Perhaps, every year among number of persons interested to get a PDA, the cohort of the people inclining to purchase is more and more allocated. And "pure" PDA become less popular. without module GSM/GPRS which do not give to the owners the chance to make calls. A shortcoming extremely doubtful, considering prompt development of Wi-fi and VoIP that in the near future for many will develop into plus.
Generally, at a PDA after all there are advantages, InfoAdvisor.net already spoke about them in earlier. For those who stopped the choice on purchase of a PDA, and this material is planned. Let's try to focus attention on the most interesting models of the developed market of pocket computers, and to allocate highlights necessary at a choice.
What it is possible to tell about the PDA today's market? He dies. No, he is more correct to tell stood waiting. In expectation and a choice of the direction in what it is worth moving.
Productivity about the power of processors at the level of 400-600 MHz and random access memory of 64 Mb grabs eyes for performance of the tasks assigned to a PDA. And, in view of that more advanced users "accelerate" processors in the as they call, "machines" on 50-100 MHz, producers do not have the reasons, to work on productivity. Though personally from myself I would add that the increase in a RAM would do good. There are, of course, devices with the RAM of 128 Mb, but their other characteristics do not allow to rank them as a number of a PDA. It either communicators (Qtek 2020i, O2 XDA IIi), or devices very close to sublaptops (HTC X7500, i-Mate Ultimate 7150). The same models suitable under this criterion (Asus MyPal A730w, Toshiba Pocket PC e800, HP iPAQ H5550) are unfortunately laid already off also them not to find in free sale.
Thus, production of a PDA gradually disperses in two main directions. Introduction of the GSM module that turns it into a communicator, to the detriment of the general operating time, and sometimes and to the physical size of the screen. Or on the contrary, there is an increase in a diagonal of the screen, but thus that such device keeps the portability, the initial idea of "karmannost" disappears as that. And on appearance, and at the price, such devices are closer to sublaptops and UMPC.
That is, it is necessary to choose a PDA from the models which are let out quantity in 2005/2006. For us the greatest interest "machines" of such famous producers as HP represent, Asus, Fujitsu-Siemens, Dell, Acer, plus which entered not so long ago this area, Qtek.
PDA screen size
What the general at all PDA what is so attractive to their users, future and real? First of all, we choose a PDA because of the acceptable screen size with a diagonal from 3 inches. We will undertake its consideration first of all. As one of the making PDA, characteristics of the display are directly reflected in convenience to work with "machine".
At the majority of the PDA falling under our choice, the diagonal of the screen makes 3,5 inches. An exception of this rule – some models of pocket HP iPAQ computers of the HW65xx, HW67xx and HW69xx series which because of presence of the qwerty-keyboard on the display still had a little place, its diagonal only 3 inches. In such a way developers decided to combine convenience of use of a PDA with the introduced GSM module. Feature of HP iPAQ of the HW series also was that displays got non-standard permission 240х240. The similar decision is available also Fujitsu-Siemens (Pocket Loox T810 and T830), but here the diagonal is even less – only 2,4 inches.
It is possible to look narrowly at these PDA if such opportunities are important first of all as:
- disposal of control of communication between a PDA and phone for Internet connection;
- work with e-mail, mostly its check and short letters in reply;
- viewing and insignificant editing office documents;
- commission of calls and sending SMS.
All this is permissible at the expense of a combination of functionality of the mobile phone and a PDA in one case with the qwerty-keyboard. I.e. these quite are suitable for performance of functions which do not demand the special productivity and the big screen. Though, unfortunately, convenience of the keyboard on these "machines" surpasses comfort of work when typing by means of a stylus, but nevertheless loses to the full. And all because dimensions of a PDA of HP iPAQ of the HW series did not allow to make the button rather large, owners of thumbs will press the next buttons. Such peculiar realization has also the shortcomings:
- not so convenient reading as on colleagues with a bigger diagonal – the thicket should glance over;
- not all appendices and games support permission 240х240.
And one more shortcoming peculiar to any communicator. Imagine a situation when you work at a PDA, and at the same time on it receive the entering call. The call not only interrupts work at an inopportune moment, but takes away from you opportunity at the same time to open necessary files if necessary. This moment, of course, for whom has no such basic value and as the option, is eliminated with use of a font, but nevertheless it is.
But nevertheless the main moment there is a PDA screen diagonal. From all users of a PDA with a diagonal of 3,5 inches of very few people will agree to change the device for another with a smaller size of the display. It can be compared to a situation on monitors for desktop computers: it is possible to take also the 15-inch monitor, but nevertheless more pleasant to work at the 17th. Therefore nevertheless it is better to have the pocket computer with 3,5 inch screen, especially if you at least periodically assume to use the PDA for games and viewing of movies.
Among all models of the pocket computers presented in shops meet also such which diagonal is slightly more (3,7 inches at a n300 series Acer PDA). But it is purely subjective, for example, if to compare Acer n311 and Fujitsu-Siemens C550 screens, the difference in sizes is imperceptible. Therefore the tenth shares of inch can hardly be considered at a choice.
PDA display resolution
More important factor for a PDA is the display resolution and also whose matrix of production was used.
Actually on a display resolution there are only two options. The first option – 320x240 (QVGA) pixels, a PDA with such permission the majority. And pocket computers with the resolution of 640х480 (VGA), it is not much such models. And the more so they are of special interest for a certain circle of users.
For more educated in this question it is clear, what advantages the VGA screen on a PDA gives. At resolution of 640х480 pixels on the screen of the pocket computer 4 times more points are placed, than at permission 320х240. And it means that picture clearness on such display is much higher. It is not so important, when viewing text documents. But for those who would like to choose for himself a PDA as the full-fledged entertaining center (for games, viewing of a photo and video), the difference will be notable. For example, if to compare a photo of a fluffy kitten on a PDA to QVGA and VGA displays, at once is evident distinctions in the clearness of limits of the picture. Roughly speaking, kitten hair at permission 320х240 will look indistinct against that is capable to display the VGA screen. For the simple user, bigger permission will mean granularity reduction, i.e. those small squares of which there is an image, will become less noticeable for an eye.
Perhaps, someone will consider that I am too captious. And it is natural. In many respects, the choice of the PDA concrete model depends on that you want to receive from it. After all for one higher resolution it is so important that the person is ready to pay in addition the necessary sum. For the same to whom the PDA will serve as "eReader" of electronic books and the QVGA screen will be quite enough. Though to be fair it is necessary to tell that after all and for reading and web surfing it will be more pleasant to have nevertheless on a PDA the display with the resolution of 640х480. At first sight and when using, advantage is obvious not to all. In reality higher resolution at the same physical sizes allows to place on it bigger quantity of symbols. And furthermore on a PDA where fight is conducted for each share of millimeter. A problem only that pocket computers with VGA screens belong to Hi-End to a class. Therefore, except the VGA display, such PDA have a wide set of other opportunities (for the corresponding price), simply unnecessary for those who looks for the "simple" device for and viewing of Internet pages. Among other things, for work with the VGA screen more resource-and an energoyemka (higher load both of the processor, and of the accumulator).
PDA screen matrix
One more important point at a PDA screen choice, what matrix is used in "machines" by producers. The factor not all the acquaintance, but can affect a PDA choice, especially if it is necessary to be defined between two-three machines, similar on other characteristics.
Mainly, in a PDA matrixes from two Sony and Sharp firms known for all are used. Of course, the first name speaks for itself. And, the truth – in practice PDA with the established matrix of production of the Sony company proved to be better. Without excessive extolling it is possible to tell that their main differences in the best color rendition, in higher rates of brightness and in excellent viewing angles. The matrix of production Sharp seems to rather more dim, but nevertheless to work at such PDA also rather comfortably. It is impossible to tell that the PDA with a matrix from Sharp is much worse, the indicators which are quite accepted. Can confuse only visibility of the screen which already at an angle 45 degrees become badly readable. Nevertheless to show at the same time several familiar photos or video on such PDA it will be inconvenient. Application of a matrix from Sharp is quite justified from that point of view that its price is lower than a similar product from Sony. At the expense of it it is possible to reduce the total price of a PDA at preservation sufficient by and large for use of characteristics.
How to learn, on what PDA the matrix of that other producer is used. HP and Fujitsu-Siemens firms took for the rule to establish in the PDA of a matrix of Sony. For pocket computers from Asus, Acer and Dell was matrixes of Sharp firm are chosen. But once again I will repeat, the difference in work of matrixes is purely subjective, it is better to look at the screen of the PDA interesting you personally. And which to look and compare now you know.
InfoAdvisor.net considered necessary to pay so much attention to the PDA screen as the display makes the first impression. And especially it is important to pick up the pocket computer with such screen which will satisfy all your requirements during the work with it. For example, for use of a PDA in the car as the GPS navigator the essential role is played by visibility of the screen. Therefore for certain it is necessary to choose among a PDA from HP or Fujitsu-Siemens. Though models from Asus and other producers also have the right for existence.
By the way, after purchase we recommend to get at once a protective film for the PDA screen, especially if you plan to use it very actively. Further we will tell and other characteristics, influencing their productivity and functionality, and, naturally, on an our choice.