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AN.No.G482C-870E LIQUID CRYSTAL DISPLAY MODULE G48s2C USER MANUAL Seiko Instruments Inc.

AN.No.G482C-870E NOTICE This manual describes the technical information, the function, and the operation of the G482C Liquid Crystal Display Module of Seiko Instruments Inc. Please read this manual carefully to familialize yourself with the functions and to make best use of them. The descriptions here are subject to change without notice. Revision Record Edition Revision Date

1 Original ~ July 1988

©Seiko Instruments Inc. 1988 Printed in Japan -i-

AN.No.G482C-870E 1, SPECIFICATIONS

1.1 General

The G482C is a thin liquid crystal display (LCD) module that consists of a full dot- matrix LCD panel and CMOS LSlIs. The panel features a wide viewing angle and high contrast. The full dot-matrix structure allows both graphics and character display. In addition, the display is clear and stable, with no image warping or position skew, because the display position is specified by the intersection of transparent electrodes in a matrix.

1.2 Features

+ Full dot-matrix structure with 480 dotsx128 dots + 1/128 duty + One-bit serial data x 2 ( right-half and left-half ) input - Two power supplies : Vpp= 5 V, Vic= -13 V ( for driving liquid crystal )

1.3 Absolute Maximum Ratings

Vss = OV |e | symboi_| conditions | min. [max [unit _| inputvortage | vw | | -03 | vos |v | | Operating temperature | Tor | | oo | so | | | storagetemperature | tag | | -0 | +o | |

1.4 Electrical Characteristics

Vss = OV, Ta = 0°C ~ 50°C ee Powersupplyvottage |_ Vic | Yoo=sves% | -135 | -130 | -125 | v | ° Vpp = 5V£5% Vv id v inputvottage [Sh] vw | Voo=sve5% | 07voo | - | voo | v_| Input voltage Voossves% | 0 | - | 03v00 | v | Current consumption Vic= -13.0V [_Feamerrequency [tow | voo=sves% | os | 7 | 75 | te | -1-

AN.No.G482C-870E

1.5 Optical Characteristics (Measured with Yellow-green Type Module)

1/128 duty, 1/9 bias, Ta = 25°C Response time (rise) 6 = 15, O=0° | - | 130ms] - | notea | Response time (fall) 6 = 15°, © = 0° | - | 330ms | - | notea | Note 1: Definition of angles @ and @ Note 2 : Definition of viewing angles 61 and 62 Z (6=0°) Light (when reflected Sensor a rs & a LY Y"(@ = 180") e Contrast rey . i Y i. LCD panel 20 Poon frnnn non nnnn nnn Ree » KA EN een Se ! ! | NO a a Zz @ a Viewing angle 6 (© fixed) Light (when transmitted) ¥(@=0") Note: — Optimum viewing angle with the (0 = 90°) naked eye and viewing angle 8 at Cmax. above are not always the same. Note 3: Definition of contrast C Note 4: Definition of response time Mean Vopr c Brightness (reflection) of unselected dot (B2) Voltage a Brightness (reflection) of selected dot (By) ) . Ir Brightness (reflection) of --- selected dot Unselected | Selected state | Unselected state i state (dispaly ON} (dispaly OFF) (%) iB righ right : 9 owt Brightness Brightness Lo (reflection) of (transmission) {10% 90% Brightness unselected dot (reflection) Dark K> — ton tott \\ Note: Measured with a transmissive LCD 0 panel which is displayed 1 cm? Operating voltage (v) Vopr : Operating voltage term : Frame frequency ton Response time (rise) tott_: Response time (fall) -2-

AN.No.G482C-870E

1.6 Dimensions

Unit : mm/inch General tolerance: + 0.5mm “ps 4 —#-3. Sle} aosue| j | 23 oe Sls] oa8 | | Ss13/5| Height of 1C Fy Bes eee 8 z Fy 8] Beis | : NE i Baie $ ‘< tL, at3 a 2g a si _la © ft eeeeetnl-g1.0:t0.26F StS ale Sf 254x10=] \\ eas [2a A [esas /.177max, 0.48/.019 g3e SS SS SSeS EA = = = 2g, OOo § 9000 s| QOOV Figure 1 Dimensions [/O Terminal Functions] Symbol [no [Symbol Left-half screen display data le | a2 | Display data shift clock input Power supply voltage (1): +5 V Dz +} Right-half screen display data Le | vss_| GND:0 V input Vic Power supply voltage (2) : [3 | rum | One-frame timing signal -3V Liquid crystal drive waveform AC Vo Liquid crystal drive voltage signal adjustment terminal Ls | cir | one-commontine timing signal * The Fenp terminal is connected to the metal frame of the module. Use this terminal to ground the frame. -3-

AN.No.G482C-870E 2. CIRCUIT STRUCTURE

2.1 Liquid Crystal Driving Circuit

The drive waveform of the LCD panel is shown in Figure 2 on the next page. Since DC may damage the liquid crystal, the drive waveform polarity is reversed at alternate frames, and AC is applied between two frames. The signal controlling this is the liquid crystal drive waveform AC signal (M). The frame frequency is normally set to about 7045 Hz to prevent screen flicker. The G482C has a 1/128 duty cycle, and the common electrodes are selected within a frame by time division from electrode 1 to electrode 128. This is called line sequential scanning. The voltage level of the segment electrodes determines whether the dots at the intersection of the segment electrodes are selected or not, 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 electrodes is thus applied to the liquid erystal. The selection waveform for SEGg-COMg and the non-selection waveform for SEG1]-COMj are shown in Figure 2. 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 Common and segment selection level Common non-selection level Segment non-selection level Segment non-selection level Common non-selection level Common and segment selection level -4-

AN.No.G482C-870E

2.2 Circuit Structure

The G482C consists of common drivers, segment drivers, a bias voltage generation circuit and a Vopr control circuit. Figure 3 shows the block diagram. D2 : Dy cu oe ee be fe [a eT) eee eee oe Oe WT M UT TEST Tish TESTE TRL 1 FLM | Vss Vss sD sD sD sD sD Vop 1 2 3 5 6 |? [a> 480x128 full dot | matrix LCD Left-half screen Right-half screen (240 x 128) (240 x 128) cD Va 2 Ve Va Ve Var Viv Ver VE Bias voltage generation circuit Vss Vv ° Vopr ( Va- V4) ° control circuit CD : Common driver Vic SD : Segment driver Figure 3 Block diagram -~6-

AN.No.G482C-870E (1) Common driver A common driver (CD) is a CMOS IC with 64 drive outputs. The G482C has two CDs, whose internal registers are connected 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 sequentially shifted. After 128-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 liquid crystal drive waveform AC signal (M) in the drive circuit, and the common drive waveform is formed. Table 2 [inicio conn | w [ cower | H pe { ow | L (2) Segment driver A segment driver (SD) is a CMOS IC with 80 drive outputs. It operates 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 G482C has six SDs. SD1 to SD3 are for left-half sereen and SD4 to SD6 are for right-half sereen. SD has a chip enable function. In the case of left-half screen, after 80 bits of data are taken into SD1, the next data is automatically taken into SD2. 240 bits of data can be taken into three SDs. Data for right-half screen is taken into in the same way as data for left-half screen. The display data taken into internal register are latched by the falling edge trigger of CL1. As shown in the Table 3, the segment output is selected according to the display data and M in the drive circuit, and the segment drive waveform is formed. Table 3 [pinoyaow | mw | secon | H L -7-

AN.No.G482C-870E (3) Vopr control cireuit Display screen contrast and viewing angle are affected by changes in the liquid erystal driving voltage (Vopr). As shown in Figure 4, external VLC is supplied to the operational amplifier and Vopr (Va to Vf ) applied to the LCD panel is generated. : Vpp = 5V : O DD ° : Vss= OV i poco Roo : (Vato Vs) ! i 2, : oO VR Sq.---ie(- YO i i Operational amplifier 1 i incensed (CE BY R= 20kQ VR= 10kQ Figure 4 Also, display screen contrast and viewing angle are influenced by the ambient temperature. The recommended Vopr level at different temperatures is as follows. a Vopr = Voo- Vo -8-

AN.No.G482C-870E (4) Bias voltage generation circuit Six levels of voltage, Va to Vf, are applied to the common and segment drivers. The voltage is generated through operational amplifier by resistance-division from liquid crystal operating voltage (Vopr). Here, an operational amplifier is used as a voltage follower. Vop Va Ry c Vb > © Ve Rp c Vopr > © Va a of se LA | > © Ve Ry i Operational amplifiers I Vs 1/9 bias : Ro= (9-4)R,= 5R, Figure 5 Bias voltage generation circuit -9-

AN.No.G482C-870E

2.3 Timing Characteristics

Ta = 0°C~50°C Vpp = 5.0V+5% eat [in [oe | [arnavee wan [wen [oe | [| o Faron pie wen | wen [oo | = | o Fone tne | wn | we | = | Fone micimes | vm | we | - |» | ates wear ine [vim [a0 | ow | m| Pros soalvieene fw | = | >] = Peso srine [| = | | ee Ferner nie wan [wer | se | = | Fexrw ue wan | we [se | = | | Po mopnes [we | | - |» Poomnowimes | wwe [me | = | > | Peanewarme | fw] - |» -10-

AN.No.G482C-870E

2.4 Interface Circuit

The G482C 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, and sending display timing signals and display data to the LCD module, and other functions such as cursor display. The G482C must use LCD controllers conforming to the following conditions. © For a full dot-matrix LCD module © Where data is transferred to the LCD module in 2 one-bit serials © Where G482C display screen has 1/128 duty The following section gives examples of interfaces using the OKI MSM6255GSK and HITACHI HD61830B controllers. -12-

AN.No.G482C-870E (1) OKI MSM6255GSK MPU MSM6255GSK cs DIEN > ‘WR eta =D ub G4ag2c bus 0 7 4 wi—+[2 [v2 | ROy~ROr LFRME Te Ty | < HP Vs [eur | $ ofl fa | = >| cc Rom K-44 ~ om(va] ela} arlcorm| Mar RAs 18 | vss | ReLo [uc | }10| Vo | az Address! WE Display Ln ND. bus RAM AoW MA R= 20k2 oo ~ As VR= 10kQ DC power supply +5V ‘ GND -13V Figure 8 Interface circuit with MSM6255GSK [ Features of the MSM6255GSK ] e Interface with 80-series MPU possible e Cursor -ON/OFF/Blink; blinking speed, form, and position are programmable @ Scrolling and paging @ CMOS process @ 5-V single power supply -13-

AN.No.G482C-870E (2) HITACHI HD61830B MPU HD61830B CR cs - R/W RS G482C E 1 Tb | Lag Le | cL ls | Data bus > DBo~DB7 | cL2 rele | 1 7 | [ Vop | MDo~MD7 8 | vss | SR lo Tc | oes We ispla = RAM. C OE R= 20kQ MAg~MAiq VR= 10kQ DC power supply +5V GND -13V Figure 9 Interface circuit with HD61830B [ Features of the HD61830B ] e Interface with eight-bit MPU possible @ Cursor ¢ Built-in character generator ROM: 7360 bits ON/OFF/Blink - Character font: 192 kinds © Character Blink ( 5x? dot-matrix ) x160 kinds e Bit manipulation (5x11 dot-matrix ) x32 kinds ® CMOS process - External ROM : can be extended to 4KB e 5-V single power supply © Scrolling -14-

AN.No.G482C-870E 3. NOTES Safety + If the LCD panel breaks, be careful not to get the liquid crystal in your mouth. If the liquid crystal 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 aginst 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 in 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. vw Example Small gap Transparent plate cS | a —-- 5 xX Screw + Design the system so that no input signal is given unless the power-supply voltage is applied. + Keep the module dry. Condensation can damage the transparent electrodes . -15-

AN.No.G482C-870E Storage + Store the module in a dark place where the temperature is 25°C +10°C and the humidity below 65% RH. + Do not store the module near organic solvents or corrosive gases. - Do not crush, shake, or jolt 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 use ketonic solvents (ketone and acetone) or aromatic solvents (toluene and xylene), as they may damage the polarizer. - 16-

-B- Bias VAIUC eee eee e eee ee ec ee ee tence erence ce eeeceeeveseee 4 Block diagraM se cece cece eee cere reece eee e cece cece reeeesee 6 -C- Common drive waveform... ee eee eee ee eee cece cece cette teeeeee 7 Common driver 2... cece cece cece cere eee ence eee ee eneee 6, 7, 11 Contrast sees cece cece nrc ce eee ecccrcccceeevesesscceves 1,2 Current consumption 2... eee cece cece eee e cece ener steeerecccee L -D- Definition of contrast . se. ee cece cece cece e eee e ee eee cette cecee 2 Definition of response time 6. eee eee ee eee eee cece eee eee eteeeee 2 Display data input 22... . cece cece eee eee eee eee ete e eens DB Display data shift ClOCK eee ee eee ee eee ee eee eee e nee ccrene 87 Drive waveform ...cc cece e eee cece cree eee e eect eee ccecceecee 4,5 -E- -F- Flicker see e cece cere eee cee r erence ewes sere rercccensscssvees 4A Frame frequency .. cece eee e eect cece c cece cece eeeccceeeeee§ 12,4 -H- HITACHI HD61830B .. 1. eee eee eee ee eee eee reece eens 12, 14 -l- Input voltage 2.2... cee ee ee ec ee eee eee eee eee eee 1 1/O terminal functions 1.1... eee eee eee ee eee eee eee eect eeecee 8

-L- LCD controller... cece cece cece eee eee eee eee e eee e ec eeececes 12 -N- -O- Operating temperature 2... see e eee e cece cece reer eee reeeerecees 1 -p- Power supply voltage . 2. eee eee cece eee eee ence eee eeeeees 1, 3, 15 -R- Resistance division 6... cece cece eee e eee ec e cence e erences eeee 9 Response time (fall) 2... cece cece cece cece eee cence eee eeecccce 2 Response time (rise) 2... cece cece eee eee cece eect ee eeeeeeeccces 2 -S- Segment drive waveforM .... eee ceee cece e cece c cc eecceteecccces 7 Segment driver 2... cece cece cee cee eee c erence en eeeee 6, 7, 11 Selection waveform 1... ec cece cece cece e cece eect ee ereeecceee 4S Storage wee eee cece cece cere cece eee e cece ccereccccccccccecs 16 Storage temperature 2.2... cece eee eee e reece eeceescccvese 1 -v- Viewing angle. eee ee ee ee ce ec cece ee ee cee eect cece cer cerccee 2 Vopr control circuit 2... eee eee eee ee eee eee cere reece cere cccee 6,8

Seiko Instruments Inc. Head Office ‘Components Sales Department 1-8, Nakase, Mihama-ku, Chiba-shi, Chiba 261, Japan Phone: 043-211-1216 FAX: 043-211-8035 Seiko Instruments U.S.A. Inc. Electronic Components Division 2990 W. Lomita Blvd., Torrance Calif. 90505, USA Phone: 310-517-7770 FAX: 310-517-7792 Seiko Instruments GmbH Siemensstrasse 9b, 63263 Neu-lsenburg, Germany Phone: 49-6102-297-0 FAX: 49-6102-297-222 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. Phone: 886-2-563-5001 FAX: 886-2-521-9519 Seiko Instruments Singapore Pte. Ltd 2, Marsiling Lane Woodland New Town Singapore 2573 Phone: 65-2691370 FAX: 65-2699729

Product Information

G482C specifications and overview.

Summary

LIQUID CRYSTAL DISPLAY MODULE?

Description

LIQUID CRYSTAL DISPLAY MODULE?

Source title G482C Datasheet(PDF) - Seiko Instruments Inc

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