In its search for another technology to excite us, the consumer electronics industry is reaching deep _ into the third dimension. The big push for 3-D TV won't happen until next year, but already we can get a taste of 3-D in the home _ on laptops.

AsusTek Computer Inc. and Acer Inc. both have new models with screens that can show both games and movies in true 3-D, if you're willing to wear glasses.

Testing these has been fun. Many games work with 3-D screens, and if you fire up "Batman: Arkham Asylum" on the Asus unit the caped crusader will look so solid that it's tempting to try to reach through the screen to grab his neoprene-covered abs.

But the effect doesn't make the game seem more realistic. If anything, Batman looks more like an action figure than he does in 2-D. Seeing in 3-D on these small screens makes me feel like I'm peering into a dollhouse.

Such limitations to the technology make it hard to see 3-D screens as something that will provide long-term enjoyment, or become a must-have feature. Three-dimensional movie projection has come and gone in waves since the 1950s, and more than 50 years before that, people ogled 3-D photographs. Neither has had staying power.

These aren't the first 3-D laptops either. Sharp Inc. started selling one six years ago. The fact that you probably haven't heard of it is a good indicator of how successful it was.

What's new is that 3-D is now cheaper. While the Sharp model cost $3,300, the new Acer Aspire 5738DG has a list price of $780. The Asus G51JD lists for $1,700, but it's a powerful gaming laptop. Either model is only slightly more than an equivalent non-3-D model, so trying 3-D is no longer a big commitment. Both models have 15.6-inch widescreens and are of the heavy "desktop replacement" variety. The Acer weighs 6.3 pounds and the Asus 7.5 pounds.

We can "see" depth because our left and right eyes have a slightly different view of the world. To replicate that, a flat screen needs to project different images to each eye. Each of the laptops I've tried uses a different technology to get there.

To see 3-D on the Sharp laptop, you didn't need glasses, but you had to keep your head in a particular spot. The Acer model has the same drawback, but in addition, you need to wear glasses! If you move your head from the "sweet spot," you start to see, faintly, the images meant for the other eye, ruining the 3-D effect. It doesn't help that any light reflecting off the screen becomes very distracting in 3-D mode, so proper positioning of your head and the screen is difficult.