V236H3-LS1 Approval Specification ver 2_1-101207

□ Tentative Specification

□ Preliminary Specification

■ Approval Specification MODEL NO.: V236H3

SUFFIX: LS1

Approved By Checked By Prepared By

Chao-Chun Chung Roger Huang CS Tsai

CONTENTS

1. GENERAL DESCRIPTION (5)

1.1 OVERVIEW (5)

1.2 FEATURES (5)

1.3 APPLICATION (5)

1.4 GENERAL SPECIFICATIONS (5)

1.5 MECHANICAL SPECIFICATIONS (6)

2. ABSOLUTE MAXIMUM RATINGS (7)

2.1 ABSOLUTE RATINGS OF ENVIRONMENT (7)

2.2 PACKAGE STORAGE (8)

2.3 ELECTRICAL ABSOLUTE RATINGS (8)

2.3.1 TFT LCD MODULE (8)

3. ELECTRICAL CHARACTERISTICS (9)

3.1 TFT LCD MODULE (9)

3.2 BACKLIGHT CONNECTOR PIN CONFIGURATION (12)

3.2.1 LED LIGHT BAR CHARACTERISTICS (12)

3.2.2 LIGHTBAR CONNECTOR PIN ASSIGNMENT (13)

3.3 LVDS INPUT SIGNAL SPECIFICATIONS (14)

3.3.1 LVDS DATA MAPPING TABLE (14)

4. BLOCK DIAGRAM OF INTERFACE (15)

4.1 TFT LCD MODULE (15)

5. INTPUT TERMINAL PIN ASSIGNMENT (16)

5.1 TFT LCD MODULE INPUT (16)

5.2 BLOCK DIAGRAM OF INTERFACE (22)

5.3 LVDS INTERFACE (24)

5.4 COLOR DATA INPUT ASSIGNMENT (25)

6. INTERFACE TIMING (27)

6.1 INPUT SIGNAL TIMING SPECIFICATIONS (27)

6.1.1 TIMING SPEC FOR FRAME RATE (F r5 = 100Hz) (27)

6.1.2 TIMING SPEC FOR FRAME RATE (F r6 = 120Hz) (27)

6.2 POWER ON/OFF SEQUENCE (31)

6.2.1 POWER ON/OFF SEQUENCE (Ta = 25 ± 2 oC) (31)

7. OPTICAL CHARACTERISTICS (33)

7.1 TEST CONDITIONS (33)

7.2 OPTICAL SPECIFICATIONS (34)

8. PRECAUTIONS (39)

8.1 ASSEMBLY AND HANDLING PRECAUTIONS (39)

8.2 SAFETY PRECAUTIONS (39)

9. DEFINITION OF LABELS (40)

9.1 CMI MODULE LABEL (40)

10. PACKAGING (41)

10.1 PACKAGING SPECIFICATIONS (41)

10.2 PACKAGING METHOD (41)

11. MECHANICAL CHARACTERISTIC (42)

REVISION HISTORY Version Date Page(New) Section Description

Ver. 0.0 Ver.0.1 Ver.1.0 Ver.2.0 Ver.2.1 Sep. 24,2010

Oct. 08,2010

Oct. 13, 2010

Nov. 11, 2010

Nov. 25, 2010

All

5

5

9

14

18

25

6

12

18

26, 27

All

5

9

15

16, 19

32

33

34

35~38

All

1.1

1.4

3.1

4.1

5.1

6.1

1.5

3.2.1

5.1

6.1

All

1.4

3.1

4.1

5.1

6.2.2

7.1

7.2

7.2

The tentative specification was first issued.

Interface is described with “4ch-LVDS”

Power consumption is modified

Power consumption and power supply current is modified

CNF1 and CN6 are modified

CN6 pin 5, 6 are modified

3D Mode timing is changed

The preliminary specification was first issued

Update weight

Add 3D converter design reference

Note (2)~(8) are modified

Note (7) is added

100Hz timing is added

The Approval specification was first issued

Power consumption is modified

Power consumption and Power supply current are

modified

Delete Pin “LD_EN”

CNF1 pin 6 and CN6 pin 5 , description is modified

New added

New added figure

3D luminance and 3D cross talk are added for reference

Note( ) are modified and added

1. GENERAL DESCRIPTION

1.1 OVERVIEW

V236H3-LS1 is a 23.6” TFT Liquid Crystal Display module with WLED Backlight unit and 4ch-LVDS interface. This module supports 1920 x 1080 Full HDTV format and can display up to 16.7M colors (6 bit +FRC). The converter module for Backlight unit is not built in.

1.2 FEATURES

－Extra-wide viewing angle.

－High contrast ratio.

－Fast response time.

－High color saturation.

－Full HD (1920 x 1080 pixels) resolution.

－DE (Data Enable) only mode.

－LVDS (Low Voltage Differential Signaling) interface.

－RoHS compliance.

－support 120Hz frame rate

1.3 APPLICATION

－Standard Living Room TVs

－MFM Application

－3D Application

1.4 GENERAL SPECIFICATIONS

Item Specification Unit Note Active Area 521.28(H) x 293.22(V) (23.547” diagonal) mm

(1)

Bezel Opening Area 525.22 (H) x 297.22 (V) mm

Driver Element a-si TFT active matrix - - Pixel Number 1920 x R.G.B. x 1080 pixel - Pixel Pitch(Sub Pixel) 0.0905(H) x 0.2715(V) mm - Pixel Arrangement RGB vertical stripe - - Power consumption 21.63W (LVDS input Power 7.8 W + LED Backlight Power 13.83 W) Watt (2) Display Colors 16.7M color - Display Operation Mode Transmissive mode / Normally white - - Surface Treatment Anti-Glare coating (Haze 25%) - (3) Note (1) Please refer to the attached drawings in chapter 9 for more information about the front and back outlines.

Note (2) Please refer sec 3.1 and 3.2 for more information of Power consumption

Note (3) The spec. of the surface treatment is temporarily for this phase. CMI reserves the rights to change this feature.

1.5 MECHANICAL SPECIFICATIONS

Item Min. Typ. Max. Unit Note

Horizontal (H) 544.3 544.8 545.3 mm (1)

Vertical (V) 320.0 320.5 321.0 mm (1) Module Size

Depth (D) 14.1 14.6 15.1 mm (1) Weight - 2550 2650 g - Note (1) Please refer to the attached drawings for more information of front and back outline dimensions.

2. ABSOLUTE MAXIMUM RATINGS

2.1 ABSOLUTE RATINGS OF ENVIRONMENT

Value

Unit Note

Item Symbol

Min. Max.

Storage Temperature TST -20 +60 oC (1)

Operating Ambient Temperature TOP 0 50 oC (1), (2)

Shock (Non-Operating) SNOP - 50 G (3), (5)

Vibration (Non-Operating) VNOP - 1.0 G (4), (5)

Note (1) Temperature and relative humidity range is shown in the figure below.

(a) 90 %RH Max. (Ta ≦ 40 oC).

(b) Wet-bulb temperature should be 39 oC Max. (Ta > 40 oC).

(c) No condensation.

Note (2) The maximum operating temperature is based on the test condition that the surface temperature of display area is less than or equal to 65 oC with LCD module alone in a temperature controlled chamber.

Thermal management should be considered in final product design to prevent the surface temperature

of display area from being over 65 oC. The range of operating temperature may degrade in case of

improper thermal management in final product design.

Note (3) 11 ms, half sine wave, 1 time for ± X, ± Y, ± Z.

Note (4) 10 ~ 300 Hz, 10 min, 1 time each X, Y, Z.

Note (5) At testing Vibration and Shock, the fixture in holding the module has to be hard and rigid enough so that the module would not be twisted or bent by the fixture.

2.2 PACKAGE STORAGE

When storing modules as spares for a long time, the following precaution is necessary.

(a) Do not leave the module in high temperature, and high humidity for a long time, It is highly recommended to

store the module with temperature from 0 to 35 ℃ at normal humidity without condensation.

(b) The module shall be stored in dark place. Do not store the TFT-LCD module in direct sunlight or fluorescent

light.

2.3 ELECTRICAL ABSOLUTE RATINGS

2.3.1 TFT LCD MODULE

Value

Unit Note Item Symbol

Min. Max.

Power Supply Voltage VCCI -0.3 12.6 V

(1)

Logic Input Voltage VIN -0.3 3.6 V

3. ELECTRICAL CHARACTERISTICS

3.1 TFT LCD MODULE

(Ta = 25 ± 2 oC)

Value

Parameter Symbol

Min. Typ. Max.

Unit Note Power Supply Voltage V CC10.8 12 12.6 V (1) Rush Current I RUSH－－ 3.8 A (2)

White Pattern －－ 4.2 5.9 W

Horizontal Stripe －－7.68 10.8 W Power Consumption

Black Pattern －－7.8 11 W

White Pattern －－0.35 0.5 A

Horizontal Stripe －－0.64 0.9 A Power Supply Current

Black Pattern －－0.65 0.91 A

(3)

Differential Input High

Threshold Voltage

V LVTH+100 －－mV

Differential Input Low

Threshold Voltage

V LVTL－－-100 mV

Common Input Voltage V CM 1.0 1.2 1.4 V

Differential input voltage (single-end) |V ID| 200 －600 mV

LVDS

interface

Terminating Resistor R T－100 －ohm

(4)

Input High Threshold Voltage V IH 2.7 － 3.3 V

CMIS

interface

Input Low Threshold Voltage V IL0 －0.7 V

Note (1) The module should be always operated within the above ranges.

Note (2) Measurement condition:

Vcc rising time is 470us

Note (3) The specified power consumption and power supply current is under the conditions at Vcc = 12 V, Ta =

25 ± 2 oC, f v = 120 Hz, whereas a power dissipation check pattern below is displayed.

c. Horizontal Stripe Pattern

Note (4) The LVDS input characteristics are as follows:

b. Black Pattern

Active Area

a. White Pattern

Active Area

3.2 BACKLIGHT CONNECTOR PIN CONFIGURATION

3.2.1 LED LIGHT BAR CHARACTERISTICS

A. 2D/3D=Low level or Open (negative dimming) (Ta = 25 ± 2 oC) Value Parameter Symbol Min. Typ. Max. Unit Note Light Bar Voltage V W 33.6 38.4 42 V (1), Duty=0%, I PIN =60mA LED Current I L 58.2 60 61.8 mA (1), (2) Duty=0% Power consumption

P BL --- 13.83 15.57 W (1) Duty=0%, I PIN =60mA

Life time

-

30,000

- -

Hrs

(3)

B. 2D/3D=High level (negative dimming, reference only) Value Parameter Symbol Min. Typ. Max. Unit

Note Light Bar Voltage

V W

--- 46.8 50.4 V (1), Duty=0%, I PIN =120mA

LED Current I L --- 120 125 mA

(1), (2)

Duty=82% 120Hz

Power consumption

P BL

---

6.1

6.8

W

(1) Duty=82%, I PIN =120mA

Note (1)LED light bar input voltage and current are measured by utilizing a true RMS multimeter as shown

below:

Note (2) P BL = I PIN × V PIN × ( 6 ) input pins , LED light bar circuit is (12)Series, (6)Parallel.

Note (3)The lifetime of LED is defined as the time when LED packages continue to operate under the

conditions at Ta = 25 ±2 and I= (20)mA (per chip) until the brightness becomes 50% of its ℃≦original value.

3.2.2 LIGHTBAR CONNECTOR PIN ASSIGNMENT

Connector: B-F,7083K-F12N-00L ,ENTERY(恩得利),

161035-12041-3 P-TWO (禾昌), GB5DH120-112M-7H,Foxconn(鴻海), or Compatible (1) Input connector pin assignment: CN1

Pin No. Symbol Feature

1 NC Not connection, this pin should be open

2 LED1 Cathode of LED string

3 LED2 Cathode of LED string

4 LED3 Cathode of LED string

5 NC Not connection, this pin should be open

6 VLED (38.4V) VLED

7 VLED (38.4V) VLED

8 NC Not connection, this pin should be open

9 LED4 Cathode of LED string

10 LED5 Cathode of LED string

11 LED6 Cathode of LED string

12 NC Not connection, this pin should be open

3.3 LVDS INPUT SIGNAL SPECIFICATIONS

3.3.1 LVDS DATA MAPPING TABLE

LVDS output D7 D6 D4 D3 D2 D1 D0 LVDS Channel O0

Data order OG0 OR5 OR4 OR3 OR2 OR1 OR0

LVDS output D18 D15 D14 D13 D12 D9 D8 LVDS Channel O1

Data order OB1 OB0 OG5 OG4 OG3 OG2 OG1

LVDS output D26 D25 D24 D22 D21 D20 D19 LVDS Channel O2

Data order DE NA NA OB5 OB4 OB3 OB2

LVDS output D23 D17 D16 D11 D10 D5 D27 LVDS Channel O3

Data order NA OB7 OB6 OG7 OG6 OR7 OR6

LVDS output D7 D6 D4 D3 D2 D1 D0 LVDS Channel E0

Data order EG0 ER5 ER4 ER3 ER2 ER1 ER0

LVDS output D18 D15 D14 D13 D12 D9 D8 LVDS Channel E1

Data order EB1 EB0 EG5 EG4 EG3 EG2 EG1

LVDS output D26 D25 D24 D22 D21 D20 D19 LVDS Channel E2

Data order DE NA NA EB5 EB4 EB3 EB2

LVDS output D23 D17 D16 D11 D10 D5 D27 LVDS Channel E3

Data order NA EB7 EB6 EG7 EG6 ER7 ER6

4. BLOCK DIAGRAM OF INTERFACE

5. INTPUT TERMINAL PIN ASSIGNMENT

5.1 TFT LCD MODULE INPUT

CNF1 Connector Pin Assignment: (FI-RE51S-HF(JAE) or equivalent)

Pin Name Description Note

1 N.C. No Connection

2 N.C. No Connection

3 N.C. No Connection

4 N.C. No Connection

(1)

5 L/R_O Output signal for Left Right Glasses control (7)

6 B/L Output signal for backlight on/off control signal , H: B/L off, L: B/L on

(3D only)

H: +3.3V

L: 0V

7 SELLVDS LVDS Data Format Selection (2)(6)

8 N.C. No Connection

9 N.C. No Connection

10 N.C. No Connection

(1)

11 GND Ground

12 CH1[0]- First pixel Negative LVDS differential data input. Pair 0

13 CH1[0]+ First pixel Positive LVDS differential data input. Pair 0

14 CH1[1]- First pixel Negative LVDS differential data input. Pair 1

15 CH1[1]+ First pixel Positive LVDS differential data input. Pair 1

16 CH1[2]- First pixel Negative LVDS differential data input. Pair 2

17 CH1[2]+ First pixel Positive LVDS differential data input. Pair 2

18 GND Ground

19 CH1CLK- First pixel Negative LVDS differential clock input.

20 CH1CLK+ First pixel Positive LVDS differential clock input.

21 GND Ground

22 CH1[3]- First pixel Negative LVDS differential data input. Pair 3

23 CH1[3]+ First pixel Positive LVDS differential data input. Pair 3

24 N.C. No Connection

25 N.C. No Connection

26 2D/3D Input signal for 2D/3D Mode Selection (3)(5)

27 LR Input signal for Left Right eye frame synchronous (4)(5)

28 CH2[0]- Second pixel Negative LVDS differential data input. Pair 0

29 CH2[0]+ Second pixel Positive LVDS differential data input. Pair 0

30 CH2[1]- Second pixel Negative LVDS differential data input. Pair 1

31 CH2[1]+ Second pixel Positive LVDS differential data input. Pair 1

32 CH2[2]- Second pixel Negative LVDS differential data input. Pair 2

33 CH2[2]+ Second pixel Positive LVDS differential data input. Pair 2

34 GND Ground

35 CH2CLK- Second pixel Negative LVDS differential clock input.

36 CH2CLK+ Second pixel Positive LVDS differential clock input.

37 GND Ground

38 CH2[3]- Second pixel Negative LVDS differential data input. Pair 3

39 CH2[3]+ Second pixel Positive LVDS differential data input. Pair 3

40 N.C. No Connection

41 N.C. No Connection

42 NC No Connection

43 N.C. No Connection (1)

44 GND Ground

45 GND Ground

46 GND Ground

47 N.C. No Connection (1)

48 VCC +12V power supply

49 VCC +12V power supply

50 VCC +12V power supply

51 VCC +12V power supply

CNF2 Connector Pin Assignment (FI-RE41S-HF (JAE) or equivalent)

Pin Name Description Note

1 N.C. No Connection

2 N.C. No Connection

3 N.C. No Connection

4 N.C. No Connection

(1)

5 N.C. No Connection

6 N.C. No Connection

7 N.C. No Connection

8 N.C. No Connection

9 GND Ground

10 CH3[0]- Third pixel Negative LVDS differential data input. Pair 0

11 CH3[0]+ Third pixel Positive LVDS differential data input. Pair 0

12 CH3[1]- Third pixel Negative LVDS differential data input. Pair 1

13 CH3[1]+ Third pixel Positive LVDS differential data input. Pair 1

14 CH3[2]- Third pixel Negative LVDS differential data input. Pair 2

15 CH3[2]+ Third pixel Positive LVDS differential data input. Pair 2

16 GND Ground

17 CH3CLK- Third pixel Negative LVDS differential clock input.

18 CH3CLK+ Third pixel Positive LVDS differential clock input.

19 GND Ground

20 CH3[3]- Third pixel Negative LVDS differential data input. Pair 3

21 CH3[3]+ Third pixel Positive LVDS differential data input. Pair 3

22 N.C. No Connection

23 N.C. No Connection

24 GND Ground

25 GND Ground

26 CH4[0]- Fourth pixel Negative LVDS differential data input. Pair 0

27 CH4[0]+ Fourth pixel Positive LVDS differential data input. Pair 0

28 CH4[1]- Fourth pixel Negative LVDS differential data input. Pair 1

29 CH4[1]+ Fourth pixel Positive LVDS differential data input. Pair 1

30 CH4[2]- Fourth pixel Negative LVDS differential data input. Pair 2

31 CH4[2]+ Fourth pixel Positive LVDS differential data input. Pair 2

32 GND Ground

33 CH4CLK- Fourth pixel Negative LVDS differential clock input.

34 CH4CLK+ Fourth pixel Positive LVDS differential clock input.

35 GND Ground

36 CH4[3]- Fourth pixel Negative LVDS differential data input. Pair 3

37 CH4[3]+ Fourth pixel Positive LVDS differential data input. Pair 3

38 N.C. No Connection

39 N.C. No Connection

40 GND Ground

41 GND Ground

CN6 Connector Pin Assignment (LM123S-010-H-TF1-3 (UNE) or equivalent)

1 N.C. No Connection

2 N.C. No Connection

3 N.C. No Connection

4 GND Ground

5 B/L Output signal for backlight on/off control signal , H: B/L off, L: B/L on

(3D only)

H: +3.3V

L: 0V

6 L/R_O Output signal for Left Right Glasses control (7)

7 N.C. No Connection

8 N.C. No Connection

9 N.C. No Connection

10 N.C. No Connection

Note (1) Reserved for internal use. Please leave it open.

Note (2) LVDS format selection.

L= Connect to GND , H=Connect to +3.3V or Open

SELLVDS Note

L JEDIA Format

H or Open VESA Format

Note (3) 2D/3D mode selection.

L= Connect to GND or Open, H=Connect to +3.3V

2D/3D Note

L or Open 2D Mode

Note (4) Left Right synchronous signal for glasses.

V IL=0~0.8 V, V IH=2.0~3.3 V

LR Note

L Right synchronous signal

H Left synchronous signal

Note (5) 2D/3D, and LR signal pin connected to the LCM side has the following diagram.

R1 in the system side should be less than 1K Ohm. (R1 < 1K Ohm)

Note (6) SELLVDS signal pin connected to the LCM side has the following diagram.

R1 in the system side should be less than 1K Ohm. (R1 < 1K Ohm)

Note (7) The definition of L/R_O signal as follows

L= 0V , H= +3.3V

L/R_O Note

L Right glass turn on

H Left glass turn on

高考英语概要写作33990

上海高考英语题型训练：概要写作 概要写作是在正确理解文章的基础上，在不改变原文的中心思想，体裁和结构的 前提下，省去细节，用简明、精炼的语句高度浓缩地概况文章的主要内容和观点。 注意只需要用不同语言复述原文主旨，不能加入自己的观点。 I helped an old man in rags who lost his way, Main point: I helped an old man. Details: in rags, who lost his way. 概要写作是阅读理解和书面表达的沟通桥梁，考查的是学生在实现自由的思维表 达之前，对他人的信息在理解的基础上进行概括表达的能力。选材上，提供一篇350词以内的短文，题材不限，一般以议论文说明文或者记叙文为主，要求考生 写出一篇60词以内的内容概要。完成一篇概要写作，需要经过三个步骤。 1，读懂原文，找出段落主题句，概况全文中心思想。在阅读过程中，需要准确 把握文章的段落大意，剔除非重要信息，弄清楚不同体裁的文章的内部逻辑关系 以及文章的篇章结构。 2，组织语言，对主题句和中心思想同义替换表达。在转换改写中，注重语言表 达的独立性和准确性以及高级性，不照抄原文句子，尽量用自己的语言转换表达， 同时要注意篇幅的比例安排，用较多的文字去表达重要的内容。 3，找出恰当的关联词，连贯全文。要牢记各段落要点之间的逻辑关系和自然衔接，关注文章内部逻辑，关注一切有转承关系的连接词，尤其是一些副词， 比如，however, besides, in addition, therefore, instead等。 为写好概要写作，在平时的阅读中，应注意： 1，培养抓中心句、概况中心思想的习惯。 2，掌握句型转换方法，学会用不同的语法结构表达同一个主题。 3，积累同义替换词和连接词。 Summary Writing Direction: Read the following passage. Sammarize the main idea and the main point(s) of the passage in no more than 60 words. Use your own words as far as possible. Unit 1, A remarkable variety of insects live in this planet. More species of insects exist than all other animal species together. Insects have survived on earth for more than 300 million years, and may possess the ability to survive for millions more. Insects can be found almost everywhere -- on the highest mountains and on the bottom of rushing streams, in the cold South Pole and in bubbling hot springs. They dig through the ground, jump and sing in the trees, and run and dance in the air. They come in many different colors and various shapes. There are many reasons why insects are so successful at surviving. Their amazing ability to adapt permits them to live in extreme ranges of temperatures and environments. The one place they have not yet been found to any major extent is in the open oceans. Insects can survive on a wide range, of natural and artificial foods—paint, pepper, glue, books, grain, cotton，other insects, plants and animals Because they are small they can hide in tiny spaces. Also, insects have an enormous reproductive capacity: An African ant queen can lay as many as 43,000 eggs a day.

(完整)浙江新高考英语作文概要和续写(20200518215850)

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Exercise 1 With only two weeks to go before Christmas, buying presents is a high priority for a lot of people. However, this year not so many people are leaving their homes to go shopping. These days lots of people can do their shopping in the comfort of their own home with the help of the Internet. Online shopping is becoming more and more popular for a number of reasons: prices are often lower online; you don’t have to queue up in busy shops and you can buy almost any product imaginable with just a few clicks of your mouse. Both male and female are buying into the trend, but women are expected to do more shopping on the Internet than men. It seems women are now more attracted to the convenience of online shopping than they used to be. Average spending online this Christmas by women will rise to ￡ 240 (3.360 yuan) compared to the slightly lower average of ￡ 233 (3,262 yuan) for men. In the past a lot of people were reluctant to shop online. Many were worried about the security of entering their card details on the Internet and the reliability of the Internet but as shopping online has become more widespread, these worries have begun to disappear. 45% of Internet users still do have security worries but it hasn’t slowed down the ever-increasing numbers of online shoppers. One victim of the online shopping boom is the UK high street. The average spending per person on the high street is only ￡197. 70% of Internet users who are now buying their Christmas gifts online. 参考范文： This year, people are doing Christmas shopping online at home rather than leave their homes for cheaper goods and more convenience.(要点1) With increasing popularity of online shopping, women spend more than men.(要点2) Although safety is a major concern for shopping online,still more and more people choose to shop online.(要点3) With the pressure from widespread online shopping, traditional shops in the UK high street began their sales promotion earlier this Christmas.(要点4) 分析过程： 一、试题详解

概要写作参考范文

概要写作参考范文 People hold mixed opinions towards dirt on our skin.（要点1: 5分）In the 16th century, people of some European countries, believed that dirt protected people from getting ill.（要点2: 6分）However, People began to change their attitudes to dirt more than 200 years ago. They have been told that washing dirt off our body can keep us healthy. (要点3：8分) Nevertheless, nowadays, some scientists believe that exposure to some dirt may help our immune system. (要点4: 6分) People hold mixed opinions towards dirt on our skin.（要点1: 5分）In the 16th century, people of some European countries, believed that dirt protected people from getting ill.（要点2: 6分）However, People began to change their attitudes to dirt more than 200 years ago. They have been told that washing dirt off our body can keep us healthy. (要点3：8分) Nevertheless, nowadays, some scientists believe that exposure to some dirt may help our immune system. (要点4: 6分) People hold mixed opinions towards dirt on our skin.（要点1: 5分）In the 16th century, people of some European countries, believed that dirt protected people from getting ill.（要点2: 6分）However, People began to change their attitudes to dirt more than 200 years ago. They have been told that washing dirt off our body can keep us healthy. (要点3：8分) Nevertheless, nowadays, some scientists believe that exposure to some dirt may help our immune system. (要点4: 6分) People hold mixed opinions towards dirt on our skin.（要点1: 5分）In the 16th century, people of some European countries, believed that dirt protected people from getting ill.（要点2: 6分）However, People began to change their attitudes to dirt more than 200 years ago. They have been told that washing dirt off our body can keep us healthy. (要点3：8分) Nevertheless, nowadays, some scientists believe that exposure to some dirt may help our immune system. (要点4: 6分) People hold mixed opinions towards dirt on our skin.（要点1: 5分）In the 16th century, people of some European countries, believed that dirt protected people from getting ill.（要点2: 6分）However, People began to change their attitudes to dirt more than 200 years ago. They have been told that washing dirt off our body can keep us healthy. (要点3：8分) Nevertheless, nowadays, some scientists believe that exposure to some dirt may help our immune system. (要点4: 6分) People hold mixed opinions towards dirt on our skin.（要点1: 5分）In the 16th century, people of some European countries, believed that dirt protected people from getting ill.（要点2: 6分）However, People began to change their attitudes to dirt more than 200 years ago. They have been told that washing dirt off our body can keep us healthy. (要点3：8分) Nevertheless, nowadays, some scientists believe that exposure to some dirt may help our immune system. (要点4: 6分) People hold mixed opinions towards dirt on our skin.（要点1: 5分）In the 16th century, people of some European countries, believed that dirt protected people from getting ill.（要点2: 6分）However, People began to change their attitudes to dirt more than 200 years ago. They have been told that washing dirt off our body can keep us healthy. (要点3：8分) Nevertheless, nowadays, some scientists believe that exposure to some dirt may help our immune system. (要点4: 6分)