•   Overview
•   Advantage of LG OLED77GX9LA
•   Advantage of LG 55SM8200PLA
•   Common Strengths and Weaknesses
•   Selected Features
•   Specifications

Here we are comparing LG OLED77GX9LA to LG 55SM8200PLA to reveal their common strengths and weaknesses as well as the differences between them which will help you in making a correct decision before the purchase. Both models have the same 4K UHD (3840 x 2160) resolution and they both support HDR.

We have evaluated the TVs from available features and specifications. LG OLED77GX9LA gets higher overall score in our ranking system which is based on the display specifications, video, audio and other features, connectivity and format support.

This section shows the features and specifications which are the reason to choose LG OLED77GX9LA over LG 55SM8200PLA.

This section shows the features and specifications which are the reason to choose LG 55SM8200PLA over LG OLED77GX9LA.

OLED display on LG OLED77GX9LA

LG OLED77GX9LA has an organic light-emitting diode (OLED) display. This is a self-emissive display which can completely turn off individual pixels leading to the ideal black levels and better contrast during HDR compared to any LCD displays. This makes them to be the best choice for dark rooms. OLED enables a simpler internal structure than conventional displays. With just a few layers, OLED TVs are very lightweight and thin. OLED displays also have better viewing angles. However, they are not able to achieve such high brightness as modern LCD displays which makes them less suitable in bright rooms.

IPS Panel on LG 55SM8200PLA

LG 55SM8200PLA has an in-plane switching (IPS) panel. Such panels are not commonly used in LCD TVs as they suffer from light leakage which lead to the lower contrast and poor HDR experience. However, this type of panels can provide better viewing angles and color accuracy compared to the VA panels.

HDR10

LG OLED77GX9LA and LG 55SM8200PLA support HDR10 which was announced on August 27, 2015, by the Consumer Technology Association and uses the wide-gamut Rec. 2020 color space. It is not backward compatible with SDR. It sends static metadata via video stream to the TV which calibrates its screen brightness and color according to that. HDR10 is technically limited to a maximum of 10,000 nits of brightness and uses 10-bit color which corresponds to 1024 shades of the primary RGB colors.

Dolby Vision

LG OLED77GX9LA and LG 55SM8200PLA also support Dolby Vision which is an update to HDR10 by adding dynamic metadata that can be used to more accurately adjust brightness levels up to 10,000 nits on a scene-by-scene or frame-by-frame basis and supports up to 12-bit color depth (4096 shades of RGB) and 8K resolution.

And in the end we display all the specifications which are present for both models.

Note: The following table shows only those details which are applicable for both models and excludes the ones that are applicable for only one model. If you want to see a full list of specs for each model please visit their individual pages here - LG OLED77GX9LA and here - LG 55SM8200PLA.