The motion blur display , also called HDTV blur and LCD motion blur , refers to some visual artifacts (anomalies or unwanted effects that affect the still image or move) that is often found on modern high-definition consumer television sets and flat panel displays for computers.
Video Display motion blur
Cause
Many blur factors have been around for a long time in movies and videos (eg slow shutter speed cameras). The advent of digital video, and HDTV display technology, introduces many additional factors that now contribute to the blurry movement. The following factors are generally the main or secondary causes of the motion that are felt blurred in the video. In many cases, many factors can occur at the same time across the chain, from the original media or broadcast, to the receiving end.
- Pixel response time on LCD screen (blurry motion caused by slow pixel response time)
- Lower camera shutter speeds are common in Hollywood production movies (blurred in movie content), and common in miniature camera sensors that require more light.
- Blur from eye-to-eye object tracking on LCD, plasma, or sample-and-hold microdisplay.
- Resolution resolution (opaque for resizing images to fit the HDTV original resolution); not a blurry movement.
- Deinterlacing by display, and telecine processing by studio. This process can soften the image, and/or introduce motion-speed deviations.
- Compression artifacts, present in digital video streams, can contribute additional blur during fast motion.
Motion blur has become a more severe problem for LCD screens, because of their sample-and-hold properties. Even in situations where the response time of pixels is very short, blur is still a problem because the pixels remain lit, unlike CRT phosphors that blink only briefly. Reduced LCD pixel time on, can be done by turning off the backlight as part of a refresh. This reduces the blurry movement due to eye tracking by reducing the backlight time on. In addition, the backlight on which it can also be combined together with motion interpolation to reduce motion-based motion blur movement.
Maps Display motion blur
Repair
Backlight on
Different manufacturers use many names for the backlight technology that lights up to reduce opaque motion on the sample and resistant LCD screens. Generic names include black frame insertion and scanning backlight .
- Philips makes Aptura, also known as ClearLCD, to turn the backlight on to reduce sample time and thus blur the retina for sample-and-hold.
- Samsung uses backlighting as part of their "Clear Motion Rate" technology. It's also called "Motion Plus LED" on some previous Samsung screens.
- BenQ develops SPD (Pulse Drive Simulation), also better known as "black frame insertion", and claims that their images are stable and clear like CRTs. This is conceptually similar to a backlight that is on.
- Sharp Corporation uses "backlight scanning" that quickly flashes backlights sequentially from top to bottom of the screen, in each frame.
- nVidia has licensed a strobe backlight technology called LightBoost to display the manufacturer. This is typically used to reduce crosstalk during 3D Vision, which uses shutter glasses, but also eliminates frosted motion due to its ability to keep pixel transitions in the dark between LCD refreshments. A 'hack' method or utility tool is required to utilize the LightBoost backlight for the benefits of blur reduction.
- BenQ then developed their own "BenQ Blur Reduction" technology, integrated into their multiple game monitors. It offers strobe backlights that can be easily turned on and off by the user. No control over strobe or long strobe time for users, although third party utilities have been manufactured for this purpose. The newer Firmware for BenQ Blur Reduction monitors allow direct user control over strobe pulses (time) and strobe length (persistence) directly from the Service Menu. More adjustments are available by using a higher Total Vertical (from 1498-1502, depending on what is not causing the error), which effectively tricks the Mstar scaler into working with larger clearing intervals, as if the screen size is longer vertical. This effectively pushes the strobe crosstalk well below the screen, improving the strobe image quality, but with some disadvantages (such as faint scanlines effects, also seen in the Strobe LightBoost mode).
- Eizo also introduced the 'Turbo 240' option they used so far in their Eizo Foris FG2421 game view. This allows the user to control the on/off strobe backlight easily to reduce motion blur that is felt
- LG introduced a similar 'Motion 240' option on their 24GM77 game monitor
- ULMB is a technique provided with NVIDIA's G-sync technology, and is connected to G-sync monitor module. This is an alternative option to use G-sync (and can not be used at the same time), offering users instead of "Ultra Low Motion Blur" mode. It has been provided on various monitors that already display G-sync (eg Asus ROG Swift PG278Q, Acer Predator XB270HU). For newer games with higher graphics demands, G-Sync is preferred over ULMB.
Motion interpolation
Some displays use motion interpolation to run at higher refresh rates, such as 100 Hz or 120 Hz to reduce motion blur. Motion interpolation produces an in-between artificial frame inserted between the original frame. The advantage is the reduction of opaque motion on the sample display and hold like LCD.
There may be side effects, including the soap opera effect if interpolation is enabled while watching the movie (material 24fps). Motion interpolation also adds lag input, which makes it undesirable for interactive activities such as computers and video games.
Recently, 240 Hz interpolation has been available, along with displays that claim equality to 480 Hz or 960 Hz. Some manufacturers use different terminology such as Samsung "Clear Motion Rate 960" rather than "Hz". This avoids the incorrect use of "Hz" terminology, as some blur-reduction technologies are used, including motion interpolation and flashing backlights.
Manufacturer terminology:
- JVC uses "Clear Motion Drive".
- LG uses "TruMotion".
- Samsung uses "Auto Motion Plus" (AMP) and "Clear Motion Rate" (CMR)
- Sony uses "Motionflow".
- Toshiba uses "Clear Frame".
- Sharp uses "AquoMotion".
Laser TV
Laser TVs have the potential to eliminate double imaging and motion artifacts by utilizing scanning architectures similar to how CRTs work. Laser TVs are not generally available from many manufacturers. Claims have been made on television broadcasts such as KRON 4 News' Laser TV coverage from October 2006, but no television sets consumer television sets have made significant improvements in reducing any form of motion artifacts since then. One of the latest developments in laser screen technology is the phosphorus-fed laser, as shown by Prysm's latest display. This display currently scans at 240 Hz, but is currently limited to 60 Hz input. It has the effect of presenting four different images when the eye tracks a fast moving object viewed from a 60 Hz input source.
There is also Microvision's Laser MEMS-Based Pico Projector Pro, which has no lag view, no input lag and no sharpness or motion blur
LED and OLED
Both OLED and Sony Crystal LEDs display the use of independent light sources for each pixel, without the traditional CCFL or LED backlights used in LCDs. Sony's Crystal LEDs use individual light-emitting diodes for each pixel, instead of using LEDs as backlights. Some displays demonstrated at CES 2012 have become the first modern high definition television sets to overcome motion artifacts by selectively choosing sections of the screen. Both OLED technology and "Crystal LED" also have a much shorter response time than LCD technology, and can significantly reduce motion blurring. However, all Consumer OLED Displays are an example-and-hold, which leads to the same number of motion blur as a traditional LCD Display.
See also
- An interlaced video
- Telecine Judge
References
External links
- Reducer Back Blur Movement
- Pursuit camera photography from LCD motion blur
- Articles in HDTV Magazines that do a good job of masking blurry movements on LCD panels
- Links that explain the blurring motions of the sampling technique and containment and subtraction using the LED backlight
- TestUFO.com: Motion test animations that also show blur view
- Techmind.org: LCD technology and stationary test pattern
- 1080p and framerates explain
- Method for 3: 2 Pull Down
- BenQ monitors that use flame to reduce sample-and-hold artifacts due to eye movement tracking
- A Windows application that shows a blurry retina because the example and display continues
Source of the article : Wikipedia
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