What is a memory-in-pixel (MIP) LCD?

Memory-in-pixel is a reflective LCD technology developed by Sharp in the early 2000s in which each pixel contains its own 1-bit memory cell that latches the pixel's state. Once set, a pixel holds its state with essentially zero drive power until it changes, so the display's energy draw is proportional to how often the image updates rather than to brightness. MIP panels are reflective, meaning ambient light provides the illumination, which gives them high contrast and wide viewing angles in daylight without a backlight.

What is the difference between the GW-BX5600-1 and the GW-BX5600-1A1?

The two references differ in display polarity. The GW-BX5600-1 uses a positive (light background) MIP display, while the GW-BX5600-1A1 uses a negative (dark background) MIP display. According to Gear Patrol's reporting, there is no in-app polarity toggle, so buyers choose their preferred configuration at purchase. All other specifications, including Tough Solar, Multiband 6, Bluetooth, dimensions, and the $180 US price, are identical.

How does Multiband 6 time calibration work?

Multiband 6 is Casio's name for radio-controlled timekeeping that receives standard-time broadcasts from six transmitters: two in Japan, one each in the United States, the United Kingdom, Germany, and China. The watch's antenna picks up the atomic-clock-derived signal, typically overnight, and can recalibrate up to six times per day, keeping the quartz movement accurate without any smartphone connection.

How long does the GW-BX5600 battery last without light?

Casio rates the GW-BX5600 at approximately six months of operation on a full Tough Solar charge with no additional light exposure, extending to about 22 months with power saving enabled. The memory-in-pixel display helps these figures because a static MIP panel draws almost no power between pixel updates, leaving the solar budget for the radio receiver, Bluetooth radio, and backlight.

Watches × Materials

Forty Years of Squinting: Casio's GW-BX5600 and the Display the Square Always Needed

Marcus Thorne

September 23, 2026

Editorial macro photograph of a black square G-Shock-style digital watch with octagonal resin bezel, glowing LCD time digits and brick-pattern solar dial panel under warm amber workshop lighting

$180

The US price of the GW-BX5600, which buys a memory-in-pixel LCD, Tough Solar charging, Multiband 6 radio timekeeping, and Bluetooth sync in the classic 49.1 by 44.1 millimeter square. Announced in Japan nearly a year ago; launched in the US this September.

A G-Shock can fall off a rooftop and land ticking. It can dive 200 meters, convert sunlight into electricity, and shrug off a decade on your wrist without a battery change. What it could not reliably do, through four decades of the square, was tell you the time at a glance.

Fixing that took a display technology that predates the iPhone, a reflective panel architecture Sharp commercialized in the early 2000s and then watched become the display of choice for every wrist-worn device that valued battery life over color saturation. Announced in Japan nearly a year ago and arriving in the US this September at $180, the GW-BX5600 is the first watch in the 5000 and 5600 lines to use a memory-in-pixel LCD, a change that sends contrast jumping and opens up viewing angles so the sunlight that used to wash out the square's display now just makes it brighter.

This is the most significant functional upgrade to the 5600 line since Tough Solar, and it matters more than any limited edition Casio has issued in years, because the square is the brand's utilitarian core and a utilitarian instrument whose display fights its wearer was an unresolved defect. Casio finally chose to fix it instead of painting it another color.

What Memory-in-Pixel Actually Is

MIP stands for memory-in-pixel, and the technology comes from Sharp, which developed the Memory LCD in the early 2000s as a display that sips power instead of gulping it. Every pixel contains its own 1-bit memory cell that latches the pixel's state, and once a pixel is set it holds that state with essentially zero drive power until the state changes, which means the display's energy draw is proportional to how often the image updates rather than how bright it shines.

A wristwatch mostly shows a static image, the time changing once per second while the rest of the pixels sit frozen. For that duty cycle, an MIP panel's power budget collapses toward nothing, which is exactly the property a solar-charged watch wants. Because the panel is reflective rather than transmissive, ambient light does the illuminating and no backlight is needed in daylight, which is why an MIP watch face stays legible in precisely the conditions that defeat conventional TN displays. Each pixel sits over a tiny mirror, and the liquid crystal either blocks the reflection or passes it, producing the kind of contrast that classic twisted-nematic LCDs cannot reach.

Classic G-Shock displays use conventional TN or STN LCDs, where the controller must continuously drive every segment and the contrast depends on the angle at which you view the crystal lattice. Tilt the watch and the optical path through the twisted crystals changes, so the digits fade or invert. Negative displays, the dark-background variants collectors favor, made the problem worse by asking dim digits to fight bright backgrounds. That is the physical story behind forty years of squinting.

Nor is MIP new to wrists. Pebble built its 2013 smartwatch around a 144 by 168 Sharp Memory LCD, and Garmin has used transflective MIP panels in its Fenix line for years, specifically because they stay readable in direct sun on a battery that must last weeks. Casio is late to this particular party, which makes the engineering choice conservative rather than experimental. Boring, in the best sense of the word.

The Power Story

Tough Solar remains the headline power system, and Casio rates the GW-BX5600 at roughly six months on a full charge with no additional light, stretching to about 22 months with power saving enabled. Those numbers are possible partly because the display stops being a load, which reframes the whole power budget: once the screen no longer demands continuous drive current, the solar cell's job shrinks to feeding the radio receiver, the Bluetooth radio, and the occasional LED backlight burst.

Its solar cell carries a brick pattern, a deliberate nod to the solar array of the very first G-Shock, the DW-5000C of 1983. It is the kind of detail that costs nothing to manufacture and means everything to people who know the reference, a quiet signal from Casio that this watch is aimed at the people who memorized the original's solar panel four decades ago. Casio charges the cell from sunlight and artificial light alike, and the whole assembly lives under mineral glass rather than sapphire. That glass choice is the one compromise that genuinely bothers me at this price, even if it is what keeps the $180 figure honest.

Why It Took This Long

Fair question. If MIP panels existed in the early 2000s and Pebble was wearing one in 2013, why did the square wait until 2026?

Cost is the short answer and volume is the long one, because MIP panels cost meaningfully more per unit than the commodity TN modules Casio buys by the tens of millions, and the 5600 line lives at a price where every dollar of component cost gets negotiated like a treaty. A higher-resolution panel also demanded a new module architecture, new driver electronics, and a reworked case layout, which is a real engineering program rather than a refresh. Casio does not retool the square casually. Ever.

Fashion bought the time. For most of the square's life, the standard positive display was readable enough that nobody rioted, and the negative displays that caused the worst complaints were a style choice, not the default. Readability complaints grew in direct proportion to how popular the reverse-LCD look became. Casio fixed it when the pain got loud enough, which is how the company has always operated. Incremental, stubborn, and eventually correct.

Two Ways to Stay Accurate

Timekeeping runs on a dual path. Multiband 6 pulls standard-time radio waves from six transmitters worldwide and can recalibrate the watch up to six times a day, no phone required. Pair it with the CASIO WATCHES app over Bluetooth and you get automatic time adjustment plus alarm and timer settings, world time across 55 cities and 38 zones plus UTC, a Time and Place log, and a phone finder.

Redundancy is the point. Bluetooth is convenient but fragile, dependent on an app, an operating system, and a battery in another device. No app, no OS, no second battery: the radio receiver answers to none of that. Between the two, this is arguably the most temporally over-engineered $180 watch ever sold, and I mean that as praise.

Still a Square

Nothing about the case will surprise a 5600 owner. Dimensions run 49.1 by 44.1 by 13.4 millimeters at 51 grams, nearly identical to the DW-5600E and GW-5600U, and the case, bezel, and band use the bio-based resin Casio has been shifting its manufacturing toward, in colorways that nod to the DW-5600UE and DW-5600UBB. Shock resistance and 200-meter water resistance carry over untouched.

Display customization is new, and it goes further than a font menu: four timekeeping layouts and two font styles, Classic and Standard, the latter with closed numerals for readers who found the old seven-segment letterforms ambiguous at a glance. Gear Patrol notes there is no in-app polarity toggle, so you choose your display at purchase. Buyers decide up front: the GW-BX5600-1 runs a positive display and the GW-BX5600-1A1 runs the negative one. Around the edges sit the expected tools: a 1/100-second stopwatch for the first 60 minutes, a 24-hour countdown timer, five alarms with one snooze, and a full-auto LED backlight.

Limitations, Then a Verdict

Honest limitations first. I have not handled the GW-BX5600, so I cannot report how the MIP panel reads under direct noon sun or at a steep wrist angle, and Casio's battery figures are manufacturer specs rather than independently verified numbers. No module number was available in public sources at publication, and long-term data on MIP panel aging in a solar watch does not exist yet because the combination is new.

Verdict anyway. At $180 with Multiband 6, Bluetooth, Tough Solar, and now a genuinely readable display, this is the best-value square Casio has ever made, and it is not close. Casio could have spent its engineering budget on another anniversary colorway. It spent it on the oldest complaint in the book instead. After forty years of toughness, the square can finally be read.