JPH0555128U - LCD backlight - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the thickness of the LCD backlight. [Structure] A liquid crystal display backlight includes a substrate 14 and a substrate 1.
4 and a casing 16 made of a transparent material and provided on the substrate 14, and the outer surface 1 of the casing.
Reflective film 18 extending from 6b to the back surface 14b of the substrate
The substrate 14 is integrated by. [Effect] Pins for integrating the substrate 14 and the housing 16 are not required, and the thickness of the device can be reduced. Moreover, the number of parts is small and the manufacturing process can be simplified, which is economical. Furthermore,
The reflective film 18 on the back surface 14b of the substrate can efficiently illuminate the display port 17 and brighten the liquid crystal display portion.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a backlight for a liquid crystal display.

[0002]

[Prior Art]

 2. Description of the Related Art Conventionally, a liquid crystal display device including a liquid crystal plate and a backlight for illuminating the liquid crystal plate from the rear side to raise characters, pictures, and the like displayed on the liquid crystal plate has been widely used. As shown in FIG. 3, the liquid crystal display device includes a liquid crystal plate 2 and a backlight 3. The back light 3 is provided with a plurality of LED chips 5 and the like on the periphery of a substrate 4, and the substrate is covered with the LED chips 5. A transparent housing 6 is placed on the surface 4. The transparent housing 6 has a reflection film 8 attached to the upper and side surfaces of the substrate 4 excluding a display port 7 for illuminating characters and pictures displayed on the liquid crystal plate 2, and a similar reflection film 9 on the substrate 4. In addition, the scattered light other than the display port 7 of the light L from the LED chip 5 is guided to irradiate the display port 7.

[0003]

[Issues to be solved by the device]

 By the way, in the substrate 4 of such a liquid crystal display device 1, the pin 11 is inserted into the through hole 10 provided in the substrate 4 to fix the housing 6 and the substrate 4, and between the pin 11 and the through hole 10. In order to prevent light from leaking from the gap that is inevitably generated, the through hole 10 is covered with a metal plate 12 or the like so as to be caulked. However, the thickness of the metal plate 12 for caulking differs depending on the size of the pin 11, but a thickness of about 0.2 to 0.5 mm is essential, which is against the thinning of the metal mold of the apparatus. ..

Further, the reflection film 9 cannot be attached to the portion where the pin 11 is provided, and when the substrate 4 transmits the light from the LED chip 5, the light leaks. The present invention has been made in order to solve the above-mentioned drawbacks. In addition to reducing the thickness of the device, the liquid crystal plate can be efficiently illuminated by the light from the light emitter, and the display section can be brightened. Therefore, it is an object of the present invention to provide a backlight for a liquid crystal display, which can simplify the manufacturing process.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, a liquid crystal display backlight of the present invention comprises a light-emitting body which is disposed on a substrate and emits light for illuminating a liquid crystal plate, a housing made of a transparent material provided on the substrate, and A backlight for a liquid crystal display comprising an outer surface of a housing and a reflective film attached to the substrate to reflect the light, wherein the reflective film attached to the outer surface of the housing extends to the back surface of the substrate. The board and the housing are extended to be integrated with each other.

[0006]

[Action]

 By extending the reflective film attached to the outer surface of the housing to reach the back surface of the substrate, the housing and the substrate are integrated. Therefore, the pin for fixing the housing substrate is not necessary, and therefore the through hole for inserting the pin is not required. Moreover, the reflection film extending to the back surface of the substrate can prevent light from leaking from the peripheral portion of the substrate on which the light emitting body is provided, and the display unit can be efficiently illuminated.

[0007]

【Example】

 An embodiment to which the liquid crystal display backlight of the present invention is applied will be described with reference to the drawings. As shown in FIG. 1, the backlight 13 that illuminates the liquid crystal plate 2 from the rear side to bring up the characters and pictures on the liquid crystal plate 2 is provided with a plurality of light emitters 15 in the peripheral portion of the substrate 14. The light-emitting body 15 may be an LED chip, a fluorescent tube or the like. A housing 16 made of a transparent material such as acrylic resin is placed on the substrate 14. Then, from the upper surface 16a of the housing 16 excluding the display port 17 of the liquid crystal plate 2, the outer surface 16b, the side surface 14a of the substrate 14, and the reflective film 18 extended to the back surface 14b of the substrate, are attached. 16 and the substrate 14 are integrated. The reflection film 18 is, for example, a synthetic resin film obtained by vapor deposition of aluminum or the like, and has a thickness of 0.1 to 0.2 mm.

Further, the reflection film 19 is attached to the central portion of the upper surface 14 c of the substrate 14 where the light emitter 15 is not attached. The substrate 14 in which the side surface 14a and the back surface 14b of the substrate 14 are covered with the reflective film 18 may be made of the same transparent material as the case 16. According to the backlight 13 having such a configuration, the light L ₁ from the light emitting body 15 is reflected by the reflection films 18 and 19 and is collected in the display port 17. Further, the light L ₂ emitted from the light emitter 15 in the direction of the back surface 14b of the substrate 14 is also reflected by the reflection film 18 and the display port 17 is efficiently illuminated.

Further, as shown in FIG. 2, the reflective film 18 does not cover the entire back surface 14 b of the substrate 14, but may cover only the peripheral portion of the substrate back surface 14 b. Further, the reflection film 18 may cover four side surfaces of the housing 16 and the substrate 14 or may cover only two side surfaces.

[0010]

[Effect of the device]

 As is clear from the above description, according to the liquid crystal display backlight of the present invention, since the housing and the substrate are fixed by the reflective film, the fixing pin is unnecessary, and therefore, the pin and the substrate are not fixed. This eliminates the need for caulking to eliminate the gap between the two, and the device itself can be made thinner, and the number of parts is small and the manufacturing process can be simplified. Moreover, the reflected light from the light emitting body can be efficiently applied to the display section, and the liquid crystal display can be made bright.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a liquid crystal display backlight of the present invention.

FIG. 2 is a cross-sectional view of another embodiment of another backlight for liquid crystal display.

FIG. 3 is a diagram showing a conventional liquid crystal display backlight.

[Explanation of symbols]

13 ………… Backlight 14 ………… Substrate 14b ………… Backside of substrate 15 ………… Light emitter 16 ………… Case 16b ………… Side side 18, 19 ………… Reflection Film L ₁ , L ₂ ………… Light

Claims (1)

[Scope of utility model registration request] 1. A light emitter disposed on a substrate to emit light for illuminating a liquid crystal plate, a casing made of a transparent material provided on the substrate, and attached to an outer surface of the casing and the substrate. A backlight for a liquid crystal display, comprising: a reflection film for reflecting the light, wherein the reflection film attached to the outer surface of the housing is extended to the back surface of the substrate to integrate the substrate and the housing. A backlight for a liquid crystal display, which is characterized by being provided.