High color LED lighting is a bright future

According to the Nikkei BP news agency reported that SHARP released a 13% higher than the company's original color high color GM4BN653C0A white LED". As a high color products, "brightness reached the highest value in the industry" (the company). White LED package for 0.6mm thick, suitable for small and medium-sized LCD panel backlight. The day before, the high color white and high brightness characteristics of LED technology, with electronic components cause the part of the company to the LED business planning department CE department head Uemura Toyode.

- what are the benefits of using this white LED?

Uemura: can substantially improve the performance of color LCD panel. The white LED through the blue chip LED combined with the use of green and red phosphor material, obtained a white light, so the peak luminous spectrum in the blue, green and red. By combining the RGB color filter installed on the LCD panel, the image can be displayed with a high purity color. The current mainstream white LED by the blue LED chip and yellow phosphor material to obtain a pseudo white, and the white LED contrast, significantly improve the color of red and green performance, LCD panel color range can be expanded ten percent. Has been applied to some portable terminals, related products have been listed.

Except for the mobile phone to display exquisite image, many manufacturers will be considered with high color type white LED light source backlight for game machine. The more time you need to browse the screen terminal, the user can feel the difference in color.

- high color and lighting products. What is the difference between a product with a backlight?

Zhi Cun: there is a great difference between the emission spectrum. Like this kind of back light products, blue peak and green peak, as well as between the green peak and red peak, there is a clear light intensity trough. In other words, in addition to close to the blue, green and red light, try to avoid the issue of other colors of light. Because it is more suitable for the performance of the RGB color LCD panel. The more light outside the RGB, the lower the color purity of the image. The new product is also used to deepen the valley of the phosphor material. The new product is characterized by the ability to deepen the peaks of green and red peaks. In addition, in order to make the light emitted by the lighting products closer to natural light, we should try to avoid the occurrence of luminous intensity trough.

- the color of the high color type is lower than that of the pseudo white. Does the new product also have brightness difference?

Zhi Cun: indeed, high color compared with pseudo white, even using the same blue chip LED, the brightness will decrease by about 25%. Brightness of 2.2 ~ 2.4cd pseudo white products have been listed, there are customer feedback that the brightness of the high color 1.5cd original product is very dark".

But the brightness of products has increased to 1.7cd, people don't think so "dark". The reason is that, although from the numerical point of view, the brightness is lower than the pseudo white type products, but can fully meet the needs of brightness.

- what improvements will be made to increase the brightness from 1.5cd to 1.7cd?

Uemura: a total of three improved most. The color conversion efficiency, encapsulation efficiency and the luminous efficiency of blue LED chip were improved. Among them, the efficiency improvement effect of phosphor material is the most obvious. The specific situation is not convenient to disclose, but is jointly developed and materials manufacturers.

Earlier, high color products with a green phosphor and a red phosphor has the problem of low reliability. Including the wavelength of light will change with the temperature, as well as the quality of the poor after the deterioration of the situation. This product does not exist these problems.

Package, in order to effectively remove the blue LED chip mounted on the inside of the light, the high reflectivity inside the package. Blue LED chip intended to purchase from outside. As for which company procurement, the current inconvenience, but certainly will be purchased from a number of companies. Chip size of 500 ~ 600 m x 240 m or so, is the standard size, there is no special order for the white LED chip. In addition, the company will try to reduce the cost of the blue chip LED components, so the lighting products used in the blue LED chip and backlight products.

- many companies have high performance color white LED. Xia Puneng is the first to achieve higher brightness is the reason?

Zhi Cun: there should be two reasons. One is a joint development with fluorescent material manufacturers. The new product is used to produce more than 1 years of fluorescent material developed. Another reason is the effect of domestic demand is obvious. The company has LCD panel business, as well as the assembly business, so the LED development team can directly get the LCD panel backlight light source required performance indicators. As a result, it is possible to quickly establish a high performance white LED target. In addition to the above reasons, the development focus to high color white LED, is our advantage. High color products accounted for nearly half of the company's white LED sales. This ratio may be much higher than other companies. This shows that we attach great importance to high color products.

So much high color white LED is a reason. LED demand from the future point of view, the role of high color products are very good prospects. We expect that the size of the annual demand for LED will reach 520 billion yen, in the year of will be expanded to 900 billion yen. It should be emphasized that the LCD TV backlight products and lighting products market size will be expanded. I