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lcd module specification model: LG128643-LMDWH6V table of contents cover & contents 1 basic specifications 2 absolute maximum ratings 3 electrical characteristics 4 operating principles & methodes 7 display control instructions 10 display data ram address map 13 connection with 8051 family mpu 14 electro optical characteristics 15 dimensional outline 17 lcd module numbering system 18 precautions for use of lcd module 19 free datasheet http:///
LG128643-LMDWH6V - 2 - 1. basic specifications 1.1 features display format : 128 x 64 dots lcd mode : fstn blue negative transmissive driving method : 1/64 duty, 1/9 bias viewing direction : 6:00 backlight : led, white color outline dimension : 93.0(w) x 70.0(h) x 13.5(t) mm viewing area : 72.0(w) x 39.0(h) mm dot size : 0.48 x 0.48 mm dot pitch : 0.52 x 0.52 mm weight : 75 g controller : s6b0108 (ks0108b) 1.2 block diagram 64 seg s6b0107 db7 ledk leda rs, r/w, e, /rst dd o ss out v v v v db0 power circuit or eqv. 64 seg s6b0108 or eqv. led backlight to lsi s6b0108 or eqv. 64 com lcd panel 128 x 64 dots cs1 cs2 free datasheet http:///
LG128643-LMDWH6V - 3 - 1.3 terminal functions pin no. symbol level function 1 v ss 0v ground 2 v dd +5v power supply for logic 3 v o - operating voltage for lcd (contrast adjusting) 4 rs h/l register selection h: display data l: instruction code 5 r/w h/l read/write selection h: read operation l: write operation 6 e h, h l enable signal. read data when e is h , write data at the falling edge of e 7 db0 h/l data bit0 8 db1 h/l data bit1 9 db2 h/l data bit2 10 db3 h/l data bit3 11 db4 h/l data bit4 12 db5 h/l data bit5 13 db6 h/l data bit6 14 db7 h/l data bit7 15 cs1 h chip selection for ic1, active h 16 cs2 h chip selection for ic2, active h 17 /rst l reset signal, active l 18 v out -10v output voltage for lcd driving 19 leda +5v power supply for led backlight 20 ledk 0v power supply for led backlight 2. absolute maximum ratings item symbol min. max. unit supply voltage(logic) v dd -v ss -0.3 7.0 v supply voltage(lcd) v dd -v o -0.3 19.0 v input voltage v i -0.3 v dd +0.3 v operating temp. topr -20 70 storage temp. tstg -30 80 free datasheet http:///
LG128643-LMDWH6V - 4 - 3. electrical characteristics 3.1 dc characteristics (v dd =5.0v 10%, ta=25) item symbol condition min. typ. max. unit supply voltage (logic) v dd 4.5 5.0 5.5 v supply voltage (lcd driving) v dd -v o -- 12.2 -- v input high voltage v ih 2.0 -- v dd v input low voltage v il 0 -- 0.8 v output high voltage v oh i oh=-0.2ma 2.4 -- v dd v output low voltage v ol i ol=1.6ma 0 -- 0.4 v supply current (logic) i dd v dd =5.0v -- 6.0 8.0 ma 3.2 interface timing chart (v dd =5.0v 10%, ta=25) characteristic symbol min. typ. max. unit e cycle t c 1000 -- -- ns e high level width t wh 450 -- -- ns e low level width t wl 450 -- -- ns e rise time t r -- -- 25 ns e fall time t f -- -- 25 ns address set-up time t asu 140 -- -- ns address hold time t ah 10 -- -- ns data set-up time t dsu 200 -- -- ns data delay time t d -- -- 320 ns data hold time(write) t dhw 10 -- -- ns data hold time(read) t dhr 10 -- -- ns free datasheet http:///
LG128643-LMDWH6V - 5 - t t t t t t t t t t e r/w cs1, cs2 db0~db7 rs t fig.1 mpu write timing db0~db7 cs1, cs2 rs r/w e t fig.2 mpu read timing t t t t t t t t t t c wl wh r f asu ah asu ah dsu dsu c wl r wh f asu ah asu ah d dhr free datasheet http:///
LG128643-LMDWH6V - 6 - 3.3 led backlight characteristics (ta=25 ) item symbol condition min. typ. max. unit forward voltage v f 2.9 3.1 3.3 v forward current if vf=3.1v -- 60 -- ma color white 3.4 power supply +5v +5v vr 20 k w v o l c m ledk leda out v v ss v dd note: 5v voltage for the led backlight should be supplied to pin19 (leda) and pin20 (ledk) terminal of the interface, it should not be supplied to the anode/cathode terminal of the led backlight directly. free datasheet http:///
LG128643-LMDWH6V - 7 - 4. operating principles & methodes 4.1 i/o buffer input buffer controls the status between the enable and display of chip. unless the ic (selected by cs1, cs2) is in active mode, input or output of data and instruction does not execute. therefore internal state is maintained. but /rst can operate regardless the level of cs1 or cs2. 4.2 register both input register and output register are provided to interface to mpu of which the speed is different from that of internal operation. the selections of these registers depend on the combination of r/w and rs signals. rs r/w function l instruction l h status read (busy check) l data write (from input register to display data ram) h h data read (from display data ram to output register) 4.2.1 input register input register stores the data temporarily before writing it into display data ram. when the ic is in active mode, r/w and rs select the input register. the data from mpu is written into input register, then into display data ram. data is latched at falling edge of the e signal and then written into the display data ram automatically by internal operation. 4.2.2 output register output register stores the data temporarily which is read from display data ram when the ic is in active mode and r/w and rs=h, stored data in display data ram is latched in output register. when the ic is in active mode and r/w=h, rs=l, status data (busy check) can be read out. to read the contents of display data ram, twice access of read instruction is needed. in first access, data in display data ram is latched into output register. in second access, mpu can read data that is latched in output register. that is, to read the data in display data ram, it needs dummy read. but status read does not need dummy read. the following shows the mpu read timing. free datasheet http:///
LG128643-LMDWH6V - 8 - e r/w rs output address register db0~db7 n n+1 n+2 data at address n data at address n+1 busy check address n write read data (dumy) busy check read data address n busy check read data address n+1 busy check mpu read timing 4.3 reset the system can be initialized by setting /rst terminal at low level when turning power on. when /rst becomes low, following procedure is occurred. 1. display off 2. display start line register is set by 0. (z-address 0) while /rst is low level, no instruction except status read can be accepted. reset status appears at db4 of status byte, after db4 becomes l , any instruction can be accepted. the conditions of power supply at initial power up are shown below. item symbol min. typ. max. unit reset time t rs 1.0 -- -- s rise time t r -- -- 200 ns t t rs r 0.3v 0.7v v dd dd dd /rst 4.5v 4.4 busy flag busy flag indicates the system is now internally operating or not. when busy flag is h , the system is in internal operation. when busy flag is l , the system can accept data or instruction. busy flag is read out on db7 by the status read instruction. free datasheet http:///
LG128643-LMDWH6V - 9 - 4.5 display on/off flip-flop the display on/off flip-flop makes on/off the liquid crystal display. when flip-flop is reset (logical low), selective voltage or non selective voltage appears on segment output terminals. when flip-flop is set (logical high), non selective voltage appears on segment output terminals regardless of display ram data. the display on/off flip-flop can change status by instruction. the display data at all segments disappear while /rst is low. the status of the flip-flop is output on db5 by status read instruction. 4.6 x page register x page register designates page of the internal display data ram. count function is not available. an address is set by instruction. 4.7 y address counter y address counter designates address of the internal display data ram. an address is set by instruction and is increased by 1 automatically by read or write operations of display data. 4.8 display data ram display data ram stores a display data for liquid crystal display. 1 bit data of this ram corresponds to light on (data=1) or light off (data=0) of 1 dot on the display panel. 4.9 display start line register the register specifies a line in display data ram that corresponds to the top line of lcd panel, when displaying contents in display data ram on the lcd panel. bit data (db<0:5>) of the display start line information is written into this register by display start line set instruction. it is used for scrolling of the liquid crystal display screen. free datasheet http:///
LG128643-LMDWH6V - 10 - 5. display control instructions the display control instructions control the internal state of the ks0108b. instruction is received from mpu to ks0108b for the display control. the following table shows various instructions. instruction rs r/w db7 db6 db5 db4 db3 db2 db1 db0 function display on/off 0 0 0 0 1 1 1 1 1 0/1 controls the display on or off. internal status and display ram data are not affected. set address (y address) 0 0 0 1 y address (0-63) sets the y address at the y address counter. set page (x address) 0 0 1 0 1 1 1 page (0-7) sets the x address at the x address register. display start line (z address) 0 0 1 1 display start line (0-63) indicates the display data ram displayed at the top of the screen. status read 0 1 b u s y 0 o n / o f f r e s e t 0 0 0 0 reads status. busy 0: ready 1: in internal operation on/off 0: display on 1: display off reset 0: normal 1: reset write display data 1 0 display data writes data (db0~db7) into display data ram. after writing instruction, y address is increased by 1 automatically. read display data 1 1 display data reads data (db0~db7) from display data ram to the data bus. free datasheet http:///
LG128643-LMDWH6V - 11 - 5.1 display on/off rs r/w db7 db6 db5 db4 db3 db2 db1 db0 0 0 0 0 1 1 1 1 1 d the display data appears when d is 1 and disappears when d is 0. though the data is not on the screen with d=0, it remains in the display data ram. therefore, you can make it appear by changing d=0 into d=1. 5.2 set address (y address) rs r/w db7 db6 db5 db4 db3 db2 db1 db0 0 0 0 1 ac5 ac4 ac3 ac2 ac1 ac0 y address (ac0~ac5) of the display data ram is set in the y address counter. an address is set by instruction and increased by 1 automatically by read or write operations of display data. 5.3 set page (x address) rs r/w db7 db6 db5 db4 db3 db2 db1 db0 0 0 1 0 1 1 1 ac2 ac1 ac0 x address (ac0-ac2) of the display data ram is set in the x address register. writing or reading to or from mpu is executed in this specified page until the next page is set. 5.4 display start line (z address) rs r/w db7 db6 db5 db4 db3 db2 db1 db0 0 0 1 1 ac5 ac4 ac3 ac2 ac1 ac0 z address (ac0~ac5) of the display data ram is set in the display start line register and displayed at the top of the screen. free datasheet http:///
LG128643-LMDWH6V - 12 - 5.5 status read rs r/w db7 db6 db5 db4 db3 db2 db1 db0 0 1 busy 0 on/off reset 0 0 0 0 ? busy when busy is 1, the chip is executing internal operation and no instructions are accepted. when busy is 0, the chip is ready to accept any instructions. ? on/off when on/off is 1, the display is off. when on/off is 0, the display is on. ? reset when reset is 1, the system is being initialized. in this condition, no instructions except status read can be accepted. when reset is 0, initializing has finished and the system is in the normal operation condition. 5.6 write display data rs r/w db7 db6 db5 db4 db3 db2 db1 db0 1 0 d7 d6 d5 d4 d3 d2 d1 d0 write data (d0~d7) into the display data ram. after writing instruction, y address is increased by 1 automatically. 5.7 read display data rs r/w db7 db6 db5 db4 db3 db2 db1 db0 1 1 d7 d6 d5 d4 d3 d2 d1 d0 read data (d0~d7) from the display data ram. after reading instruction, y address is increased by 1 automatically. one time of dummy read must be required after column address setting. free datasheet http:///
LG128643-LMDWH6V - 13 - 6. display data ram address map page address display data 1st ks0108b 2nd ks0108b line address common d0 c0 com1 d1 c1 com2 d2 c2 com3 d3 c3 com4 d4 c4 com5 d5 c5 com6 d6 c6 com7 b8 d7 c7 com8 d0 c8 com9 d1 c9 com10 d2 ca com11 d3 cb com12 d4 cc com13 d5 cd com14 d6 ce com15 b9 d7 cf com16 d0 d0 com17 d1 d1 com18 d2 d2 com19 d3 d3 com20 d4 d4 com21 d5 d5 com22 d6 d6 com23 ba d7 d7 com24 d0 d8 com25 d1 d9 com26 d2 da com27 d3 db com28 d4 dc com29 d5 dd com30 d6 de com31 bb d7 df com32 d0 e0 com33 d1 e1 com34 d2 e2 com35 d3 e3 com36 d4 e4 com37 d5 e5 com38 d6 e6 com39 bc d7 e7 com40 d0 e8 com41 d1 e9 com42 d2 ea com43 d3 eb com44 d4 ec com45 d5 ed com46 d6 ee com47 bd d7 ef com48 d0 f0 com49 d1 f1 com50 d2 f2 com51 d3 f3 com52 d4 f4 com53 d5 f5 com54 d6 f6 com55 be d7 f7 com56 d0 f8 com57 d1 f9 com58 d2 fa com59 d3 fb com60 d4 fc com61 d5 fd com62 d6 fe com63 bf d7 ff com64 column address 40 41 42 -- 7d 7e 7f 40 41 42 -- 7d 7e 7f segment s e g 1 s e g 2 s e g 3 -- s e g 6 2 s e g 6 3 s e g 6 4 s e g 6 5 s e g 6 6 s e g 6 7 -- s e g 1 2 6 s e g 1 2 7 s e g 1 2 8 free datasheet http:///
LG128643-LMDWH6V - 14 - 7. connection with 8051 family mpu 8051 p0.0~p0.7 p2.5~p2.7 74ls373 e db0~db7 74ls138 /rd /wr 3 8 8 a3 rs r/w y0 p1.0~p1.7 8051 8 r/w rs db0~db7 e p3.0 p3.1 p3.2 b. application circuit 2 a2 a1 a0 p3.3 p3.4 rst /rst rst /rst a. application circuit 1 lg128643 lg128643 cs1 cs2 cs1 cs2 free datasheet http:///
LG128643-LMDWH6V - 15 - 8. electro optical characteristics (ta=25 ) item symbol condition min. typ. max. unit note view angle 2- 1 k 3 2 , q =0 =0 , q =0 =0 , q =0 ? =0 , q =0 note1: definition of viewing angle , f 1 f 2 q x x' y( =180 f q ) =0 q y'( ) =0 z( ) top bottom , f =+90 , f =-90 note2: definition of viewing angle range: 1, 2 f1 viewing angle f2 2.0 k free datasheet http:///
LG128643-LMDWH6V - 16 - note3: definition of contrast k b1 b2 brightness driving voltage contrast= brightness of selected dot (b2) brightness of non-selected dot (b1) note4: definition of response time b r i g h t n e s s tr 1 0 0 % 9 0 % 1 0 % tf non-selective non-selective state state selective state time free datasheet http:///
LG128643-LMDWH6V - 17 - 9. dimensional outline free datasheet http:///
LG128643-LMDWH6V - 18 - 10. lcd module numbering system l g 128 64 3 D l m d w h 6 v D xxx (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) (13) (1) brand (2) module type c - character module g - graphic module (3) display format character module : number of characters per line, two digits xx graphic module : number of columns, tow or three digits xx or xxx (4) display format character module : number of lines, one digit x graphic module : number of rows, two or three digits xx or xxx (5) development number : one digit x ( 1~9, a~z ) (6) lcd mode t - tn positive, gray n - tn negative, blue s - stn positive, yellow-green g - stn positive, gray b - stn negative, blue f - fstn positive, white k - fstn negative, black l - fstn negative, blue (7) polarizer mode r - reflective f - transflective m - transmissive (8) backlight type n - without backlight l - array led d - edge light led e - el c - ccfl (9) backlight color y - yellow-green b - blue w - white g - green a - amber r - red m - multi color nil C without backlight (10) operating temperature range s - standard temperature ( 0 ~ +50 o c ) h - extended temperature ( -20 ~ +70 o c ) (11) viewing direction 3 - 3:00 6 C 6:00 9 C 9:00 u C 12:00 (12) dc-dc converter n or nil C without dc-dc converter v C built in dc-dc converter (13) version code 0~zzz C version code free datasheet http:///
LG128643-LMDWH6V - 19 - 11. precautions for use of lcd module 11.1 handing precautions 1) the display panel is made of glass. do not subject it to a mechanical shock by dropping it from a high place, etc. 2) if the display panel is damaged and the liquid crystal substance inside it leaks out, be sure not to get any in your mouth. if the substance comes into contact with your skin or clothes, promptly wash it off using soap and water. 3) do not apply excessive force on the surface of display or the adjoining areas of lcd module since this may cause the color tone to vary. 4) the polarizer covering the display surface of the lcd module is soft and easily scratched. handle this polarizer carefully. 5) if the display surface of lcd module becomes contaminated, blow on the surface and gently wipe it with a soft dry cloth. if it is heavily contaminated, moisten cloth with one of the following solvents. isopropyl alcohol ethyl alcohol solvents other than those mentioned above may damage the polarizer. especially, do not use the following: water ketone aromatic solvents 6) when mounting the lcd module make sure that it is free of twisting, warping, and distortion. distortion has great influence upon display quality. also keep the stiffness enough regarding the outer case. 7) be sure to avoid any solvent such as flux for soldering never stick to heat-seal. such solvent on heat-seal may cause connection problem of heat-seal and tab. 8) do not forcibly pull or bend the tab i/o terminals. 9) do not attempt to disassemble or process the lcd module. 10) nc terminal should be open. do not connect anything. 11) if the logic circuit power is off, do not apply the input signals. 12) to prevent destruction of the elements by static electricity, be careful to maintain an optimum work environment. be sure to ground the body when handling the lcd module. tools required for assembly, such as soldering irons, must be properly grounded. to reduce the amount of static electricity generated, do not conduct assembly and other work under dry conditions. the lcd module is coated with a film to protect the display surface. exercise care when peeling off this protective film since static electricity may be generated. 11.2 storage precautions free datasheet http:///
LG128643-LMDWH6V - 20 - 1) when storing the lcd module, avoid exposure to direct sunlight or to the light of fluorescent lamps and high temperature/high humidity. whenever possible, the lcd module should be stored in the same conditions in which they were shipped from our company. 2) exercise care to minimize corrosion of the electrodes. corrosion of the electrodes is accelerated by water droplets or a current flow in a high humidity environment. 11.3 design precautions 1) the absolute maximum ratings represent the rated value beyond which lcd module can not exceed. when the lcd modules are used in excess of this rated value, their operating characteristics may be adversely affected. 2) to prevent the occurrence of erroneous operation caused by noise, attention must be paid to satisfy vil, vih specification values, including taking the precaution of using signal cables that are short. 3) the liquid crystal display exhibits temperature dependency characteristics. since recognition of the display becomes difficult when the lcd is used outside its designated operating temperature range, be sure to use the lcd within this range. also, keep in mind that the lcd driving voltage levels necessary for clear displays will vary according to temperature. 4) sufficiently notice the mutual noise interference occurred by peripheral devices. 5) to cope with emi, take measures basically on outputting side. 6) if dc is impressed on the liquid crystal display panel, display definition is rapidly deteriorated by the electrochemical reaction that occurs inside the liquid crystal display panel. to eliminate the opportunity of dc impressing, be sure to maintain the ac characteristics of the input signals sent to the lcd module. 11.4 others 1) liquid crystals solidify under low temperatures (below the storage temperature range) leading to defective orientation or the generation of air bubbles (black or white). air bubbles may also be generated if the lcd module is subjected to a strong shock at a low temperature. 2) if the lcd modules have been operating for a long time showing the same display patterns, the display patterns may remain on the screen as ghost images and a slight contrast irregularity may also appear. a normal operating status can be regained by suspending use for some time. it should be noted that this phenomenon does not adversely affect performance reliability. 3) to minimize the performance degradation of the lcd modules resulting from destruction caused by static electricity, etc., exercise care to avoid touching the following sections when handling the module: terminal electrode sections. part of pattern wiring on tab, etc. free datasheet http:///

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