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Flat lighting source, luminance correcting circuit, luminance correcting method and liquid crystal display

A technology of brightness correction and surface lighting, applied to static indicators, instruments, optics, etc.

Inactive Publication Date: 2007-05-30
NEC LCD TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also, in the backlight control device disclosed in Patent Reference 3, the brightness of light emitted from the LED is controlled according to the brightness in the peripheral position of the liquid crystal panel, and therefore, the purpose of the conventional invention is different from the purpose of the present invention, and by This cannot solve the above-mentioned problems by this conventional invention

Method used

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  • Flat lighting source, luminance correcting circuit, luminance correcting method and liquid crystal display
  • Flat lighting source, luminance correcting circuit, luminance correcting method and liquid crystal display
  • Flat lighting source, luminance correcting circuit, luminance correcting method and liquid crystal display

Examples

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no. 1 example

[0063] Fig. 1 is a block diagram showing the electrical configuration of main parts of a surface lighting source according to a first embodiment of the present invention. The surface illumination light source of the present embodiment is used as a backlight of a transmissive liquid crystal panel installed in a liquid crystal display panel, and as shown in FIG. LED drive / correction circuit 73 and drive / detection circuit 74 . In FIG. 1, only one LED 71 is shown, however, the surface illumination light source may be constituted by a plurality of LEDs used as a backlight and arranged in such a manner as to form a flat surface. In a one-to-one relationship, each photodiode 72 is installed for each LED 71, and each photodiode 72 receives light emitted from each LED 71, and generates light having a brightness corresponding to the received light. level of the luminance detection voltage "a". In a one-to-one relationship, each drive / detection circuit 74 is installed for each photodio...

no. 2 example

[0077] 5 is a cross-sectional view showing the configuration state of main parts of a surface lighting source of a second embodiment of the present invention, and the same reference numerals denote parts having the same functions as those in the first embodiment shown in FIG. 4 . In the surface illumination light source of the second embodiment, as shown in FIG. 5, each of the LED 71, the photodiode 72, the LED drive / correction circuit 73, and the drive / detection circuit 74 are mounted in the same package. 76 in. In this package 76, terminals and the like (not shown) for connection with external components are mounted. According to the surface illumination light source of the second embodiment, each LED 71 is provided in a one-to-one relationship near each photodiode 72 in the same package 76, and each LED drive / correction circuit 73 and each LED drive / correction circuit 73 are integrally formed. The drive / detection circuit 74, and thus, the second embodiment has the same ad...

no. 3 example

[0079] 6 is a sectional view showing the arrangement state of main parts of a surface illumination light source of a third embodiment of the present invention, and the same reference numerals denote parts having the same functions as those in the second embodiment shown in FIG. 5 . In the light source of the third embodiment, as shown in FIG. 6, each photodiode 72, each LED drive / correction circuit 73, and each drive / detection circuit 74 are integrally formed as one IC (Integrated Circuit) 77 to operate. As in the case of the first embodiment, each LED 71 is arranged in a one-to-one relationship in the vicinity of the photodiodes 72, and thus also in the third embodiment, the same advantages as those obtained in the first embodiment can be realized. .

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PUM

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Abstract

A flat lighting source is provided which is capable of applying illuminating light to an entire display region of a display panel. A current or voltage is supplied from each LED (Light Emitting Diode) driving / correcting circuit to each LED. Part of light emitted from each of the LEDs is converted into electrical signals and a resistance value of each photodiode decreases in proportion to luminance. If luminance of light emitted from each of the LEDs increases, a resistance value of each of the photodiodes decreases while the luminance of light emitted from each of the LEDs decreases. The resistance value is fed back to each of the LED driving / correcting circuits which changes a driving current or a driving voltage so that luminance of light emitted from each of the LEDs corresponds to a luminance setting voltage. The photodiode is mounted in a one-to-one relationship for every LED.

Description

[0001] This application claims priority from Japanese Patent Application No. 2005-337871 filed on November 22, 2005, which is hereby incorporated by reference. technical field [0002] The present invention relates to a surface lighting source, a brightness correction circuit and a brightness correction method used in the surface lighting source, and a liquid crystal display, especially when it is required to provide lighting light with uniform brightness to the entire display area of ​​the display panel It relates to a surface illumination light source suitably used when (as in the case of a liquid crystal display device that provides illumination light through a backlight), and relates to a luminance correction circuit and a luminance correction method used in the surface illumination light source. Background technique [0003] Generally, CCFLs (Cold Cathode Fluorescent Lamps) have been used as backlights for liquid crystal display devices in many cases. However, in recent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1335G02F1/133G09G3/20
CPCG02F1/133603G09G2360/14G09G2320/041G02F2001/133612G09G3/3426G09G2320/0633G02F1/133612G02F1/133G02F1/1335
Inventor 近藤祐司本保信明
Owner NEC LCD TECH CORP