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LG BX vs CX Review (55OLEDBXPUA vs 55OLEDCXPUA, 65OLEDBXPUA vs 65OLEDCXPUA, 77OLEDBXPUA vs OLED77CXPUA)

by on September 30, 2020
 



LG BX vs CX Review

The LG BX or OLED BX is the lowest model of LG’s 2020 OLED TV Lineup. Meanwhile, the LG CX or OLED CX is the series above it. Just like other OLED TVs, they both offers excellent picture quality with infinite contrast ratio and perfect black uniformity. Additionally, they both also have nearly instantaneous pixel response time and excellent side viewing coverage.  This is caused that they both use the OLED panel that has the same technical platform. Nevertheless, although they use the OLED panel that has the same technical platform, but of course, as the higher model that has more expensive price, the LG CX has some features that’s not found on the LG BX.

In the market, the LG CX is available on 4 screen sizes variants. From the smallest, there is 48 inches (OLED48CXPUB), 55 inches (OLED55CXPUA), 65 inches (OLED65CXPUA), and the largest is 77 inches (OLED77CXPUA). On the other hand, the LG BX is available on 3 screen sizes variants only including 55 inches (OLED55BXPUA), 65 inches (OLED65CXPUA), and 77 inches (OLED77BXPUA). Meanwhile, with the same screen size (55OLEDBXPUA vs 55OLEDCXPUA, 65OLEDBXPUA vs 65OLEDCXPUA, 77OLEDBXPUA vs OLED77CXPUA), the LG OLED CX is sold hundreds dollar more expensive than the LG OLED BX. So, what advantages offered by the OLED CX over the OLED BX? And which is a better choice considering their value/price?

Short Review of the LG BX and CX

LG CX (OLED CX) vs BX (OLED BX) Key Specification

Specs and Features LG BX (OLED BX) LG CX (OLED CX)
Resolution 4K (2160 x 3840) 4K (2160 x 3840)
Screen Type Flat Flat
Screen Sizes Available 55 Inches (OLED55BXPUA), 65 Inches (OLED65BXPUA), 77 inches (OLED77BXPUA) 48 Inches (LG OLED48CXPUB, 55 Inches (OLED55CXPUA), 65 Inches (OLED65CXPUA), 77 inches (OLED77CXPUA)
Panel Type OLED OLED
Dimming Pixel Level Dimming Pixel Level Dimming
Picture on Glass design Yes Yes
Picture Engine Alpha 7 Gen 3 Processor Alpha 9 Gen 3 Processor
4K Up-scaling 4K Up-Scaler AI Up scaling
HDR Format Supports Dolby Vision, HDR10, HLG Dolby Vision, HDR10, HLG
HDR Enhancement 4K Cinema HDR, HDR Dynamic Tone Mapping Pro, Dolby Vision IQ 4K Cinema HDR, HDR Dynamic Tone Mapping Pro, Dolby Vision IQ
Contrast Enhancement Ultra Luminance Pro, Face Enhancing Advanced Contrast Enhancer, Ultra Luminance Pro, Face Enhancing
Color Enhancement Intense Color, Billion Rich Colors, Advanced Color Enhancer, True Color Accuracy, 4 Colors Sub Pixel Intense Color, Billion Rich Colors, Advanced Color Enhancer, True Color Accuracy Pro, 4 Colors Sub Pixel
Clarity Enhancement Double Step Noise Reduction, Frequency Based Sharpness Enhancer Quad Step Noise Reduction, Frequency Based Sharpness Enhancer
Motion Enhancement OLED Motion OLED Motion Pro
Refresh Rate Panel Native 120 Hz Native 120 Hz
Variable Refresh Rate Support HDMI Forum VRR, G-Sync (NVidia Certified), FreeSync, HGiG HDMI Forum VRR, G-Sync (NVidia Certified), FreeSync, HGiG
Platform WebOS 5.0 WebOS 5
AI TV (Artificial Intelligence) LG ThinQ AI, Google Assistant, Google Home, Amazon Alexa, Intelligence Voice Recognition, AI Picture , AI Sound, AI Brightness, Apple AirPlay 2, Apple Home Kit LG ThinQ AI, Google Assistant, Google Home, Amazon Alexa, Intelligence Voice Recognition, AI Picture Pro, AI Sound Pro, AI Brightness, Apple AirPlay 2, Apple Home Kit
AI-based features AI Sound, AI Picture AI Sound Pro, AI Picture Pro
LG Magic Remote 2020 model 2020 model
HDMI 4 4
HDMI Supports HDMI 2.1 (HDMI 3,4), HDMI 2.0 Full bandwidth (All), HDCP 2.2 (All), ARC (HDMI 3), eARC (HDMI 3) HDMI 2.1 (All), HDMI 2.0 Full bandwidth (All), HDCP 2.2 (All), ARC (HDMI 2), eARC (HDMI 2)
USB 3 3
Ethernet 1 1
RF (Terrestrial Cable) 1 1
Composite In (AV) 1 1
Component In No No
Wi-Fi Built In 802.11ac 802.11ac
Bluetooth Support Version 5.0 Version 5.0
Channel 2.2 Channel 2.2 Channel
Total Audio Output 40 Watt(WF : 20 Watts) 40 Watt(WF : 20 Watts)
Dolby Atmos Support Yes Yes

Technologies and Features of LG BX and CX

The Similarities

Panel Technology

As we have mentioned above, although they come for different class, but they use the same OLED panel which have the same technical platform. As we have known, each pixels of OLED panel can emit its own light, so the OLED panel doesn’t need a backlight. Additionally, their pixels also can individually switch on/off/dim without influenced by the condition of other pixels surrounding. Meanwhile, to boost its peak brightness, LG’s OLED panel use WRGB sub-pixel structure where there is additional white sub-pixel to boost its peak brightness. And its individual self-lighting pixel makes the OLED panel has pixel level dimming. This is equivalent to the LED TV that has FALD (Full array local dimming) with the number of dimming zones is same to the number of pixels. This means, if it has 4K resolution (3840×2160), it is similar to the LED TV with FALD that has around 8 million of dimming zones.

HDR Support

The LG BX and LG CX support the same HDR formats. They both support HDR10, HLG (Hybrid Log Gamma), and Dolby Vision. Meanwhile, to maximize their Dolby Vision experience, they both have a feature called Dolby Vision IQ. It is not a new HDR format like HDR10+ that becomes an improvement of HDR10 format. But it is a feature that allows you to enjoy Dolby Vision images with more consistent look. Based on the combination of the screen optimization elements of Dolby Vision, the extra HDR picture information and an assessment of room condition provided by a built-in light sensor, this feature will automatically adjust multiple aspects of Dolby Vision Images in real time to provide Dolby Vision Images with more consistent look. So, regardless the light condition of a room where you use them, you will enjoy Dolby Vision images with consistent look.

Motion Technology

Both of the LG CX and BX have same native 120 Hz native refresh rate panel. This allow them can accept any content with frame rate up to 120 Hz, even HFR (High Frame Rate) content. Additionally, this allows them can interpolate low frame rate content up to 120 Hz. In addition they have native 120 Hz refresh rate panel, they both also support VRR (Variable Refresh Rate) technology. Regardless the resolution is 1080p, 1440p or 4K, their refresh rate can change between 40 HZ to 120 Hz. Additionally, their VRR technology is also compatible with some gaming features like HDRMI Forum VRR, GSync, and FreeSync. As we have known, this feature can improve their performance when used for playing games, allowing you to play any game with screen tearing free.

OLED Motion Pro

The image is only an illustration

Meanwhile, to improve their motion appearance, they both have an optional BFI (Black Frame Insertion) mode. As we have known, OLED panel doesn’t have backlight, so to dim their screen, they both don’t use PWM Dimming System. This allows their screen is almost flicker-free. But even so, in certain condition particularly when they are playing fast motion images, a screen flicker is required to make motion look smoother. By enabling their BFI mode, their screen will flicker at 60 Hz or 120 Hz, depending on the setting. On the OLED CX, the 120 Hz BFI mode only works properly in Game mode while on the OLED BX, set OLED Motion to “Low” or “Medium” will make their screen flicker at 120 Hz. Meanwhile, to enable their 60 Hz BFI mode, you must set “TruMotion” to “User” and “OLED Motion” to “High”. But keep in mind, you cannot use GSync when their BFI mode is enabled.

Smart TV Platform

WebOS 5.0

Both of the LG CX and BX run same the same smart TV platform, which is WebOS 5.0. It is the latest version of WebOS. On both, WebOS run smoothly without any serious bug. As we have known, WebOS has a simple and intuitive interface, allowing you to use it easily. Additionally, it also has a lot of preinstalled apps.  Almost all of streaming services like Netflix, Amazon Prime, YouTube, etc, are provided. There are also Web Browser, Games, Live TVs, and more. It also has an app store called “LG Apps Store” that has good selections of downloadable apps, theme, games, etc. Just like previous version, this platform also has built-in voice navigation that works with its own platform called LG ThinQ AI. Not only that, it also already supports Amazon Alexa and Google Home and they are built-in, so to use this app, you don’t need buy additional “listening speaker”. Now, it also already supports AirPlay 2 and Apple HomeKit. But even so, although both of the LG BX and CX run the same smart TV platform, since the OLED CX is powered by a processor that has higher performance, WebOS runs smoother on it than on the LG BX.

Remote Control

As their main controller, they both are also equipped with the same smart remote called “LG Magic Remote”. Their remote is fairly large and has many buttons. In addition to standard button like “Power On”, “Number buttons”, “Volume Buttons”, “Channel Buttons”, “Direction Buttons”, etc, it also has 2 dedicated buttons for Amazon and Netflix, allowing you to launch these apps without entering menu.  That makes it is excellent, it also has “clickable scroll wheel“at the center of the remote, allowing you to use it like a mouse on laptop. This certainly makes its navigation is easier. Just like other smart remote, it is also equipped with built-in microphone, allowing you to navigate with your voice command. Their remote also can act as a universal remote, allowing you to control other device connected on your TV with a single remote, even if they don’t support CEC.

The Differences

Images Processor

One of the major differences between the LG BX and LG CX is their image processors. As we have seen on comparison table above, the OLED BX is powered by Alpha 7 Gen 3 images processor while the OLED CX is powered by Alpha 9 Gen 3 image processor. They both may have ability to make the LG CX and BX has some AI-related features. However, the Alpha 9 Gen 3 processor has more powerful performance and more features not found on the Alpha 7 Gen 3. As we see on comparison table, there are some differences in features that influenced by their image processor like OLED motion and OLED Motion Pro, Double Step Noise Reduction and Quad Step Noise Reduction, AI Picture and AI Picture Pro, AI Sound and AI sound Pro, Tru Color Accuracy Pro and Tru Color Accuracy, etc. Can be ascertained, in processing image, the LG CX with Alpha 9 Gen 3 image processor is better than the LG BX with Alpha 7 Gen 3 image processor.

Connectivity

Both of the LG CX and BX are actually equipped with the same connectivity. They both have 4 HDMI ports that support HDMI 2.0 Full Bandwidth, CEC, and HDCP 2.2. They actually also support HDMI 2.1, ARC, and eARC. But that makes them are different is about the number of HDMI ports which support HDMI 2.1 and ARC. On the OLED CX, although not full bandwidth, all of its HDMI ports already support HDMI 2.1 while on the OLED BX, there are only HDMI 3 and 4 that support HDMI 2.1. Additionally, On LG CX, its HDMI ports that support ARC and eARC is HDMI HDMNI 2 while on LG BX is HDMI 3.

Except what mentioned above, the connectivity of the OLED BX and OLED CX is same. They both have 3 USB ports where all of their USB Ports are USB 2.0 and none of them are USB 3.0. Nevertheless, although they both don’t support USB 3.0, the bandwidth of USB 2.0 is wide enough to directly play any content via USB ports. In addition to HDMI and USB ports, they both are also equipped with Composite IN (Incl. Adapter), RF IN, Digital Audio Out (optical), Analog Audio Out (Mini Jack 3.5 mm), and 1 Ethernet port. They both are also equipped with built-in Wi-Fi and Bluetooth for wireless connection.

Check the Latest Price
LG BX (OLED BX) LG CX (OLED CX)
48 inches OLED48CXPUB on Amazon
55 inches OLED55BXPUA on Amazon OLED55CXPUA on Amazon
65 inches OLED65BXPUA on Amazon OLED65CXPUA on Amazon
77 inches OLED77BXPUA on Amazon OLED77CXPUA on Amazon

LG BX vs CX Performance

Contrast and Black Level

OLED TV Black Level

The image is only an illustration

As we have known, one of the major advantages of OLED TVs is about their infinite native contrast ratio. As we have discussed above, since each pixel of OLED panel can emit its own light, it doesn’t a backlight. So, when it is showing black, there is no light at all emitted from their screen. The result, black produced by OLED TVs including LG BX and CX is nearly perfect, even if the surrounding of black area is bright. Additionally, its individual self lighting pixels also makes black uniformity of both is also nearly perfect. Not only that, their pixel dimming level also makes small highlight in a dark scene also look very focus without any blooming surrounding. The result, dark scene look excellent on their screen, especially when they are playing HDR content, even if they are set in a pitch dark environment.

Winner: Draw

SDR Peak Brightness

The LG OLED CX has brighter SDR peak brightness than the OLED BX. With real content, the OLED CX can hit around 325 nits while peak brightness reached by the LG BX is less than 300 nits. Meanwhile, although they use the same OLED panel, but the behavior of their peak brightness is different. The LG CX hit its highest peak brightness on 2% and 10% window (2% and 10% of screen is bright while the rest is dark) where it can hit around 460 nits for a short time and slightly drop to around 340 nits after stabilized. On the other hand, LG BX reaches their highest peak brightness on 10% window where it hits around 400 nits for a short time and slightly drops to around 380 nits after stabilized. On 2% window, it hits around 340 nits only for a short time and slightly drops to around 320 nits after stabilized. And just like other OLED TVs, to prevent excessive power usage, they both also have a feature called “Auto Brightness Limiter) that dims the screen when the larger areas are bright. On 100% window, peak brightness of LG CX is dimmed by its ABL down to around 150 nits while LG BX is down to around 130 nits.

With brighter SDR peak brightness, can be ascertained, in fighting the glare, LG CX is better than the LG BX. This makes the picture displayed on its screen looks more obviously then on the screen of LG BX when they are set in a bright room.

Winner: LG CX

HDR Peak brightness

Just like SDR peak brightness, the LG OLED CX also has brighter HDR peak brightness than the OLED BX. With real content, the LG BX hit around 450 nits while the LG CX can hit far brighter, which is around 700 nits. The highest peak brightness reached by them is also on 10% window where the OLED BX hits a bit brighter than 500 nits while the OLED CX hits around 800 nits. And just like their SDR peak brightness, when the bright areas are larger, their peak brightness is dimmed by their ABL system. On 100% window, the peak brightness of the LG CX is drop down to around 140 nits while the LG BX is around 120 nits. With this behavior, can be ascertained, the HDR peak brightness of the LG CX is still bright enough to bring out highlight in HDR. Even though it cannot show highlights of HDR images brighter than 1000 nits like content creator intended, but for OLED TV, its HDR peak brightness is including the brightest.  On the other hand, HDR peak brightness of the LG BX is not bright enough to truly bring out highlight in HDR.  It cannot get brighter than 550 nits, the minimum recommendation for OLED TV to show HDR images fully.

Winner: LG CX

Color Gamut and Color Volume

Just like other model of OLED TVs, both of the LG CX and BX has excellent color gamut and their color gamut is almost similar. In DCI P3, their color coverage is near-perfect where they both can cover around 97 % of DCI P3 xy and around 99% of DCI P3 uv. And since most HDR contents is mastered in HDR10 that uses DCI P3 color space, this allows you to watch HDR content with very accurate and vivid colors. Additionally, their color coverage in Rec.2020 is also good. They both can cover around 72% of REc.2020 xy and around 77% of Rec.2020 uv. Although not perfect, but at least, most colors of HDR content that mastered in Rec.2020 like Dolby Vision content can be shown fairly accurately.

While their color gamut is almost similar, the LG BX has better color volume than the LG CX, particularly in Rec.2020. Since they both have infinite native contrast ratio, they both can display dark shades of colors extremely well.  On the contrary, they both struggle to display brighter colors. The use of white sub-pixel may make them can produce pure white, but on the other hand, this will de-saturated bright colors. The result, they both cannot produce extremely bright color fairly well.

Winner: LG BX

Side Viewing Angle

LED vs OLED panel Viewing Angle

The image is only an illustration

The other advantage of OELD TVs including the LG OLED BX and OLED CX than LED TV is about their good side viewing angle coverage. On their screen, their perfect black can be maintained up to around 70 degrees off center and front. So, even though you watch TV from the extremely side angle, black of images will still look perfect on their screen. Additionally, their brightness level is also still consistent up to around 60 degrees. Color may still shift at around 30 degrees and is washed-out at around 50 degrees, but this performance in maintaining color accuracy is still better than LED TV. All of this is very useful particularly when you watch a TV together with a group of your family or friend.

Winner: Draw

Motion Handling

As we have known, the other major advantage of OLED TVs including LG BX and CX than LED TV is about their near-instantaneous pixel response time. As we have known, all models of OLED TVs have near-instantaneous pixel response time. The result, when they are playing fast moving images likes fast sports or fast games, motion look clearly with almost no motion blur. Following fast moving object, there is only a very short ghosting trail that is extremely hard to notice. But on the other hand, the near-instantaneous pixel response time can cause motion appear to stutter, particularly when they are playing low frame rate content like 24p movies. But don’t worry, the image stuttering can be solved by enabling their BFI mode or Motion Interpolation.

OLED vs LED TV Motion Blur

Both of the LG CX and BX also can do a great job when playing 24p movies. Regardless the source, whether it is native 24p movies like Blu-Ray or DVD movies, 24p movies via 60i signal like movies from satellite TV, 24p movies via 60p signal like movies via streaming devices, or 24p movies from streaming service like Netflix, Amazon Videos, YouTube, all of them will be shown clearly and smoothly with judder-free. To remove the judder, you just need to enable “Real Cinema” with “OLED Motion” is disabled. Keep in mind, when OLED Motion is enabled there will always be 24p judder, even if you enable “Real Cinema”.

Winner: Draw

Input Lags

Both of the LG OLED BX and OLED CX have excellent input lags in Game Mode. With 60 fps content, regardless the resolution, the input lags of the LG BX is around 15 ms while the LG CX is around 14 ms. While with 60 fps content, the OLED CX is a bit better, with 120 fps content, the LG BX is a bit better, particularly at 1080p and 1440p resolution. At 1080p and 1440p resolution, the input lags of the OLED BX is around 6 ms while the OLED CX is around 7 ms. But even so, at 4K resolution, their input lag is almost similar, which is around 11 ms. With VRR enabled, their input lags is also almost the same, which is around 6 ms for 1080p and 1440p resolution and around 11 ms for 4K resolution. Ignoring their difference, their input lags are excellent and low enough to make them very responsive for any games, even for fast paced games which require fast reflexes. Furthermore, they both also already support some gaming features like FreeSync, GSync, and HDMI Forum VRR that can improve their game experience. This certainly makes them are great TVs for playing games.

Winner: Draw

Check the Latest Price
LG BX (OLED BX) LG CX (OLED CX)
48 inches OLED48CXPUB on Amazon
55 inches OLED55BXPUA on Amazon OLED55CXPUA on Amazon
65 inches OLED65BXPUA on Amazon OLED65CXPUA on Amazon
77 inches OLED77BXPUA on Amazon OLED77CXPUA on Amazon

Conclusion

For Watching Movies

Both of the LG OLED CX and OLED BX are great TVs for watching movies in a dark room. They both have infinite native contrast ratio and perfect black uniformity. So, even though they are set in a dark room, black of images still looks truly black. Additionally, their pixel dimming level also makes small highlight can be shown very focus without blooming, very suitable for a movies with a subtitle. The result, dark scene of movies looks excellent on their screen. Not only that, they both can also do a great job when handling motion and 24p movies, allowing you to watch fast movies with smooth and clear images with judder-free. Unfortunately, their near-instantaneous pixel response time can cause movies appear to stutter in certain scene. But as we have mentioned, the image stuttering can be remove by enabling their BFI mode or motion interpolation.

Winner: Draw

For Watching Sports

Both of the LG CX and BX are also excellent TV for watching sports in a bright room. In addition they both have excellent picture quality, they both also have excellent motion handling, makes fast sports looks very smooth and clear on their screen. Additionally, since most sports has 60 Hz of frame rate, their BFI mode can help to make motion smoother, particularly when they are playing 60 fps content. Not only that, when you are watching a big game with a group of your family and friend, their good side viewing angle ensure all of you to get the best viewing. Meanwhile, since SDR peak brightness of the LG CX is brighter, it is better than LG BX, especially when they are set in a bright room. But even so, although not as bright as OLED CX, SDR peak brightness of the OLED BX is also bright enough to make sports looks obviously in most bright rooms.

Winner: LG CX

Video Games

When used for playing video games, performance of the LG BX and CX is also equally great. IN addition they both have excellent picture quality and great motion handling, they both also have excellent input lags in Game Mode. So, no matter you are playing casual or fast paced games, 1080p 1440p, or 4K games, with HDR or not, you will play them responsively without laggy. Additionally, they both also already support VRR technology that is compatible with some gaming features like FreeSync, GSync, and HDMI Forum VRR, allowing you to play any game with screen tearing-free. Their HDMI ports also already support ALLM (Auto Low Latency Mode), make them can automatically switch to game mode when a compatible game console is detected. But unfortunately, all models of OLED TVs including LG BX and CX has a risk to permanent burn in, particularly when they are showing a static image for a long time. So, playing the same game over long time should be avoided to prevent their screen from permanent burn-in.

Winner: Draw

HDR Performance

The LG CX has better HDR performance than the LG BX. They both may have infinite contrast ratio, perfect black uniformity, and pixel dimming level that allow them can show shadow details of HDR Images excellently. They both also have excellent wide color gamut and color volume that allows them can show most colors of HDR Images accurately. Until here, their performance may be similar. But even so, the LG CX has better color gradient, makes color gradient of HDR images displayed on its screen looks far smoother than LG BX. Additionally, the LG CX also has much brighter HDR peak brightness than the LG BX. Although not as bright as premium LED TV, HDR peak brightness of the OLED CX is still bright enough to bring out highlight in HDR. On the other hand, with less than 500 nits, HDR peak brightness of the OLED BX is not bright enough to truly bring out highlight in HDR. Overall, HDR performance of the LG CX is better than LG BX. But even so, for OLED TV, HDR performance of the LG BX can be also said well.

Winner: LG CX

Summary

As we have discussed above, overall, the LG OLED CX is better than OLED BX. But even so, the superiority of the LG CX over the LGBX is more influenced by their image processor performance than their panel performance.  As we have known, all of LG OLED TVs including LG OLED BX and OLED CX use the panel that has the same technical platform. So, black level, black uniformity, pixel response time, side viewing angle coverage, reflection handling, etc of them are almost similar.  Meanwhile, since the LG CX has higher level of image processor, on the aspects that influenced by their images processor, the LG CX is better than the LG BX. It has better color gradient, smoother smart TV performance, etc. So, which is a better choice between them? If performance is your main consideration in buying TV, the OLED CX certainly is better than the OLED BX. But keep in mind, with the same screen size, the LG BX is sold hundreds dollar cheaper than the LG CX. Now, decision certainly is come back to your own preference and budget.

Check the Latest Price
LG BX (OLED BX) LG CX (OLED CX)
48 inches OLED48CXPUB on Amazon
55 inches OLED55BXPUA on Amazon OLED55CXPUA on Amazon
65 inches OLED65BXPUA on Amazon OLED65CXPUA on Amazon
77 inches OLED77BXPUA on Amazon OLED77CXPUA on Amazon

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