Sunday, January 22, 2017

LG OLED65B7P vs OLED65E7P

The picture quality is mostly identical, meaning the LG OLED65B7P and OLED65E7P differ in their design, and to a lesser extent: sound capabilities. The OLED65B7P is the 65-inch class model in the B7 series of LG OLED TVs whereas the OLED65E7P is the 65-inch class model in the E7 series.

The presence of ULTRA Luminance technology on both of them hints at their identical brightness output. On a full-field white (100% window size), the OLED65B7P and OLED65E7P can reach approximately 150 nits. Considering that SDR content is typically mastered to 100 nits, both TVs are capable of displaying the entire dynamic range of SDR content. When you factor in their perfect black level (owing to the self-emissive nature of OLED, they can show no light on a pixel level), the result is a reference grade picture quality with SDR content (DVDs, Blu-ray discs, cable and broadcast TV) in terms of contrast.

The luminance output for 25% and 50% window sizes is indicative of how much headroom the OLED65B7P and OLED65E7P have when used in bright environments (or if you'd like to have a brighter picture overall, regardless of the surrounding light conditions). They are capable of approximately 430 nits (25% window size), and about 320 nits (50% window size). Given that most SDR content has low-to-mid APL (average picture level), the OLED65B7P and OLED65E7P provide sufficient headroom in case an overall brighter picture is required.

HDR (High Dynamic Range) content is fundamentally different from SDR content. HDR doesn't make the entire picture brighter but only certain portions of it for the purpose of increasing the dynamic range. This is why it's important to know the peak luminance of the OLED65B7P and OLED65E7P in small specular highlights. They can reach around 720 nits (10% window size) and circa 900 nits (5% window size) when in HDR Vivid mode. Different HDR modes, however, produce slightly different peak brightness, depending on how they track the D65 white point.

HDR10 is one of the HDR formats that both TVs support. HDR10 is typically mastered to either 1,000 nits or 4,000 nits. The OLED65B7P and OLED65E7P are able to reproduce the former faithfully. When it comes to HDR10 content mastered to 4,000 nits, though, a significant amount of tone-mapping comes into play. If the scene has mid-to-high average picture level, a certain amount of clipping of the highlights can be observed, meaning slightly less amount of detail is resolved in the highlights. That being said, both models employ Active HDR processing for analyzing and optimizing HDR10 on a frame-by-frame basis. This is done to address the issue of HDR10 containing only static metadata for the entire content, which prevents scene by scene optimization. By inserting dynamic metadata as needed, the available color volume and dynamic range of the TV can be utilized more efficiently during different scenes, hence less clipping.

Dolby Vision is another HDR format supported by both the OLED65B7P and OLED65E7P. This format is natively accompanied by dynamic metadata, meaning the Active HDR processing doesn't effect it. Furthermore, the dynamic metadata is generated during post-production. The Dolby's intelligent Display Mapper, which is tuned for the exact display capabilities, uses the dynamic metadata to produce the best possible output based on the display's known characteristics. Not only does it provide scene-by-scene optimization but also maintains the creator's intended look of the Dolby Vision content. The OLED65B7P and OLED65E7P also support HLG (Hybrid Log Gamma), which is a standard for some future HDR TV broadcasts. Additionally, they are ready to support Advanced HDR by Technicolor via a future firmware update.

The motion handling is identical since they both utilize panels with 120Hz native refresh rate. That being said, neither the OLED65B7P, nor the OLED65E7P employ black frame insertion technique, which would have allowed for retinal persistence to be cleared, thus preventing individual frames to be blurred together. Still, the nearly instantaneous pixel response time of OLED, in addition to the user-adjustable motion-compensated frame interpolation, leads to both models being perfectly suitable for watching fast-paced sports, for example.

Both models can display Billion Rich Colors, meaning the panel on the OLED65B7P and OLED65E7P is 10-bit. Smooth color gradation is thus possible, without any color banding. They also cover the DCI-P3 (Digital Cinema Initiative) color space almost entirely, meaning they can show Cinematic Color, i.e. all the colors that are in UHD Blu-ray discs, with little or no tone-mapping. SDR content is typically graded in a color space that is significantly smaller than DCI-P3, so both models have no problems with fully covering the BT.709.

The OLED65E7P has an integrated sound bar between the stand and the screen, which allows the sound to be directed towards you. The total audio power output is 40 Watts over 2.2 channels. The OLED65B7P has the same audio power output but it lacks the sound bar. Both models, however, have a Dolby Atmos decoder. You can listen Dolby Atmos soundtracks through the TV speakers, or use HDMI Audio Return Channel to pass-through the bitstream to a compatible receiver.

The design of the OLED65E7P is called Picture-on-Glass. As the name suggests, the ultra-thin OLED module is directly applied to the glass back. The integrated sound bar is not removable. You can nevertheless wall mount your OLED65E7P using a VESA 300x300 compatible wall mount. In case of placing your TV on a table-top surface, the stand, which is joined at an angle, provides some clearance beneath the sound bar.

The OLED65B7P doesn't use the Picture-on-Glass design of its counterpart. The stand is also different. It comprises a clear plastic pedestal with a base that has a brushed metal finish and it's black in color. The OLED65B7P can be wall mounted using a VESA 300x200 compatible wall mount.

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