CN201288956Y - LED back light module unit - Google Patents

Abstract

The utility model discloses a LED backlight module set, comprising a back plate; a light guiding plate on the back plate; a plurality of LED devices, comprising a plurality of white-light LEDs and a plurality of red-white LEDs, wherein the white-light LEDs and the adjacent LEDs are arranged on the two sides of the light guiding plate. The LED backlight module set effectively solves the drawback that the mixture of the white-light and red-light in the rim angle area is not adequate.

Description

The LED-backlit module

Technical field

The utility model relates to a kind of module backlight, particularly relates to a kind of LED (Light Emitting Diode, light emitting diode) module backlight.

Background technology

Liquid crystal display has become the main flow display device, and the LCD TV development is advanced by leaps and bounds, and LCD also has large development.Because liquid crystal panel itself is not luminous, needs backlight to provide light source can reach display effect.The mainstream bulk backlight is the CCFL backlight at present, but the mechanical strength deficiency of the ultra-fine fluorescent tube of CCFL, problem is very outstanding in the large screen television complete machine, and three primary colors fluorescent powder cooperates color film color representation ability not good enough, contains mercuryvapour in addition in the CCFL fluorescent tube and does not also meet environmental protection requirement.

Compare with the CCFL backlight, the LED-backlit source has lot of advantages, does not contain Toxic matter mercury, has that splendid colour gamut shows, good mechanical shock stability is arranged, the life-span longer than CCFL arranged, control circuit is simple, driving voltage is low, switch time of nanosecond etc.Feasible backlight is dynamically controlled of the instant shut-in characteristic of LED device becomes possibility, and the characteristics of LED device spot light also make regional luminance control become possibility.The backlight area dynamic control technology adopts the luminous intensity of dynamic image capture technique according to the dynamic control area of picture intensity profile led light source, and the picture signal that changes the corresponding liquid crystal panel in front cooperates with it, the formation high resolution image shows, its dynamic contrast can be up to several ten thousand to one, satisfy HDR (High Dynamic Range, HDR) demand of image demonstration.Replaced C CFL backlight becomes main flow because the above-mentioned superiority of LED, development in future trend are the LED-backlit source.

The LED device produces white light dual mode: the light that (1) RGB primitive colours LED device sends mixes the generation white light by certain ratio; (2) the blue-ray LED device adds fluorescent material, and two wavelength white light LEDs generating white light mechanism are that a part of blue light is transformed into gold-tinted by fluorescent material, by mixing up blue light and gold-tinted has obtained white light.Comparatively speaking, two wavelength white light LEDs will be got well much than RGB primitive colours LED luminous efficiency, and price is much lower, has been widely used in now in the small size LCD backlight source, also probably becomes following large-scale LCD backlight industrialization first-selection.But the red composition of two wavelength white light LEDs is on the weak side, and color reprodubility is good inadequately.

The scheme of a kind of red composition of solution two wavelength white light LEDs shortcoming on the weak side is the three-wavelength white light LEDs, and promptly the blue-ray LED device adds red, green fluorescence powder.Three-wavelength white light LEDs generating white light mechanism be a part of blue light by the green fluorescence powder be transformed into green glow, a part of blue light is transformed into ruddiness by red fluorescent material, obtains white light by mixing up blue light, green glow, ruddiness.But the shortcoming of three-wavelength white light LEDs be luminous efficiency far below two wavelength white light LEDs, the stability of its red composition is also good inadequately.Another scheme that solves the red composition of two wavelength white light LEDs shortcoming on the weak side is being used in combination of two wavelength white light LEDs and red-light LED, U.S. Pat 2005/0286264A1 discloses two wavelength white light LEDs and red-light LED cross arrangement has been used jointly, see also Fig. 1, red light-emitting diode 344R, the mutual cross arrangement of white light emitting diode 344W is at LED lamp bar printed circuit board (PCB) 345, but for the side-emitting LED backlight, there are deficiency in the two wavelength white light LEDs in the such scheme and the mode of red-light LED cross arrangement, at corner areas 347 place's white lights, ruddiness undercompounding.See continuation referring to Fig. 2, mainly worked by white light LEDs in 347 places in corner areas, and the light that sends through LGP 346 mainly is white light, and white light, ruddiness undercompounding are excessive with the central point aberration.

The utility model content

Technical problem to be solved in the utility model provides a kind of LED-backlit module, effectively avoids the shortcoming of corner areas place white light, ruddiness undercompounding.

The utility model is to solve the problems of the technologies described above the technical scheme that adopts to provide a kind of LED-backlit module, comprises a backboard; One LGP places on the described backboard; Several LED devices, described LED device comprise several white light LEDs and several red-light LEDs, the adjacent both sides that are arranged in described LGP of described white light LEDs and red-light LED.

The utility model contrast prior art has following beneficial effect: the utility model is by with the adjacent both sides that are arranged in described LGP with red-light LED of white light LEDs, effectively avoid the shortcoming of corner areas place white light, ruddiness undercompounding, produce high colour gamut white light.

Description of drawings

Fig. 1 is the schematic diagram that is used in combination of existing white light LEDs and red-light LED.

Fig. 2 is that existing white light LEDs and red-light LED are at corner areas place undercompounding schematic diagram.

Fig. 3 is the schematic diagram that is used in combination of the utility model white light LEDs and red-light LED.

Fig. 4 be the utility model white light LEDs with red-light LED at corner areas place mixing schematic diagram.

Fig. 5 is the structural representation that the utility model LED-backlit module is used for liquid crystal indicator.

Among the figure:

11 liquid crystal panels, 12 diffusion sheets, 13 prismatic lenses

14 prismatic lenses, 15 diffusion sheets, 16 LGPs

17 white light emitting diodes, 18 red light-emitting diodes

19 backboards, 20 printed circuit board (PCB)s

344R red light-emitting diode 344w white light emitting diode

345 printed circuit board (PCB)s, 346 LGPs, 347 corner areas

The specific embodiment

The utility model will be further described below in conjunction with drawings and Examples.

Fig. 3 is the schematic diagram that is used in combination of the utility model white light LEDs and red-light LED, Fig. 4 be the utility model white light LEDs with red-light LED at corner areas place mixing schematic diagram.

See also Fig. 3, the utility model LED device pcb board comprises LGP 16, be distributed in described LGP 16 printed circuit board (PCB) 20 all around, be distributed with several white light emitting diodes 17 or several red light-emitting diodes 18 on the described printed circuit board (PCB) 20, described white light emitting diode 17 and the red light-emitting diode 18 adjacent both sides that are arranged in described LGP 16.Please continue referring to Fig. 4, because the light emitting diode of same color is distributed in homonymy, at corner areas 347 places, white light emitting diode 17 and red light-emitting diode 18 still can fully mix

Fig. 5 is the structural representation that the utility model LED-backlit module is used for liquid crystal indicator.

See also Fig. 4, provide the exploded perspective schematic diagram of a liquid crystal indicator among the figure, comprise liquid crystal panel 11 from top to bottom successively, diffusion sheet 12, prismatic lens 13, prismatic lens 14, diffusion sheet 15 and LED-backlit module of the present utility model.LED-backlit module of the present utility model comprises several white light emitting diodes 17, several red light-emitting diodes 18, LGP 16 and backboard 19.Described white light emitting diode 17 and the red light-emitting diode 18 adjacent both sides that are arranged in described LGP 16.The light that the LED spot light sends, enter LGP 16,, become area source and above LGP 16, penetrate through a series of emissions, scattering and refraction, through the optically focused effect of prismatic lens 14,13 and the diffusion of diffusion sheet 15,12, for liquid crystal panel 11 provides light source.

The utility model by with white light emitting diode 17 and the red light-emitting diode 18 adjacent both sides that are arranged in described LGP 16, is effectively avoided the shortcoming of corner areas 347 place's white lights, ruddiness undercompounding by the utility model, produces high colour gamut white light.

Though the utility model discloses as above with preferred embodiment; right its is not in order to limit the utility model; any those skilled in the art; in not breaking away from spirit and scope of the present utility model; when doing a little modification and perfect, therefore protection domain of the present utility model is worked as with being as the criterion that claims were defined.

Claims (1)

1, a kind of LED-backlit module comprises:

One backboard;

One LGP places on the described backboard;

Several LED devices comprise several white light LEDs and several red-light LEDs;

It is characterized in that the adjacent both sides that are arranged in described LGP of described white light LEDs and red-light LED.

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