monochrome lcd display, the high brightness TFT and transflective tft lcd display module would be a good solutions for outdoor display.

In this article, we make a full comparison about the high brightness tft lcd and transflective tft lcd display module in the technical parameters, display performance, and cost evaluation. After read this article, you would get a deep comprehension about sunlight readable tft, and how to select sunlight readable tft lcd display, to choose a most suitable transflective tft lcd or high brightness tft lcd for your outdoor display.

1) Sunlight readable tft lcd module - High brightness tft 3.5”:

Sizes: 3.5 inch

Display mode: Transmissive TFT LCD

Viewing direction:

Resolution: 320RGBx240 pixels

Outline dimensions:

TFT driver IC: HX8238D

Interface: RGB interface

Control board: without

Brightness: 1000 cd/m2

Frame through hole: without

Touch screen: without

Sunlight readable tft lcd

Item

Symbol

Min

Typ

Max

Unit

Supply Voltage For Logic

Vcc

3.1

3.3

3.5

V

LCD digital operation current

ICC

10

-

mA

Backlight forward current

If

20

--

mA

Backlight voltage

Vf

--

18.0

V

From the parameters, we could know it is a sunlight readable TFT LCD module with high brightness of 1000 cd/m2 (typical value). it is a color TFT LCD with QVGA 320x240 resolution, diagonal size 3.5 inch. This TFT model is built in with HX8238D driver IC. It  supports 24-bit RGB interface; this version is without Resistive Touch Screen (RTP) and Projected Capacitive Touch Screen (CTP). It is an alternative item to replace Winstar or CPT (Chunghwa Picture Tubes Ltd) sunlight readable TFT display panel

The supply voltage for logic (VCC) of this 3.5 inch sunlight readable tft lcd is from 3.1V to 3.5V, typical value 3.3V. It is featured with Glare surface panel, View Direction 6 o'clock, Gray scale inversion 12 o'clock, and aspect ratio is 4:3. It can be operating at temperatures from -20℃ to +70 ℃ and storage temperatures from -30 to +80 ℃. Maclght sunlight readable TFT LCD is perfect choices for outdoor industrial measuring equipment and instruments, testing equipment, measuring tools, outdoor advertising display etc.

The 3.5” 1000 nits high bright tft lcd display effect under sunlight:

If customers would need sunlight readable displays solution for the applications, Maclight’s high Brightness TFT Display solution is as a good solution. Maclight high brightness TFT LCD panel is featured with brightness up from 800 nits to 1000 nits.

Maclight sunlight readable tft display models are also available in resistive touch panel and capacitive touch panel, but the brightness would be affected after adding the touch panel. the brightness will be decreased if the module require touch panel on it.

Maclight Sunlight Readable LCD Modules (High Brightness TFT Display) are suitable for outdoor applications.


2) Transflective tft lcd display module- 2.2 inch

Item

Dimension

Unit

Size

2.2

inch

Dot Matrix

240 × RGB × 320(TFT)

dots

Module dimension

40.6 × 56.6 × 2.7

mm

Active area

33.84 × 45.12

mm

Dot pitch

0.141 × 0.141

mm

LCD type

Transflective mode

Reflectance

6.8%

View Direction

12 o'clock

Gray Scale Inversion Direction

6 o'clock

Aspect Ratio

16:9

TFT Driver IC

ILI9341

Interface

RGB

Backlight Type

4 LEDs, Normally White

Touch Panel

Without touch panel

Surface

Glare

Item

Symbol

Min

Typ

Max

Unit

Supply Voltage For Logic

Vcc

3.1

3.3

3.5

V

LCD digital operation current

ICC

10

-

mA

Backlight forward current

If

20

--

mA

Backlight voltage

Vf

--

12.8

V

Transflective TFT LCD displays become more and more popular because the demand of display working in bright environments and direct sunlight.

Transflective TFT-LCD modules have both “transmissive” and “reflective” modes.

Both display modes work together for enhanced performance.

In darker environments, the “transmissive” mode is dominant with emissions from the display’s backlight.

In bright environments, the “reflective” mode of the display is more dominant through reflectance from the internal mirror structure.

Transflective TFT display have a layer of reflector in front of the backlight. The incoming light is reflected on the reflector layer and used to illuminate the TFT display. So Transflective TFT LCD display modules have both "transmissive" and "reflective" characters.

Transflective tft lcd display structureTransflective TFT displays are characterized by well readability in bright ambient light and direct sunlight. While transmissive TFT lcd displays can only be operated with a backlight, transflective TFT displays feature the reflector on the color filter of TFT cell, thatin Therefore, its incoming ambient light is reflected on the TFT reflective layer and reflect to illuminate the display. As a result, the readability of the content in very bright sun light is perfect even without backlight.

Another advantage of transflective TFT LCD display modules is power savings compared to traditional “transmissive- only” displays. transflective tft lcd display combines the advantages of transmissive and transflective displays, so that the TFT displays are perfectly readable under almost any ambient light conditions. In addition, they are very energy efficient, making them ideal for battery powered devices and mobile applications.Customers using a transflective TFT-LCD can save power by reducing or turning off the display’s backlight during bright environments because the “reflective” mode is dominant.

Reflective ratio about transflective tft lcd display module:

Maclight 2.2 inch transflective tft lcd display is a true transflective tft lcd display, the reflector layer is combined the color filter of tft lcd cell, and it have a higher transflective ratio than Winstar Raystar or other brand transflective tft lcd display. Maclight 2.2 inch transflective tft lcd have 6.8% reflective ratio, while if some other transflective tft lcd module manufacturer, if they only used the transflective polarizer on the backside of transmissive tft lcd, its reflective ratio only about 2%, they are not a true transflective tft lcd, it is the lower cost solution, but the reflective ratio is too low to say it in transflective tft lcd display.

The power consumption drops to the consumption of the TFT cell, which leads to a lower power loss and a considerably reduced heat generation. Transmissive displays, on the other hand, offer good readability in direct sunlight only with a very bright backlight and a resulting higher power consumption.

But Transflective TFT-LCD modules had a “reflective” mode where color reproduction was reduced compared to “transmissive” mode displays. Maclight transflective tft lcd display improved the TFT-LCD panel structure to expand the range of color reproduction in the “reflective” mode, realizing a new transflective TFT-LCD module capable of displaying colors as vivid as the “transmissive” mode.

Transflective tft lcd dispay is perfect for outdoor, handlheld and battery powered applications we have a range of standard and customized TRUE TRANSFLECTIVE TFT Displays.

The 2.2” transflective tft lcd display effect:

3)The power consumption of transflective tft and high brightness tft lcd display

To the 3.5”high brightness tft lcd, both the TFT lcd current value is 10MA(typ.), that it is the tft lcd glass power consumption is almost similar to transflective tft and high brightness.

The big gap is from the backlight , the backlight current and voltage of 3.5” high brightness tft lcd is If=20MA,Vf=18.0V, 6 LED chips,  and the 2.2 inch transflective tft lcd backlight’s currents is If=20MA,Vf=12.8V, 4 led chips,  that is the high brightness power consumption would be higher around 50% than transflective tft lcd.

4) The cost of transflect tft lcd and high brightness tft lcd display:

After check the display effect of high brightness tft lcd display and transflective tft lcd display module, let us compare the cost of them.

The cost of 3.5” 1000 nits sunlight readable tft would be around 9~10 USD. A high brightness transmissive tft lcd in 2.2 inch, its cost around 6~7 USD. While a 2.2” transflective tft, its cost around 18 USD

So transflective tft lcd is good, but are you ready to pay more cost about your sunlight readable tft lcd display, I hope you had a answer after read this article.

Visit us for more transflective tft lcd display module and high brightness tft lcd module.

Welcome contact Maclight display for sunlight readable tft lcd display at: sales@szmaclight.com

CONTACT US

Tel: +86-755-27205930 / 36613676

Email: sales@szmaclight.com

Add: No.615,C Zone,Mingyou Purchasing center,Baoyuan Road,Baoan District,Shenzhen,China

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