liquid crystal display module g 1 9 1 d user`s manual
Contents
1. 1frame tcriM AN No G191D 460E FLM T d x 192 pulses gt Sig ER eC E trums tr MH lt tcc er trei p lt gt lt frou CL1 twcLiH wou tom x Figure 10 Timing Chart 2 Timing of Signal Input Into Segment Driver CL1 Eeer SE Gs SE Ge Dep 000000000 ES OOO 9X9 3 gt lt 1 gt lt 2 gt 3 lt 1 N 20 1 to 3 Segment driver cascade number tom 1 twcL1H twcLiL CL1 me lt ts tp CL2 Ke trcL2 gt lt lt twci2H Do to Ds Figure 11 13 2 4 2 4 1 AN No G191D 460E Interface Circuit Interface with MPU signal The G191D is controlled by the MPU circuit whose interface is easily set up when the LCD controller is used The LCD controller has basic functions such as receiving information related to the display from the MPU circuit sending display timing signals and display data to the LCD module as well as other functions such as cursor display The G191D must use an LCD controllers conforming to the following For a full dot matrix LCD module Where data2. Definition of life time the time up to occurrence of any of the following Contrast reduces to 30 of the initial value Current consumption becomes three times the initial value Orientation deteriorates significantly The display malfunctions AN No G191D 460E 1 8 Dimensions Unit mm General tolerance 0 5 L 86 0 J 3 25 ic 79 5 0 3 3 25 7 0max 9 0 max 6 05 67 4 Viewing area 6 05 5 0max i 7 0max Jj 23 8 085 63 33 Active display area 8 085 E 1 2 0 2 2 0max 1 2 0 2 2 0max 31 25 a TT IT Sy Ma i A 2 i E p al al i cu ele e Sib v 2 MY Maz di vij 4 lt LJ E e gt E 2 S lt X Xo E UE 9 9 IK 1 1 dh E d EE de ae y o e ER 8 3 8 83 lt gt L L Sib d g 1 gt J i il M UN iD i H Q o GN 17 1 0 0 15 x YN 2 y D OO Oqg909 9 00999 TN VI z5 i Y L Lu oy z q 12 0 0 2 2 54x16 40 64 0 2 26 86 e 325 os SORS 3 25 G191D G191DB 1 9 82 2 1 9 li 0 3__ 0 08 e S F RE SS J l iz asd e dc pum Ze Se e Le Se Bou Figure 2 Dimensions I O terminal functio
3. 24V G191DB1P000 Figure 14 Interface Circuit With HD64646FS Features of the HD64646FS Interface with 80 series MPU possible Layered mode OR character and graphics Character reverse blinking all black all white Cursor ON OFF Blinking speed form and position are programmable 17 Character font Vertical 1 to 32 dots Horizontal 8 dots Scrolling Vertical smooth or character unit Horizontal character unit CMOS process Power supply voltage 5V 1096 AN No G191D 460E 3 LED BACKLIGHT G191DB1P000 3 1 3 2 3 3 3 4 Absolute Maximum Ratings Item Symbol Standard Unit DC forward current IF 200 mA DC reverse voltage VR 8 V Allowable dissipation Pp 950 mW Operating temp range Topr 20 to 70 C Storage temp range Tstg 30 to 80 C Forward current reduction characteristics The absolute maximum rating of the forward current varies depending on ambient temperature IF mA 20 25 70 Ta C Electrical and Optical Characteristics Ta 25 C Item Symbol Meas Condition Min Typ Max Unit Forward voltage VF Ir 100mA 3 7 4 1 4 5 V Reverse current IR Vr 8V 0 3 mA LED Backlight Connection Diagram e o gt e gt e gt LEDA Number of LED chips 20 gt e ds x gt e lt gt e LEDC Brightness panel upper side I
4. XD 10 D XD2 11 D2 XDs 12 Ds Display RAM VAo VA 5 1 Von Ra 5 6kQ e 7 Vss e DC power suppl p pply Z VR 10kQ En 13 Vic GND s Rs 5600 24V o 4 m pee eel gt 16 NC LEDA LED driving circuit l G191DB1P000 NECEM gt 17 NC LEDC l zi Figure 13 Interface Circuit With SED1330F SED1335F Features of the SED1330F 1335F nterface with 80 series or 68 series MPU possible Built in character generator ROM 160 kinds External character generator CG RAM 8 x 16 dot matrix x 64 kinds CG ROM 8x 16 dot matrix x 256 kinds Layered mode AND OR XOR preferred OR CMOS process Scrolling vertical and horizontal Power supply voltage 5V 10 SED1330F 2 7 to 5 5V SED1335F ib 3 HITACHI HD64646FS AN No G191D 460E MPU HD64646FS CS RD WR PES 2 Fono DBo DB7 3 az CUDISP 4 INH 6 CL1 Selector gt MDs MDis 8 M CH GR 10 D1 11 D2 Selector P MDo MD7 is Ss WE RAo RA4 CS MAo MA15 RS A RAM 1 Vop Ra 5 6kQ 7 Vss j MPX M EW Address Ao Aus m Ao Re 5600 14 Vo DC power supply t 15 Vss i 4 I 16 NC LEDA LED driving circuit L 17 NC LEDC GND
5. 0 mA Current consumption 1 Vo 18 9V l c fr M2 70Hz 4 5 9 0 mA Frame frequency fFLM 65 70 75 Hz 1 Display patterns checkered patterns Display data shift clock frequency fcL2 3 0MHz AN No G191D 460E 1 6 Optical Characteristics 1 6 1 G191D00P000 1 192 duty 1 12 bias fr m 70Hz Vopr Vpp Vo Item Symbol Conditions Temp Min Typ Max Unit Reference Viewing angle 02 2 0 25 C 35 Degree Notes 1 amp 2 Vopr 223 9V 02 01 40 020 Contrast C 0 25 C 2 5 3 0 Note 3 Vopr 223 9V ton 0 0 200 320 2 0 25 C toff Vopr 23 9V 130 210 Response time ms Note 4 ton 0 0 1800 2900 2 0 20 C toff Vopr 26 0V 1000 1600 Measuring instrument Canon illuminometer LC 3S 1 6 2 G191DB1P000 1 192duty 1 12bias fr m 70Hz Vopr2 Vpp Vo LED backlight ON Item Symbol Conditions Temp Min Typ Max Unit Reference dt esa m Viewing angle 02 0 25 C 30 Degree Notes 1 amp 2 Vopr 223 9V 02 01 45 0 0 Contrast C 0 25 C 1 5 2 0 Note 3 Vopr 23 9V ton 0 0 200 320 0 25 C toff Vopr 23 9V 130 210 Response time 1 H_H ms Note 4 ton 0 0 1800 2900 0 20 C toff Vopr 26 0V 1000 1600 Measuring instrument Canon illuminometer LC 3S Note 1 D
6. Three types of power supply VDD 5V VLC 24V LEDA for driving LED Transflective type A built in LED backlight color yellow green Weight Approx 80g 1 3 1 4 1 5 AN No G191D 460E Absolute Maximum Ratings excluding LED backlight Vss 0V Item Symbol Conditions Min Max Unit VDD 0 7 0 V Power supply voltage Vic Vpp 30 0 VDD V Vo Vo2VLc Vpp 30 0 VDD V Input voltage VIN 0 3 Vpp4 0 3 V Operating temperature Topr 659 RH 20 70 C Storage temperature Tstg 30 80 C lt 48 hrs 20 85 RH Storage humidity lt 1000 hrs 20 65 RH Mechanical Characteristics Item Standard Dot configuration 192x192 dots G191D00P000 86 0x95 0x7 0 ee mm G191DB1P000 86 0x95 0x9 0 Viewing area H x V mm 67 4x67 4 Active display area H x V mm 63 33x63 33 Dot dimensions H x V mm 0 3x0 3 Dot pitch H x V mm 0 33x0 33 Weight g G191D00P000 75 max G191DB1P000 100 max H Horizontal V Vertical T Thickness max Electrical Characteristics excluding LED backlignt Voo 5V15 Vss 0V Ta 20 C to 70 C Item Symbol Conditions Min Typ Max Unit Von 4 75 5 00 5 25 V Power supply voltage Vic Vpp 5V 24 5 24 0 23 5 V Vo Vo2Vic 23 0 5 0 V High ViH 0 8Vpp Von V Input voltage Low VIL 0 0 2Vpp V IDD Vop 5V Ta 25 C 5 0 10
7. ccc cccccceccescesssessensecsecseeeceeesecescesesesessesssasecaeeeseeeeeess 10 11 Postive display EA AE AAA ate och Ee BAER 1 Power supply voltage ooooooooonncnncnncnnconnnnnnnonnnnnnonononnnonconnonncnnanann nono n nono 15 16 17 18 20 Resistance division est it dE ege dk 11 Response time CR 4 Response time rise erreietan inne e eaii aaa da iaaea sa er E aae 4 REVEVSE CUPL ETT EE 18 19 Reverse voltage cccccsssssscccscccsecseccscescesessnsenssnnecaeeesseccecesesscesessnseasaaeeaseessecsecesenes 18 19 Segment drive waveform ccccceseesssesssnsecnecesceceeceeceseeensesessseasecseeeseeceecesceseeensesseaees 9 Segment drives aii d e Dena ce lets fs 8 9 13 SEIKO EPSON SED1330F 1335F essssssssssseeeeeen eene nee 14 16 selection Wave it i 6 7 Stoftage xd SEE E EE 21 Storage humrdiby se adu det ete e te itte den dits ge eee ee ee 2 Storage temperature minira n ore Eaa aa aa eT EEA eE E E E SRE 2 18 Timing characteristics 5c aere ORBE OR iit 12 VIE WIR Anele teet eere rar UNI M 3 Mopt conttolemeutt us cede eoe adios 8 10 Seiko Instruments Inc Head Office Components Sales Division 1 8 Nakase Mihama Ku Chiba shi Chiba 261 8507 Japan Phone 043 211 1216 FAX 043 211 8032 Seiko Instruments U S A Inc Electronic Components Division 2990 W Lomita Blvd Torrance Calif 90505 USA Phone 310 517 7770 FAX 310 517 8131 Seiko Instruments GmbH Siemensstrasse 9b 63263 Neu Isenburg Ger
8. use ketonic solvents ketone and acetone or aromatic solvents toluene and xylene as they may damage the polarizer 97 Index AN No G191D 460E Allowable dissipation ccccccnnnnnnonononanononononononocononnnnnonannnnnnnnnnnonnnnnconnonnononnnnn nn nn nro nnnnnnnoos 18 Blas values ni RL e ca ath dee ta eee Ace La ores eas 6 Bias voltage generation circuit ooooocononnnnncnnncnnonncnnnnnnnnnnnononnnnnnnnnnnonnonnnnnonnn ano n nn rra rocoso 8 11 Block diagrdrn c aet eee ete tede eh AE ee da ERREUR 8 Eecher nis Sen E EN A 18 19 20 Chip enable function cccessseseesecnncnccccsccescescescrssssesscsnceaceasccescessessreseesssesscesceasacaecs 9 Cleaning ios O ui E Cd 21 Common drive waveform oooooocccnncnccnnnnnononanonnnononnnnonnnnnnononnnononnnnn nono nni essa sese ettet nente nee 9 COMMON OLIVER EE 8 9 18 Be GE EE EE 3 4 Current consumption aerie ae e aa daaa Aaea ea ae aaaea aaeb a dea 2 INS Ge A Definition of response time ccccccscccccccccceccecceeeseesesssuecseceeeeeeececceseseeeeetsaseaaeeeeeeeeess 4 Definition of viewing angles t enhn rennen nenne nennen tenter nares 4 Display data put A tectae eee e i aA 5 Display data shift clock ooooococccncnnnnnnnnnnnnnnnananonononnnnncononnnnnnnnnnn nn non nnnnnnncncnnnos 2 5 9 Display ON OFF control terminal eeeeeeseeeeeeeeeeereneen eene eene nnne nns 5 IR ee EE 6 7 Effective voltage ei estet e iene o EE eet dis 6 PVC KOR d
9. your mouth and not to be injured by crushed glasses If the liquid crystal material touches your skin or clothes wash it off immediately using soap and plenty of water Handling Avoid static electricity as this can damage the CMOS LSI The LCD panel is made of plate glass do not hit or press against it Do not remove the panel or frame from the module The polarizer on the display is very fragile handle it very carefully Mounting and Design Mount the module using the specified installation sections and holes To protect the module from external pressure put a plate of transparent material such as acrylic or glass over the display surface frame and polarizer Leave a small gap between the transparent plate and the module x Example Small gap gt Transparent plate Module A A J Exterior surface Ru y Screw Keep the module dry Condensation can damage the transparent electrodes Storage Store the module in a dark place where the temperature is 25 C 10 C and the humidity is below 6596 RH Do not store the module near organic solvents or corrosive gases Do not crush shake or jar the module or its components Cleaning Do not wipe the polarizer with a dry cloth as it may scratch the surface Wipe the module gently with a soft cloth soaked with a petroleum benzine Do not
10. AN No G191D 460E LIQUID CRYSTAL DISPLAY MODULE G191D USER S MANUAL Seiko Instruments Inc AN No G191D 460E NOTICE This manual describes the technical information as well as the functions and operation of the G191D Liquid Crystal Display Module made by Seiko Instruments Inc Please read this manual carefully to familiarize yourself with the functions so you can make the best use of them The descriptions here are subject to change without notice Revision Record Edition Revision Date 1 Original June 1994 Seiko Instruments Inc 1994 Printed in Japan AN No G191D 460E CONTENTS G191D00P000 G191DB1P000 1 SPECIFICATIONS Til Generalitat e GEESS 1 EE 1 1 8 Absolute Maximum Ratings excluding LED backlight 2 1 4 Mechanical Characteristics sees nne nen nnne 2 1 5 Electrical Characteristics excluding LED backlignt ocoonnnnnnnunnonnonacnnnnnnnnnoss 2 1 6 Optical Characteristics it id Eine ee EE bones 3 1 7 LCD Panel Life Time eet ense deo ete ente been 4 1 8 DIMENSIONS EE 5 2 CIRCUIT CONFIGURATION 2 1 Liquid Crystal Driving Circuit eese nennen eene enne nee 6 2 2 Circuit Configuration sesenta naer ear ne aeai EEEE PEE EEEE EEES 8 2 3 Timing Characteristics cccccccccsssssecceecececceccsceseseesensessssaeeeeseeseceeeeseeeeeeeetneaea 12 2 4 Interface EE 14 G191DB1P000 3 LED BACKLIGHT 3 1 Absolute Maximum Ratings coccoonoo
11. M SEG output Display H Vt H L Va H ON H Vd L L Vc L x x Va OFF x Invalid The segment output is controlled by the INH signal When the INH signal is low Va is output to the segment irrespective of the display data and of the M signal 9 AN No G191D 460E Therefore by bringing the INH signal to low Va is output both to the common and to the segment electrodes making the voltage applied to the liquid crystal zero and the display goes off The relationship between the display data and display screen is shown below 1 2 3 4 5 ee 192 1 Ds D2 Di Do Ds D2 192 x 192 dots 1 192 duty 192 Figure 5 Relationship between the Display Data and Display Screen 3 Vopr control circuit Display screen contrast and viewing angle are affected by changes in the liquid crystal operating voltage Vopr As shown in Figure 6 external VLC is supplied to the operational amplifier and Vopr Va to Vf is generated and applied to the LCD panel Vop 5V Ra 5 6kQ Vopr Va to Vi Ne i e Operational amplifier VR 10kQ Gi Re 5600 Vic 24V Figure 6 Vopr Control Circuit Also display screen contrast and viewing angle are influenced by the ambient temperature The recommended Vopr level at different temperatures is as follows Table 4 Liquid Crystal Operating Voltage Temperature C 20 0 25 50 70 Liquid cr
12. Vopr SEG o COMo o SES Selection waveform e Vopr 10 12 Vopr bne 1 12 Vopr SEG COM ol dos Non selection waveform Eu 10 12 Vopr Figure 3 Drive Waveform 2 2 Circuit Configulation AN No G191D 460E The G191D consists of common drivers segment divers a bias voltage generation circuit an M generation circuit and a Vopr control circuit Figure 4 shows the block diagram for the G191D Do to Ds CL2 CL1 NC M gen eration circuit FLM i INH Von er Vss gt Va Ve Va Vi Vo Vic LEDA LEDC driver 2 driver 3 Va Vb Ve Vt Bias voltage generation circuit Vopr Va to Vo control circuit Common c driver 1 8 I Common Common Segment driver 1 Segment driver 2 Segment driver 3 192x192 full dot matrix LCD LCD module with LED backlight G191DB1P000 Common drivers HD66205TF Segment drivers HD66204TF Figure 4 Block Diagram for G191D AN No G191D 460E 1 Common driver HITACHI HD66205TF A common driver CD is a CMOS IC with 80 drive outputs The G191D has three CDs whose internal registers are connected to each other They operate as follows Input one frame timing signal FLM is taken into the internal shift register by the falling edge trigger of the one common line timing signal CL1 and sequen
13. efinition of angles 0 and amp AN No G191D 460E Note 2 Definition of viewing angles 01 and 02 Light Contrast C z 0 0 G191D00P000 7 9709 Sensor co EE 02 Y 180 8 01 I l LCD panel 20 passz KEE NC 3 14 x i 1 X 90 i 1 1 x 61 02 Viewing angle d Y 0 Remark The optimum viewing angle by visual inspection Z 0 90 and angle 0 at Cmax do not always match Light G191DB1P000 LED ON Note 3 Definition of contrast C Note 4 Definition of response time _ Brightness of non selected dot reflection Bz ee Me D Mae Brightness of selected dot reflection B o eee Me Te bees eet e Voltage V SINE v PA Ser e ege Sen SE Brightness curve for selected dot ec WE O a I D i Inn lt gt Brightness Non selected Selected status Non selected status curve for non status display ON display OFF Brightness selected dot Light 10 17 reflection A Brightness 9 Dark Operating voltage v lt gt tort Vopr Operating voltage ton Response time rise frim Frame frequency to Response time fall Note Measurement must be made using a transmissive LCD panel Figure 1 Definition 1 7 LCD Panel Life Time Item Conditions Standard Unit D 25 C 10 C Life time lt 65 RH 100 000 or more hrs
14. is transferred to the LCD module in four bit parallel Where G191D display screen has 1 192 duty The following section gives examples of interfaces using the Oki MSM6255GSK Seiko Epson SED1330F 1335F and Hitachi HD64646FS controllers 14 AN No G191D 460E 1 OKI MSM6255GSK MPU MSM6255GSK cs DIEN G191D WR 2 Fenn RD 3 CL2 DBo DB 4 INH 5 FLM 6 CL1 RDo RD7 8 M 9 Do z E K RAe RAs 10 D 11 D2 12 Ds WE Display RAM MAo MAis Address Ao A15 bus e 1 Von Ra 5 6kQ Ll Vss DC power supply WE 45V 13 Vic GND 14 Vo 24V Bee A 15 Vss ELM p 2 gt 16 NC LEDA G191DB1P000 a LED driving circuit L EEN 17 NC LEDC Figure 12 Interface Circuit With MSM6255GSK Features of the MSM6255GSK nterface with 80 series MPU possible Cursor ON OFF Blinking speed form and position are programmable Scrolling and paging CMOS process Power supply voltage 5V 10 15 AN No G191D 460E 2 SEIKO EPSON SED1330F 1335F MPU SED1330F 1335F G191D 2 Fenn XSCL Ta CL2 LAA INH YD 5 FLM LP Data bus 8 M VDo VDr AD 9 Do
15. m uL 6 Borward eurrert T LA AL dd RE EE E Rua 18 19 Forward current reduction characteristics ccccccsesseecececccccececceeusseeeeseseeeeeceeeess 18 19 Forward voltage aee toit picada dicta 18 19 Frame frequency iei bee rte ead dia eee eaae 2 4 6 Frame ground ee oso to m orte er e Ede erdt 5 HITACHI HD64646 S sse entere enne t aE anaa S etes enne aa iN sat 14 17 Input voltage a o ete eee eere e SU eei 1 2 Eege 14 VO terminal FUN ctl Ons A ee 4 AN No G191D 460E LED controllers icai citro ett er sativa Sieve eet ee EE EE da edes 14 EE GR ERREUR ULT CNRC 4 19 Limit resistance ente eui etie ble etre t bete ri rr roi lest sei ie Ras 19 Liquid crystal drive voltage adjustment terminal eese 5 Liquid crystal AC drive control senga 6 9 11 Liquid crystal operating voltage sese enne nennen eene nennen 10 M generation circuit h uepre eiie eene e an st esten sienne eet nnn nen anser eere 8 11 Non selection waveform ccccccccccccccccccccccceeusssssseescececcecscscssscuesesuuesseseeecececeeseeseeeeea 5 6 OKIMSMO255GSK i insectiiecettie tii 14 15 One common line timing signal occccncnnnnnnnnnnnnnnnonnnnnonononnnonnononnnonnn non nan nnnnnnnss 5 9 11 One frame timing signal ooocccnccnnnnnnnnnnnonananonononononnnonononononnnnnnnnnn nn nro nnnnnnnnnncnnnos 5 9 11 Operating temperature sonani iaei Ae i EE EA a a T 2 18 Operational amplifier 0 00 00
16. many Phone 49 6102 297 122 FAX 49 6102 297 116 Seiko Instruments H K Ltd Sales Division 4 5 F Wyler Centre 2 200 Tai Lin Pai Road Kwai Chung N T Kowloon Hong Kong Phone 852 24218611 FAX 852 24805479 Seiko Instruments Taiwan Inc 4FL No 40 Sec 2 Min Chuan E Taipei Taiwan R O C Phone 886 2 563 5001 FAX 886 2 521 9519 Seiko Instruments Singapore Pte Ltd 2 Marsiling Lane Singapore 739144 Phone 65 2691370 FAX 65 2699729
17. ns No Symbol Functions No Symbol Functions 1 Voo Power supply for logic 5V 10 D Display data input 2 Feno Frame ground 1 11 D2 Display data input 3 CL2 Display data shift clock 12 D3 Display data input 4 INH Display ON OFF control terminal 2 13 Vic Power supply for LC drive 24V 5 FLM One frame timing signal al Vo Liquid crystal drive voltage 6 CL1 One common line timing signal adjustment terminal 7 Vss GND ON 15 Vss GND OV 8 M INC 16 NC LEDA 3 9 Do Display data input 17 NC LEDC 3 1 The Feno terminal is connected to the module metal frame Use this terminal to ground the frame 2 The display is ON when INH is H and OFF when L 3 G191D00P000 NC G191DB1P000 Power supply for LED drive NO 16 LEDA NO 17 LEDC p AN No G191D 460E 2 CIRCUIT CONFIGURATION 2 1 Liquid Crystal Driving Circuit The G191D LCD panel drive waveform is shown in Figure 3 Since DC voltage will damage the liquid crystal AC voltage is applied between the two frames The signal controlling this is the liquid crystal AC drive control signal M Depending on the LCD panels increasing the liquid crystal AC drive waveform frequency may improve the display quality The G191D contains a circuit that generates AC drive control signal M which has a higher frequency than that of M The frequency of the M signal is adjusted according to the LCD panel to provide the best display
18. oltage At Temperatures Temperature Ta Conditions Vr min Vr typ VF max 20 C IF 100mA 3 9V 4 3V 4 7V 25 C IF 100mA 3 7V 4 1V 4 5V 70 C IF 50mA 3 4V 3 6V 3 9V Limit resistance R is calculated using the following equation The resistance becomes the value shown in Figure 15 VIN Input voltage power voltage V Ej NE en VF LED forward voltage V IF IF Allowable LED forward current A For this resistance value the forward current becomes lower than 50 mA at 25 C The surface brightness of the LED backlight varies with the forward current See Figure 16 Compared with 3 4 brightness IF 100 mA the brightness is about 30 19 AN No G191D 460E Relative brightness y Tam 40 50 60 70 80 90 100 110 Forward current Ir mA Figure 16 Forward Current Brightness Characteristics Ta 25 C 2 Example 2 When you want to keep the brightness 2 nit at 25 C use a thermosensitive element like a thermistor and a transistor as shown in Figure 17 Set the thermosensitive element to about IF 100 mA at 25 C and configure it so that IF will be reduced as the temperature rises Vn R3 S Thermistor R4 R1 Figure 17 LED Backlight Driver Examples 2 20 AN No G191D 460E 4 PRECAUTIONS Safety If the LCD panel breaks be careful not to get the liquid crystal material in
19. onoononnnnnoncnnonnnnnonnnanon ono nnnnnnnnnnnncnnnnnnnnananannnnnos 18 3 2 Electrical and Optical Characteristics ooooooooononononnnonononocnnnnnnnnnnn nono nononnnnnnncnnnoos 18 3 3 LED Backlight Connection Diagram ooconcoocooonooononnnonononnonocnnonnanonnno e nennen 18 3 4 Brightness panel upper side oooooocnnnnnnnccnncnnnnnnnnononnnnnnononononcnnnnnnononnonanano non oros 18 3 5 Tife TIM cL UR UR RI De e sie eH 19 3 6 LED Backlight Driver Examples eene 19 4 PRECAUTION eege Eed eee dens 21 INDEX AN No G191D 460E 1 SPECIFICATIONS 1 1 General The G191D is a very thin LCD module on which a full dot matrix LCD panel and a CMOS IC driver are integrated The LCD panel used here features wide viewing angle and high contrast This full dot configuration allows a wide variety of patterns to be displayed depending upon the input data The display position is the intersection point of the matrix transparent electrodes This prevents display distortion and displacement 1 2 Features G191D00P000 G191DB1P000 192 x 192 full dot matrix configuration 1 192 duty 1 12 bias Four bit parallel data input A wide temperature range gray mode STN LCD panel Positive display Display data H Display ON blue display color Display data L Display OFF gray background G191D00P000 Two types of power supply VDD 5V VLC 24V for driving liquid crystal Reflective type Weight Approx 62g G191DB1P000
20. own in the figure below in order not to damage the LCD driving circuit and the LCD panel LEM d Von GND is Ee i Ep ti ti GND 25 E E Vic Vie d te te AEN A Input signals GND KL 5V d INH GND t1 gt Oms t220ms ts gt 20ms Figure 9 Power ON OFF and Signal Input Timing 2 3 2 Timing Characteristics Ta 20 C to 70 C Vop 5 0V 5 Vss 0V tRCL2 tFCL2 2 12 Item Symbol Min Typ Max Unit FLM cycle time tCFLM 13 3 14 3 15 4 ms CL1 cycle time tccL1 10 74 4 Us CL1 high level width tWCL1H 50 ns CL1 low level width tWCL1L 1 us CL1 rise time tRCL1 30 ns CL1 fall time tFCL1 30 ns FLM setup time tFLMS 100 ns FLM hold time tFLMH 100 ns Allowable M delay time tDM 300 ns CL2 cycle time tccL2 125 ns CL2 high level width tWCL2H 45 ns CL2 low level width tWCL2L 45 ns CL2 rise time tRCL2 50 ns CL2 fall tim tFCL2 50 ns Data setup time tos 20 ns Data hold time tDH 20 ns CL2 rise to CL1 rise Hp ns CL2 fall to CL1 fall ts 80 ns CL1 rise to CL2 rise tus ns CL1 fall to CL2 fall tLH 80 ns tccL2 tWCL2H tWCL2L Timing Chart 1 Timing of Signal Input Into Common Driver
21. quality The frame frequency is normally set to 70 5 Hz to prevent screen flicker The G191D has a 1 192 duty cycle and the common electrodes are selected within a frame by time division from electrode 1 to electrode 192 This is called line sequential scanning The voltage level of the segment electrodes determines whether or not the dots at the intersection of the segment electrodes are selected when the common electrode is selected As shown in Table 1 there are six drive waveform voltage levels Va to Vf The voltage level is determined by the bias value The voltage between the segment and common electrode is then applied to the liquid crystal The selection waveform for SEGo COMo and the non selection waveform for SEG1 COM1 are shown in Figure 3 The size of the effective voltage of the waveform determines whether the liquid crystal under the selected dots is in the selection or non selection state Table 1 Va Common and segment selection level Vb Common non selection level Vc Segment non selection level Vd Segment non selection level Ve Common non selection level Vt Common and segment selection level AN No G191D 460E 1 frame SEG 0 1 2 COM HE como a 3 l a Ve I Vi Va COM EN dl Ve Vi 7 SEGo Ve Va Vi Va SEG Ve Va Vi Vopr es 1 12
22. tem Symbol Min Typ Max Unit Surface brightness Center of LCD panel Bn H9 an m i Measurement conditions and a measuring instrument are e Ta2 25 r 30 to 8596 RH IF 100mA e fFRM 70Hz VLC Optimum LC drive voltage Display OFF Entire display data L Measured 30 minutes after LED lights Measuring instrument BM 7 TOPCON 18 3 5 3 6 1 AN No G191D 460E Life Time Item Measurement conditions Standard Unit S G Ta 25 C 10T Life time IF 100mA 50 000 or more hrs Definition of life time The time until the brightness decreases to half of the initial brightness LED Backlight Driver Examples Example 1 A basic LED backlight driver example is shown in Figure 15 R 330 gt 1 4W LEDA Vin 5V en LEDC G191D Figure 15 LED Backlight Driver Example 1 Where resistance R is the limit resistance of the LED forward current The forward current depends upon the temperature Especially it must be decreased at high temperature For temperature dependence refer to forward current reduction characteristics described in 3 1 The operating temperature for the G191D ranges from 20 C to 70 C It is necessary to determine limit resistance R so that the forward current becomes 50 mA or lower at 70 C Forward voltage VF at each temperature of the LED backlight is shown in Table 5 Table 5 Forward V
23. tially shifted After 192 CL1 input the next FLM is input and the same operation is repeated As shown in Table 2 the common output is selected according to the shift register contents and the internally generated liquid crystal AC drive control signal M in the drive circuit and the common drive waveform are formed Table 2 Common Output INH Shift register content M COM output Display H Va H L Vi H ON H Ve L L Vb L x x Va OFF x Invalid The common output is controlled by the INH signal when the INH signal is low the common output is Va irrespective of the shift register contents or the M signal 2 Segment driver HITACHI HD66204TF A segment driver SD is a CMOS IC with 80 drive outputs The G191D has three SDs which operate as follows Input four bit data is sequentially taken into the internal register by the falling edge trigger of the display data shift clock CL2 The SDs have a chip enable function After 80 bits of data are taken into SD1 the next bit of data is automatically taken into SD2 Since G191D has three SDs 192 bits of data can be taken The display data taken into internal register are latched by the falling edge trigger of CL1 The segment output is selected according to this display data and M in the drive circuit and the segment drive waveform is formed as shown in the Table 3 Table 3 Segment Output INH Display data
24. ystal operating voltage Vopr V 26 0 25 0 24 0 22 5 21 0 Vopr Vpp Vo 10 AN No G191D 460E 4 Bias voltage generation circuit Six voltage levels Va to Vf are applied to the common and segment drivers The voltage is generated through operational amplifiers by resistance division from the liquid crystal operating voltage Vopr Here an operational amplifier is used as a voltage follower Voo O O Va Ri gt O e O Vb Ri rt H O Ve Vopr R2 S EB C d O Va Ri T p e O Ve t Operational Ra amplifiers Y O A O Vr 1 12 bias R22 12 4 R1 8R1 Figure 7 Bias Voltage Generation Circuit 5 M generation circuit As Figure 8 shows the M generation circuit performs an XOR on the one common line timing signal CL1 on which A time division is performed and the one frame timing signal FLM on which B time division is performed and outputs liquid crystal AC drive control signal M Values A and B are set according to the LCD panel so that the best display quality can be obtained and the drive voltage can be changed A frequency i CL1 divider _ ELM B frequency Ex OR gate j divider S Figure 8 M Generation Circuit 11 AN No G191D 460E 2 3 Timing Characteristics 2 3 1 Power ON OFF and Signal Input Timing Power ON OFF and signal input should be performed according to the timing sh
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