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Bolymin Complete Solution

Customer Request  

We received a request for a 5″ TFT display that could be used to replace existing LED on a water purifier. While discussing with customer we understood that they are also looking to upgrade their current MCU as it is a low-end one, enough to drive a LED but not good-enough for TFT. 

Upgrading a high-end MCU was a challenge as it had major impact on the product cost. 

Bolymin Suggestion  

We recommend that instead of upgrading their MCU, they should use TFT with RA8875 controller.

We offered them our standard TFT BTC050A-EWR$, that comes with RA8875 Character/ Graphic TFT LCD Controller.

Adding RA8875, also allow customer following functions:

  • Scroll Function
  • PWM (Pulse Width Modulation) for back-light adjustment
  • DMA (Direct Memory Access)  


Bolymin recommendation helped them keep their product within budget without any changes in their current design. In addition, along with TFT Bolymin also design cover lens for the customer. 

It also bring down their product development time by 6~8 weeks.

Bolymin Complete Solution 

Bolymin complete solution includes:


Touch Panel: (RTP/ CTP)

Controller: RA8875 

Cover Lens: (PMMA/ Glass)


 1. Can I store graphic library directly on RA8875 Controller?
Ans: Yes, Graphic Library can be stored into Flash ROM.

 2. Does RA8875 Controller support font?
Ans: Yes, Font IC have built-in support for multi language. 

RA8875 – Important Features

  • Support Text/Graphic Mixed Display Mode
  • Display Type: 256/65K Colors, 800×480 Dots, 6 o’ Clock
  • Support MCU Interface: 8080/6800 with 8/16 BIT, 3/4-wire SPI
  • Embedded 10KB Character ROM with Font Size 8×16 Dots and Supporting Character Sets of ISO/IEC 8859-1/2/3/4
  • Support GB and BIG5 encoding with internal font ROM and font size 16×16 dots.
  • Font enlargement function X1, X2, X3, X4 for Horizontal/Vertical Direction Screen display rotation 90°, 180°, 270° for different panel
  • Block Scrolling Function for Vertical or Horizontal Direction
  • Block Transfer Engine (BTE) Supports with 2D Function. ‹
  • Text cursor for character writing
  • 64×64 pixel graphic cursor
  • Suppor TFT Panel Size:
    • 800×480 Pixels 2 Layers @ 256 Colors
    • 800×480 Pixels 1 Layer @ 64K Colors
  • Support 256 Characters with 8×16 dots
  • Support 32 User-defined Patterns of 8×8 pixels
  • Programmable PWM for Back-Light Adjusting
  • Embedded 4-wire Touch Panel Controller
  • Sleep Mode with Low Power Consumption

What is VATN LCD display?

VATN LCD Display (Vertically Aligned Twisted Nematic) is just another type of LCD (liquid crystal display) module but with a high contrast ratio of 1000:1. It is a negative mode display with a transmissive polarizer.

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