Panasonic TX-50AX802B 4K TV Review (它和X950B是本年度的对手)

makevin123

首先我要澄清我不是松下粉，也不是三星和索尼粉，不过看了松下2014在CES的新品介绍后，总觉得AX800系列会是松下转型的大作。最近AX800在国外陆续上市了，现在终于找到一篇测评：http://www.hdtvtest.co.uk/news/tx-50ax802b-201405193778.htm

我就不一一翻译了，有兴趣的童鞋就自己上去看看吧。 看完后，我觉得今年的倚天剑和屠龙刀就是松下的AX系列和索尼的X9500B了。
希望在中国也能出个50寸的型号吧，让客厅小的也能用上好画质的机器。


Benchmark Test Results

Dead pixels	None (not easy to see when pixels are this tiny)
Screen uniformity	Some banding & dirty screen effect
Overscanning on HDMI	0% with [16:9 Overscan] set to “Off“
Blacker than black	Passed
Calibrated black level (black screen)	0.056 cd/m2
Calibrated black level (ANSI checkerboard)	0.056 cd/m2
Black level retention	Stable if [Adaptive Backlight Control] off
Primary chromaticity	Excellent
Scaling	Excellent
Video mode deinterlacing	Effective jaggies reduction
Film mode deinterlacing	Passed 3:2 over 480i with [Film Cadence Mode] on
Viewing angle	Decent for VA LCD
Motion resolution	1080 lines (or higher) with [Intelligent Frame Creation] “Mid” or “Max“
Digital noise reduction	Optional; effective when engaged
Sharpness	Defeatable edge enhancement
Luma/Chroma bandwidth (2D Blu-ray)	Full Luma; slight vertical chroma limitation even with [1080p Pure Direct] on
1080p/24 capability	No judder in 2D or 3D
Input lag (high-speed camera)	30ms compared to lag-free CRT in [Game] mode
Leo Bodnar input lag tester	37ms in [Game] mode
Full 4:4:4 reproduction (PC)	Yes, with [Pure Direct] modes enabled

Power Consumption

Default [Normal] mode	112 watts*
Calibrated [Professional1] mode	113 watts
Standby	<1 watt

*Note: In the out-of-the-box [Normal] mode, [Ambient Sensor] was engaged under the [Eco Navigation] submenu.

Picture QualityBlack Level & Contrast Performance

Once we pegged peak white luminance to 120 cd/m2 as per our normal review protocol, the native black level on the TX50AX802B’s VA-type LCD panel measured 0.056 cd/m2 on both a full-field video black signal and a 4×4 ANSI chequerboard pattern. [Adaptive Backlight Control] activates the pseudo-local dimming technology on the TX-50AX802B, and comes in three flavours (“Min“, “Mid” and “Max“) besides “Off“. The “Min” setting lowered black level on a full black screen to 0.017 cd/m2 (ANSI black stayed the same at 0.056 cd/m2), but dimmed dark areas and midtones too much.

Backlight/ Screen Uniformity

Our TX-50AX802 review unit featured very good backlight consistency: once calibrated, there’s only some very, very mild backlight bleeding from the bottom right corner that’s invisible when watching any content other than a full black screen in a dimly-lit environment.

2D

Sublime was the first word that popped to mind once we sampled our collection of reference Blu-rays on the 50in Panasonic AX802. When we reviewed Sony’s new 2014 X9 last week, we declared that it’s the best 4K Ultra HD television we’ve tested to date. Well, the TX50AX802B was right up there with the Sony in terms of picture quality, bettering the KD-55X9005B in some aspects though edged out in others.     The TX-50AX802B’s major strength was its outstanding ability to hang onto its colour saturation in very dark scenes, thanks to Panasonic’s “Super Chroma Drive” technology which uses a WCG (wide colour gamut) LCD panel and 3D LUT (look-up table) to compensate for undersaturated colours in locally-dimmed zones. This had the wonderful effect of making the AX802B look – dare we say it – plasma-esque, with colours appearing richly-saturated regardless of whether the on-screen image was dark or bright.

While Sony and Samsung have implemented black frame insertion (BFI) on their 2014 TVs, Panasonic is still relying on motion-compensated frame interpolation (MCFI) to reduce motion blur on its Viera LCDs. In Panasonic’s defence, we saw no significant interpolation artefacts in real-world viewing with [Intelligent Frame Creation] engaged, and so would be happy using it for video-based content (for example live sports broadcasts) to improve motion clarity.

3D

If anything, the aforementioned “Super Chroma Drive” technology developed by Panasonic benefited tri-dimensional content more than 2D, helping the Viera AX802 preserve colour fidelity despite the darkening effects of the active-shutter glasses. As a result, the TV produced some of the most vibrant and well-saturated colours we’ve ever seen on an active 3D system.

Console/ PC Gaming

The Panasonic AX802/ AX800 is a gamer’s dream, boasting not only the lowest input lag among the 2014 batch of 4K TVs (our Leo Bodnar tester registered a reading of 37ms with [Game Mode] enabled), but also full 4:4:4 chroma reproduction up to 3840×2160 resolution at 60Hz either through the DisplayPort or HDMI 4 input.

Conclusion

The Panasonic TX-50AX802B is a beautifully-engineered piece of display that’s capable of producing absolutely gorgeous images. If last year’s Viera WT600 puts Panasonic on the map as a serious LCD TV maker for video enthusiasts, then the AX802/ AX800 proves that the company can hang with the big boys Samsung and Sony and then some.

Of course, plasma TVs – especially the final generation from Panasonic themselves – still win in terms of black level, viewing angles, screen uniformity and outright picture quality despite a lower screen resolution, but the TX50AX802B was as close as we’ve seen any LED LCD approached plasma’s supremely cinematic image quality. Particularly impressive was the AX802B’s ability to saturate colours in low-APL scenes and also in 3D, thanks to Panasonic’s Studio Master Drive technology.