JP2011028018A - Both-side luminous display board and edge light - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem, wherein a display board using an edge light is ordinarily a one-side luminous display board, but when both sides of the display board is desired to be made luminous, it is necessary to combine the one-side luminous boards back to back, to make both sides luminous and this causes increase in the thickness and the weight. <P>SOLUTION: An edge light having LEDs arranged in two columns, two light guide plates, a reflecting sheet and two light diffusing sheets are integrated into a single body and are stored in an aluminum frame. Thus a thin and light both-side luminous display board is realized. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention is a technique for expanding the function of an edge light using LEDs. It is possible to emit strong light from a narrow and small space by improving the brightness of the LED. Therefore, a large and bright display plate is being realized by supplying light efficiently and combining with a light guide plate.

The light conversion part provided on one side of the light guide plate can efficiently convert the light of the edge light that emits light with a narrow width that matches the width of the thin light guide plate by the LED, and the light emission display is large and bright The practical use of the board is progressing.

With the advent of LED edge lights, a long-life light-emitting display panel that can significantly reduce the number of light source replacements with low power consumption has been realized.

The light from the edge light travels in the light guide plate, and the technology to change the direction of the light efficiently to create a uniform light surface on the display plate surface has been achieved.

The light is changed in direction and emerges on the surface of the display board. This light is further uniformly dispersed by a light diffusion sheet, and a technology for realizing a planar light emitting plate without light unevenness has been achieved.
JP 2000-305497 JP 2008-96589 JP 2008-166200

The display board with edge light usually emits light on one side. In order to emit light from the back side, it is necessary to assemble a single-sided display panel back to back and emit light from both sides. It becomes thicker and heavier by back to back.

When assembling single-sided light emitting display panels back to back, size adjustment and parts to be assembled are required, and parts and labor costs for assembling two sheets are required.

Since the two display boards are wired separately, the processing of the wiring code is complicated, the appearance is not simple, and the effect of the display board is impaired.

The LED and the two light guide plates are combined in a single aluminum frame. The two light guide plates emit light as they are. The material used is minimal and can be made thin and light.

Aluminum frame and edge light can be finished with one. The structure is simple and troubles due to assembly failure and size differences between the front and back sides are unlikely to occur.

There is one edge light, and there is also one wiring that is taken out as a lead wire. The appearance is simple, and the effect as a display board can be exhibited to the maximum.

A sheet that reflects on both sides is sandwiched between two light guide plates. Double-sided light emission is possible by efficiently directing light diffusely emitted from the light conversion portion of the light guide plate to the board surface.

The light that has come out on the board surface is uniformly diffused by the light diffusion sheet. This realizes a wide, bright and uniform light surface.

A simple double-sided light-emitting display panel can be made with the minimum necessary materials by integrating two light guide plates, one reflection sheet, two light diffusion plates, one edge light, and one aluminum frame.

Thin and lightweight double-sided light-emitting display boards can be used as various signboards. Information can be displayed on the front and back surfaces in a narrow passage or in a limited space in the store.

Since the two light guide plates emit light with one edge light, the light intensity on the front and back surfaces can always be kept the same.

Compared to using two single-sided display panels back to back, fewer materials are used, the assembly process is simple, and manufacturing costs can be reduced.

As shown in FIG. 1, the front surface (1) and the back surface (2) of the display panel are caused to emit light simultaneously.
A double-sided reflection sheet (7) is sandwiched between the front and back surfaces, and the whole is integrated into a single plate.

As shown in Figure 2, the LED light-emitting parts are lined up on one side of the two light guide plates. Light is taken in from there, and the direction of the light is changed by the light conversion part (14) on one side of the light guide plate.

The light that diffuses light at the light conversion part is reflected by the reflection sheet in the direction toward the front surface (1) or the back surface (2). The reflected light becomes a uniform light surface by the light diffusion sheet (6) on the surface, and the effect of the display panel is exhibited.

Fig. 3 is an enlarged cross-sectional view. Light from the LED (8) passes through the light guide plate (5), hits the light conversion section (14), and travels to the front surface (1) and the back surface (2) of the display plate. By mixing with a light diffusion sheet provided on the surface, a uniform light surface can be formed.

Figure 4 shows the structure of the edge light. LEDs are wired in two rows on a thin printed circuit board (9). The printed circuit board is provided with an electrode trunk line, from which several LEDs and a current control circuit (10) are connected by a control line (12) to realize stable lighting.

An electrode trunk line (11) provided on the printed circuit board (9) is connected to the outside by a lead wire (13). There is one edge light, and there is one set of connecting lead wires (13).

FIG. 5 is a sectional view of the edge light. The distance between the two rows of LEDs is converted from the thickness of the two light guide plates, and the distance (15) between the LEDs is suitably between 2 mm and 8 mm.

A light-transmitting printed material is attached to the front surface (1) and back surface (2) of the display panel in FIG. As a result, it is possible to display a display object in which both sides are clearly visible even in a dark place.

By displaying both sides at the same time, it is possible to post to both right and left passers when posting on a passage or the like, and the display effect is doubled.

Double-sided display boards are thin, and when posting in a limited space at exhibitions, etc., more can be posted and the effect is demonstrated.

The integrated double-sided display board is light, the equipment to be attached is also light, and even if it falls, the danger is low.

The wiring of the integrated display board is simple, only one lead wire is required, and there are few failures on the circuit and wiring is easy.

The double-sided display board can be incorporated in the partition board. Display for the target person on the front side and display for the target person on the back side can be performed simultaneously.

Display board front and back Cross section of display panel Cross-sectional enlarged view Edge light structure diagram Cross section of edge light

1 Front face of display board 2 Back face of display board 3 Aluminum frame (small)
4 Aluminum frame (large)
5 Light guide plate 6 Light diffusion sheet 7 Double-sided reflection sheet 8 LED
9 Printed circuit board 10 Current control circuit 11 Electrode trunk line 12 Electrode branch line 13 Lead wire 14 Light conversion part 15 Distance between LED rows

Claims (4)

A signboard and other display board that emits light on both the front and back surfaces simultaneously. A display board and edge light that illuminate LEDs in two rows on a single printed circuit board and emit light simultaneously. When LED chips are arranged in two rows on a thin printed circuit board and a light guide plate is combined in each row, the two light guide plates emit light simultaneously.By providing a double-sided reflection sheet between the light guide plate and the light guide plate, the front and back surfaces are The edge light according to claim 1, which emits light efficiently. The edge light according to claim 1, wherein when the LED chips are arranged in two rows, the LED row spacing is between 2 mm and 8 mm, estimated from the function of the light guide plate. One edge light with two rows of LEDs and two light guide plates, one double-sided reflection sheet in the center, a light diffusing sheet attached to the surface of the light guide plate, the whole is integrated, the front and back emit light The display board according to claim 1, wherein the display board is configured as described above.