CN100458528C - Backlight module - Google Patents

Abstract

The invention relates to a backlight module, which comprises a light guide plate, at least one first light-emitting element and at least one second light-emitting element. The light guide plate has a first side surface and a second side surface opposite to the first side surface. The first light-emitting element is arranged on the first side face and provided with at least three light-emitting diodes with different colors. The second light-emitting element is arranged on the second side surface and provided with at least three light-emitting diodes with different colors. The light emitting diodes of the second light emitting element and the light emitting diodes of the first light emitting element have different arrangement modes.

Description

Backlight module

technical field

The present invention relates to a display device, and in particular to a backlight module used in the display device.

Background technique

Compared with the cold cathode tube (Cold Cathode Fluorescent Lamp; CCFL) traditionally used as a backlight, the light-emitting diode (Light-Emitting Diode; LED) has the advantages of low power consumption, high color rendering and no mercury, making LED gradually Replacing CCFL as the backlight source of a new generation of liquid crystal displays.

Most of the LED white light backlights used in liquid crystal displays are formed by mixing multiple colors of light. More specifically, the common LED white light backlight is formed by arranging multiple LEDs emitting different colors; however, due to the asymmetric distribution of light shapes of different colors, the uniformity of color mixing is often poor, which leads to The emitted white light has the problem of color cast.

Contents of the invention

The invention provides a backlight module, which achieves the effect of uniform color mixing by adjusting the arrangement of light emitting diodes.

The object of the present invention is achieved in this way, a backlight module includes a light guide plate, at least one first light-emitting element and at least one second light-emitting element. The light guide plate has a first side and a second side opposite to the first side. The first light emitting element is arranged on the first side, and the first light emitting element has at least three light emitting diodes of different colors. The second light emitting element is arranged on the second side, and the second light emitting element has at least three light emitting diodes of different colors. Wherein, the above-mentioned light emitting diodes of the second light emitting element and the light emitting diodes of the first light emitting element have different arrangements.

To sum up, the present invention arranges the LEDs on both sides of the light guide plate in different ways. In this way, even if the light shapes of individual LEDs are asymmetrical, because the LEDs on both sides of the light guide plate are arranged differently, the side with weaker energy can be compensated after color mixing, thereby avoiding the problem of color shift in the emitted white light.

Description of drawings

FIG. 1 : shows a three-dimensional schematic diagram of a backlight module according to an embodiment of the present invention.

Fig. 2: A side-by-side schematic view of the first light-emitting element and the second light-emitting element viewed from the arrow directions A and A' of Fig. 1 .

Fig. 3 is a side-by-side schematic view of the first light-emitting element and the second light-emitting element viewed from the arrow directions A and A' of Fig. 1 according to another embodiment of the present invention.

Fig. 4: A side-by-side schematic view of the first light-emitting element and the second light-emitting element viewed from the arrow directions A and A' of Fig. 1 according to yet another embodiment of the present invention.

Fig. 5: A side-by-side schematic view of the first light-emitting element and the second light-emitting element viewed from the arrow directions A and A' of Fig. 1 according to other embodiments of the present invention.

Figure number:

110: light guide plate 112: first side

114: Second side 120: First light-emitting element

122a: light emitting diode 122b: light emitting diode

122c: light emitting diode 130: second light emitting element

132a: light emitting diode 132b: light emitting diode

132c: LED A: Direction

A': Direction

Detailed ways

Referring to FIG. 1 , it shows a perspective view of a backlight module according to an embodiment of the present invention. As shown in the figure, a backlight module includes a light guide plate 110 , at least one first light emitting element 120 and at least one second light emitting element 130 . The light guide plate 110 has a first side 112 and a second side 114 opposite to the first side 112 . The first light emitting element 120 is disposed on the first side 112 , and the second light emitting element 130 is disposed on the second side 114 . More specifically, the above-mentioned first light-emitting elements 120 and second light-emitting elements 130 may firstly be composed of a plurality of first light-emitting elements 120 and a plurality of second light-emitting elements 130 respectively to form a lighting bar (Lighting Bar), and then place the light bar on Two sides of the light guide plate 110 . It should be understood that the solid line in Fig. 1 represents the directly visible line segment, while the dashed line represents the invisible line segment hidden behind the entity.

FIG. 2 is a side-by-side schematic diagram of the first light-emitting element 120 and the second light-emitting element 130 viewed from the arrow directions A and A' of FIG. 1 . As shown in the figure, the above-mentioned first light-emitting element 120 has at least three light-emitting diodes 122a, 122b, and 122c of different colors. The colors of the light-emitting diodes are not limited in the present invention. The light-emitting diodes in this embodiment include, for example Light-emitting diodes of three different colors, red, green, and blue. The second light-emitting element 130 has at least three light-emitting diodes 132a, 132b, and 132c of different colors, and the colors of the light-emitting diodes are not limited here. Color LEDs. Wherein, the light emitting diodes 122 a , 122 b , 122 c of the first light emitting element 120 and the light emitting diodes 132 a , 132 b , 132 c of the second light emitting element 130 have different arrangements.

More specifically, the above-mentioned color arrangement of the LEDs 132a, 132b, and 132c of the second light-emitting element 130 is a horizontal inversion of the color arrangement of the LEDs 122a, 122b, and 122c of the first light-emitting element 120, so the second The color arrangement of the light emitting diodes 132a, 132b, 132c of the second light emitting element 130 and the light emitting diodes 122a, 122b, 122c of the first light emitting element 120 is correspondingly arranged left and right. In this way, even if the light shapes of individual LEDs are asymmetrical, the color arrangement of the LEDs 122a, 122b, and 122c of the first light emitting element 120 and the LEDs 132a, 132b, and 132c of the second light emitting element 130 correspond to left and right. Therefore, after color mixing, the side with weaker energy of each other can be compensated, thereby reducing the color difference value of the emitted white light.

Referring to FIG. 3 , it shows a side-by-side schematic view of the first light-emitting element 120 and the second light-emitting element 130 viewed from the arrow directions A and A' of FIG. 1 according to another embodiment of the present invention. In this embodiment, the color arrangement of the light-emitting diodes 132a, 132b, and 132c of the second light-emitting element 130 is vertically reversed from the color arrangement of the light-emitting diodes 122a, 122b, and 122c of the first light-emitting element 120, so the second light-emitting The color arrangement of the light emitting diodes 132a, 132b, 132c of the element 130 and the light emitting diodes 122a, 122b, 122c of the first light emitting element 120 is arranged correspondingly up and down.

Referring to FIG. 4 , it shows a side-by-side schematic diagram of the first light-emitting element 120 and the second light-emitting element 130 viewed from the arrow directions A and A' in FIG. 1 according to yet another embodiment of the present invention. In this embodiment, the color arrangement of the light-emitting diodes 132a, 132b, and 132c of the second light-emitting element 130 is the same as the color arrangement of the light-emitting diodes 122a, 122b, and 122c of the first light-emitting element 120. Therefore, the color arrangement of the light emitting diodes 132a, 132b, 132c of the second light emitting element 130 and the light emitting diodes 122a, 122b, 122c of the first light emitting element 120 is correspondingly set up, down, left, and right.

Although in the previous embodiments, the light emitting diodes 122a, 122b, 122c of the first light emitting element 120 and the light emitting diodes 132a, 132b, 132c of the second light emitting element 130 are arranged in a triangle, this does not limit the present invention, the first The light emitting diodes 122a, 122b, 122c of the light emitting element 120 and the light emitting diodes 132a, 132b, 132c of the second light emitting element 130 can also be arranged in other shapes. For example, the light emitting diodes 122a, 122b, 122c of the first light emitting element 120 in FIG. 5 and the light emitting diodes 132a, 132b, 132c of the second light emitting element 130 are linearly arranged at an oblique angle.

Table 1 below lists the color difference values of several experimental samples to illustrate the relationship between the generation of color shift and the arrangement of light emitting diodes. Among them, the light-emitting diodes of the light-emitting elements on both sides of the light guide plate of the experimental sample 1 are arranged in a triangle, and the arrangement of the light-emitting elements on both sides is the same; the light-emitting diodes of the light-emitting elements on both sides of the light guide plate of the experimental sample 2 are all arranged linearly, and The arrangement of light-emitting elements on both sides is the same; the third experimental sample is the backlight module shown in FIG. 2 ; the fourth experimental sample is the backlight module shown in FIG. 5 .

Table 1

Experimental sample one two three Four Arrangement shape of light-emitting diodes Triangular arrangement Linear arrangement Triangular arrangement Linear arrangement Arrangement of light emitting elements same same different different Color difference value ～0.010 ～0.017 ～0.006 ～0.008

As can be seen from Table 1, compared with experimental sample 1 and experimental sample 2, experimental sample 3 and experimental sample 4 of the above-mentioned embodiment of the present invention can reduce the color difference by about 0.004 and 0.009 respectively according to the arrangement of the light-emitting diodes. .

Although the present invention has been disclosed with specific embodiments, it is not intended to limit the present invention. Any person skilled in the art can make replacements of equivalent components without departing from the concept and scope of the present invention, or replace them according to the present invention. The equivalent changes and modifications made in the scope of patent protection shall still fall within the scope of this patent.

Claims (3)

1. module backlight is characterized in that this module backlight comprises at least:

One light guide plate has one first side and one second side, and wherein this first side is relative with this second side;

At least one first light-emitting component is arranged at this first side, and this first light-emitting component has the light emitting diode of at least three different colours;

At least one second light-emitting component, be arranged at this second side, and this second light-emitting component has the light emitting diode of at least three different colours, and wherein those light emitting diodes of this second light-emitting component have different arrangement modes with those light emitting diodes of this first light-emitting component;

The color arrangement mode of those light emitting diodes of this second light-emitting component is flip horizontal, flip vertical or the level and the flip vertical setting simultaneously of color arrangement mode of those light emitting diodes of this first light-emitting component.

2. module backlight as claimed in claim 1 is characterized in that: those light emitting diodes of this first light-emitting component and those light emitting diodes of this second light-emitting component are to be oblique angle linear array or rounded projections arranged.

3. module backlight as claimed in claim 1 is characterized in that: the color of those light emitting diodes of this first light-emitting component and those light emitting diodes of this second light-emitting component comprises redness, green and blue.

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