LED lighting design and development of the four directions

LED lighting design and development of the four directions

As a new type of lighting technology, LED has attracted worldwide attention. In particular, high-brightness LED has been hailed as the most valuable light source in the 21st century, and it will surely cause a new revolution in lighting. Since the emergence of white LEDs, both the lighting principle and the functions have the advantage that other traditional light sources cannot match. Therefore, LED lighting has become a trend in the 21st century residential lighting field. LED will replace the traditional incandescent and fluorescent lamps, the traditional home Lighting fixtures are already facing serious challenges. The content and form of lighting design is mainly light. LED new light source promotes the innovation of lighting fixture design and development, which has changed our lighting concept to a large extent, so that we can liberate from the traditional point and line light source limitations. The language and concepts can be freely played and re-established. Luminaires have greater flexibility in visual perception and formative creative performance. Home lighting will be more energy-efficient, healthier, artistic and humane.

First, energy-saving research data show that, because LED is a cold light source, semiconductor lighting itself does not have any pollution to the environment, compared with incandescent lamps, fluorescent lamps, power-saving efficiency can reach more than 90%. At the same brightness, the power consumption is only 1/10 that of ordinary incandescent lamps and 1/2 of fluorescent lamps. If we use LED to replace 50% of our current traditional lighting, the electricity savings per year in China will be equivalent to the sum of the power generation of a Three Gorges power station, and its energy-saving benefits will be considerable.

Second, healthy LED is a green light source. LED light is DC driven, no flash; no infrared and ultraviolet components, no radiation pollution, high color rendering and strong light direction; good dimming performance, no visual error when the color temperature changes; cold light source Low heat, safe touch; these are not reachable by incandescent and fluorescent lights. It can not only provide comfortable lighting space, but also can meet people's physiological health needs. It is a healthy light source that protects eyesight and protects the environment.

Because the power of a single LED is relatively low, and the brightness is low, it is not suitable to use it alone. It is a promising LED lighting fixture that has a wide range of application prospects to assemble a plurality of LEDs together. The luminaire designer can determine the shape of the luminaire's optical system, the number of LEDs and the size of the power according to the requirements of the lighting object and the luminous flux; it is also possible to design several LED luminaires as a combination of point light source, ring light source or surface light source. "Light source", according to the combination of "secondary light source" to design lamps.

Third, artistic light color constitutes the basic element of visual aesthetics and is an important means to beautify the living room. The choice of light source directly affects the artistic effect of light, and LED shows unparalleled advantages in the artistic display of light color display lamps; currently, the color LED products have covered the entire visible spectrum range, and have good monochromaticity, high color purity, red and green The combination of yellow and yellow LEDs gives greater flexibility in the choice of color and grayscale (16.7 million colors). Luminaires are luminous sculptures. The form of lamps and lanterns constructed from materials, structures, forms, and textures is also an important means of displaying art. LED technology makes room lamps combine organically with science and art, breaking the border frame of traditional lamps, surpassing the inherent concept of the so-called lamp form, and the lamp design is based on the artistic creativity of visual perception and form. A new perspective to understand, understand and express the theme of light. We can more flexibly use the combination of light and dark in optical technology, the combination of light and color, the advantages of materials and structural design, increase the freedom of design to weaken the lighting function of lamps, and make lamps become a kind of visual art, creating comfortable and beautiful Light art effect. For example, a candle-like LED lamp made of semi-transparent synthetic material and aluminum can be placed on the floor, corner or table, and the concept of simplicity and ease, the visual experience and light experience conveyed by the form, let the lamps become full of interest and vitality. Living body.

IV. Human Nature Undoubtedly, the relationship between the light and the people is an eternal topic. “People saw the light and I saw the light”. It was this classic discourse that changed the understanding of the lamps by countless designers. The highest level of the lamps is the "Ultraviolet Lamp" and the highest expression of human illumination. There is no trace of common lamps in the room, so that people can feel the light but can not find the light source, reflecting the humanized design that perfectly combines light and human life. .

The LED lamps are small in size and light in weight, and can be combined with different light-colored LEDs to form a variety of soft illumination modules. They can be freely installed in the living room. The light sources of the room lighting may come from the ground, walls, windowsills, furniture, and accessories. Therefore, future lighting in the living room will no longer be limited to a single lamp, but will be transformed from a single lamp lighting to a shadowless lamp with no overall sense of lighting fixtures. Different light colors and brightness have different effects on human physiological and psychological energy. In many cases, people do not need very bright white light, and yellow light or other colors of light may be more suitable for physiological and psychological needs. Tri-color LEDs can achieve continuous conversion and selection of brightness, grayscale, and color, allowing lighting to expand white light in a general sense to multiple colors of light.

Therefore, people can set lighting effects according to the overall lighting needs (such as color, temperature, brightness, and direction, etc.) to achieve humanized intelligent control and create different indoor lighting effects. Even if there are only LED light-emitting ceilings and light-emitting wall surfaces in the living room, people can select and control the changes in brightness, grayscale, and color of light in different spaces and times according to their requirements, scene conditions, and different understandings of the environment and life. Simulate a variety of light environments to guide and improve emotions and reflect a more humanized lighting environment.

TFT LCD Module

How does TFT work?
TFT is the abbreviation of "Thin Film Transistor", generally refers to thin film liquid crystal displays, but actually refers to thin film transistors (matrix)-can "actively" control each independent pixel on the screen, which is The origin of the so-called active matrix TFT (active matrix TFT). So how exactly is the image produced? The basic principle is very simple: the Display Screen is composed of many pixels that can emit light of any color, and the purpose can be achieved by controlling each pixel to display the corresponding color. In TFT LCD, backlight technology is generally used. In order to accurately control the color and brightness of each pixel, it is necessary to install a shutter-like switch after each pixel. When the "blinds" are opened, light can pass through, and " When the shutters are closed, light cannot pass through. Of course, technically, it is not as simple as the one just mentioned. LCD (Liquid Crystal Display) utilizes the characteristics of liquid crystals (liquid when heated, and crystallized into solid when cooled). Generally, liquid crystals have three forms:
Smectic liquid crystal similar to clay
Nematic liquid crystal resembling a fine matchstick
Cholestic liquid crystal
The liquid crystal display uses filaments, and when the external environment changes, its molecular structure will also change, and thus have different physical properties-it can achieve the purpose of letting light through or blocking light-which is just like the blinds just now.
Everyone knows the three primary colors, so each pixel on the display screen needs three similar basic components described above to control the three colors of red, green, and blue respectively.
The most commonly used one is twisted nematic TFT LCD (Twisted Nematic TFT LCD). Existing technologies vary greatly, and we will cover them in detail in the second part of this article.
There are grooves on the upper and lower layers. The grooves on the upper layer are arranged longitudinally and the grooves on the lower layer are arranged horizontally. When no voltage is applied to the liquid crystal in its natural state, the light emitted from the light emitting layer of the twisted nematic TFT Display working principle diagram of Figure 2a will be twisted by 90 degrees after passing through the interlayer, so that it can pass through the lower layer smoothly.
When a voltage is applied between the two layers, an electric field is generated. At this time, the liquid crystals are aligned vertically, so the light will not be twisted-the result is that the light cannot pass through the lower layer.

(2) TFT pixel structure: The color filter is divided into red, green, and blue according to the color, which are arranged on the glass substrate to form a group (dot pitch) corresponding to a pixel. Each monochromatic filter is called It is a sub-pixel. In other words, if a TFT display supports a maximum resolution of 1280×1024, then at least 1280×3×1024 sub-pixels and transistors are required. For a 15-inch TFT display (1024×768), then a pixel is about 0.0188 inches (equivalent to 0.30mm), for an 18.1-inch TFT display (1280×1024), it is 0.011 inches (equivalent to 0.28mm) .
As we all know, pixels are decisive for the display. The smaller each pixel is, the larger the maximum resolution that the display can achieve. However, due to the limitation of the physical characteristics of the transistor, the size of each pixel of the TFT at this stage is basically 0.0117 inches (0.297mm), so for a 15-inch display, the maximum resolution is only 1280×1024.

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