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website: www.displaytech.com.hk lcd m odule p roduct specification product: DT028ATFT & DT028ATFT - ts 2.8 '' tft display module ( 2 4 0 rgbx 320 dots) contents in this document are subject to change without notice. no part of this document may be reproduced or transmitted in any form or by any means, electronic or mechanical, for any purpose, without the express written permission of displaytech ltd. 3 november 2011 .
displaytech ltd lcd module DT028ATFT / DT028ATFT - ts version: 2. 1 1 1. revision record version changes date 1.0 initial revision 26 april 2011 2.0 add ed details of ts version in pages 3, 5, 7, & 8 9 june 2011 2.1 changed the temperature range of ts version 3 november 2011
displaytech ltd lcd module DT028ATFT / DT028ATFT - ts version: 2. 1 2 table of content 1. revision record ................................ ................................ .......... 1 2. introduction ................................ ................................ .......................... 3 3. general s pecifications ................................ ................................ .......... 3 4. mechanical drawing ................................ ................................ ............. 4 5. interface description ................................ ................................ ............ 6 6. absolute maximum ratings ................................ ................................ 8 7. electrical characteristics ................................ ................................ ..... 8 8. display controller /power supply timing ................................ ......... 8 9. backlight specification ................................ ................................ ......... 9 10. optical characteristics ................................ ................................ ......... 9 11. safety precaution ................................ ................................ ................ 12
displaytech ltd lcd module DT028ATFT / DT028ATFT - ts version: 2. 1 3 2. introduction DT028ATFT and DT028ATFT - ts is a display module that contains a tft display with a 320 * 2 4 0 rgb resolution. the driver used for this project is the ilitek ili9341 or compatible and can display 262 k colors. the driver is mounted on the g lass and the interconnection via fpc including components to drive the display module. 3. general s pecifications item specification unit lcd mode transmissive --- resolution 2 4 0(rgb) line 320 line diagonal size 2.8 inch overall size 50.00 mm 69.20 m m active area 43.20 m m 57.60 m m optimum viewing direction 6 o clock --- driver ic ili9341 --- interface type mcu parallel / rgb (1) --- colours 262k --- operation temperature range - 20~70 c storage temperature range - 30~80 c remarks: (1) serial inter face is available, but not recommendable, as the speed of it is very slow. (2) recommended mating connector: hirose fh19sc - 45s - 0.5sh , fh12s - 45s - 0.5sh ; or molex 0512964593 , 0512964594 ; or equivalent (3) color tune may be changed slightly by temperature and drivin g voltage. (4) rohs compliant. component life cycle 1) storage life : min. 1 year 2) operation life ( *1 ): min. 4 3 x 10 3 h (2 4 h r/d ay x 7days / week x 52weeks/year x 5years) (not include backlight) 3) storage and operation life times are defined for a temperat ure of +25c notes: *1. operation life ends when one of the listed faults occurs: ? the on/off response - times reach 1.5 times of the max. value specified for a new display ? the contrast is reduced to 0.5 of the original contrast value ? loss of function ? the nu mber of cosmetic defects exceeds the maximum defined
displaytech ltd lcd module DT028ATFT / DT028ATFT - ts version: 2. 1 4 4. mechanical drawing DT028ATFT
displaytech ltd lcd module DT028ATFT / DT028ATFT - ts version: 2. 1 5 DT028ATFT - ts
displaytech ltd lcd module DT028ATFT / DT028ATFT - ts version: 2. 1 6 5. interface description pin no symbol i/o description 1 led a --- back light anode. 2 led k 1 --- backlight cathode k1 3 led k 2 --- backlight cathode k2 4 led k 3 --- backlight cathode k3 5 led k 4 --- backlight cathode k4 6 im0 i 7 im1 8 im2 9 im3 10 fmark o tearing effect output pin to synchronize mpu to frame writing, activated by s/w command. when this pin is not activ ated, this pin is low. if not used, open this pin. 11 vsync i frame synchronizing signal for rgb interface operation. fix to vddi or vss level when not in use. 12 hsync i line synchronizing signal for rgb interface operation. fix to vddi or vss level whe n not in use. 13 dotclk i dot clock signal for rgb interface operation. fix to vddi or vss level when not in use. 14 enable i data enable signal for rgb interface operation. fix to vddi or vss level when not in use. 1 5 ~ 32 db17~db0 i/o 18 - bit parallel bi - directional data bus for mcu system and rgb interface mode fix to vss level when not in use . please refer to the im[0:3] setting. 33 cs i chip select input pin (low enable). this pin can be permanently fixed low in mpu interface mode only. 34 w r i - 8080 - i / 8080 - ii system (wrx): serves as a write signal and writes data at the rising edge. - 4 - line system (d/cx): serves as command or parameter select. fix to vddi or vss level when not in use.
displaytech ltd lcd module DT028ATFT / DT028ATFT - ts version: 2. 1 7 pin no symbol i/o description 35 r s /scl i this pin is used to select data or command in the parallel interface or 4 - wire 8 - bit serial data interface. when rs = 1, data is selected. when rs = 0, command is selected. this pin is used serial interface clock in 3 - wire 9 - bit / 4 - wire 8 - bit serial data int erface. if not used, this pin should be connected to vddi or vss. 36 rd i 8080 - i / 8080 - ii system (rdx): serves as a read signal and mcu read data at the rising edge. fix to vddi or vss level when not in use. 37 reset i res et pin. 38 sdo o serial output signal. the data is outputted on the falling edge of the scl signal. if not used, open this pin 39 sdi i when im[3] : low, serial in/out signal. when im[3] : high, serial input signal. the data is applied on the rising edge of the scl signal. if not used , fix this pin at vddi or vss. 40 vcc --- power supply 2.8v 41 gnd --- power ground 0v 4 2 nc / yd - -- no connection (DT028ATFT) / yd of touch screen (DT028ATFT - ts) 43 nc / xr - -- no connection (DT028ATFT) / xr of touch screen (DT028ATFT - ts) 44 nc / yu - -- no connection (DT028ATFT) / yu of touch screen (DT028ATFT - ts) 45 nc / xl --- no connection (DT028ATFT) / xl of touch screen (DT028ATFT - ts)
displaytech ltd lcd module DT028ATFT / DT028ATFT - ts version: 2. 1 8 6. absolute maximum ratings (ta=25 ? ) item symbol min. max. unit power s upply voltage v cc - 0.3 + 4.6 v l ogic signal input/output voltage v cc - 0.3 + 4.6 v operating temperature t op - 20 + 7 0 ? storage temperature t st - 3 0 + 8 0 ? note: when temperature is below 0 ? , the response time of liquid crystal (lc) will be slower and the color o f panel will be darker. if module driving condition exceeds the absolute maximum ratings , permanent damaged may be resulted. if module is driven within the absolute maximum ratings but exceeded the dc characteristics, mal - function may be resulted. vdd /vcc > vs s 7. electrical cha racteristics dc characteristics (vss=0v, ta=25 ? ) item symbol condition min. typ. max. unit power supply v cc / v dd 2.5 2.8 3.3 v input voltage ? v ih --- 0. 7 vc c --- v cc v input voltage l v il --- vss --- 0.3 v cc v output voltage h v oh iol= - 1.0ma 0.8 v cc --- v cc v output voltage l v ol iol=1.0ma vss --- 0.2 v cc v 8. d isplay controller /power supply timing see display controller specification: ilitek ili9341
displaytech ltd lcd module DT028ATFT / DT028ATFT - ts version: 2. 1 9 9. backlight specification (vcc=2.8v, vss=0v, ta=25 ? ) item symbol condition min typ ma x unit note supply voltage vf if=80ma 2.9 3.2 3.5 v 1 forward current if --- --- 80 ma 2 u niformity bp if=80ma 80 --- --- % color coordination x 0.270 --- 0.315 --- y 0.270 --- 0.315 --- led circuit diagram: constant current if=4x20ma=80ma ; vf=3.2v(typ) note: 1) the led s driver mode needs to be constant current mode. 2) permanent damage to the device may occur if maximum values are exceede d. functional operation should be restricted to the conditions described under normal operating conditions. 10. optical characteristics (vcc=2.8v, vss=0v, ta=25 ? ) item symbol condition min typ max unit note brightness bp =0 =0 180 220 --- c d/m 2 1 u niformity bp 80 --- --- % 1, 2 viewing angle 1 ( =90 or 270) cr 10 - 70 ~ 50 deg 3 2 ( =0 or 180) - 7 0 ~ 70 contrast ratio cr =0 =0 400 500 --- --- 4 response time tr --- 25 30 m s 5 tf cie (x,y) chroma ti city white x =0 =0 0.230 0.280 0.330 --- 1, 6 y 0.248 0.298 0.348 red x 0.580 0.630 0.680 y 0.279 0.329 0.379 gre en x 0.288 0.338 0.388 y 0.557 0.607 0.657 blue x 0.093 0.143 0.193 y 0.025 0.075 0.125 ntsc ratio s --- 65 --- %
displaytech ltd lcd module DT028ATFT / DT028ATFT - ts version: 2. 1 10 note 1: the data are measured after leds are turned on for 5 minutes. lcm displays full white. the brightness is th e average value of 9 measured spots. measurement equipment pr - 705 ( 8mm) measuring condition: - measuring surroundings: dark room. - measuring temperature: ta=25c. - adjust operating voltage to get optimum contrast at the center of the display. measured value at the center point of lcd panel after more than 5 m inutes while backlight turning on. note 2: the luminance uniformity is calculated by using following formula. bp = bp (min.) / bp (max.) 100 (%) bp (max.) = maximum brightness in 9 measured spots bp (min.) = minimum brightne ss in 9 measured spots. measurement equipment pr - 705 ( 8mm) note 3: the definition of viewing angle: refer to the graph below marked by and w/6 w/3 w/3 l/6 l/3 l/3
displaytech ltd lcd module DT028ATFT / DT028ATFT - ts version: 2. 1 11 note 4: the definition of contrast ratio (test lcm using pr - 705): contrast ratio (cr) = luminance when lcd is at white state luminance when lcd is at blac k state (contrast ratio is measured in optimum common electrode voltage) note 5: definition of response time. (test lcd using dms501): the output signals of photo detector are measured when the input signals are changed from black to ?hite (fallin g time) and from white to black (rising time), respectively. the response time is defined as the time interval between the 10% and 90% of amplitudes. refer to figure as below. the definition of response time note 6: definition of color of cie coord inate and ntsc ratio. color gamut: s = area of rgb triangle x 100% area of ntsc triangle
displaytech ltd lcd module DT028ATFT / DT028ATFT - ts version: 2. 1 12 11. s afety p recaution handling precautions: this device is susceptible to electro - static discharge (esd) damage. observe anti - st atic precautions. power supply precautions: identify and, at all times, observe absolute maximum ratings for both logic and lc drivers. note that there is some variance between models. prevent the application of reverse polarity to vcc and gnd, h owever briefly. use a clean power source free from transients. power up conditions are occasionally jolting and may exceed the maximum ratings of the modules. the vcc power of the module should also supply the power to all devices that may access the di splay. don t allow the data bus to be driven when the logic supply to the module is turned off. operating precautions: do not plug or unplug the module when the system is powered up. minimize the cable length between the module and host mpu. operate the module within the limits of the modules temperature specifications. mechanical/environmental precautions: improper soldering is the major cause of module difficulty. use of flux cleaner is not recommended as they may seep under the elastomeric connection and cause display failure. mount the module so that it is free from torque and mechanical stress. surface of the lcd panel should not be touched or scratched. the display front surface is an easily scratched, plastic polarizer. avoid contact and clean on ly when necessary with soft, absorbent cotton dampened with petroleum benzene. always employ anti - static procedure while handling the module. prevent moisture build - up upon the module and observe the environmental constraints for storage temperature and hu midity. do not store in direct sunlight if leakage of the liquid crystal material should occur, avoid contact with this material, particularly ingestion. if the body or clothing becomes contaminated by the liquid crystal material, wash thoroughly with wa ter and soap
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