CN103605437A

CN103605437A - Led display screen

Info

Publication number: CN103605437A
Application number: CN201310549592.8A
Authority: CN
Inventors: 张涛
Original assignee: Vtron Technologies Ltd
Current assignee: Vtron Group Co Ltd
Priority date: 2013-11-07
Filing date: 2013-11-07
Publication date: 2014-02-26
Anticipated expiration: 2033-11-07
Also published as: CN103605437B

Abstract

An LED display screen comprises LEDs, at least one photosensitive diode inserted among the LEDs, and a screen body attached in front of the LEDs and the photosensitive diodes. When pressure is applied on the outer surface of the screen body, the surface of the screen body can slightly deform, changing of angle of LED incident light is caused, LED light is reflected onto the photosensitive diodes, reverse current is increased when the photosensitive diodes are irradiated by light, and coordinates of touch or click can be determined by detecting the reverse current of the photosensitive diodes, so that touch of the LED display screen is realized.

Description

LED display

Technical field

The present invention relates to touching technique field, particularly relate to a kind of LED display.

Background technology

Along with growing with each passing day of scientific and technological development and electronic product, touch-screen with its be easy to use, reaction velocity is fast, save the advantages such as space, be widely used.Traditional touch-screen, according to the medium of principle of work and transmission information, is divided into resistance-type, capacitor induction type, infrared-type and surface acoustic wave type.

LED(Light-Emitting Diode, light emitting diode) display screen, by several ten thousand-hundreds of thousands semiconductor light-emitting-diode (LED) pixel evenly distributed composition, utilizes different materials can manufacture the LED pixel of different color.LED display has that colour mixture is good, reliability is strong, visible angle is large, permeability is high, brightness advantages of higher.But also do not realize the technology that LED display touches at present.

Summary of the invention

Based on this, be necessary for the problems referred to above, a kind of LED display that can touch is provided.

A LED display, comprises at least one photodiode of inserting between LED, LED, is affixed on the screen before each LED and photodiode.

Above-mentioned LED display, LED is luminous in the situation that having electric current to pass through, when described offscreen surface is exerted pressure, described offscreen surface can produce faint deformation, cause LED incident angle of light to change, LED light is reflected on photodiode, and when photodiode is subject to irradiation, inverse current increases, by detecting the inverse current of photodiode, can determine the coordinate that touches or click, thereby realize the touch of LED display.

Accompanying drawing explanation

Fig. 1 is the structural representation of the embodiment of the present invention one;

Fig. 2 is the principle schematic of the embodiment of the present invention one;

Fig. 3 is the floor map of LED of the present invention and LSD embodiment mono-;

Fig. 4 is the floor map of LED of the present invention and LSD embodiment bis-;

Fig. 5 is the floor map of LED of the present invention and LSD embodiment tri-;

Fig. 6 is the structural representation of the embodiment of the present invention two;

Fig. 7 is the structural representation of the embodiment of the present invention three.

Embodiment

Mode below in conjunction with accompanying drawing with specific embodiment is described in detail the concrete operations mode of LED display of the present invention.

Embodiment mono-

As shown in Figure 1, a kind of LED display, comprises at least one photodiode (LSD) 20 of inserting between LED10, LED10, is affixed on the screen 30 before each LED10 and LSD20.

As shown in Figure 2, LED10 is luminous in the situation that having electric current to pass through, when described screen 30 outside surfaces are exerted pressure, described screen 30 outside surfaces can produce faint deformation, while causing light that the LED10 in corresponding region sends to incide corresponding screen inside surface, angle changes, the incident light of LED10 by screen internal surface reflection to LSD20, when LSD20 is subject to irradiation, inverse current increases, by detecting the inverse current of LSD20, can determine the coordinate that touches or click, thereby realize the touch of LED display.

As shown in Figure 3, as a kind of preferred embodiment, at interval of a LED10, insert a LSD20.Like this when touching or click the optional position of screen, there is the LED10 incident light of respective regions to be reflected on adjacent LSD20, by detecting the inverse current of corresponding LSD20, can determine on screen and to touch arbitrarily or the coordinate of click location, touch precision higher.

In addition, can also the different requirements to the touch degree of accuracy of touch signal according to screen, adjust the quantity of LSD20.As shown in Figure 4, can insert a LSD20 at interval of more than one LED10, for example every 4 LED10, insert a LSD20, also can realize the full frame touch of LED display, but may be when touching from LSD20 the screen area away from, because do not reflex to the light of LSD20 or reflex to the light of LSD20 faint, and can't detect the curent change of LSD20, just possibly cannot determine and on screen, touch or the coordinate of click location, lower while touching precision with respect to the LED10 in interval.

If user only need to realize touch function in certain region, can only consider to insert in this region LSD20, as shown in Figure 5, when if the LSD20 inserting between LED10 is less, as 1, only during near the region touching LSD20, it is upper that LED10 incident light is just likely reflected to LSD20, and the local of realizing LED display touches.

Embodiment bis-

Embodiment bis-is the further optimization to embodiment mono-, and described LED display also comprises stickum 40.

As an embodiment, as shown in Figure 6, can as stickum 40, described screen 30 be affixed on before each LED10 and LSD20 by bonding agent or epoxy glue or hot melt adhesive or the sticking material of other tools.Like this each LED10 and LSD20 just can with seamless firm connection of described screen 30, make LED display firmly firm.

In a specific embodiment, the refractive index of the refractive index of the refractive index of described screen 30, LSD20 encapsulating material, the refractive index of LED10 encapsulating material, described stickum 40 equates.When above-mentioned refractive index equates, the light that LED10 sends does not reflect while inciding successively LED10 encapsulating material and stickum 40 interfaces, stickum 40 and screen 30 interface, guarantees that the light that LED10 incides screen 30 and air interface is straight line.In like manner, corresponding reflection ray does not reflect during successively through the interface of the interface of screen 30 and stickum 40, stickum 40 and LSD encapsulating material, and the light that guarantees reflection is straight line while inciding LSD20.Reduce like this LED10 light and when the propagation such as described stickum 40, described screen 30, reflected the energy loss of bringing, more luminous energy is incided on LSD20, then according to the size judgement of LSD20 electric current, touch the position coordinates of clicking, improve judgement and touch the precision of clicking.

In the situation that above-mentioned refractive index is equal, can also be according to the larger material of total reflection formula selective refraction rate as screen 30 etc., when touching or click screen 30 outside surface, when inciding screen 30 and air interface, LED10 light is easily greater than critical angle, thereby generation total reflection, make more light energy reflected upper to LSD20, improve the sensitivity that LSD20 detects electric current, thereby further improve, touch the precision of clicking.

Other technical characterictic of the present embodiment is identical with embodiment mono-, does not repeat them here.

Embodiment tri-

Embodiment tri-is the further optimization to the various embodiments described above, and described offscreen surface is posted reflective membrane.

As an embodiment, as shown in Figure 7, described screen 30 outside surfaces can post reflective membrane 50.Described reflective membrane 50 extraneous ray of reflecting, make screen 30 Unidirectional transparents, i.e. the direction of A to B shown in figure printing opacity.So extraneous light incident is upper less than LSD20, greatly reduces the impact that LSD20 is detected to electric current, thereby more accurate and sensitive judgement touches click location.

As a preferred embodiment, can select transparent material as screen 30, the content that LED display is shown can be seen from the outside, has improved the practicality of product.The material of described screen 30 can be glass, resin, plastics or other any transparent materials.

Other technical characterictic of the present embodiment is identical with the various embodiments described above, does not repeat them here.

The above embodiment has only expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.

Claims

1. a LED display, comprises LED, it is characterized in that, also comprises at least one photodiode of inserting between described LED, is affixed on the screen before each LED and described photodiode.

2. LED display according to claim 1, is characterized in that, at interval of a LED, is inserted with a photodiode.

3. LED display according to claim 1, is characterized in that, also comprises described screen is affixed on to the stickum before each LED and photodiode.

4. LED display according to claim 3, is characterized in that, the refractive index of the refractive index of described stickum, the refractive index of described screen, described photodiode encapsulating material, the refractive index of LED encapsulating material equate.

5. LED display according to claim 3, is characterized in that, described stickum comprises bonding agent or epoxy glue or hot melt adhesive.

6. according to the LED display described in claim 1 to 5 any one, it is characterized in that, described offscreen surface is posted reflective membrane.

7. LED display according to claim 1, is characterized in that, the material of described screen is transparent material, and described transparent material comprises glass, resin, plastics.