The bigger the mirrors or lenses, the more light the telescope can gather. Light is then concentrated by the shape of the optics. That light is what we see when we look into the telescope.

LED light is emitted from the side to the light guide plate placed under the LCD,　and the light is extracted from the plate upward (toward the user).　 Features • The entire backlight emits light from the surface.　 • Relatively small number of LEDs to be used = low power consumption • Less uneven brightness and uniform appearance　(The backlight also emits light even in areas where there is no display.)

Because the light is passing through the lens, the surface of the lens has to be extremely smooth. Any flaws in the lens will change the image. It would be like looking through a dirty window.

Unlike a lens, a mirror can be very thin. A bigger mirror does not also have to be thicker. Light is concentrated by bouncing off of the mirror. So the mirror just has to have the right curved shape.

A telescope is a tool that astronomers use to see faraway objects. Most telescopes, and all large telescopes, work by using curved mirrors to gather and focus light from the night sky.

Edge-lit/Light-guide Slight light escapes from the unlettered black background, because the light guide plate behind the LCD uniformly illuminate.

We have LED light sources suitable for both edge-lit and direct-lit backlight. The appropriate light source can be selected according to the application and specifications.

LCDs are made visible as a luminescent display by transmitting light from the back of the LCD through the backlight.　The following describes two typical layout for LEDs, which are the light source of the backlight, used in automotive applications.

Direct-lit The direct local dimming method allows high-contrast, clear viewing without light in areas other than the text.

| Wide Color Gamut White LED | White light is achieved by mixing blue LED light with green and red phosphors.The LED light component matches the LCD color filter, resulting in particularly vivid coloring around the red area, expanding the color gamut and improving the quality. On the other hand, the power consumption tends to increase due to the lower power-to-light conversion efficiency compared to normal white LEDs.

A method in which LEDs are placed directly under the LCD display and light is directed toward the user. Features • Aggregation of area emission of each LED • The number of LEDs increases depending on the display size and the illumination area of each LED. • The brightness of the entire display can be increased according to the number of LEDs. Local dimming technology • By controlling light emission finely for each area, it is possible to light only necessary areas efficiently. • High-contrast and high-definition display is possible by de-illuminating areas where there is no display.

The LCD (Liquid Crystal Display) screen of a meter or entertainment system is a full-color display, with white LED backlight light passing through the LCD's color filter (the three primary colors of light: R: red, G: green, and B: blue).Even if the display device (LCD) is the same, the light source used for the backlight changes the display quality and power consumption characteristics.

Display devices have been used for many years as a means of HMI (Human Machine Interface) to connect humans and machines interactively, and their usage are still expanding. Automotive interiors are no exception to this trend, with an increasing amount of information being displayed,ranging from important information for safe driving to entertainment information, and this trend will continue to evolve further in the future.

But mirrors have their own problems. Have you ever looked into a spoon and noticed your reflection is upside down? The curved mirror in a telescope is like a spoon: It flips the image. Luckily, the solution is simple. We just use other mirrors to flip it back.

This image of the Crab Nebula was created with information from the Hubble Space Telescope, the Spitzer Space Telescope, the Chandra X-ray Observatory, European Space Agency's XMM-Newton and the Very Large Array. Credit: NASA, ESA, NRAO/AUI/NSF and G. Dubner (University of Buenos Aires)

The first telescopes focused light by using pieces of curved, clear glass, called lenses. So why do we use mirrors today? Because mirrors are lighter, and they are easier than lenses to make perfectly smooth.

The optics of a telescope must be almost perfect. That means the mirrors and lenses have to be just the right shape to concentrate the light. They can’t have any spots, scratches or other flaws. If they do have such problems, the image gets warped or blurry and is difficult to see. It’s hard to make a perfect mirror, but it’s even harder to make a perfect lens.

| Normal White LEDs | Normal white LEDs achieve white light by mixing blue LED light with yellow phosphor. They feature low power consumption due to their extremely high efficiency in converting power into light, and are relatively inexpensive due to the small number of constituent materials used.On the other hand, the red light component is small, so the coloring performance of the red area when transmitted through an LCD is not high.

| Normal white light | Normal white light with blue light + yellow phosphor has a low red component light, so red and reddish dislpay on the screen may appear dull.

The mirrors or lenses in a telescope are called the “optics.” Really powerful telescopes can see very dim things and things that are really far away. To do that, the optics—be they mirrors or lenses—have to be really big.

Heavy lenses are hard to make and difficult to hold in the right place. Also, as they get thicker the glass stops more of the light passing through them.

| Wide gamut white light | Wide gamut white light with blue light + green phosphor + red phosphor makes screen colors look more vivid than normal white light because of its high red component.

It is much easier to make a large, near-perfect mirror than to make a large, near-perfect lens. Also, since mirrors are one-sided, they are easier than lenses to clean and polish.

People with especially poor eyesight need thick lenses in their glasses. Big, thick lenses are more powerful. The same is true for telescopes. If you want to see far away, you need a big powerful lens. Unfortunately, a big lens is very heavy.

Space telescopes such as the Hubble Space Telescope and the Spitzer Space Telescope have allowed us to capture views of galaxies and nebulas far away from our own solar system. Set to launch in December 2021, the James Webb Space Telescope is the largest, most powerful space telescope ever built. It will allow scientists to look at what our universe was like about 200 million years after the Big Bang.

A lens, just like in eyeglasses, bends light passing through it. In eyeglasses, this makes things less blurry. In a telescope, it makes faraway things seem closer.

The number-one benefit of using mirrors is that they’re not heavy. Since they are much lighter than lenses, mirrors are a lot easier to launch into space.