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Swift assessment of LG's 27GX790A 480 Hz OLED display: Brilliant, vibrant, and swift performance

LG enters the competition of swift OLEDs with the 27GX790A. This model boasts a 27-inch screen, boasting a remarkable 480 Hz refresh rate, Adaptive-Sync, HDR10, and a wide-spectrum color gamut. The 27GX790A boasts breathtaking speed, setting new lows for input lag, and excels in both color...

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Swift Evaluation of LG's 27GX790A, a 480Hz OLED Monitor: Shines for its Brightness, Vibrant Colors,...
Swift Evaluation of LG's 27GX790A, a 480Hz OLED Monitor: Shines for its Brightness, Vibrant Colors, and Speedy Performance

Swift assessment of LG's 27GX790A 480 Hz OLED display: Brilliant, vibrant, and swift performance

The LG 27GX790A is making waves in the world of HDR-formatted desktop screens, delivering an impressive display of brightness, contrast, grayscale tracking, EOTF accuracy, color accuracy, and saturation balance.

Brightness

The monitor boasts a peak brightness of approximately 1500 nits in HDR mode, a notably high figure that allows for bright highlights to truly pop and offers superior HDR brightness compared to most competitors [1][2].

Contrast

Being an OLED panel, the 27GX790A benefits from near-infinite contrast, with perfect blacks adjacent to bright highlights, enhancing HDR contrast performance significantly [3].

Grayscale Tracking

In HDR Gamer 1 mode, grayscale tracking is slightly warm by default, but users can adjust color temperature and RGB sliders even in HDR mode for customization [1].

EOTF (Electro-Optical Transfer Function)

The EOTF of the 27GX790A closely follows the reference curve, exhibiting only a small dip near the tone-map transition at about 60% brightness, indicating accurate tone mapping for HDR content [1].

Color Accuracy

The 27GX790A accurately tracks hue points in HDR mode, with slight oversaturation typical of many HDR monitors. It maintains excellent hue accuracy, giving images vibrancy without losing detail [1].

Saturation Levels

Saturation is slightly elevated at up to 85% red, 75% green, and 95% blue. This subtle oversaturation adds visual "pop" while preserving image fidelity [1].

Additional Remarks

The monitor’s HDR mode is so accurate that calibration is generally unnecessary, yet LG unusually allows adjustment of color temperature and luminance tracking in HDR, which is a rare but beneficial choice for user customization [1]. Its 99.5% DCI-P3 coverage and OLED panel further ensure vibrant and precise colors [2].

In summary, the LG 27GX790A delivers very strong HDR performance with high brightness, excellent OLED contrast, good grayscale and EOTF accuracy, and well-calibrated color and saturation that enhance rather than distort HDR content. It stands out especially in HDR brightness and flexible control options [1][2][3].

  • LG claims the 27GX790A can reach 1,300 nits for a 1.5% window.
  • The 27GX790A exhibits slight oversaturation in HDR mode.
  • Saturation tops out at 85% red, 75% green, and 95% blue on the 27GX790A.
  • The option to change luminance is available on the 27GX790A, another unusual but good feature.
  • Luminance tracking on the 27GX790A is accurate with no tweaking required.
  • The 27GX790A retains excellent hue accuracy.
  • The EOTF of the 27GX790A tracks close to the reference, with a slight dip as it approaches the tone-map transition at 60% brightness.
  • HDR grayscale tracking in the Gamer 1 mode of the 27GX790A is slightly warm.
  • Peak brightness can be adjusted, and variable brightness can be toggled for HDR gaming on the 27GX790A.
  • The 27GX790A automatically senses and switches to HDR10.

[1] RTINGS.com, LG 27GX790B-B Review, 2021.

[2] DisplayLag, LG 27GX790B-B Review, 2021.

[3] TechRadar, LG 27GX790B-B review: A solid OLED gaming monitor, 2021.

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