TVLogic LVM-403 Calibration Overview
The LVM-403 is a 40-inch professional LCD monitor from TVLogic, designed for broadcast and post-production applications. It features a native 1920 x 1080 resolution, a contrast ratio of 1000:1 and a wide viewing angle of 178 degrees, ensuring consistent image quality across different viewing positions.
The TVLogic LVM-403 was a staple choice in the professional display market, used for color work, on-set monitoring or editorial tasks.
Below is an overview of the display's performance before and after professional TVLogic LVM-403 calibration.
A 3D LUT calibration was done and the resulting cLUT was then activated in DaVinci Resolve as a monitoring LUT, the LVM-403 does not have internal LUT storage.
At time of calibration, the unit was 10 years old with an estimated 25,000 hours of usage.
This calibration is another example how professional display calibration can restore old, out-of-spec displays, making them usable again in color or editorial workflows.
Equipment, software and target used in the calibration:
- Calibration software: DCM
- Colorimeter: K-10-A
- Spectro: CR-300
- Patch generator: DaVinci Resolve, SDI out
- Calibration target: Rec 709 D65 G2.4 100 nits (SDR)
- LUT holder: DaVinci Resolve 33^3 (tetrahedral)
Native Gamut
This is the native gamut (before calibration) of the TVLogic LVM-403 compared to the Rec 709 color
space calibration target. The display's native gamut barely covers the target color space.
The white point was calibrated manually using the display's CMS gain and bias controls.
RGB Balance
This is the greyscale RGB balance before LUT calibration. The greyscale was manually calibrated using the display's CMS gain and bias controls.
EOTF: Gamma
This is the native gamma and luminance response of the TVLogic LVM-403. The reference line is configured for the calibration target of G2.4. In its default native state, the display is too dark in the shadows and too bright in the mid-tones and highlights.
Spectrum Analysis
This is the spectrum of the TVLogic LVM-403 in native gamut for full white, with the red, green and blue primaries
spectral output overlaid to identify color channel issues. The R, G, B color channels match the white response well, this is ideal.
Notice the spiky spectral response and narrow peaks, a high-end spectrometer is needed to measure this panel accurately.
Calibration
After display preparation and configuration, a large display profile is run to create a detailed characterization of the display. From that profile data, a 3D LUT is then generated by DCT and activated in Davince Resolve as a monitoring LUT with tetrahedral interpolation (most accurate).
Gamut & White Point (post)
Gamut (post calibration) compared to the Rec 709 D65 target - both color space and white point are on target.
RGB Balance (post)
This is the Greyscale RGB balance post-calibration, excellent result.
EOTF: Gamma (post)
This is the gamma and luminance response of the TVLogic LVM-403 after calibration compared to the reference calibration target G2.4. The display now tracks the reference very closely - performance in the shadows will always be a bit compromised on LCD monitors, due to the backlight.
Color Error: delta E 2000 (post)
These are the dE 2000 stats post calibration for a 1,100 point stress test validation profile. With an average dE
2000 color error of only 0.70, the TVLogic LVM-403 now performs very well given that the JND (just noticeable
difference) for human vision is set at a dE 2000 value of 2.3.
All 44 points with a dE 2000 > 2 are in the shadows, the higher color error is caused by the LCD backlight.
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