OBM-X Series Overview

The Postium OBM-X Series are our most advanced displays for UHD/4K HDR Grade 1 and Grade 2 Reference monitoring. The 31” OBM-X310 is a Grade 1 monitor that either meets or exceeds all required HDR mastering format specifications for luminance, color gamut and bit depth for current HDR mastering formats such as Dolby Vision, HDR10 and HDR10+, HLG and others.  The 24” OBM-X241 is a Grade 2 display for QC and HDR production monitoring. Both the OBM-X310 and the OBM-X241 utilize native 4096×2160 LCD panels with a maximum HDR luminance of 1000 nits.

The unique dual cell panel structure of the OBM-X310 allows for light output modulation at an individual pixel level. This panel structure eliminates pixel light leakage to adjacent pixels that often results in a “halo effect” and allows for uniform gradation of grayscale and color with black level details that are highly accurate and free from visible artifacts related to imprecise local-dimming pixel luminance errors.

Both the OBM-X310 and the OBM-X241 are equipped with standard 12G/6G/3G-SDI input interfaces (x2) and HDMI 2.0 input and support both 4K Quad Link 2-Sample Interleave and 4K Quad Link Square Division signals via SDI and SFP and accepts up to 3840×2160/24,25,30,50,60p and 4096×2160/24.25.30,50,60p signals.

Display Functions

Wide Color Space Support including DCI-P3 and ITU-R BT.2020 is controlled with an advanced 3D LUT (Look Up Table) to reproduce various color spaces accurately with smooth, artifact-free grayscale steps.

Available color gamuts are DCI-P3, ITU-R BT.2020, ITU-R BT.709, SMPTE-C, EBU, and Native.

High Dynamic Range (HDR) Mode displays HDR images up to 1000 cd/m² max luminance with no black level variances or light bleed from adjacent lit pixels (OMB-X310 only). The OBM-X Series supports PQ EOTF (SMPTE ST 2084), Hybrid Log Gamma and S-Log3. Postium’s HDR function allows users to view both highlights and shadow details within scenes simultaneously, thus resulting in more natural and realistic reproduction.

SDR/HDR Display modes provide both full-frame HDR and SDR viewing as well as simultaneous side-by-side split screen comparison.

Color Space / Dynamic Range / Gamma Comparison (Side by Side, Wipe position) allows users to compare different color spaces, gammas, HDR / SDR, camera logs, and other color settings side by side simultaneously. The comparison area can be selected and moved with a vertical wipe pattern.

3D Look-up Table import is supported for accurate and consistent color matching between individual displays as well as using customized ‘looks’ that have been created by 3rd party color-grading applications. 32ˆ³, 33ˆ³, 64ˆ³, 65ˆ³ cube file are supported.

In addition, the OBM-X series has Built-in Camera Log to Linear conversion LUTs from various camera manufacturers including Log-C, C-Log / S-Log2, S-Log3 / J-Log1 and more.

The LUT-converted content can then be output to downstream devices/monitors via the SDI loop out.

False Color indicates the Luma (Y) level of the input image. If a certain Y level is set, the pixels with the designated Luma (Y) level are displayed with a zebra pattern or a color pattern. There are display modes – Zebra, Variable, ARRI, and Comparison.

Gamut Error Type can be observed in 3 modes. In Type 1, when the targeted color space is selected as BT.709, the pixels outside of the targeted color space are displayed as Black Zebra.

The pixels over Y Maximum, Chroma Maximum, RGB Maximum are displayed as Black Zebra, and the pixels below Y Minimum, Chroma Minimum, RGB Minimum are also displayed as Black Zebra.

In Type 2, when the targeted color space is selected as BT.709, the pixels outside of the targeted color space are displayed as Black or White Zebra.

The pixels over Y Maximum, Chroma Maximum, RGB Maximum are displayed as Black Zebra, and the pixels below Y Minimum, Chroma Minimum, RGB Minimum are displayed as White Zebra.

In Type 3: Mono, when the targeted color space is selected as BT.709, the pixels inside of the targeted color space are displayed as Mono, and the pixels outside of the targeted color space are displayed as the color. In this type, black and white area is not recognized.

Input Signal Format Support

12G-SDI over IP Supporting ST 2022-6 is supported with dual SFP Input cages, which enable the OBM-X310 to accept and display Quad-Link square division and 2-Sample Interleave 4K signals over IP supporting SMPTE ST 2022-6.

Single Link 4K/12G

Dual Link 2-Sample Interleave (2SI) up to 2160/60p.

Quad Link 2 Sample Interleave (2SI) uses four ¼ resolution full-frame sub-images and alternates the samples every two pixels and every line rather than splitting the image into four quadrants.

Quad Link Square Division. Each link contains one quarter square of the original image.

Black Stretch increases visibility in dark areas without degradation of image quality in bright areas. This mode can be used to increase shadow detail without changing absolute black level and without affecting mid-tones.

4K HDR Waveform Monitor and Vector Scope Display modes enable users to monitor sources using the internal Waveform and Vector Scope individually or simultaneously.

The position of Waveform and Vector Scope can be moved between Top Left, Top Right, Bottom Right, and Bottom Left.

When HDR mode is set on, HDR Waveform is displayed on screen.

Adjustable Gamma control allows for incremental compensation between gamma correction values of 1.0 and 3.0 — thereby ensuring that the decoded image isn’t too bright (no gamma correction) or too dark (over correction).

Various Frame Markers/Mattes are available on the OBM-X series, including aspect, area, and center markers. In addition, the detailed display settings of each marker are allowed. For example, the color, brightness, horizontal/vertical position, and thickness of aspect markers can all be adjusted.