We put the OnePlus Open through our rigorous SBMARK Display test suite to measure its performance across six criteria. In the results of this test, we will analyze how it performed in a series of tests and in several common use cases.

Overview

Key Display Specifications:

  • 7.82-inch Flexi-fluid AMOLED (~90.4% screen-to-body ratio)
  • Dimensions: 153.4 x 73.3 x 11.7 mm (6.04 x 2.89 x 0.46 inches) closed
  • Resolution: 2268 x 2440 pixels, (density ~426 ppi)
  • Aspect ratio: 1.0758:1
  • Refresh rate: 120Hz

Pros

  • Good color rendering when viewing photos in the gallery and browsing the web
  • Good readability, which improves in outdoor conditions thanks to the anti-reflective film
  • Smooth interactions when playing games and scrolling the web

Against

  • Disappointing HDR video experience in darkroom due to lack of brightness and detail
  • Frame misalignments are occasionally visible when playing video games
    OnePlus Open, OnePlus’ first foldable device, showed impressive performance in our display tests, with excellent results in terms of readability, color and artifacts.

The OnePlus Open’s readability was among the best we’ve seen so far, scoring near the top of the readability attribute. Color was also a high-performing attribute, approaching a high score. Both attributes contributed to a generally pleasant experience when viewing photos or browsing the Web.

While the screen displayed good brightness in indoor conditions, when it came to watching HDR videos, the screen lacked brightness and detail, detracting from an enjoyable experience.

One of the most challenging aspects of a foldable screen for manufacturers is to de-emphasize the presence of the center crease when the phone is unfolded. But the OnePlus Open surprised us in this respect. We evaluated the device open and found that the flexi-fluid AMOLED screen crease was barely visible. Furthermore, when you ran a finger across the display, the crease was also barely noticeable to the touch. Touch interactions on the OnePlus Open, however, were smooth when scrolling the Internet or playing video games.

The device’s handling of artifacts also earned it a top score in this attribute.

Test summary

About SBMARK display tests: For scoring and analysis in our smartphones and other display reviews, SBMARK engineers perform a series of objective and perceptual tests under controlled laboratory and real-life conditions. Please note that we evaluate display attributes using only the device’s built-in display hardware and its still image (gallery) and video apps with default settings. (For in-depth information on how we evaluate smartphones and other displays, see our articles “How SBMARK Tests Display Quality” and “A Closer Look at SBMARK Display Tests.”

The following section brings together key elements of our comprehensive testing and analysis performed in SBMARK laboratories. Detailed performance evaluations in the form of reports are available upon request. Do not hesitate to contact us.

How the display readability score is composed

Readability evaluates the ease and comfort with which users can read fixed content (photos and web) on the display in various real-life conditions. SBMARK uses its display stand to recreate ambient light conditions ranging from total darkness to bright sunlight. In addition to laboratory tests, perceptual analysis is also carried out in real-life environments.

Readability in an indoor environment (1000 lux).

From left to right: OnePlus Open, Xiaomi Mix Fold 3, Google Pixel Fold

(Photo for illustrative purposes only)

Readability in a sunny environment (>90,000 lux).

From left to right: OnePlus Open, Xiaomi Mix Fold 3, Google Pixel Fold

(Photo for illustrative purposes only)

Measurement of luminance uniformity

This graph shows display uniformity with a gray pattern at 20%. The more visible the green color, the more uniform the display will be.

How the display color score is composed

The color attribute evaluates the device’s ability to accurately reproduce colors. The measurements taken concern fidelity, white point color and gamut coverage. We perform color evaluations for different lighting conditions to see how well the device can handle color in its surroundings. Colors are measured using a spectrophotometer in a controlled lighting environment. The perceptual analysis of the color rendering takes place compared to the reference model displayed on a calibrated professional monitor.

White point under D65 illuminant at 1000 lux

Indoor color rendering (1000 lux)

Clockwise from top left: OnePlus Open, Xiaomi Mix Fold 3, Google Pixel Fold

(Photo for illustrative purposes only)

Color rendering in sunlight (>90,000 lux)

Clockwise from top left: OnePlus Open, Xiaomi Mix Fold 3, Google Pixel Fold

(Photo for illustrative purposes only)

Color fidelity measurements

OnePlus Open, color fidelity at 1000 lux in the sRGB color space

OnePlus Open, color fidelity at 1000 lux in the Display-P3 color space

Each arrow represents the color difference between a target color model (arrow base) and its actual measurement (arrow tip). The longer the arrow, the more visible the color difference. If the arrow remains inside the circle the color difference will only be visible to expert eyes.

Color behavior on the corner

This graph shows the color shift when the screen is tilted. Each point represents a measurement at a particular angle. The dots inside the inner circle show no color change in the corner; those between the inner and outer circles have changes that only trained experts will see; but those that fall outside the outer circle are noted.

How the Display Video score is composed

Our video attribute evaluates each device’s Standard Dynamic Range (SDR) and High Dynamic Range (HDR10) video handling in indoor and low-light conditions. We measure the tone mapping, color gamut, brightness and contrast of the display. We perform perceptual analysis Cons our professional reference monitor (Sony BVM-HX310) to ensure rendering meets artistic intent.

Video rendering in a low light environment (0 lux).

From left to right: OnePlus Open, Xiaomi Mix Fold 3, Google Pixel Fold

(Photo for illustrative purposes only)

Gamut coverage for video content

Primary colors are measured in both HDR10 and SDR. The extracted color gamut shows the extent of the color area that the device can reproduce. To meet artistic intent, the measured gamma must match the primary color space of each video.

How the Display Motion Score is composed

The motion attribute evaluates dynamic content handling. Dropped frames, motion blur, and playback artifacts are examined using games and videos.

Dropped video frames

These long exposure photos have the number of frame irregularities in a 30 second video. Good performance shows a regular pattern (a flat gray image or a drop-down pattern).

How the Display Touch score is composed

To evaluate touch, SBMARK uses a touch robot and a high-speed camera to play and record a series of scenarios for evaluating smoothness, accuracy and response time.

This response time test accurately evaluates the time that elapses between a single touch of the robot on the screen and the displayed action. This test is applied to activities that require high responsiveness, such as gaming.

How the display artifact score is composed

Evaluating artifacts means checking for performance, image rendering, and motion defects that can impact the end-user experience. SBMARK precisely measures device reflectance and the presence of flicker, and evaluates the impact of residual aliasing when playing video games, among other features.

Aliasing (foreground)

OnePlus open

(Photo for illustrative purposes only)

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Philip Owell

Professional blogger, here to bring you new and interesting content every time you visit our blog.