question: Why do small screens have a better resolution than bigger screens?
comment: You're looking at just 1 phone, and just 1 laptop screen. Look at ALL screens, and you will see you can get just about any screen resolution in any size you want. We now have tv's that are 8k, which is 4320p, and you can get them in 72" at any place that sells new tv's. However, you correct if you are thinking about it in terms of "pixels per square inch" of screen. In that context, yes, larger screens tend to have fewer pixels per square inch. And as /u/gman5495 pointed out, that is because you will be much farther away from a big screen than a little screen. This is done so that from your viewing perspective, everything looks similar.
passages: BULLET::::- Display resolution: the number of pixels in each dimension on a display. In general a higher resolution will yield a clearer, sharper image.
   An example of pixel shape affecting "resolution" or perceived sharpness: displaying more information in a smaller area using a higher resolution makes the image much clearer or "sharper". However, most recent screen technologies are fixed at a certain resolution; making the resolution lower on these kinds of screens will greatly decrease sharpness, as an interpolation process is used to "fix" the non-native resolution input into the display's native resolution output.
   BULLET::::- Spatial performance: For a computer monitor or some other display that is being viewed from a very close distance, resolution is often expressed in terms of dot pitch or pixels per inch, which is consistent with the printing industry. Display density varies per application, with televisions generally having a low density for long-distance viewing and portable devices having a high density for close-range detail. The Viewing Angle of an LCD may be important depending on the display and its usage, the limitations of certain display technologies mean the display only displays accurately at certain angles.
   The TV image is composed of many lines of pixels. Ideally, the TV watcher sits far enough away from the screen that the individual lines merge into one solid image. The watcher may sit even farther away and still see a good picture, but it will be a smaller portion of their visual field. However, note that viewing behavior is dependent on screen size. With increasing screen sizes, visual exploration is enhanced with an increased number of fixations of shorter duration and a tendency to view only the center of the display.
  
  Section::::Display sizes of common TVs and computer monitors.
   Section::::Optimal screen size and viewing distance.
   Section::::Comparison of television display technologies.
  
  Section::::Comparison of television display technologies.:CRT.
  
  Though large-screen CRT TVs/monitors exist, the screen size is limited by their impracticality. The bigger the screen, the higher the weight, and the deeper the CRT.
  
  A typical 32-inch television can weigh about 50 lbs or more. The biggest ever CRT was about 60 inches, weighed 250 lbs.
  
  SlimFit televisions (40 inch, 80 lbs) exist, but are not common.
  
  Section::::Comparison of television display technologies.:LCD.
  
  BULLET::::- Advantages:
  
  BULLET::::- Slim profile
  
  BULLET::::- Lighter and less bulky than rear-projection televisions
   In theory, some resolutions could work well, if they are exact multiples of smaller image sizes. For example, a 1600×1200 LCD could display an 800×600 image well, as each of the pixels in the image could be represented by a block of four on the larger display, without interpolation. Since 800×600 is an integer factor of 1600×1200, scaling should not adversely affect the image. But in practice, most monitors apply a smoothing algorithm to all smaller resolutions, so the quality still suffers for these "half" modes.
   Since the late 2000s, CRTs have been largely superseded by newer "flat panel" display technologies such as LCD, plasma display, and OLED displays, which in the case of LCD and OLED displays have lower manufacturing costs and power consumption, as well as significantly less weight and bulk. Flat panel displays can also be made in very large sizes; whereas was about the largest size of a CRT television, flat panels are available in and even larger sizes.
  
  Section::::History.
   Most LCD monitors are able to inform the PC of their native resolution using Extended display identification data (EDID); however, some LCD TVs, especially those with 1366x768 pixels, fail to provide their native resolution and only provide a set of lower resolutions, resulting in a less than pixel perfect output.
   Section::::Considerations.
   The most common source of LDTV programming is the Internet, where mass distribution of higher-resolution video files could overwhelm computer servers and take too long to download. Many mobile phones and portable devices such as Apple’s iPod Nano, or Sony’s PlayStation Portable use LDTV video, as higher-resolution files would be excessive to the needs of their small screens (320×240 and 480×272 pixels respectively). The most recent generation of iPod Nanos have LDTV screens, as do the first three generations of iPod Touch and iPhone (480×320).
   BULLET::::- 8K UHD (7680 × 4320 progressive scan)
  
  Section::::Current standards.:Computer monitors.
  
  Computer monitors have traditionally possessed higher resolutions than most televisions.
  
  Section::::Current standards.:Computer monitors.:2000s.
  
  , 1024 × 768 eXtended Graphics Array was the most common display resolution. Many web sites and multimedia products were re-designed from the previous 800 × 600 format to the layouts optimized for 1024 × 768.
   The eye's perception of "display resolution" can be affected by a number of factors see image resolution and optical resolution. One factor is the display screen's rectangular shape, which is expressed as the ratio of the physical picture width to the physical picture height. This is known as the aspect ratio. A screen's physical aspect ratio and the individual pixels' aspect ratio may not necessarily be the same. An array of 1280 × 720 on a display has square pixels, but an array of 1024 × 768 on a 16:9 display has oblong pixels.
   BULLET::::- As an inherently digital device, the LCD can natively display digital data from a DVI or HDMI connection without requiring conversion to analog. Some LCD panels have native fiber optic inputs in addition to DVI and HDMI.
  
  BULLET::::- Many LCD monitors are powered by a 12 V power supply, and if built into a computer can be powered by its 12 V power supply.
  
  BULLET::::- Can be made with very narrow frame borders, allowing multiple LCD screens to be arrayed side-by-side to make up what looks like one big screen.
  
  Section::::Advantages and disadvantages.:Disadvantages.
   Native resolution
  
  The native resolution of a LCD, LCoS or other flat panel display refers to its single fixed resolution. As an LCD consists of a fixed raster, it cannot change resolution to match the signal being displayed as a CRT monitor can, meaning that optimal display quality can be reached only when the signal input matches the native resolution. An image where the number of pixels is the same as in the image source and where the pixels are perfectly aligned to the pixels in the source is said to be "pixel perfect".
   Section::::Current standards.:Computer monitors.:Evolution of standards.
   Smartphones use small displays, but modern smartphone displays have a larger PPI rating, such as the Samsung Galaxy S7 with a quad HD display at 577 PPI, Fujitsu F-02G with a quad HD display at 564 PPI, the LG G6 with quad HD display at 564 PPI or – XHDPI or Oppo Find 7 with 534 PPI on 5.5" display – XXHDPI (see section below). Sony's Xperia XZ Premium has a 4K display with a pixel density of 807 PPI, the highest of any smartphone as of 2017.
  
  Section::::Named pixel densities.
   BULLET::::- Brightness: The amount of light emitted from the display. It is sometimes synonymous with the term "luminance", which is defined as the amount of light per area and is measured in SI units as candela per square meter.
   The resolution of the human eye (with 20/20 vision) is about one minute of arc. For full HDTV resolution, this one minute of arc implies that the TV watcher should sit 4 times the height of the screen away. At this distance the individual pixels can not be resolved while simultaneously maximising the viewing area. So the ideal set size can be determined from the chart below by measuring the distance from where the watcher would sit to the screen in centimeters (or inches), dividing that by 4, and comparing with the screen heights below. At this distance, viewers with better than 20/20 vision will still be able to see the individual pixels. If the user is replacing a standard definition TV with an HDTV this implies that the best visual experience will be with a set that is twice as tall as the standard definition set. As the average size LCD TV being sold is now 38", which is only about 15% taller than a 27" standard definition TV, this means that most consumers buy HDTV sets that are smaller than what they could utilize. Cost and budget also limit screen size. 
   BULLET::::- The closest a hand held screen can comfortably be viewed is 250mm (approx. 10 inches)
  
  Section::::Smallest Visible Pixel Size for a Hand Held Device.
  
  The smallest visible pixel size ("p") for a hand held device can be calculated assuming the screen is held at a comfortable distance (250mm) for someone with "normal" vision (able to see detail at a 1/60 degree angle):
  
  It can therefore be concluded that the pixel size for the Hitachi DX07 screen is only 5% greater than the smallest possible for practical use.
   LCDs, along with OLED displays, are manufactured in large sheets of glass whose size has increased over time. Several displays are manufactured at the same time, and then cut from the sheet of glass, also known as the mother glass. The increase in size allows more displays or larger displays to be made, just like with increasing wafer sizes in semiconductor manufacturing. The glass sizes are as follows:
   For example, if the image of a ship of length , viewed side-on, is 500 pixels long, the nominal resolution (pixel size) on the side of the ship facing the camera is . Now sub-pixel resolution of well resolved features can measure ship movements which are an order of magnitude (10×) smaller. Movement is specifically mentioned here because measuring absolute positions requires an accurate lens model and known reference points within the image to achieve sub-pixel position accuracy. Small movements can however be measured (down to 1 cm) with simple calibration procedures. Specific fit functions often suffer specific bias with respect to image pixel boundaries. Users should therefore take care to avoid these "pixel locking" (or "peak locking") effects.
   BULLET::::- Poor black level: Some light passes through even when liquid crystals completely untwist, so the best black color that can be achieved is varying shades of dark gray, resulting in worse contrast ratios and detail in the image. This can be mitigated by the use of a matrix of LEDs as the illuminator to provide nearly true black performance.
  
  BULLET::::- Narrower viewing angles than competing technologies. It is nearly impossible to use an LCD without some image warping occurring.
  
  BULLET::::- LCDs rely heavily on thin-film transistors, which can be damaged, resulting in a defective pixel.
   BULLET::::- Color reproduction/gamut: The range of colors that the display can accurately represent.
  
  Section::::Display technologies.
  
  Section::::Display technologies.:LCD television.
   Large-screen television technology developed rapidly in the late 1990s and 2000s. Various thin screen technologies are being developed, but only the liquid crystal display (LCD), plasma display (PDP) and Digital Light Processing (DLP) have been released on the public market. A video display that uses large-screen television technology is called a jumbotron. These technologies have almost completely displaced cathode ray tubes (CRT) in television sales, due to the necessary bulkiness of cathode ray tubes. However, recently released technologies like organic light-emitting diode (OLED) and not-yet released technologies like surface-conduction electron-emitter display (SED) or field emission display (FED) are making their way to replace the first flat screen technologies in picture quality. The diagonal screen size of a CRT television is limited to about 40 inches because of the size requirements of the cathode ray tube, which fires three beams of electrons onto the screen, creating a viewable image. A larger screen size requires a longer tube, making a CRT television with a large screen (50 to 80 inches) unrealistic because of size. The aforementioned technologies can produce large-screen televisions that are much thinner.
  
presuppositions: Small screens have a better resolution than large screens.
corrections: Any screen resolution can be implemented into just about any size television screen. 
raw_presuppositions: Small screens have a better resolution than large screens. small screens have a better resolution than bigger screens.
raw_corrections: Any screen resolution can be implemented into just about any size television screen.  Any screen resolution can come in any size you want.