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Backlight device and liquid crystal display device

A liquid crystal display device and backlight technology, applied in the direction of light source, electric light source, electric light source, etc., can solve problems such as brightness difference and uneven brightness, and achieve the effect of eliminating uneven brightness or uneven color

Inactive Publication Date: 2008-12-03
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, when the input voltage V changes, or due to the difference in the resistance value R, another V F There are differences (for example, here V F ≈1.6~1.8V), it is easy to produce differences in brightness between LED arrays, which will become the cause of uneven brightness, etc.
In particular, the forward voltage V F The difference may occur for each LED, as mentioned above, by connecting a large number of LEDs in series, the current I flowing through each LED array F The possibility of discrepancies between them increases, which is likely to contribute to problems such as uneven brightness

Method used

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  • Backlight device and liquid crystal display device
  • Backlight device and liquid crystal display device
  • Backlight device and liquid crystal display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 3

[0101] FIG. 7 shows a configuration example in which LED arrays of one line connected in series are arranged in a twisted shape as Embodiment 4 of the present invention.

[0102] As a specific configuration, a plurality of LEDs connected in series via a flexible cable are arranged across two columns from one side coil constituted by a drive circuit board-shaped shunt circuit. Then, connect three LEDs (Z1 to 3) connected in series from the end of the first column on the substrate, and the second LED located in the horizontal direction (the direction in which LEDs that are continuously connected in series in the same column) to the LEDs. The three series-connected LEDs (Z4-6) of the columns are electrically connected, and then connected to the LEDs (Z7-) of the first column.

[0103] Using this as a repeating unit, after many (N) times of LEDs are connected in series in the horizontal direction, the direction of the polarity of the previous LEDs is reversed through the wiring pa...

Embodiment 4

[0107] Next, Embodiment 4 of the present invention shown in FIG. 8 will be described.

[0108] In this embodiment, the example shown is to make the aforementioned embodiment 1 ( Figure 4 ) extension, for the LED array mounting row provided to mount a plurality of LEDs in a row on the LED substrate, the 2-wire part of the LED array connected in series from each coil of the shunt circuit is alternately exchanged with respect to the parallel direction of the mounting row Each line has a turn-back portion, and for other LED array mounting columns on the LED substrate, the parallel direction of each LED line relative to the mounting column is alternately mounted.

[0109] That is, the two coils 442a and 442b of the shunt circuit 442 are connected to terminals provided at the ends of the LED substrate, and the coil 442a on one side is connected in series to three consecutive LEDs (Z1-3) from the end of the first row. connect. The coil 442b on the other side connects the LEDs (Z4-...

Embodiment 5

[0114] FIG. 9 illustrates another embodiment 5 related to the present invention.

[0115] In this embodiment, the example shown is the same as Embodiment 4, so that the aforementioned Embodiment 1 ( Figure 4 ) extension. Specifically, for two parallel LED array mounting rows provided to mount a plurality of LEDs in a row on the LED substrate, the two-wire part of the LED array connected in series to each coil of the shunt circuit is compared to the parallel arrangement of each row. The direction is alternately exchanged, and each line has a turn-back portion. For the LED array installation columns with two parallel columns on the LED substrate, the parallel direction of each LED line relative to each column is alternately installed.

[0116] That is, the two coils 442a and 442b of the shunt circuit 442 are connected to terminals provided at the ends of the LED substrate, and the coil 442a on one side is connected in series to three consecutive LEDs (Z1-3) from the end of the...

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Abstract

A substantially constant current is supplied from a shunt circuit to each line in order to control light emission of light emitting diodes. A predetermined number of light emitting diodes are arranged in series as a set. Sets of the light emitting diodes to be connected to a first line and the light emitting diodes to be connected to a second line are arranged in a line on the same straight line on a substrate. The substrates are connected adjacently in the row direction, so that the sets of the light emitting diodes to be connected to the first line and the light emitting diodes to be connected to the second line are alternately arranged. Thus, it is possible to provide a backlight device having a plurality of LED arrays capable of uniformly emitting light over the entire screen.

Description

technical field [0001] The invention relates to a backlight source device and a liquid crystal display device. Background technique [0002] Conventionally, a liquid crystal display device (LCD: Liquid Crystal Display) using liquid crystal is known as a display device for displaying images, videos, and the like. LCDs are used as many display devices for computers, mobile phones, televisions, and the like. A liquid crystal display device seals a special liquid between two glass plates, and by applying a voltage, changes the orientation of the liquid crystal molecules to increase or decrease the transmittance of light, thereby displaying images. At this time, it is known that since the liquid crystal itself does not emit light, for example, a light source such as a cold cathode fluorescent tube (CFL: Cathode Fluorescent Lamp) is provided on the back of the liquid crystal, and this light source is used as a backlight. [0003] Here, although the CFL generally used as the ligh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F21S2/00G02F1/13357G02F1/1335H01L33/00H01L33/48H01L33/50
CPCG02F1/133604F21K9/00H05B33/0821H05B33/0827G02F2001/133612G02F1/133603H05B33/0803H05B45/46H05B45/35G02F1/133612H05B35/00H05B45/00H05B45/42
Inventor 森保光洋近泽秀之清水将树
Owner SHARP KK
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