CN201748359U

CN201748359U - Direct type light-emitting diode (LED) backlight source device

Info

Publication number: CN201748359U
Application number: CN2010202339436U
Authority: CN
Inventors: 姜凤山
Original assignee: Irico Group Corp
Current assignee: Irico Group Corp; Irico Group Electronics Co Ltd
Priority date: 2010-06-23
Filing date: 2010-06-23
Publication date: 2011-02-16
Anticipated expiration: 2020-06-23

Abstract

The utility model provides a direct type light-emitting diode (LED) backlight source device, which comprises a scanning electrode, a data electrode, a field effect transistor (FET), a capacitor and an LED lamp, wherein the FET comprises a grid electrode, a drain electrode and a source electrode; the grid electrode of the FET is connected with the scanning electrode; the drain electrode of the FET is connected with the data electrode; and the capacitor and the LED lamp are connected in parallel and then are connected to the source electrode of the FET. Compared with the prior art, in the direct type LED backlight source device of the utility model, the FET is directly arranged on a backboard by a process and is then connected with the LED lamp, so that the LED lamp can be controlled without an independent drive device, the defect in the prior art that the backlight is more detailed by dividing and the price of a display device is higher due to more drive devices can be overcome, the LED can be independently controlled at lower cost and the backlight control on the whole liquid crystal display device can be improved.

Description

A kind of direct LED backlight device

Technical field

The utility model relates to the demonstration field, relates in particular to a kind of direct LED backlight device.

Background technology

Present stage, liquid crystal indicator has been widely used in the individual consumer's goods such as notebook computer, computer monitor, TV because in light weight, advantages such as volume is little, little power consumption, radiation is low, quality is good are arranged.Because LCD panel itself does not have the characteristics of luminescence, therefore must on the LCD panel, add a light emitting source, can reach display effect, backlight source module promptly provides the optical module of LCD display back light.

The LCD backlight source module can use light emitting diode (LED), cold-cathode fluorescence lamp (CCFL), external electrode fluorescent lamp (EFFL) etc. as light source.

The backlight of giant-screen LCD main flow remains CCFL on the market, but along with development of semiconductor, the particularly appearance of high-power LED chip, LED brightness and efficient have had significant raising, make the LED-backlit source more and more be applied to LCD backlight in.Utilizing led light source is that panel backlight has a lot of advantages as LCD panel backlight than with common CCFL.Wherein the most tangible improvement is the expansion of colour gamut.Use LED-backlit to have broader colour gamut, realize more gorgeous color.But also can realize dynamically controlling the RGB mixed light, and between 9600K and 6500K, adjust white balance, and can sacrificing luminance and contrast.

Present general direct-light-type backlight is to do that brightness processed is carried out in as a whole unification or with a plurality of zones of one-tenth backlight, in this zone a plurality of LED are carried out connection in series-parallel and control backlight basically.By top mode, can only carry out general processing to LED backlight, can not handle according to each LED, and many more its costs of subregion are high more.

The utility model content

The purpose of this utility model provides a kind of direct LED backlight device, has overcome above-mentioned shortcoming of the prior art.

To achieve these goals, the utility model adopts following technical scheme: a kind of direct LED backlight device, comprise scan electrode, data electrode, FET, capacitor and LED lamp, described FET comprises grid, drain electrode and source electrode, the grid of FET connects described scan electrode, the drain electrode of described FET is connected in described data electrode, is connected in the source electrode of FET after described capacitor and the parallel connection of LED lamp.

Described scan electrode is perpendicular to described data electrode.

Compared with prior art, the utility model direct LED backlight device, utilize technology directly FET to be fabricated on the backboard, and then connection LED lamp, so no longer need independent driving element to control the LED lamp, it is thin more to have overcome in the prior art division backlight, the more expensive more shortcomings of price that cause display device of driving element more, can improve the backlight control of entire liquid crystal display device with the independent control of lower cost realization to LED.

Description of drawings

Fig. 1 is a kind of direct LED backlight schematic representation of apparatus of the utility model.

Wherein: 1 is FET; 2 is the LED lamp; 3 is capacitor.

The specific embodiment

Below in conjunction with accompanying drawing the utility model is done and to be described in further detail.

A kind of direct LED backlight device of the utility model, its drive circuit is divided into data electrode and scan electrode, on the crosspoint of two electrodes, connect the circuit of forming by FET1, capacitor 3 and LED lamp 2, FET1 comprises grid, drain electrode and source electrode, the grid of FET1 connects scan electrode, the drain electrode of FET1 is connected in data electrode, is connected in the source electrode of FET1 after

capacitor

3 and 2 parallel connections of LED lamp.

The working method of scan electrode is that scan electrode is from Y1, according to Y1, Y2, Y3 ... Ym scans downwards, at one time, has only one road scan electrode to connect.The working method of data electrode is all data electrode A1, A2, A3 ... An, the data of corresponding scan electrode, output simultaneously.

In circuit working, at first be the scan electrode gating first row Y1, whether data electrode decides LED lamp 2 should light according to the viewing area data of the LCD panel of LED lamp 2 correspondences simultaneously, if light then the data electrode correspondence position is output as 1, otherwise be output as 0.Then the LED lamp 2 of position of the first row gating can be lighted, and electric capacity in parallel with LED lamp 2 simultaneously charges.

Scan electrode begins the gating second row Y2 then, and data electrode repeats to export the data of second row equally, and the LED lamp 2 of the second row relevant position is lighted, and the electric capacity 3 in parallel with it charges.Meanwhile, the LED lamp of lighting in first row 2 keeps illuminating state by its shnt capacitor discharge.

Other each row, the same.After finishing all each scanning of going, repeat the scanning downwards of first row again.Wherein the appearance value of the capacitor 2 in parallel with LED lamp 2 depends on the nominal operation current value of LED lamp 2 and the interval of sweep time.

Skilled artisan is appreciated that the only just explanation of number of the numerical value implemented in the illustration and scan electrode, data electrode in the industry, and all these embodiment within the spirit and scope of the present invention.

Claims

1. direct LED backlight device, comprise scan electrode, data electrode, FET, capacitor and LED lamp, described FET comprises grid, drain electrode and source electrode, it is characterized in that: the grid of FET connects described scan electrode, the drain electrode of described FET is connected in described data electrode, is connected in the source electrode of FET after described capacitor and the parallel connection of LED lamp.

2. direct LED backlight device according to claim 1, it is characterized in that: described scan electrode is perpendicular to described data electrode.