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Planar light source device and display device using the same

A light source device, planar technology, applied in the direction of point light source, light source, electric light source, etc., can solve the problems of increased assembly steps, higher production costs, and higher costs, and achieve the effect of stable chromaticity

Inactive Publication Date: 2006-11-29
MITSUBISHI ELECTRIC CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, in the case where a dedicated optical sensor is separately installed on the planar light source device, there is a problem in that the number of parts of the planar light source device increases and the number of assembly steps increases, so the production cost becomes high.
In addition, since the optical sensor itself is also expensive, there is a problem that the cost of the planar light source device itself is increased by adding an optical sensor.

Method used

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  • Planar light source device and display device using the same
  • Planar light source device and display device using the same
  • Planar light source device and display device using the same

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Embodiment approach 1

[0023] In this embodiment mode, a mode in which a planar light source device is used as a backlight of a liquid crystal display device will be described. However, the planar light source device of the present invention is not limited to the above-described forms. first, figure 1 It is an exploded perspective view showing the structure of the liquid crystal display device of this embodiment. figure 1 The illustrated liquid crystal display device is provided with: a liquid crystal display panel 10 for writing and displaying a desired image in pixels; and a backlight 20 for irradiating light from the back of the liquid crystal display panel 10 . The liquid crystal display panel 10 holds liquid crystals between opposing substrates 11 , and in order to drive the liquid crystals, TFTs (Thin Film Transistor: Thin Film Transistors) (not shown) are formed in a matrix on one substrate 11 . Furthermore, pixels (not shown) connected to TFTs are also formed in a matrix. Furthermore, the...

Embodiment approach 2

[0062] Figure 9 It is a figure which shows the structure of the light source unit 28 of the planar light source device of this embodiment. Figure 10 Yes Figure 9 A wiring diagram of the light source unit 28 is shown. In the light source unit 28 of this embodiment, a row of RGB light emitting diodes 26 is mounted on a rectangular circuit substrate 27 , and furthermore, light emitting diodes 31 having longer wavelengths than the R light emitting diodes 26 are mounted. exist Figure 9 Among them, the light-emitting diode 31 is arranged on the right side of the third light-emitting diode 26 on the left side and the left side of the third light-emitting diode 26 on the right side. Moreover, in this embodiment, the infrared light-emitting diode 31 of IR (infrared) whose main wavelength is infrared wavelength (780 nm or more) is used. In addition, when expressing Figure 9 IR is indicated in the circle of the LED 31 .

[0063] One IR light-emitting diode 31 may be attached t...

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Abstract

A planar light source device includes a light source section having a plurality of light emitting diodes as a light source, and a light guiding plate guiding light from the light source section to emit planar light. The light emitting diodes being turned off detect the quantities of light from the other light emitting diodes, and adjust the quantities of light emission of the other light emitting diodes based on the detected quantities of light.

Description

technical field [0001] The present invention relates to a planar light source device and a display device using the same, and particularly relates to a planar light source device using light emitting diodes and a display device using the same. Background technique [0002] Conventionally, a backlight for a liquid crystal display device used in a computer or the like is known as a planar light source device using a light emitting diode (LED: Light Emitting Diode) as a light source. This surface light source device is composed of a light guide plate for confining light and a light source unit. Furthermore, the light guide plate is formed of transparent resin with a high refractive index, such as polycarbonate resin or acrylic resin. The light emitting part has a plurality of light emitting diodes mounted on the substrate, and is arranged to face the side surface of the light guide plate. [0003] However, in order to obtain stable luminance, it is necessa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/13357H01L33/00G09G3/34G02F1/1335F21S2/00F21V8/00F21Y101/02H05B37/02
CPCG09G2360/145H05B33/0818G02B6/0068H05B33/0869G09G2320/064H05B33/0857G09G3/342H05B33/0803G09G3/3413H05B45/22H05B47/16Y02B20/40
Inventor 境诚司米田俊之
Owner MITSUBISHI ELECTRIC CORP
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