CN202217487U

CN202217487U - Bottom lighting light-emitting diode (LED) back light control system

Info

Publication number: CN202217487U
Application number: CN2011203156691U
Authority: CN
Inventors: 蒋吉强; 李治强; 彭南山; 唐德良; 李晓丽
Original assignee: Guangdong Changhong Electronics Co Ltd
Current assignee: Guangdong Changhong Electronics Co Ltd
Priority date: 2011-08-26
Filing date: 2011-08-26
Publication date: 2012-05-09
Anticipated expiration: 2021-08-26

Abstract

The utility model discloses a bottom lighting light-emitting diode (LED) back light control system, which comprises a main control integrated circuit (IC), a T-CON time sequence control circuit and a bottom lighting LED back light which is composed of a plurality of LED back light blocks, and the main control IC is connected with the bottom lighting LED back light through the T-CON time sequence control circuit. The bottom lighting LED back light control system further comprises a photo induction module, an LED back light control unit and an LED back light driving unit. The photo induction module and the main control IC is connected with the LED back light control unit which is connected with the bottom lighting LED back light through the LED back light driving unit. The bottom lighting LED back light control system is capable of reducing the brightness of the bottom lighting LED back light, reduces energy consumption while reproducing high contrast and color protection degree, and ensures optimum viewing effect in different environment brightness.

Description

A kind of direct LED backlight control system

Technical field

The utility model relates to TFT-LCD backlight of LCD technical field, particularly relates to a kind of direct LED backlight control system.

Background technology

TFT-LCD is because can not autoluminescence; Need realize Presentation Function by backlight; In traditional technology, the demonstration backlight of TFT-LCD often realizes through the CCFL fluorescent light, and along with continuous advancement in technology; More high-quality, theoretical life-span are longer by light source gradually for inefficient CCFL fluorescent light, and the LED of more energy-conserving and environment-protective replaces.Because LED has photoelectricity conversion rate fast; In the industry local dimming (Local Dimming) technology that adopt more; To put in order screen image and be divided into several regions, and, can effectively improve display image contrast and color saturation like this according to the dynamically adjustment region LED-backlit brightness of content of display image in each zone; With when further reducing LCD TV energy consumption, catered to demand to the more sensitive customers of image quality.Yet, because LCD TV time span and the environmental difference watched are bigger, for example by day under the brighter environment of light; Require liquid crystal display brightness higher, otherwise picture brightness is not enough, watches difficulty; And under the very low situation of ambient brightness at night; Brightness needs lower, otherwise showing that bright field picture hypograph is dazzling, causes beholder's visual fatigue easily.Along with the theory of low-carbon environment-friendly rises up into the popular feeling, improve simultaneously and watch tv effect night in order further to reduce energy resource consumption, seek a kind of backlight brightness control system of regulating display screen according to ambient brightness and seem particularly necessary.

The utility model content

The utility model purpose is to provide a kind of back-light source control system that can utilize environment light sensation module to regulate automatically backlight illumination.

The utility model solves the technical scheme that its technical matters adopted:

A kind of direct-light type LED backlight control system; Comprise master control IC, T-CON sequential control circuit, TFT-LCD and direct LED backlight; Direct LED backlight is made up of a plurality of LED-backlit blocks; Master control IC connects TFT-LCD through the T-CON sequential control circuit; Comprise photoinduction module, LED-backlit control module and LED-backlit driver element in addition, photoinduction module and master control IC connect the LED-backlit control module, and the LED-backlit control module connects direct LED backlight through the LED-backlit driver element.

The beneficial effect of the utility model: the utility model has increased the photoinduction module on the basis of traditional direct-light type LED backlight control system; Dynamically to control the variation of backlight illumination according to ambient brightness; When environment temperature is brighter, to improve the brightness of direct LED backlight; When environment temperature is dark, reduce the brightness of direct LED backlight, so in existing high-contrast and color protection degree, further cut down the consumption of energy again, and guaranteed the best viewing effect under varying environment brightness.

Description of drawings

In order to be illustrated more clearly in the technical scheme among the utility model embodiment, the accompanying drawing of required use is done simple declaration in will describing embodiment below.Obviously, described accompanying drawing is a part of embodiment of the utility model, rather than whole embodiment, those skilled in the art under the prerequisite of not paying creative work, other design proposals and the accompanying drawing that can also obtain according to these accompanying drawings:

Fig. 1 is the functional-block diagram of the utility model.

Embodiment

Below will combine embodiment and accompanying drawing that the technique effect of design, concrete structure and the generation of the utility model is carried out clear, intactly description, with purpose, characteristic and the effect of understanding the utility model fully.Obviously; Described embodiment is a part of embodiment of the utility model, rather than whole embodiment, based on the embodiment of the utility model; Other embodiment that those skilled in the art is obtained under the prerequisite of not paying creative work all belong to the scope that the utility model is protected.

With reference to Fig. 1; The direct-light type LED backlight control system that the utility model provided; Comprise master control IC4, T-CON sequential control circuit and TFT-LCD 6 thereof, direct LED backlight 5, photoinduction module 1, LED-backlit control module 2 and LED-backlit driver element 3; Wherein direct LED backlight 5 is made up of a plurality of LED-backlit blocks; Master control IC4 connects T-CON sequential control circuit 2 through the LVDS data-interface; To come dynamically adjustment LED-backlit brightness according to direct LED backlight 5 zones of different displaying contents, master control IC4 connects LED-backlit control module 3 through the SPI interface, makes the luminance signal of LED-backlit source 5 each block give LED-backlit control module 3 with the SPI delivered; The outside brightness variation that photoinduction module 1 will be sensed becomes dc level signal through opto-electronic conversion; Its DC level is along with ambient brightness increases and linear increasing; Therefore this dc level signal passes to continuous LED-backlit control module 3; Then 3 pairs of level signals of LED-backlit control module are handled, and influence the whole output gain of electric current of LED-backlit driver element 2 along with the variation of dc level signal, thereby control the overall brightness of LED-backlit control module 2 according to ambient brightness.

In actual the use, when ambient brightness brighter, as under the daytime situation; After photoinduction module 1 sensed luminance; Influence the output gain of LED-backlit driver element 2 through LED-backlit control module 3, and then promote the overall brightness in LED-backlit source 5, so that overall brightness is brighter; With complementary mutually, make the beholder clearly to watch with brighter ambient light; Otherwise, when ambient brightness is darker,,, make the overall brightness in LED-backlit source 5 reduce through the detection signal of photoinduction module 1 as when the night, to cooperate, make picture soft with darker environmental facies.It is thus clear that the utility model is compared traditional direct-light type LED backlight control system, the photoinduction module that increases in addition can further cut down the consumption of energy again in realization high-contrast and color protection degree, and guarantee the best viewing effect under varying environment brightness.

Certainly; The invention is not limited to above-mentioned embodiment; Those of ordinary skill in the art also can make equivalent variations or replacement under the prerequisite of the utility model spirit, modification that these are equal to or replacement all are included in the application's claim institute restricted portion.

Claims

1. direct-light type LED backlight control system; Comprise master control IC (4), T-CON sequential control circuit, TFT-LCD (6) and direct LED backlight (5); Direct LED backlight (5) is made up of a plurality of LED-backlit blocks; Master control IC (4) connects TFT-LCD (6) through the T-CON sequential control circuit; It is characterized in that: also comprise photoinduction module (1), LED-backlit control module (3) and LED-backlit driver element (2); Said photoinduction module (1) and master control IC (4) connect said LED-backlit control module (3), and said LED-backlit control module (3) connects said direct LED backlight (5) through said LED-backlit driver element (2).