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LED display

An LED display and LED chip technology, applied in the directions of instruments, refractors, reflectors, etc., can solve the problems of single luminous color of LED display, limited color display, high light attenuation efficiency of LED display, etc.

Active Publication Date: 2012-03-28
DALIAN LUMINGLIGHT SCIENCE & TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The LED display realized by this technology has a single luminous color, and because the phosphor powder and colloid are mixed and filled in the reflective cavity, under the dual effects of LED junction temperature and colloid aging, the light attenuation efficiency of the LED display is large and the service life is short
[0005] Patents US2007139957A1, US2007 / 0116224A1, WO2006068141A1, CN1680851A, and CN2752889Y all describe backlight modules using LED arrays as light sources. This method is very limited in obtaining white light sources, and only relies on LEDs with three primary colors of R, G, and B. The uniformity of the white light obtained is poor, especially when making smaller displays such as instruments and meters, it is more difficult
Moreover, it is also very limited in color display, which is limited to the color of light that can be emitted by existing LEDs.
[0006] The above-mentioned LED display patents are largely limited by the LED devices and phosphors used and the manufacturing process, and cannot achieve other intermediate colors other than red, green, blue and white; especially if they are prepared For white LEDs, the method of producing white light by mixing phosphors and colloids on the chip will be limited by many existing white LED preparation technology patents, making it difficult to promote and use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] This example can be found in the attached figure 1 , select the uniform light diffusion film / plate 1 of PE material, use the coloring material 11 to prefabricate the pattern on the uniform light diffusion film / plate 1, and the place that needs to emit light is blank; the fluorescent powder 9 with the emission wavelength of YAG:Ce of 540nm and The epoxy resin is mixed evenly, and the fluidity is adjusted with a diluent; the evenly mixed phosphor is overprinted on the blank pattern on the uniform light diffusion film / plate 1 by screen printing, and dried.

[0039] Circuit board 5 uses PCB board, covers white reflective layer 8 on circuit board 5, and reflective layer 8 is positioned at the position that will weld LED chip 7 according to the design of pattern and reflective cavity 3 bottom centers, and area is larger than the bottom of reflective cavity 3. The blue LED chip 7 with emission wavelength of 465nm is welded on the circuit board 5 according to the design of the ...

Embodiment 2-14

[0045]The structure and process of the LED display are the same as in Embodiment 1. In Embodiments 2-14, LED chips 7 corresponding to the light guide port and the reflection cavity are respectively welded on the circuit board 5, and the emission spectrum peak wavelengths of the LED chips 7 are shown in the table respectively. 1; the phosphor powder 9 is covered on the blank pattern prefabricated on the back of the uniform light diffusion film / plate 1, and the type of phosphor powder 9 and the peak wavelength of the emission spectrum are shown in Table 1 respectively.

[0046] When the power is turned on, the LED chip 7 emits light with the peak wavelength of the emission spectrum as shown in Table 1. The light passes through the reflection cavity 3 and the light guide port 2, and directly shines on the prefabricated fluorescent powder 9 on the uniform light diffusion film / plate 1. Formed pattern and number, and emit the light of the corresponding emission spectrum peak waveleng...

Embodiment 15

[0051] Using the same structure and process as in Example 1, the circular pattern on the uniform light diffusion film / plate 1 as shown in the figure uses Sr that can be effectively excited by 450nm and emit 630nm 2 Si 5 N 8 :Eu 2+ Phosphor powder 9, the triangular pattern adopts Sr which can be effectively excited at 460nm and emit at 550nm 2 SiO 4 :Eu 2+ Phosphor powder 9, digitally adopts Sr that can be effectively excited at 470nm and emit at 570nm 3 SiO 5 :Eu 2+ Phosphor powder 9, the characters "Up" and "Down" use SrAl that can be effectively excited at 390nm and emit at 513nm 2 o 4 :Eu 2+ phosphor powder9. On the circuit board 5 corresponding to the circular pattern in the figure, solder an LED chip 7 with a peak emission wavelength of 450nm; and correspondingly, solder an LED chip 7 with a peak emission wavelength of 460nm on the circuit board 5 corresponding to the triangular pattern, On the circuit board 5 corresponding to the digital pattern, the LED chip ...

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PUM

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Abstract

The invention relates to an LED display which comprises a fixed framework, a circuit board, an LED chip, a reflecting cavity, a light guide opening, reflecting layers, fluorescent powder and a uniform-light diffusion film / board; the fluorescent powder is coated under a pattern on the back side of the uniform-light diffusion film / board, the uniform-light diffusion film / board is positioned above thelight guide opening, the position of the pattern corresponds to the position of the light guide opening, the light guide opening is positioned above the reflecting cavity, the circuit board is positioned below the reflecting cavity, the LED chip is positioned on the circuit board which mutually corresponds to the central position at the bottom of the reflecting cavity, the white reflecting layersare coated around the chip, in the area which corresponds to the bottom of the reflecting cavity and on the circuit board, and the reflecting cavity is filled with organic resin containing scatteringmaterial; the fluorescent powder is excited to emit light and is compound with the light emitted by the LED chip and the light with various colors is displayed on the pattern of the uniform-light diffusion film / board. The LED display has the advantages of high luminous efficiency, various light-emitting colors, uniform light, anti-aging, and the like and is suitable for the large-scale batch operation and production as well as the special assembly.

Description

technical field [0001] The invention relates to an LED display, in particular to an LED display which uses an LED chip as an exciting light source and a fluorescent powder as a light conversion material, which is combined with light emitted by the LED chip to realize display, and belongs to the field of display and optoelectronics. Background technique [0002] LED displays have been widely used on display panels of instruments, meters, and household appliances, and can display static or dynamic patterns or images at fixed positions. But all there is certain limitation in prior art. [0003] For example, the utility model patent CN2563676Y, which improves the structure and manufacturing method of the LED display, is characterized in that the LED used is a chip LED, and the reflection cavity is not filled with epoxy resin. However, the luminous colors of LED displays are greatly limited to the luminous colors of the LEDs used, which are basically the luminous colors of exist...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F21V5/08F21V9/10F21V7/22G09F9/33F21V13/00F21Y101/02F21V9/40F21Y115/10
CPCG09F9/3023
Inventor 胡大强夏威辛易肖志国
Owner DALIAN LUMINGLIGHT SCIENCE & TECHNOLOGY CO LTD