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URL: 

www.topwaydisplay.com 

                                                                                                                                                            Document 

Name: HMT028ATB-C-Manual-Rev0.3 

Page:  1  of    14 

 

 
 
 
 

 

 
 
 
 
 
 
 
 

HMT028ATB-C

 

LCD Module User Manual

 

 

 
 
 
 
 
 
 

Prepared by: 
 
 

Gong huimei

 

Checked by: 

Approved by: 

Date: 2022-07-27 

Date: 

Date: 

 

 
 
 

 

Rev.

 

Descriptions

 

Release Date

 

0.1

 

- Preliminary Draft release

 

2019-05-10

 

0.2

 

-Update Electrical Characteristics

 

2020-07-16

 

0.3

 

-Update Optical Characteristics

 

2022-07-27

 

 

 

 

 

 

 

 

 

 

 

 

 

Summary of Contents for HMT028ATB-C

Page 1: ... 14 HMT028ATB C LCD Module User Manual Prepared by Gong huimei Checked by Approved by Date 2022 07 27 Date Date Rev Descriptions Release Date 0 1 Preliminary Draft release 2019 05 10 0 2 Update Electrical Characteristics 2020 07 16 0 3 Update Optical Characteristics 2022 07 27 ...

Page 2: ... 1 2 Block Diagram 3 1 3 Terminal Function 4 2 Absolute Maximum Ratings 5 3 Electrical Characteristics 5 3 1 DC Characteristics 5 4 Function Specifications 6 4 1 Basic Operation Function Descriptions 6 4 2 Quick Start Guide 7 4 3 Command Descriptions 7 5 Optical Characteristics 8 6 LCD Module Design and Handling Precautions 10 7 CTP Mounting Instructions 11 8 RTP Mounting Instructions 12 ...

Page 3: ...olor display content eg pure red pure green pure blue or pure colors combinations 2 For color scales display content 3 Color tone may slightly change by Temperature and Driving Condition 4 Seetion 1 3 for configuration 1 2 Block Diagram Screen Size Diagonal 2 8 Resolution 320 x 240 RGB Color Depth 65k color 16bit Pixel Configuration RGB Stripe Display Mode Transmissive Normal White Viewing Directi...

Page 4: ...ce Terminal K2 Pin No Pin Name I O Descriptions 1 2 3 VDD P Power supply 5 0 V 4 NC No connection leave open 5 RX I Data Input eg to Host MCU s UART TXD 6 TX O Data output eg to Host MCU s UART RXD 7 BUSY O Request To Send function as busy BUSY signal 1 Busy 0 No busy eg to Host MCU IO check before sending data or command 8 9 10 VSS P Ground 0V Note 1 User data and commands transfer through this t...

Page 5: ...lity is determined at the room temperature TOP 25 3 Ambient temperature when the backlight is lit reference value 4 Any Stresses exceeding the Absolute Maximum Ratings may cause substantial damage to the device Functional operation of this device at other conditions beyond those listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliability 3 ...

Page 6: ...the interface flow and the touch response are based on the preloaded files VP variables memory is inside RAM area it provides real time access via UART by the HOST or display onto the TFT Custom Memories are inside FLASH memory area It can be accessed via UART interface by the HOST Control and Draw Engine executes HOST commands and response respectively It also reports the real time Touch Key numb...

Page 7: ...Name HMT028ATB C Manual Rev0 3 Page 7 of 14 4 2 Quick Start Guide 1 Install TOPWAY Graphics Editor 2 Import pictures design UI flow 3 Download to Smart LCD 4 power on display 5 Connect to host Show real time data 4 3 Command Descriptions Please refer to SMART LCD Command Manual ...

Page 8: ...atio CR θ 0 400 500 Note 4 Response Time TON 25 20 30 ms Note 5 TOFF Chromaticity White x Backlight is on 0 218 0 268 0 318 Note 1 6 y 0 234 0 284 0 334 Red x 0 58 0 630 0 68 Note 1 6 y 0 284 0 334 0 384 Green x 0 281 0 331 0381 Note 1 6 y 0 562 0 612 0 662 Blue x 0 099 0 149 0 199 Note 1 6 y 0 013 0 063 0 113 Uniformity U 75 80 Note 1 2 NTSC 60 65 Note 1 6 Luminance L 160 200 cd Note 1 Note The p...

Page 9: ...x 100 Bp Max Maximum brightness in 9 measured spots Bp Min Minimum brightness in 9 measured spots Note 3 The definition of viewing angle Refer to the graph below marked by θ and Ф Note 4 The definition of contrast ratio Test LCM using PR 705 Contrast Ratio CR Luminance When LCD is at White state Luminance When LCD is at Black state Contrast Ratio is measured in optimum common electrode voltage Not...

Page 10: ...mum anti static working environment to protect the LCD module eg ground the soldering irons properly Be sure to ground the body when handling LCD module Only hold LCD module by its sides Never hold LCD module by applying force on the heat seal or TAB When soldering control the temperature and duration avoid damaging the backlight guide or diffuser which might degrade the display result such as une...

Page 11: ...port bracket for backside support when necessary e g slim type TFT module without mounding structure They should only provide appropriate support and keep the module in place The mounting structure should be strong enough to prevent external uneven force or twist act onto the module 液晶屏表面带有保护膜 揭除保护膜时需要注意可能产 生的静电 因液晶显示屏表面的偏光片极易划伤 安装完成之前请 尽量不要揭下保护膜 请缓慢揭除保护膜 在此过程中液晶显示屏上可能会产 生静电线 此为正常情况 可在短时间内消失 请注意避免...

Page 12: ...0 2 0 3mm 间隙 玻璃盖板视窗应大于 CTP 动作区域 各边离动作区应 0 5mm 建议必要时在背面提供附加支架 例如无安装结构的薄型 TFT 模块 应仅利用适当支撑以保持模块位置 安装结构应具有足够的强度 以防止外部不均匀力或扭 曲力作用到模块上 Figure 3 8 RTP Mounting Instructions It should bezel touching the RTP Active Area A A to prevent abnormal touch It should left gab D 0 2 0 3mm in between Figure 4 8 电阻触摸屏安装指导 为避免面框直接压在动作区 A A 上造成误动作 面框与 电阻触摸屏 RTP 之间应留有一定的空隙 D 0 2 0 3mm 之 间 附图 4 Outer bezel design should ...

Page 13: ...d in any of the above applications we will need to enter into a separate product liability agreement We cannot accept responsibility for any defect which may arise form additional manufacturing of the product including disassembly and reassembly after product delivery We cannot accept responsibility for any defect which may arise after the application of strong external force to the product We can...

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