CN2627536Y - Light source assembly structure of backlight assembly - Google Patents

Abstract

The utility model provides a backlight component structure, which is applied to a liquid crystal display. The backlight assembly structure includes a light guide plate with an incident end surface; a first light source located at the incident end surface of the light guide plate as a main light source of the backlight assembly structure; and a second light source located at the light guide plate Both sides of the incident end surface are used as an auxiliary light source so that the backlight assembly has no dark corners.

Description

Light source assembly structure of backlight assembly

(1) Technical field

The utility model relates to a light source assembly structure of a backlight assembly, in particular to a light source assembly structure capable of solving the dark angle problem of the backlight assembly.

(2) Background technology

The Back Light Module is a key component of the LCD Panel. Since the liquid crystal itself does not emit light, the function of the Back Light Module is to supply a light source with sufficient brightness and uniform distribution, so that the panel can display images normally. Generally speaking, backlight components can be divided into two types: "direct-lit" and "edge-lit". The direct type design is to place the lamp tube directly under the module, and because the installation space becomes larger, more than two lamp tubes can be used to increase the intensity of the light source, but it also increases the thickness and weight of the module. At the same time, multiple lamps also increase power consumption, so it is more suitable for LCD monitors or LCD TVs that are less picky about portability and space requirements. The backlight assembly 1 adopting side-light design, as shown in Fig. sheet 14 , diffusion sheet 15 , prism sheet 16 , and frame 17 . Usually only a single cold-cathode lamp 12 is used as the light source, and the design of the wedge-shaped light guide plate 11 is used to strengthen the control of the light traveling direction, which is relatively difficult. And this design is to consider the needs of users such as "lightness", "thinness" and "power saving", so it is mainly used for LCD panels for notebook computers at this stage.

Generally, when using a laptop computer, users will often notice that the corners of the screen are darker. This is because the "cold cathode lamp" used in the edge-lit backlight component emits light in the high and low voltage areas at both ends. Insufficient intensity makes the corners of the backlight assembly too dark, thereby affecting the display effect of the LCD display. As shown in FIG. 1( b ), the backlight assembly 1 has two vignetting corners 18 . In order to solve this problem, it is conventionally known to extend the length of the cold-cathode lamp 12 or extend the distance of the cold-cathode lamp 12 to increase its illumination range, but both of them have limited improvement effects. Moreover, increasing the cold cathode lamp tube 12 or pulling the cold cathode lamp tube 12 away will increase the area of the LCD panel frame. Therefore, under the situation that most notebook computers are light, thin, and small and exquisite nowadays, this is really unfavorable to the industry.

(3) Contents of utility model

The main purpose of the utility model is to provide a light source assembly structure of a backlight assembly to improve the problem of too dark corners of a liquid crystal display.

Another object of this utility model is to provide a light source assembly structure of a backlight assembly, which is to add a light emitting diode (LED) in the high and low voltage area on both sides of the original cold cathode lamp as an auxiliary light source to enhance the corner illumination. , thereby improving the problem of vignetting.

The backlight assembly structure according to one aspect of the present invention is applied to a liquid crystal display, including: a light guide plate with an incident end surface; a first light source located at the incident end surface of the light guide plate as the main structure of the backlight assembly a light source; and a second light source, which are located on both sides of the incident end surface of the light guide plate, as an auxiliary light source so that the backlight assembly has no dark corners.

According to the above idea, the backlight assembly can be an edge-lit backlight assembly, and the first light source can be a cold cathode lamp (CCFL), the second light source can be at least two light-emitting diodes (LEDs), and the light guide plate is a wedge-shaped light guide plate.

In addition, the second light source has a relative oblique angle and is symmetrically arranged on both sides of the incident end surface.

In addition, the light guide plate also includes a bottom surface and an outgoing surface.

As mentioned above, the bottom surface of the light guide plate has a plurality of patterns for interfering with the light incident on the light guide plate from the first and second light emitting sources.

At the same time, the structure of the backlight assembly also includes: a light guide cover, used to cover the first light source, and reflect the light emitted by the first light source into the light guide plate; a reflector, located under the bottom surface of the light guide plate, to reflect the light leaked from the bottom surface back to the light guide plate; a diffusion sheet is located on the exit surface of the light guide plate to make the distribution of light emitted by the light guide plate more uniform; and a prism sheet is located on the diffusion sheet to correct the light direction to achieve the effect of concentrating light.

According to another aspect of the utility model, a light source assembly structure is applied to a backlight assembly, including: a first light source, used as the main light source of the backlight assembly; and a second light source, located at the first The left and right sides of the luminous light source are used as auxiliary light sources of the backlight assembly, and the combination of the first and second luminous light sources makes the backlight assembly have no dark corners.

According to the above idea, the backlight assembly can be an edge-lit backlight assembly, the first light source can be a cold cathode lamp (CCFL), and the second light source can be at least two light emitting diodes (LEDs).

In addition, the backlight assembly includes a light guide plate, which has an outgoing surface, a bottom surface, and an incident end surface, wherein the light guide plate is a wedge-shaped light guide plate.

In addition, the first light source is located on the incident end surface of the light guide plate to provide an incident light to enter the light guide plate, and the second light source has a relative oblique angle and is symmetrically arranged on both sides of the incident end surface to provide an auxiliary incident light entering light guide plate.

At the same time, the bottom surface of the light guide plate has a plurality of patterns to interfere with the light incident on the light guide plate by the first light source and the second light source.

As mentioned above, the backlight assembly also includes: a light guide cover to cover the first light source to reflect the light emitted by the first light source into the light guide plate, a reflective sheet located under the bottom surface of the light guide plate, To reflect the light leaked from the bottom surface back to the light guide plate, a diffusion sheet, located on the exit surface of the light guide plate, to make the distribution of light emitted by the light guide plate more uniform, and a prism sheet, located on the diffusion sheet, to correct the light direction to achieve the effect of concentrating light.

(4) Description of drawings

The utility model can be gained a deeper understanding by the following drawings and detailed description.

Figure 1(a) is a top view of a conventional backlight assembly;

Fig. 1 (b) is a structural side view of a known backlight assembly;

2 is a top view of a preferred embodiment of the light source assembly structure of the backlight assembly conceived according to the present invention;

3 is a structural perspective view of a preferred embodiment of the light source assembly structure of the backlight assembly conceived according to the present invention;

FIG. 4 is a structural schematic diagram of another preferred embodiment of the structure of the light source assembly of the backlight assembly conceived according to the present invention;

FIG. 5 is a structural schematic diagram of another preferred embodiment of the structure of the light source assembly of the backlight assembly conceived according to the present invention; and

FIG. 6 is a structural schematic diagram of yet another preferred embodiment of the structure of the light source assembly of the backlight assembly conceived according to the present invention.

(5) Has a specific embodiment

The structure of the light source assembly of the backlight assembly of the present invention can be fully understood from the description of the following embodiments, so that those skilled in the art can complete it accordingly. However, the implementation of the present utility model cannot be limited by the following examples.

Please refer to FIG. 2 , which is a top view of a preferred embodiment of the light source assembly structure of the backlight assembly developed according to the concept of the present invention. Please also refer to FIG. 3 , which is a structural schematic diagram of a preferred embodiment of the structure of the light source assembly of the backlight assembly developed according to the concept of the present invention. As shown in FIGS. 2 and 3 , the backlight assembly 2 includes: a light guide plate 21 , a cold cathode lamp (CCFL) 22 , a light guide cover 23 , a reflector 24 , two light emitting diodes (LEDs) 25 , and a frame 27 . Wherein, the appearance of the light guide plate 21 is designed to be wedge-shaped, and has an incident end surface 211 and a bottom surface 212 , and a plurality of dots 26 are printed on the bottom surface 212 . The cold cathode lamp tube 22 is located at the incident end surface 211 of the light guide plate 21 . At the same time, the cold cathode lamp tube 22 is also covered by the light guide cover 23 .

The main light-emitting mechanism of the backlight assembly 2 is: the cold-cathode lamp tube 22 located at the incident end surface 211 acts as a light source, so that the light enters the light guide plate 21 . Next, since the light guide plate 21 is a wedge-shaped structure, the light entering the light guide plate 21 will be reflected upward due to encountering the bottom surface 212 of the light guide plate 21 . The light leaking out of the bottom surface 212 will be reflected back into the light guide plate 21 due to the arrangement of the reflective sheet 24 . As for the light guide cover 23 , it is used to reflect the light not directed towards the light guide plate 21 into the light guide plate 21 to enhance the light intensity. At the same time, the multiple dots 26 on the bottom surface 212 can help the light to diffuse and distribute evenly. Under this main light-emitting mechanism, the light emitted by the CCFL 22 is used as a main light source.

Next, in addition to the main light-emitting mechanism in the present invention, an auxiliary light-emitting mechanism is used to make up for the defect of the main light-emitting mechanism in the prior art (that is, the corner is too dark). The auxiliary light-emitting mechanism of the present invention is to add two light-emitting diodes (LEDs) 25 on both sides of the incident end surface of the light guide plate (that is, the high and low voltage areas) as auxiliary light sources. The auxiliary lighting mechanism is to illuminate the dark corners in the prior art through the arrangement of the light emitting diodes 25 to make up for the lack of light intensity at both ends of the high and low voltage areas of the cold cathode lamp tube 22 .

In the edge-lit backlight assembly, the vignetting is formed mainly because the two ends of the high and low voltage areas of the cold cathode lamp tube 22 have a certain light intensity limitation due to technical limitations. It cannot be compared with the brightness of the center of the lamp tube, and therefore cannot make the intensity of the light received by the entire light guide plate consistent, so that the corners of the liquid crystal display will be too dark. Therefore, it is indeed a practical method to install another auxiliary light source at the place where the light of the light guide plate is insufficient, without affecting other structures and without increasing the area of the liquid crystal display.

As shown in FIG. 3 , in the present invention, light emitting diodes 25 are arranged on both sides of the incident end surface 211 of the light guide plate 21 as auxiliary light sources. Moreover, the two light emitting diodes form a symmetrical oblique angle with each other. It can be seen from the figure that the light-emitting diodes 25 located at the corners of the light guide plate 21 can scatter light to provide light sources at the corners of the light guide plate 21 , making up for the shortcoming of insufficient brightness in the high and low voltage areas at both ends of the cold cathode lamp tube 22 . Moreover, since the light emitting diode 25 is directly arranged at the corner where the dark corner occurs, it can be ensured that the dark corner will receive light, so the situation in the prior art can be solved.

In addition, the location of the auxiliary light source of the present invention can be adjusted as required. Please refer to FIG. 4 , which is a schematic structural diagram of another preferred embodiment conceived according to the present invention. As shown in the figure, the position of the light emitting diode 25 only needs to be placed at the corner of the light guide plate 21 , not necessarily limited to the cut corner of the light guide plate 21 , so as to solve the problem of vignetting. At the same time, in this case, the length of the cold cathode lamp tube 25 can be shortened accordingly. Alternatively, the light emitting diodes can also be arranged in the manner shown in FIG. 5 , and the same effect can also be achieved.

The purpose of setting the auxiliary light source in the utility model is to adjust the light energy to the required area, so that the brightness of the whole liquid crystal display tends to be consistent. Therefore, if the position where the luminance of the liquid crystal display is insufficient is not located at the corner, the position of the auxiliary light source can also be adjusted according to the position of the area where the brightness needs to be increased, as shown in FIG. 6 , and it is not necessarily limited to the corner of the light guide plate 21. .

In summary, according to the light source assembly structure of the backlight assembly described in the present utility model, an auxiliary light source light-emitting diode (LED) is added outside the light-emitting light source cold cathode lamp tube (CCFL) of a general liquid crystal display, and then solves the problem of liquid crystal display. Common vignetting and insufficient brightness problems. Moreover, since the volume of the light-emitting diode is quite small, it does not affect the area of the entire liquid crystal display, that is, it does not need to increase the width of the liquid crystal display frame, and also avoids the conventional means for solving the problem of vignetting, such as: lengthening the cold Cathode lamp tubes, or lengthening the distance between the cold cathode lamp tubes and the light guide plate, will encounter the problem that the frame must be enlarged. In addition, due to the arrangement of light-emitting diodes, the length of the cold cathode lamp can even be shortened, thereby reducing the tube pressure.

Claims (19)

1. A backlight assembly structure applied to a liquid crystal display, characterized in that it comprises at least: A light guide plate having an incident end surface; a first light source, located on the incident end surface of the light guide plate, as the main light source; and A second light source is located on both sides of the incident end surface of the light guide plate as an auxiliary light source. 2. The backlight assembly structure according to claim 1, wherein the backlight assembly is a side-lit backlight assembly. 3. The backlight assembly structure as claimed in claim 1, wherein the first light source is a cold cathode lamp. 4. The backlight assembly structure as claimed in claim 1, wherein the second light source is a light emitting diode. 5. The backlight assembly structure according to claim 1, wherein the light guide plate is a wedge-shaped light guide plate. 6 . The backlight assembly structure according to claim 1 , wherein the second light source has a relative oblique angle and is symmetrically arranged on both sides of the incident end surface. 7. The backlight assembly structure according to claim 1, wherein the light guide plate further comprises a bottom surface and an emitting surface. 8 . The backlight assembly structure according to claim 7 , wherein the bottom surface of the light guide plate has a plurality of dots to interfere with the light incident on the light guide plate by the first light source and the second light source. 9. The backlight assembly structure according to claim 7, wherein the backlight assembly structure further comprises: a light guide cover for covering the first light emitting source and reflecting the light emitted by the first light emitting source into the light guide plate; a reflective sheet, located under the bottom surface of the light guide plate, to reflect light leaked from the bottom surface back to the light guide plate; a diffusion sheet, located above the exit surface of the light guide plate, so as to make the distribution of light emitted by the light guide plate more uniform; and A prism sheet is located on the diffusion sheet to correct the direction of light and achieve the effect of concentrating light. 10. A light source assembly structure applied to a backlight assembly, characterized in that it at least includes: a first luminescent light source used as the main light source; and A second light source is located on both sides of the first light source as an auxiliary light source. 11. The light source assembly structure according to claim 10, wherein the backlight assembly is a side-lit backlight assembly. 12. The light source assembly structure according to claim 10, wherein the first light source is a cold cathode lamp. 13. The light source assembly structure according to claim 10, wherein the second light source is a light emitting diode. 14. The structure of the light source unit according to claim 10, wherein the backlight unit comprises a light guide plate having an exit surface, a bottom surface and an incident end surface. 15. The light source assembly structure according to claim 14, wherein the light guide plate is a wedge-shaped light guide plate. 16. The light source module structure according to claim 14, wherein the main light source is located on the incident end surface of the light guide plate to provide an incident light to enter the light guide plate. 17. The light source assembly structure according to claim 14, wherein the auxiliary light source group has a relative oblique angle and is symmetrically arranged on both sides of the incident end surface, so as to provide an auxiliary incident light to enter the light guide plate. 18. The light source module structure according to claim 14, wherein the bottom surface of the light guide plate has a plurality of dots for interfering with the light incident on the light guide plate by the first light source and the second light source. 19. The light source assembly structure according to claim 10, wherein the backlight assembly further comprises: a light guide cover for covering the first light emitting source and reflecting the light emitted by the first light emitting source into the light guide plate; A reflective sheet, located under the bottom surface of the light guide plate, to reflect the light leaked from the bottom surface back to the light guide plate; a diffusion sheet located above the exit surface of the light guide plate; and A prism sheet is located on the diffusion sheet to modify the light direction.

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