4-inch round touch TFT LCD

RV040YGP-300-40Active model

4-inch Round Touch TFT LCD Display

A circular 720 × 720 TFT LCD with G+G capacitive touch, a 300 cd/m² typical backlight and RGB interface. Designed for integrated HMI and embedded product interfaces.

LCD size
4.0 inch
Resolution
720 (RGB) × 720 pixels
Viewing direction
All angles
Luminance, typical
300 cd/m²
Touch type
Capacitive
Display interface
RGB
View full specifications ↓
Engineering verification

Temperature values follow the PDF. Published pixel pitch, backlight current and the minimum-luminance entry require engineering confirmation. Confirm the latest mechanical drawing, pinout and driving conditions before integration.

Designed for integration

Product overview.

This 4-inch circular display combines a 720 × 720 pixel matrix with G+G capacitive multi-touch. The LCD active area is 101.52 × 101.52 mm, with an overall module and CTP assembly of 128.75 × 126.75 × 5.75 mm.

The RGB interface and FL7707 display driver need to be matched to the controller board, signal timing and FPC pin assignment. The touch assembly uses a CST3240 controller.

Potential applications include appliance controls, smart-home interfaces, instrument clusters and industrial HMI. Mechanical, electrical and environmental suitability should be checked for the intended device.

Key features

  • Circular 4-inch TFT with a 720 × 720 pixel matrix.
  • All-angle viewing with a Normally Black display mode.
  • G+G capacitive multi-touch with CST3240 controller.
  • 6H surface hardness as published in the specification.
  • LCD-only thickness 2.13 mm; module with CTP thickness 5.75 mm.
  • RGB display interface with a 40-pin signal definition in the datasheet.

Technical reference

Specifications.

Values are model-specific. Review document revisions and any verification notes before integration.

Display

ParameterValueUnitNotes
LCD size4.0inch—
Display modeNormally Black——
Resolution720 (RGB) × 720pixels—
Pixel arrangementRGB vertical stripe——
Viewing directionAll angles——
Display colors16.7M——
Pixel pitch0.18 (H) × 0.18 (V)mmPublished value; confirm against active area and resolution.

Optical

ParameterValueUnitNotes
Luminance, typical300cd/m²PDF minimum luminance entry needs confirmation.
Contrast ratio, typical1200:1——
Contrast ratio, minimum1000:1——
Response time, typical / maximum30 / 35ms—
Viewing angle, typical85 / 85 / 85 / 85°At CR > 10
BacklightWhite LED——

Mechanical

ParameterValueUnitNotes
LCD active area101.52 × 101.52mm—
Touch viewing area102.12 × 102.12mm—
LCD outline (W × L × T)105.6 × 109.87 × 2.13mm—
LCD + CTP outline (W × L × T)128.75 × 126.75 × 5.75mm—

Touch

ParameterValueUnitNotes
Touch typeCapacitive——
Touch structureG+G——
Touch controllerCST3240——
Touch pointsMulti-touch——
Surface hardness6H——

Electrical

ParameterValueUnitNotes
Display interfaceRGB—At Ta = 25°C; verify complete driving conditions in PDF.
Display driver ICFL7707—At Ta = 25°C; verify complete driving conditions in PDF.
Connector pin count40pinsAt Ta = 25°C; verify complete driving conditions in PDF.
Analog supply VCI (min / typ / max)2.6 / 2.8 / 3.3VAt Ta = 25°C; verify complete driving conditions in PDF.
Logic supply IOVCC (min / typ / max)1.65 / 1.8 / 3.3VAt Ta = 25°C; verify complete driving conditions in PDF.
Backlight forward voltage, typical22VAt Ta = 25°C; verify complete driving conditions in PDF.

Environmental

ParameterValueUnitNotes
Operating temperature−30 to +85°CPDF general information; website snapshot flag differs.
Storage temperature−30 to +85°CPer PDF general information.

Interface & pins

ParameterValueUnitNotes
Pin 1LEDA—Backlight positive · PDF interface signals, page 9.
Pin 2–3LEDK—Backlight negative · PDF interface signals, page 9.
Pin 4GND—Ground · PDF interface signals, page 9.
Pin 5VCC—Power 2.8 V · PDF interface signals, page 9.
Pin 6RST—Reset input · PDF interface signals, page 9.
Pin 7–8VCC—Power 2.8 V · PDF interface signals, page 9.
Pin 9SDA (NC)—Not connected · PDF interface signals, page 9.
Pin 10SCK (NC)—Not connected · PDF interface signals, page 9.
Pin 11CS (NC)—Not connected · PDF interface signals, page 9.
Pin 12PCLK—Dot clock for RGB interface · PDF interface signals, page 9.
Pin 13DE—Data enable · PDF interface signals, page 9.
Pin 14VS—Frame synchronization · PDF interface signals, page 9.
Pin 15HS—Line synchronization · PDF interface signals, page 9.
Pin 16–21R0–R5—RGB red data bus · PDF interface signals, page 9.
Pin 22–27G0–G5—RGB green data bus · PDF interface signals, page 9.
Pin 28–33B0–B5—RGB blue data bus · PDF interface signals, page 9.
Pin 34GND—Ground · PDF interface signals, page 9.
Pin 35TP_INT—Touch interrupt · PDF interface signals, page 9.
Pin 36TP_SDA—Touch data · PDF interface signals, page 9.
Pin 37TP_SCL—Touch clock · PDF interface signals, page 9.
Pin 38TP_RST—Touch reset · PDF interface signals, page 9.
Pin 39TP_VCC—Touch power · PDF interface signals, page 9.
Pin 40GND—Ground · PDF interface signals, page 9.

Other

ParameterValueUnitNotes
Datasheet revision01 · 2024-03-29—Confirm latest approved revision before production.

Drawings & technical resources

Product documents.

Before you integrate

Product questions.

Can I connect this module directly to HDMI or USB?

This model has an RGB display interface. An appropriate controller and driver configuration are needed; HDMI or USB compatibility is not implied. Share your board model, timing and pinout for review.

Is the touch panel included?

The published model includes a G+G capacitive touch assembly, CST3240 controller and multi-touch support. Check the touch pin definition and controller requirements against the latest datasheet.

Which temperature information should I use?

The PDF general-information table gives operating and storage ranges of −30°C to +85°C. The website snapshot has a different wide-temperature flag. Confirm the approved specification for your application.

Can the cover glass, backlight or FPC be adapted?

Contact RJY with mechanical constraints, optical and touch requirements, interface and project timeline. Customization feasibility is reviewed for the individual project.

Let’s check the fit

Your application.
Our engineering review.

Share your interface, controller, touch and mechanical requirements for RV040YGP-300-40.

  • Application and operating environment
  • Target board and display interface
  • Touch, brightness and cover-glass requirements
  • Evaluation needs and project timeline
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Engineering reading

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