TWI258553B - Backlight module - Google Patents

Abstract

The present invention relates to a backlight module. The backlight module comprises a light source, and a light guide plate can direct light coming from the light source. The light guide plate includes an incident surface, a light emitting surface crossing to the incident surface a bottom surface being opposite to the light emitting surface. The bottom surface has a plurality of light diffusion unit therein, and has a fluorescent film thereon.

Description

1258553 V. INSTRUCTION DESCRIPTION OF THE INVENTION (1) Technical Field of the Invention A backlight device, in particular, a nine-type backlight device with a higher brightness than that of a light source. [Prior Art] In the pen, the display device is light, sturdy, and consumes a small amount of power. It is widely used in military, computer, mobile phone, personal digital assistants and other modern times. Tian Mo V· Bei e and u Ma liquid crystal display itself does not have luminescence characteristics, two provide t light source to achieve display function. As is well known, the backlight device needs to have a high light-emitting brightness, and the uniformity of the output and the sentence should reach a predetermined requirement, thereby improving the color of the liquid crystal display: the brightness effect of the full-screen area and the viewing angle of the whole machine. ^ Outside, for the appropriate α = not light, thin requirements 'its structural design can not be too complicated. 11-11, a prior art backlight device 10 includes a lamp tube 12 and a light guide plate 13 surrounded by a lamp cover portion. The lamp tube 12 is provided with a phase 12, and the light guide plate 13 is guided from the light source of the lamp. In the transmission direction, the line source or the dot network point 138 is used for; ^ #秦an board bottom 132 is distributed with a plurality of pieces, and the total reflection strips transmitted inside the board 13 are buckled/radiated to illuminate with the light guide plate 13夕沾,隹和疏&Lens backlight device 1 〇 整体 # 句 句 句 句 句 句 句 句 句 句 句 句 句 句 句 句 句 句 句 认 认 认 138 138 138 138 138 138 138 138 138 138 138 138 138 138 138 138 138 138 138 138 138 It is a square, circular ς = month light source device because the light beam i emitted by the lamp 12: or = and so on. When the beam of 12 is transmitted inside the light guide plate 13: := range ' comes from the lamp tube, and various situations will occur, for example,

Page 5 1228553 V. INSTRUCTIONS (2) After the beam 1 2 1 is scattered by the dot 丨3 8 during transmission, it no longer conforms to the total reflection condition 'and thus exits from the light exit surface 134; the beam 1 2 2 It always escapes from the end surface 135 of the light guide plate 13 in accordance with the ί ^ Ϊ condition; in addition, the light beam 123, the other day, "because the non-conformity condition is not met, the ground point 1 3 2 is not set to escape from the bottom point ^" Reduce the beam utilization and affect the brightness of the backlight unit 1 . For the use of the light beam in the south, it is usually adjacent to the end face and the bottom surface without a reflector - (not shown), or on the bottom surface 132 or the end surface 135 ^ 士 ^ ^ 图 (not shown), but the beam on the reflector and guide Energy loss occurs when the light board is transferred between the 13 and the effect is not ideal. The homing technique is used to enhance the brightness by directly illuminating the light exit surface of the light guide plate opposite to the bottom surface. However, this prior art beam is missing from the bottom surface due to non-compliance with total reflection conditions. In addition, due to V-casting: the light-collecting effect of t often interferes with the integral structure of the dot-slabs, and the v-grooves are evenly formed and even formed; the effect of the uniform light-conducting light is reduced by 0, in view of this, a kind is provided. Light-emitting devices are necessary.背光 呵 结构 结构 结构 结构 结构 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 【 The backlight device of the present invention comprises a light source and at least one light incident surface and a light incident surface, and the bottom surface of the light emitting surface is surrounded by a V light plate, wherein the bottom surface has a plurality of light emitting surfaces 2 and a light emitting surface and a light emitting material to form a light emitting coating. The light fishing m is early, and the bottom surface is coated with light to make it correspond to the light incident surface.

1258553 V. DESCRIPTION OF THE INVENTION (3) The backlight of the present invention is a light-emitting material. Among them, among them, among them, among them, among them, increase and increase. Among them, among them, the beam illuminating material which is coated with the photo-conditioning condition is simple and easy to use. [Embodiment, please refer to the second image source device. Further @& The luminescent material is the fluorescent material system, and the photo-sensing material is used. The phosphorescent material is an alkaline earth material of the photoluminescent material. The complex scatters the monoluminescent material. The plurality of dots are: dots or V-grooves. The size of the plurality of dots will be , , , L, soil, and the bottom surface of the light plate. The density of the plurality of dots is transmitted in a direction away from the light incident surface, and further includes a neighboring guide. The light source is a point source or a line source. i i::: ? Diode or cold cathode fluorescent lamp. 4 light exit surface is rough and rough. Compared with the technology, the present invention has a luminescent material that constitutes a luminescent coating. : 3 Due to the adjustment of the optical path at the bottom of the light guide plate, the light 2 can be increased, and the light source is excited by the light source, and the light is emitted, and the light is used. In addition, compared with the prior art i, the backlight is mounted. The backlight device 20 of the present invention includes a plurality of point light sources.

1258553 V. Inventive description (4) 21 and a light guide plate 22, the light guide plate 22 guides the white light 1 ν from the light source 21 to emit a beam of light, and converts it into a surface light source. The point light source 2 1 can be a light emitting diode, a T or a small light bulb. The desired color and brightness of the light source can be formulated by configuring a plurality of different color LEDs or small p ^ ^ ^ X J k bubbles. The light guide plate 2 2 is formed in a flat shape, and is made of a transparent material such as acryl, polycarbonate or polycarbonate. Including the light incident surface? ? 1 , τ ^ Κ ^ is discharged by 1, the light exit surface 22 2 intersecting the light incident surface 221 and the relative light exit surface 2? 9 + - _ (1) back to the "2 bottom surface 2 2 3 and the complex side 2 24, the bottom surface 223 has a complex scattering-shaped pair of 23, and the bottom surface 223 is coated with a photoluminescent material to form a luminescent coating 24, and the π 0, ^ 4 point source 21 corresponds to the light incident surface ζ 又 又The incident surface 2 2 1 is used to receive the light beams emitted by the point source, the shop 0, & the sigh point source 2 1 , and the light incident surface 221 is respectively recessed toward the surface of the point source 21 to be curved to facilitate the fixing. The point light source 2 is well coupled with the light path. The light exit surface 222 can be processed into a rough surface with a certain roughness to make the emitted beam brightness distribution more uniform. Please refer to the third figure, the light guide plate The scattering unit 23 disposed on the bottom surface of the 22 is a printed or injection molded dot to destroy the total reflection condition of the light beam transmitted in the light guide plate 22, and enhance the brightness and uniformity of the outgoing beam. 3 The size of the scattering unit 2 3 The system is incrementally moved away from the light incident surface 2 2 1 , which is spherical. However, the scattering The unit 23 can also be cylindrical, square, pyramidal or other suitable shape. The scattering units 23 can also be equal in size and equally spaced on the bottom surface 223 (refer to the fifth figure). The density of the scattering unit 23 is also It can be increased in a direction away from the light incident surface 221.

1258553 V. Inventive Description (5) Alternatively, a plurality of V-grooves (not shown) may be provided on the bottom surface 223 to alternate the scattering unit 23. Can also set a plural number on the light exit surface 22 2? The groove ^ j shows).曰,图未# Please refer to the fourth figure, because the beam emitted by the point source 2 has a range of -^ degrees, and the beam from the point source 2 1 is transmitted inside the light guide 22, and in various cases, the beam 2 1 1 is transmitted. After passing through the scattering unit 2 in the wheel process, the total reflection condition is no longer met, so that the 2 beams 212 from the light exit surface 2 2 2 are self-guided because they always conform to the total reflection condition. The light-emitting surface 222 η And the use rate of light is increased, and the photoluminescence material emits light due to the excitation of the light beams 2H, 212, and 213, and the light emission of the original light is 20. The fine structure of the raw material 25 is captured. This anvil technique stops the luminescent material of the Umbrella layer 24, and the general coating ^^, 5 can be part of the light that the fluorescent material or the phosphorous ultraviolet ray transform will absorb (the package emits light, and the hue of the reflected light is similar The light from the first beam is improved. The squama material used in this = needs to have a long length, is not easy to age and afterglow, when it is a self-acid silicate phosphor material and right... choose, ', "u2+ start The afterglow property of the alkaline earth aluminous body is extremely superior to that of ^^. SrA1 204: Eu2+ phosphorus is 5 to 10 times higher; t: the afterglow brightness of the lag time is 2_min, and such materials are In the comprehensive report, the patent application was issued. Only 1258553 Explanation (6) -----1~ The photon efficiency, afterglow time and stability are superior to the traditional long afterglow ZnS type materials, and the radioactive material contamination can be avoided. The fluorescent material used in the present invention can be vulcanized. Fluorescent inorganic pigments of CCadmiun-zinc Sulfide, or cadmium zinc sulfide, whose chemical equation is ZnSn-CdS(i_n) ·· A, where n varies from 〇·15 to κ 〇, and A (active agent) stands for Cu, Ag or Μη, their composition changes between 〇·〇〇3%~〗·〇%. Another 'rare earth photoluminescent material can also be applied to the backlight device of the invention. ^ To improve the beam utilization rate, The bottom surface 2 2 3 and the side surfaces are usually plated with a reflective film or a reflective plate (not shown) to reflect the light from the bottom surface 2 2 3 of the light guide plate 2 or the side surface to return to the light guide plate 2 2 . The light exit surface 222 exits the light incident surface 22i and the light exit surface 222 with an anti-reflection film to reduce the absorption loss of the light energy. However, when the light beam is transmitted between the reflector and the light guide plate 2, energy loss occurs. Not ideal. ^Only the backlight device of the present invention may also have its The method of improving or replacing is as follows: 'The point source in the present invention can also be replaced by a line source such as a cold cathode fluorescent lamp, and the light guide plate can also be a wedge shape. The wedge type light guide plate is different from the flat plate type light guide plate in that The bottom surface and the light incident surface intersect at an acute angle. The moonlight source device may further be provided with a plurality of point light sources on at least one side of the light guide plate, and the light incident surface may also be plated with a layer of fluorescent or phosphorescent material to improve the light guide plate. The luminance uniformity of the backlight device is further improved, and the brightness of the backlight device is further improved. The present invention has indeed met the requirements of the invention patent, and the above is only the preferred embodiment of the present invention.

1258553

Page 11 1258553 BRIEF DESCRIPTION OF THE DRAWINGS The first figure is a partial optical path diagram of a prior art backlight device. The second drawing is a perspective view of a first embodiment of a backlight device of the present invention. The third figure is a schematic diagram of the dot distribution of the backlight device shown in the second figure. The fourth figure is a partial optical path diagram of the backlight device shown in the second figure. Fig. 5 is a schematic view showing the dot distribution of the second embodiment of the backlight unit of the present invention. The sixth figure is a micro-structure diagram of the luminescent coating of the backlight device shown in the second figure. [Description of component symbols] Backlight device 20 Light source 21 Light guide plate 22 Dot 23 Luminous coating 24 Light incident surface 221 Light exit surface 222 Bottom surface 223 Side 224 Luminescent material 25

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Claims (1)

1258553 VI. Patent application scope 1. A backlight device comprising: a light source that emits a light beam; a light guide plate guiding the light beam emitted by the light source, comprising at least one light incident surface, a light exit surface intersecting the light incident surface, and relative light a bottom surface of the exit surface; wherein the bottom surface has a plurality of scattering units, and the bottom surface is coated with a photoluminescent material to form a light-emitting coating, and the light source is disposed corresponding to the light incident surface. 2. The backlight device of claim 1, wherein the photoluminescent material is a fluorescent material. 3. The backlight device of claim 2, wherein the fluorescent material is a cadmium zinc sulfide or a zinc sulfide pigment. 4. The backlight device of claim 1, wherein the photoluminescent material is a phosphorescent material. 5. The backlight device of claim 4, wherein the phosphorescent material is a soil-filling material. 6. The backlight device of claim 1, wherein the photoluminescent material is a rare earth photoluminescent material. 7. The backlight device of claim 1, wherein the plurality of scattering units are dots. 8. The backlight device of claim 7, wherein the plurality of dots are equally spaced on the bottom surface of the light guide plate. 9. The backlight device of claim 7, wherein the plurality of dots are increased in size in a direction away from the light incident surface. 1 0. The backlight device of claim 7, wherein the complex Page 13 1258553 VI. Patent Application Range The density of several dots is increasing along the direction away from the light incident surface. 11. The backlight device of claim 1, further comprising a reflective plate disposed adjacent to a bottom surface of the light guide plate. The backlight device of claim 1, wherein the light source is a point source or a line source. The backlight device of claim 1, wherein the light source is a light emitting diode or a cold cathode fluorescent lamp. The backlight device of claim 1, wherein the light exit surface is thicker than the surface. The backlight device of claim 1, wherein the plurality of scattering units are V-shaped grooves. Page 14