2.3 Mega-Pixel 24.1" color display with DICOM calibration function. (Model: CCL240)

2.3 Mega-Pixel 24.1" color display with DICOM calibration function. (Model: CCL240)

2.3 Mega-Pixel 24.1" color display with DICOM calibration function. (Model: CCL240)

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24.1" wide-screen color LCD with DICOM calibration function
High luminance, high contrast, and wide viewing angle provided by the IPS panel Stable luminance for a long period of time with a unique built-in luminance stabilizing circuit.


Wide-screen display with 1920 x 1200 pixels
Provides display area large enough, especially to show multiple windows at a time for using medical image analysis software

Calibrates luminance and gamma to enable smooth grayscale display that is faithful to DICOM GSDF.Color calibration function to reproduce colors faithful to the original and grayscale compliant with DICOM Part 14
By calibrating color temperature, luminance, and gamma characteristics, reproduction of colors faithful to the original and smooth display of grayscale are possible.

Calibration function to accurately adjust gamma, color temperature, and luminance
Medical image displays are commonly required to display grayscale according to the Grayscale Standard Display Function (GSDF) defined by DICOM Part 14. The calibration function creates the optimum conditions for a medical imaging display by adjusting luminance levels, color temperature, and grayscale characteristics to achieve DICOM GSDF compliant grayscale output.

Models supported: All ME/CCL Series models, except ME183L and CCL192 plus
Note: Calibration requires an optional calibration kit*

How it works
The calibration function corrects the driving level of the LUT (Look-up Table), a memory that specifies the LCD driving, and writes it in the LUT. In other words, calibration adjusts grayscale characteristics, color temperature (color displays only), and luminance.

The luminance for each driving level is corrected such that the resulting curve matches the DICOM GSDF achieving smooth grayscale output.

The luminance for each driving level is corrected such that the resulting curve match the DICOM GSDF and smooth grayscale is achieved.

Graph is for explanatory purpose only.

* Calibration kit (optional)
Package contents
  • Calibration software: Medivisor for i2 Series, Medivisor Grayscale, Medivisor Color, Medivisor for ME201L/ME181L
  • QA Medivisor
  • Utility Software for i2 Series
  • GSDF Checker
  • Luminance sensor

Newly developed luminance stabilizing system λ-Sentinel IIAutomatically corrects and luminance fluctuation due to startup drift, temperature change, and aging to provide stable luminance.

Luminance stabilizing system to provides continuous stable display for medical images

A change in luminance affects gamma characteristics and therefore has adverse effects on diagnostic imaging. TOTOKU'smedical image displays are equipped with a luminance stabilizing system that automatically compensates for luminance changes due to startup drift, temperature change, and aging.

Luminance stabilizing system λ-Sentinel

λ-Sentinel II Luminance stabilizing system λ-Sentinel II

λ-Sentinel II consists of a luminance sensor and a luminance control circuit. The luminance sensor attached in front of the screen constantly monitors and accurately stabilizes luminance on the screen surface by sending feedback to the control circuit.

Newly developed luminance stabilizing system λ-Sentinel IILuminance sensor
  • With luminance fluctuation caused by the LCD module taken into account, highly accurate luminance control is achieved.
  • Actual luminance measurements including intermediate luminance are taken on the screen surface.
  • Build-in luminance sensor provided with i2 models enables even simpler calibration without attaching the calibration sensor.

Note: λ-Sentinel II module is built into the the ME/CCL Series i model displays. Other models are equipped with λ-Sentinel (TOTOKU's conventional system).

Simultaneous display of 1276 shades of grayBuilt-in 10bit LUT (Look-up Table) to reproduce beautiful grayscale
The built-in LUT selects the most appropriate 256 shades of gray (8bit) out of 1021 shades (10bit) to realize finer and smoother grayscale..

Built-in LUT (Look-up Table) to reproduce beautiful grayscale and TOTOKU's technology for simultaneous display of multiple shades
General-purpose displays are capable of 256 shades of gray, but due to unevenness and grayscale discontinuity, they cannot reproduce and display the subtle shading difference required for medical image displays. TOTOKU's medical image displays display the most appropriate 256 shades (8bit) out of a maximum of 12241 shades of gray using the built-in LUT. This technology realizes much finer and smoother grayscale than possible with general-purpose displays.

Moreover, combining with a TOTOKU display customized conversion table with an integrated viewer, up to 2048 shades of gray can be provided to produce film-like images on the display.

DICOM GSDF compliant curves according to the number of simultaneously available gray shades

DICOM GSDF compliant curves by the number of simultaneously available gray shades

* Images are provided for explanatory purposes only.

High image quality provided by the IPS panel
The IPS panel is effective in preventing color and contrast changes caused by different viewing angles.

Special AR coating
Totoku's new *Special AR Coating technology addresses properties of focus, noise reduction, contrast, and viewing angle achieving film-like black and accurate reproduction of images. In this paper, we describe its features and physical measurement results.
*Patent pending

Conventional LCD surface treatment
To reduce background appearances on the screen by reflection, the surface of medical displays is generally Anti- Glare (AG) coated. However, the AG coating causes focus loss due to diffused reflection and increased noise because of the diffused light that overlaps with the displayed images. For this reason, some displays used in diagnostic imaging require such finite depiction, that radiologists prefer a non- AG coated display, sacrificing reflective benefits, but gaining a crisper image.
Proper focus and noise properties conflict with reduction of specular reflection, and a development of an LCD surface treatment that meets the both demand was desired.

Table1 Mechanism and features of each LCD surface treatment
*The images explain general ideas of each mechanism and may be different from the actual structures.

AG coating
AG + AR filter
Special AR coating
AG + ARフィルター
Beads of about 4µm in diameter diffusely reflect the light to reduce background appearances mirrored on the screen. However, transmitted light (Displayed image) is also diffusely reflected causing focus loss and increased noise.
An AR filter is attached indirectly to an AG-coated LCD panel across the layer of air. This improves contrast ratio of images.
The special AR coating reduces diffuse reflection and improves properties of noise, focus, contrast and viewing angle.

Special AR Coating

The special Anti-Reflection (AR) coating is a surfacetreatment that provides AR layers directly on a LCD panel as shown in Table 1.
Fig. 1 shows comparison of micro bright points displayed on the special AR-coated LCD and the AG-coated LCD. Due to the reduced diffused reflection by the special AR coating, the bright point is displayed more clearly with the improved focus and contrast compared to the one on the AG-coated LCD.

Fig.1 Illustration of the displayed micro bright points

Physical measurement results of the display properties
Table 2 shows physical measurement results of the display properties. The special AR-coating obtained the best results in the three surface treatments for all the measurement items except for the specular reflection (Rs).
Table2 Measurement results in each surface treatment
Max. luminance
(Dark room)
Min. luminance
(Lighted room)
Contrast ratio
Reflection coefficient
*Viewing angle (Left - Right)
Dark room
Lighted room
Rs (Specular)
Rd (Diffuse)
AR coating


AG + AR filter


AG coating


• A 3MP display was used in the measurement
• The measurement was performed in a relative manner where AG + AR filter is 100.
   (The bigger values indicate the better properties.)
*The viewing angle was measured in accordance with AAPM TG18.
   (The specified viewing angles indicate where the contrast ratio of over 170 is achieved.)

Fig.2 Noise characteristics (NPS characteristics)
The noise level of the special AR coating is lower than the AG coating.

Fig.3 Focus (MTF characteristics)
The special AR coating achieved the higher focus properties than the AG coating.

Specular reflection characteristics
Fig. 4 shows photographs of each LCD with 4 different surface treatments reflecting the background in the lighted room. Fig. 5 shows image analysis of the photographs in Fig. 4. The X-axis represents the horizontal direction in the photographs and the Y-axis represents relative luminance.
A piece of white paper was placed in front of the surface of each LCD panel to take a photo of its appearance on the screen by reflection.
Although the paper edge appears more clearly on the special AR-coated LCD than the AG-coated LCD or the AG-coated LCD with the AR filter, as shown in Fig. 5, relative luminance of the special AR-coated LCD is lowest. Conversely, the white paper appears most clearly on the mirror-shiny surface of the *Glare type LCD, and its relative luminance is the highest of all LCDs.
*Non-AG-coated LCD panel to improve the noise and the focus properties.

Fig.4 Comparison of the background reflected on the screen in the lighted room

Fig. 5 Graph of the photograph analysis

The special AR-coating obtained the best results in the three surface treatments for all the testing items except for the specular reflection (Rs). Although the reflection coefficient in the specular reflection is slightly lower than the others, as shown in Fig. , the special AR-coated LCD achieves the lowest relative luminance of the reflected image.
For these reasons, it was indicated that the special AR-coating is the surface treatment best suited for medical displays.

Allows you to have the second window on the screen.

Worldwide medical safety standards Worldwide medical safety standards
This display is certified under various medical safety standards that are much more demanding than those for general-purpose IT equipment.


Model Name
CCL240 (Without Special AR Coating)
CCL240 /AR (With Special AR Coating)
LCD Panel Technology 24.1-inch, Color, IPS Technology
Display Area 518mm x 324mm
Pixel Pitch 0.27mm x 0.27mm
Contrast Ratio 1000:1 (typ)
Maximum Luminance 400cd/m² (typ)
(calibrated to 150cd/m2 and 200cd/m2, 150cd/m2 by factory default)
Viewing Angle 178° horizontal and vertical (typ)
Visual Performance Available Resolution 1920 x 1200
Color Display Full color (16.77 million colors)
Input Signal Input Sync Signal Digital DVI / Analog RGB
Plug and Play DDC2B compliant
Input Power Supply Input 100V-240V (-10%, +10%) 50/60Hz (Internal power supply)
Maximum Power Consumption 110W (typ), (with power management feature)
Features Calibration Control Luminance, Gamma, Color temp. (A calibration kit is required.)
Standards MET (UL60601-1), MET-C (CSA C22. 2 No 601. 1), MDD/CE, FCC-B, VCCI-B, (FDA510(k): pending)
Physical Characteristics Dimensions (WxHxD) 561 (W) X 467 / 529 (H) X 220 (D) mm
Weight Net: approx. 11.7kg, Without tiltstand: approx. 7.3kg
Tilt Stand Tilt, swivel, landscape/portrait rotation
Mount 100mm VESA compliant
Security Slot Antitheft security slot
Accessories 3P power cord, DVI cable, VGA cable, User manual