Lenovo Ideapad 340 17iwl Not Working Touchpad
17.3″ 1600 x 900 TNFilm, Intel Core i5 8265U 1600 MHz, 8 GB, SSD 256 GB, graph. adapter: NVIDIA GeForce MX110 2 GB, no OS, cover color black The photo is illustrative. DVD drive. option may not be available depending on the configuration.
Market entry date
The year the model first hit the market, regardless of region. It must be borne in mind that the appearance of a product does not always occur simultaneously in all regions.
The photo is illustrative. DVD drive. option may not be available depending on the configuration.
All laptops can be divided into several large categories.
Classic. standard laptops in their form factor and purpose for any task.
Game. models with a specific “game” design, equipped with powerful hardware and discrete graphics.
Ultrabooks. laptops in a light and thin design.
Workstations. powerful and expensive models for professional purposes.
Netbooks. devices with screen sizes up to 11.6 ”.
Laptops of the “2-in-1” type are transformable devices that combine several operating modes, for example, a classic laptop and tablet. Based on the method of transformation, such models are divided into “rotary” and “with a removable keyboard”.
Based on marketing positioning and technical features, manufacturers divide products into those intended for home and work (business).
A hardware platform is a combination of physical hardware and software components designed to interact with each other and that determine most of the system’s parameters, and above all, the price / performance and power consumption / performance ratios. As a rule, a certain generation processor (based on the same core, but with different frequencies, caches, etc.) and system logic chips (chipset) enter the hardware platform. When choosing a laptop, you should definitely focus on a more “fresh” platform.
The central processor plays a critical role in the computing system. This is its core, which performs calculations, processes incoming information and prepares it for output, and manages connected devices. The processor executes the program (code), loading it from the main memory and placing the results of execution in the memory or directly in the device registers.
The performance of the computing system directly depends on the processor; it determines the list of operating systems and application programs that are supported by the computer.
The model number of the processor usually indicates its place in the line of the manufacturer. The number can be formed according to different principles and schemes, but usually it consists of letters and numbers that indicate the family, clock speed, power consumption, the presence of certain functions (virtualization, multithreading, etc.).
Modern processors may contain several separate computing cores, each of which is actually a full-fledged processor. Programs that support multithreading (the ability to execute in several parallel threads) are able to load several cores at the same time and thereby increase the speed of execution. Thus, the specific advantage of using multiple cores depends on the program being run and can only theoretically approach 100%.
The processor clock speed from the point of view of the user is the speed of the processor performing elementary operations. The higher the clock frequency, the more operations per unit of time a processor can perform, all other things being equal. It should be understood that modern processors are superscalar and multi-core, and they perform not one but several operations in one clock cycle.
Due to the fact that processors of different manufacturers and models may have different internal microarchitecture, it is impossible to compare them directly at the clock frequency. Nevertheless, for processors of the same microarchitecture, it is the clock frequency that is the main criterion for evaluating performance, along with the amount of cache memory.
Some modern processors have a special Turbo mode, which is activated when all the available cores are not fully loaded. The frequency of one or more cores automatically rises to the limit determined by the manufacturer (depending on the processor model).
“Built-in” overclocking allows to improve performance in programs that do not fully use multi-threaded technology.
Processor Power Consumption (TDP)
Thermal package. the maximum energy consumption of the processor, calculated by the manufacturer to ensure efficient heat dissipation. For processors with a higher power consumption, a more efficient cooling system (including the size of the heat sink) is needed. Therefore, notebooks with a thin case use processors with reduced power consumption and performance, and on desktop computers, the power consumption limit can be higher than 100 watts.
The type of material the device body is made of.
Traditionally, plastic of different quality is used for mass production models, since this material is cheap, easy to inexpensively and quickly processed (cast under pressure), has sufficient strength and durability. There are various types of plastic with certain properties. For example, polycarbonate has higher strength and toughness than ABS.
The use of metal can improve the appearance of the device, in some cases. to achieve good rigidity and strength. However, metal is always heavier and more expensive than plastic, so it is often used not for the entire case, but for some parts.
To increase the strength of plastic, reinforcement with carbon fiber or fiberglass is used. Such materials are significantly more expensive, but have higher strength than plain plastic, and less weight and thickness than metal.
A rubber or rubberized case is necessary for protected devices with a higher degree of resistance to external influences. Such devices are commonly used in field or industrial environments.
Devices with a ceramic case have an original appearance. This material is pleasant to the touch and quite durable.
The leather case has both exclusive and status devices, as well as more affordable image models. The presence of embossing gives a spectacular appearance. Compared to plastic, leather is more practical: less easily soiled, does not slip on a flat surface, and scratches are less noticeable on a leather case.
The main color of the case, excluding decorative panels and various elements (borders, buttons, etc.).
The laptop cover is usually made of plastic, but sometimes other materials are used. metal (aluminum, magnesium-aluminum alloy), carbon fiber, wood, leather, glass.
Some laptop models come with covers in various colors, often not matching the color of other body panels.
Laptops and computers, especially gaming and home ones, can be equipped with a decorative LED backlight, often multi-colored.
For devices designed to operate in adverse environmental conditions, protected enclosures are developed that do not allow dust and moisture, are resistant to scratches and shock.
The width of the device in millimeters. Often, the manufacturer indicates the width without protruding parts (buttons and other elements), which should be considered.
Depth of the device case in millimeters. Usually, by depth is meant the linear size of the device mounted on a horizontal plane, in the direction from the observer into the depth of the plane. In fact, it is the same as length.
Thickness in millimeters. Often, the manufacturer indicates the thickness in the thinnest place or without protruding parts (buttons and other elements), which should be considered.
The mass of the device in grams.
Diagonal screen size, measured in inches.
Screen resolution. the total number of pixels in the image, indicated in the form of a matrix.
The first number indicates the number of horizontal dots.
The second is vertical.
The higher the screen resolution, the clearer and more detailed the image. However, one should not forget that on a screen with small physical dimensions, but with a higher resolution, the standard font and interface elements seem too small.
The higher the refresh rate, the smoother and more dynamic the image. For many years, LCD matrices supported only 60 Hz, but models with a higher refresh rate gradually appeared.
In laptop computers, two fundamentally different screen technologies can be used: liquid crystal LCD and organic OLED.
Depending on the implementation and manufacturing technology, the following LCD screens are available:
1) TN (Twisted Nematics) is the simplest and cheapest technology, characterized by a high pixel switching speed, but low viewing angles and relatively low contrast; usually if the manufacturer indicates TFT technology, it is TN;
2) IPS (In-Plane Switching). a more complex and expensive technology that provides excellent viewing angles and good color reproduction, but the worst performance in contrast and pixel switching speed is Hitachi’s development;
3) PLS (Plane Line Switching). a technology similar to IPS, but developed by Samsung;
4) MVA (Multi-domain Vertical Alignment) and other VA variants. an alternative technology that provides the best contrast and normal viewing angles, but has a low pixel switching speed and not the most ideal color reproduction.
OLED (AMOLED) technology is fundamentally different from LCD in that instead of liquid crystal cells that act as controlled shutters in front of the backlight, the cells themselves emit light in OLED. Thanks to this, OLED has no problems either with viewing angles or with response time, but the problem of flickering and burning out of the screen remains. Mobile devices use AMOLED active matrix technology in various implementations.
Initially, the surface of the screens of laptops and other similar devices was made matte. to eliminate glare that interferes with the work. However, due to the scattering of part of the emitted light, the image is less bright and saturated. Elimination of the additional coating leads to an increase in the brightness and contrast of the image, however, the anti-glare properties are lost. It is believed that for multimedia laptops, screens with a glossy (mirror) surface without a matte coating are preferable, and for working laptops. matte (anti-glare).
The touch screen responds to touch of a finger. There are several types of technologies that allow you to implement a touch screen.
1. Resistive technology is based on measuring the resistance between the screen and the membrane deposited on top of it. At the point of pressing, the membrane is pressed against the screen, as a result of which the resistance decreases. This technology is cheap and reliable, it records clicks with any solid object, but it has a number of disadvantages: the screen thickness increases, the brightness and color reproduction decrease, a certain effort is required to operate. In addition, it is difficult for a resistive screen to implement multi-touch, especially for more than two fingers.
2. Capacitive (projection-capacitive) technology is devoid of most resistive disadvantages. It uses the principle of measuring the capacitance formed by the lower conductive layer, a layer of glass and an object pressed against the glass. The absence of a membrane deposited on top removes restrictions on the force of pressing, however, a capacitive screen reacts only to a conductive object (for example, a finger). Capacitive screens are used in the vast majority of mobile devices.
3. The induction screen requires the use of a special pen. Due to the ability to measure the force of pressure, it is usually used in graphic tablets.
4. The infrared screen uses the principle of scanning invisible infrared rays propagating above the surface of the screen. It is used where high accuracy is not needed, but it is advisable to get rid of any additional layers of the screen, for example, in e-books based on E-Ink.
5. Multi-touch technology (from the English Multi-touch. “multiple touch”) provides simultaneous determination of the coordinates of two or more touch points, which allows you to change the image scale on the screen, rotate objects and perform various additional functions.