LM200WD3 LG | Alldatasheet
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Technical content
Datasheet sections
- 1 GENERAL DESCRIPTION
- 2 ABSOLUTE MAXIMUM RATINGS
- 3 ELECTRICAL SPECIFICATIONS
- 4 OPTICAL SFECIFICATIONS
- 5 MECHANICAL CHARACTERISTICS
- 6 RELIABILITY
- 7 INTERNATIONAL STANDARDS
- 8 PACKING
- 9 PRECAUTIONS
Ver. 0.1 Apr., 20, 2012 SPECIFICATION FOR APPROVAL Title 20.0” HD+ TFT LCD *When you obtain standard approval, please use the above model name without suffix BUYER MODEL SUPPLIER LG Display Co., Ltd. *MODEL LM200WD3 SUFFIX TLF1 (◆) Preliminary Specification (◆) Final Specification SIGNATURE DATE Please return 1 copy for your confirmation With your signature and comments. General K.G. Park / G.Manager Product Engineering Dept. LG Display Co., Ltd APPROVED BY DATE REVIEWED BY PREPARED BY D.G. Kim / Manager [C] S.J. Yeom / Engineer C.S. Shin / Manager [P] H.D. Joo / Manager [M]
Ver. 0.1 Apr., 20, 2012 Revision No Description Date Page Ver.0.1 Preliminary Specifications. Apr.,20,2012 Record of revisions
Ver. 0.1 Apr., 20, 2012 1. General description LM200WD3-TLF1 is a Color Active Matrix Liquid Crystal Display with an integral Light Emitting Diode(LED) backlight system. The matrix employs a-Si Thin Film Transistor as the active element. It is a transmissive type display operating in the normally white mode. It has a 20.0 inch diagonally measured active display area with HD+ resolution (900 vertical by 1600 horizontal pixel array) Each pixel is divided into Red, Green and Blue sub-pixels or dots which are arranged in vertical stripes. Gray scale or the brightness of the sub -pixel color is determined with a 8-bit gray scale signal for each dot, thus, presenting a palette of more than 16.7M colors with Advanced-FRC(Frame Rate Control). It has been designed to apply the interface method that enables low power, high speed, low EMI. FPD Link or compatible must be used as a LVDS(Low Voltage Differential Signaling) chip. It is intended to support applications where thin thickness, wide viewing angle, low power are critical factors and graphic displays are important. In combination with the vertical arrangement of the sub -pixels, the LM200WD3-TLF1 characteristics provide an excellent flat panel display for office automation products such as monitors. General features Outline Dimension 462.8(H) x 272.0(V) x 10.2(D) mm(Typ.) Active screen size 20.0 inches (508.05mm) diagonal Pixel Pitch 0.09225*RGB(H)mm x 0.27675(V)mm Pixel Format 1600 horizontal By 900 vertical Pixels. RGB stripe arrangement Color depth 16.7M colors Luminance, white 250 cd/m2 (Center 1Point, typ) Power Consumption Weight 1,490 g (Typ.) Display operating mode Transmissive mode, normally White Surface treatments Interface LVDS 2Port Viewing Angle (CR>10) R/L 170(Typ.), U/D 160(Typ.) CN1 LVDS pair #1 LVDS pair #2 Power circuit block +5V VLCD Source driver circuit TFT-LCD Panel (1600×RGB×900 pixels) S1 S1600 G900 Backlight assembly (White LED) RGB Timing controller FIG. 1 Block diagram Hard coating (3H), Anti-glare treatment of the front polarizer VLED 2ch Total 12.8 W(Typ.), (3.0 W@VLCD , 9.8 W@IBL = 120 mA)
may cause faulty operation or damage to the unit. Note : 1. Temperature and relative humidity range are shown in the figure below. Wet bulb temperature should be 39 °C Max, and no condensation of water.
- Maximum Storage Humidity is up to 40℃, 90% RH only for 4 corner light leakage Mura.
- Storage condition is guaranteed under packing condition.
- LCM Surface Temperature should be Min. 0℃ and Max. 65℃ under the VLCD=5.0V,
fV=60Hz, 25℃ ambient Temp. no humidity control and LED string current is typical value. Table 1. Absolute maximum ratings
- Electrical specifications
generated by an LED Driver. The LED driver is an external unit to the LCDs. Table 2. Electrical characteristics
- The specified characteristics perform under the V LCD=5.0V, 25 2°C, fV=60Hz condition.
- Permissive Power Ripple should be measured under VLCD=5.0V, 25 2°C,
- Mosaic pattern(8 x 6) is displayed.
- Input current is specified at the maximum current pattern.
- The duration of Inrush current is about 5ms and rising time of power Input is 500us 20%.
Table 3. LED array ELECTRICAL CHARACTERISTICS : The design of the LED driver must have specifications for the LED in LCD Assembly . influenced by the characteristics of the LED driver. should be Constant current control. variation among the strings of LEDs. the mismatch of the LED and the LED driver (no lighting, flicker, etc) never occurs. installed in your instrument.
- The specified values are for a single LED bar.
- The specified current is defined as the input current for a single LED string with 100% duty cycle.
- The LED life time is defined as the time when brightness of LED packages become 50% or less
than the initial value under the conditions at Ta = 25 2°C and LED string current is typical value.
- The power consumption shown above does not include loss of external driver.
The typical power consumption is calculated as PBar = Vs(Typ.) x Is(Typ.) x No. of strings. The maximum power consumption is calculated as PBar = Vs(Max.) x Is(Typ.) x No. of strings.
- LED operating conditions must not exceed Max. ratings.
Table 4. Module connector(CN1) pin configuration
Ver. 0.1 Apr., 20, 2012 FIG. 4 Connector diagram Note: 1. NC: No Connection. 2. All GND(ground) pins should be connected together and to Vss which should also be connected to the LCD’s metal frame. 3. All VLCD (power input) pins should be connected together. 4. Input Level of LVDS signal is based on the IEA 664 Standard. 5. PWM_OUT is a reference signal for inverter control. This PWM signal is synchronized with vertical frequency. Its frequency is 3 times of vertical frequency, and its duty ratio is 50%. If the system don’t use this pin, do not connect. Rear view of LCM 1’st signal pairs 2’nd signal pairs Power(+5V) 1 #30 #1 #30 GT103-30S-HF15-ES2500 (LSM) PWM_OUT
Table 5. LED connector pin configuration
1 FB1 Channel1 Current Feedback
2 NC No connection
3 VLED LED Power Supply
4 VLED LED Power Supply
5 NC No connection
6 FB2 Channel2 Current Feedback
The LED interface connector is a model SM06B-SHJH(HF) manufactured by JST. The mating connector is a SHJP-06V-S(HF) or SHJP-06-A-K (HF ) and Equivalent. The pin configuration for the connector is shown in the table below.
Ver. 0.1 Apr., 20, 2012 Description Symbol Min Max Unit Notes LVDS Differential Voltage |VID| 200 600 mV - LVDS Common mode Voltage VCM 0.6 1.5 V - LVDS Input Voltage Range VIN 0.3 1.8 V - 3-3-2. DC Specification 3-3. LVDS characteristics LVDS + LVDS - VCM # VCM = {(LVDS+) + (LVDS-)}/2 |VID| VIN_MAX VIN_MIN 3-3-1. LVDS Data format < LVDS Data Format > OG 0 OR 5 OR 4 OR 3 OR 2 OR 1 OR 0 OB 1 OB 0 OG 5 OG 4 OG 3 OG 2 OG 1 DE VSYNC HSYNC OB 5 OB 4 OB 3 OB 2 X OB 7 OB 6 OG 7 OG 6 OR 7 OR 6 Current ( Nth ) Cycle Previous ( N - 1 ) th Cycle Next ( N + 1 ) th Cycle RCLK + RXinO 0 +/ - Tclk * 4 / 7 Tclk * 3 / 7 Tclk Tclk * 1 / 7 MSB R 7 R 6 R 5 R 4 R 3 R 2 R 1 R 0 LSB EG 0 ER 5 ER 4 ER 3 ER 2 ER 1 ER 0 EB 1 EB 0 EG 5 EG 4 EG 3 EG 2 EG 1 DE VSYNC HSYNC EB 5 EB 4 EB 3 EB 2 X EB 7 EB 6 EG 7 EG 6 ER 7 ER 6 * ODD = 1 st Pixel EVEN = 2 nd Pixel RXinO 1 +/ - RXinO 2 +/ - RXinO 3 +/ - RXinE 0 +/ - RXinE 1 +/ - RXinE 2 +/ - RXinE 3 +/ - OR 3 OR 2 OR 1 OR 0 OG 4 OG 3 OG 2 OG 1 OB 5 OB 4 OB 3 OB 2 OG 7 OG 6 OR 7 OR 6 ER 3 ER 2 ER 1 ER 0 EG 4 EG 3 EG 2 EG 1 EB 5 EB 4 EB 3 EB 2 EG 7 EG 6 ER 7 ER 6 OG 0 OR 5 OR 4 OB 1 OB 0 OG 5 DE VSYNC HSYNC X OB 7 OB 6 EG 0 ER 5 ER 4 EB 1 EB 0 EG 5 DE VSYNC HSYNC X EB 7 EB 6
Ver. 0.1 Apr., 20, 2012 Description Symbol Min Max Unit Notes LVDS Clock to Data Skew Margin tSKEW - 400 + 400 ps 85MHz > Fclk ≥ 65MHz tSKEW - 600 + 600 ps 65MHz > Fclk ≥ 25MHz Maximum deviation of input clock frequency during SSC FDEV - ± 3 % 1 LVDS Clock to Clock Skew Margin (Even to Odd) tSKEW_EO - 1/7 + 1/7 Tclk - 3-3-3. AC Specification LVDS Data t SKEW LVDS Clock T clk t SKEW ( F clk = 1 / T clk ) 1 ) 85 MHz > Fclk ≥ 65 MHz : - 400 ~ + 400 2 ) 65 MHz > Fclk ≥ 25 MHz : - 600 ~ + 600 LVDS Even Data LVDS Odd Clock LVDS Even Clock t SKEW _ EO T clk T clk < Clock skew margin between channel > < Clock skew margin between clock (Even/Odd) > Note 1 : This SSC specifications are just T-CON operation specification. In case of various system condition, the optimum setting value of SSC can be different. LGD recommend the SI should be adjust the SSC deviation and modulation frequency in order not to happen any kinds of defect phenomenon.
Table 6. Required signal assignment for Flat Link(NS:DS90CF383) transmitter Notes : Refer to LVDS Transmitter Data Sheet for detail descriptions.
1 Power Supply for TTL Input VCC 29 Ground pin for TTL GND
2 TTL Input (R7) D5 30 TTL Input (DE) D26
3 TTL Input (R5) D6 31 TTL Level clock Input TX CLKIN
4 TTL Input (G0) D7 32 Power Down Input PWR DWN
5 Ground pin for TTL GND 33 Ground pin for PLL PLL GND
6 TTL Input (G1) D8 34 Power Supply for PLL PLL VCC
7 TTL Input (G2) D9 35 Ground pin for PLL PLL GND
8 TTL Input (G6) D10 36 Ground pin for LVDS LVDS GND
9 Power Supply for TTL Input VCC 37 Positive LVDS differential data output 3 TxOUT3＋
10 TTL Input (G7) D11 38 Negative LVDS differential data output 3 TxOUT3－
11 TTL Input (G3) D12 39 Positive LVDS differential clock output TX CLKOUT＋
12 TTL Input (G4) D13 40 Negative LVDS differential clock output TX CLKOUT－
13 Ground pin for TTL GND 41 Positive LVDS differential data output 2 TX OUT2＋
14 TTL Input (G5) D14 42 Negative LVDS differential data output 2 TX OUT2－
15 TTL Input (B0) D15 43 Ground pin for LVDS LVDS GND
16 TTL Input (B6) D16 44 Power Supply for LVDS LVDS VCC
17 Power Supply for TTL Input VCC 45 Positive LVDS differential data output 1 TX OUT1＋
46 Negative LVDS differential data output 1 TX OUT1－ 18 TTL Input (B7) D17
47 Positive LVDS differential data output 0 TX OUT0＋
48 Negative LVDS differential data output 0 TX OUT0－
19 TTL Input (B1) D18
20 TTL Input (B2) D19
49 Ground pin for LVDS LVDS GND 21 Ground pin for TTL Input GND
22 TTL Input (B3) D20
23 TTL Input (B4) D21
50 TTL Input (R6) D27
51 TTL Input (R0) D0
24 TTL Input (B5) D22
25 TTL Input (RSVD) D23
52 TTL Input (R1) D1
53 Ground pin for TTL GND
26 Power Supply for TTL Input VCC 54 TTL Input (R2) D2
55 TTL Input (R3) D3 27 TTL Input (HSYNC) D24
56 TTL Input (R4) D4 28 TTL Input (VSYNC) D25
Table 7. Timing table timing should be satisfied with the following specifications for it’s proper operation.
- DE Only mode operation. The input of Hsync & Vsync signal does not
have an effect on LCD normal operation.
- The performance of the electro-optical characteristics may be influenced by variance of the
- Horizontal period should be even.
- Hsync Period, Hsync Width, and Horizontal Back Porch should be any times of of character
Ver. 0.1 Apr., 20, 2012 3-5. Signal timing waveforms Dclk tCLK Valid Invalid Invalid DE(Data Enable) Data tSI tHI tSD tHD DE(Data Enable) tVV tVP DE DE(Data Enable) tHP tHV DE 1. DCLK , DE, DATA waveforms 2. Horizontal waveform 3. Vertical waveform
provides a reference for color versus data input. Table 8. Color data reference
- Please avoid floating state of interface signal at invalid period.
- When the interface signal is invalid, be sure to pull down the power supply for
- LED power must be turn on after power supply for LCD an interface signal are valid.
Table 9. Power sequence
Ver. 0.1 Apr., 20, 2012 3-8. VLCD Power dip condition 1) Dip condition 3.5V ≤VLCD＜ 4.5V , td≤20ms 2) VLCD＜ 3.5V VLCD-dip conditions should also follow the Power On/Off conditions for supply voltage. 4.5V 3.5V VLCD td FIG. 6 Power dip condition GND(ground)
Table 10. Optical characteristics Ta= 25°C, VLCD=5.0V, fV=60Hz fCLK=54.0MHz, IBL=120mA
Ver. 0.1 Apr., 20, 2012 Notes : 1. Contrast ratio(CR) is defined mathematically as :It is measured at center point(1) Surface luminance with all white pixels Surface luminance with all black pixels 2. Surface luminance is the luminance value at center 1 point(1) across the LCD surface 50cm from the surface with all pixels displaying white. For more information see FIG 8. 3. The variation in surface luminance , WHITE is defined as Minimum (P1,P2 …..P9) Maximum (P1,P2 …..P9) For more information see Figure 8. FIG. 8 Luminance measuring point <Measuring point for luminance variation> <Measuring point for surface luminance> H H/2 V/2 V H : 442.8 mm V : 249.075 mm @ H,V : Active Area Active Area 4 2 H V 5 6 8 9 V/10 V/2 H/2 H/10 The values specified are at an approximate distance 50cm from the LCD surface at a viewing angle of and equal to 0 °. FIG. 7 presents additional information concerning the measurement equipment and method. FIG. 7 Optical characteristic measurement equipment and method 50cm Optical Stage(x,y) LCD Module Pritchard 880 or equivalent
Ver. 0.1 Apr., 20, 2012 FIG. 9 Response time (measurement equipment : RD-80S) 4. Response time is the time required for the display to transition from black to white (Decay Time, TrD) and from white to black (Rise Time, TrR) The sampling rate is 500K sample/sec. For additional information see FIG. 9. The response time is defined as the following figure and shall be measured by switching the input signal for each gray to gray. 5. Viewing angle is the angle at which the contrast ratio is greater than 10 or 5. The angles are determined for the horizontal or x axis and the vertical or y axis with respect to the z axis which is normal to the LCD surface. For more information see FIG. 10 . FIG. 10 Viewing angle 100 [%] Optical response white black white TrR TrD Notes : <Dimension of viewing angle range> Normal Y E = 0, Right = 180, Left = 270, Down = 90, Up
Ver. 0.1 Apr., 20, 2012 The equation of crosstalk : (LA[or C]2-LA[or C]1/LA[or C]1) 100(%) [Vertical], (LB[or D]2-LB[or D]1/LB[or D]1) 100(%) [Horizontal] A/8 B/8 B A A/2 B/2 LA1 LB1 LC1 LD1 B/4 A/4 A/2 A/4 LA2 LB2 LC2 LD2 B/4 B/2 Pattern 1 (Half gray: gray 127) Pattern 2 (Background: gray 127, Rectangular: gray 0, gray255 ) Notes : 6. Crosstalk is defined as For more information see Figure 11. FIG. 11 Crosstalk measuring point
Ver. 0.1 Apr., 20, 2012 7. Luminance Uniformity - angular – dependence (LR& TB) TCO 5.0 Luminance uniformity – angular dependence, is the capacity of the VDU to present the same Luminance level independently of the viewing direction. The angular-dependent luminance uniformity is calculated as the ratio of maximum luminance to minimum luminance in the specified measurement areas. - Test pattern : Full white 4˚× 4˚square size, back ground shall be set to 80% image loading, RGB 204, 204, 204 - Test luminance : ≥150cd/㎡ - Test point : 5-point - Test distance : D * 1.5 = 76.22㎝ TB = ((Lmax.+15deg. / Lmin. +15deg.) Notes : < Luminance uniformity - angular dependence measuring point > FIG. 12 Luminance Uniformity angular dependence H V H/10 V/2 H/2 V/10 V/10 H/10 D
Ver. 0.1 Apr., 20, 2012 Notes : 8. Color grayscale linearity , Δu’v’ is defined as Where indices A and B are the two gray levels found to have the largest color differences between them. i.e. get the largest Δu’ and Δv’ of each 6pairs of u’ and v’ and calculate Δu’v’ . -Test pattern : 100% full white pattern with a test pattern as shown FIG.12 Squares of 40mm by 40mm in size, filled with 255, 225, 195, 165, 135 and 105 grayscale steps should be arranged in the center of the screen. -Test method First gray step : move a square of 255 gray level should be moved into the center of the screen and measure luminance and u’ and v’ coordinates. Next gray step : move a 255 gray square into the center and measure both luminance and u’ and v’ coordinates. The same procedure shall then be repeated for gray steps 195, 165, 135 and 105. 22 )''()''( BABA vvuu FIG. 13 Color grayscale linearity 40mm 40mm
- Mechanical characteristics
page are detailed mechanical drawing of the LCD. Notes : Please refer to a mechanic drawing in terms of tolerance at the next page. Table 11. Mechanical characteristics
Ver. 0.1 Apr., 20, 2012 <FRONT VIEW>
Ver. 0.1 Apr., 20, 2012 <REAR VIEW>
Table 12. Environment test conditions quality test is conducted under normal operating condition.
Ver. 0.1 Apr., 20, 2012 7. International standards Class 1M LED Product IEC60825-1 : 2001 Embedded LED Power (Class1M) Notes 1. Laser (LED Backlight) Information 2. Caution : LED inside. Class 1M laser (LEDs) radiation when open. Do not open while operating. a) UL 60950-1, Underwriters Laboratories Inc. Information Technology Equipment - Safety - Part 1 : General Requirements. b) CAN/CSA C22.2 No.60950-1-07, Canadian Standards Association. Information Technology Equipment - Safety - Part 1 : General Requirements. c) EN 60950-1:2006 + A11:2009, European Committee for Electrotechnical Standardization(CENELEC). Information Technology Equipment - Safety - Part 1 : General Requirements. d) IEC 60950-1, The International Electrotechnical commission(IEC). Information Technology Equipment - Safety - Part 1 : General Requirements. (Including report of IEC60825-1:2001 clause 8 and clause 9) 7-3. Environment a) RoHS, Directive 2002/95/EC of the European Parliament and of the council of 27 January 2003 7-2. EMC a) ANSI C63.4 “American National Standard for Methods of Measurement of Radio -Noise Emissions from Low-Voltage Electrical and Electronic Equipment in the Range of 9 kHz to 40 GHz.” American National Standards Institute (ANSI), 2003. b) CISPR 22 “Information technology equipment – Radio disturbance characteristics – Limit and methods of measurement." International Special Committee on Radio Interference (CISPR), 2005. c) CISPR 13 “Sound and television broadcast receivers and associated equipment – Radio disturbance characteristics – Limits and method of measurement.” International Special Committee on Radio Interference (CISPR), 2006. 7-1. Safety
Ver. 0.1 Apr., 20, 2012 8. Packing 8-1. Designation of lot mark a) Lot mark A B C D E F G H I J K L M A,B,C : Size (Inch) D : Year E : Month F ~ M : Serial No. Note: 1. Year 2. Month Mark Year K 2020 F 2016 G 2017 H 2018 J 2019 D 2014 E 2015 C B A 2013 2012 2011 B Nov Mark Month A Oct Jun Jul Aug Sep Apr May C 3 2 1 Dec Mar Feb Jan b) Location of lot mark Serial No. is printed on the label. The label is attached to the backside of the LCD module. This is subject to change without prior notice. 8-2. Packing form a) Package quantity in one box : 12 pcs(2 Modules are packed in 1 AL Bag.) b) Box size : 355mm x 305mm X 560mm
Ver. 0.1 Apr., 20, 2012 9. Precautions Please pay attention to the followings when you use this TFT LCD module. 9-1. Mounting Precautions (1) You must mount a module using holes arranged in left & right sides. (2) You should consider the mounting structure so that uneven force (ex. Twisted stress) is not applied to the Module. And the case on which a module is mounted should have sufficient strength so that external force is not transmitted directly to the module. (3) Please attach the surface transparent protective plate to the surface in order to protect the polarizer. Transparent protective plate should have sufficient strength in order to the resist external force. (4) You should adopt radiation structure to satisfy the temperature specification. (5) Acetic acid type and chlorine type materials for the cover case are not desirable because the former generates corrosive gas of attacking the polarizer at high temperature and the latter causes circuit break by electro-chemical reaction. (6) Do not touch, push or rub the exposed polarizers with glass, tweezers or anything harder than HB pencil lead. And please do not rub with dust clothes with chemical treatment. Do not touch the surface of polarizer for bare hand or greasy cloth. (Some cosmetics are detrimental to the polarizer.) (7) When the surface becomes dusty, please wipe gently with absorbent cotton or other soft materials like chamois soaks with petroleum benzene. Normal-hexane is recommended for cleaning the adhesives used to attach front / rear polarizers. Do not use acetone, toluene and alcohol because they cause chemical damage to the polarizer. (8) Wipe off saliva or water drops as soon as possible. Their long time contact with polarizer causes deformations and color fading. (9) Do not open the case because inside circuits do not have sufficient strength. 9-2. Operating precautions (1) The spike noise causes the mis-operation of circuits. It should be lower than following voltage : V=±200mV(Over and under shoot voltage) (2) Response time depends on the temperature.(In lower temperature, it becomes longer.) (3) Brightness depends on the temperature. (In lower temperature, it becomes higher.) And in lower temperature, response time(required time that brightness is stable after turned on) becomes longer. (4) Be careful for condensation at sudden temperature change. Condensation makes damage to polarizer or electrical contacted parts. And after fading condensation, smear or spot will occur. (5) When fixed patterns are displayed for a long time, remnant image is likely to occur. (6) Module has high frequency circuits. Sufficient suppression to the electromagnetic interference shall be done by system manufacturers. Grounding and shielding methods may be important to minimized the interference. (7) Please do not give any mechanical and/or acoustical impact to LCM. Otherwise, LCM can not be operated its full characteristics perfectly. (8) A screw which is fastened up the steels should be a machine screw (if not, it causes metal foreign material and deal LCM a fatal blow) (9) Please do not set LCD on its edge.
Ver. 0.1 Apr., 20, 2012 Since a module is composed of electronic circuits, it is not strong to electrostatic discharge. Make certain that treatment persons are connected to ground through wrist band etc. And don’t touch interface pin directly. 9-3. Electrostatic discharge control Strong light exposure causes degradation of polarizer and color filter. 9-4. Precautions for strong light exposure When storing modules as spares for a long time, the following precautions are necessary. (1) Store them in a dark place. Do not expose the module to sunlight or fluorescent light. Keep the temperature between 5°C and 35°C at normal humidity. (2) The polarizer surface should not come in contact with any other object. It is recommended that they be stored in the container in which they were shipped. 9-5. Storage 9-6. Handling precautions for protection film (1) The protection film is attached to the bezel with a small masking tape . When the protection film is peeled off, static electricity is generated between the film and polarizer. This should be peeled off slowly and carefully by people who are electrically grounded and with well ion-blown equipment or in such a condition, etc. (2) When the module with protection film attached is stored for a long time, sometimes there remains a very small amount of glue still on the bezel after the protection film is peeled off. (3) You can remove the glue easily. When the glue remains on the bezel surface or its vestige is recognized, please wipe them off with absorbent cotton waste or other soft material like chamois soaked with normal -hexane.