TW201022743A - Light-guide plate - Google Patents

Abstract

A light-guide plate for guiding light emitted from a light source is provided. The light-guide plate includes a transparent layer and a plurality of cut grooves. The transparent layer includes a light entering surface, a first planar, and a second planar, wherein the light source is disposed adjacent to the light entering surface. An edge of the first planar is connected to the light entering surface, and the first planar is disposed opposite the second surface. The cut grooves are formed on the first planar, and each cut grooves is extended along an extending direction. The perpendicular distance from an edge of each cut groove to the corresponding extending direction is defined by a first sinusoidal function according to the extending direction. And the depth of each cut groove is defined by a second sinusoidal function according to the extending direction. The figure of each cut groove is varied consciously along the extending direction, thus the light refracted exits the first planar uniformly and negative effect due to the defects or dust is also eliminated.

Description

201022743 IX. Description of the Invention: [Technical Field] The present invention relates to a light guide plate applied to a backlight module, and more particularly to a light guide plate which can improve yield and reduce production cost. [Prior Art] The liquid crystal panel requires light to penetrate the liquid crystal layer, and the human eye can observe the change of the liquid crystal layer. The current liquid crystal panel uses a backlight module to project light from the back side of the liquid crystal layer, and the light provided by the backlight module must uniformly penetrate the liquid crystal layer, and the light projected onto the liquid crystal layer must have a uniform brightness. However, the light source type is a tubular light source, such as a cold cathode tube, and the light emitted by the tubular light source cannot be uniformly and uniformly projected onto a plane. Therefore, the optical structure of the backlight module must be such that the light uniformly and uniformly penetrates the liquid crystal layer. The backlight module is classified into two types according to the position of the light source. The direct-lit backlight module and the side-lit backlight module. The side-lit backlight module projects light from the lateral edge of the light guide plate into the light guide plate. The level of the light guide plate enters the light guide (4) to reflect or refract the light through the light guide plate. The towel, which refracts light passing through the bottom surface of the light guide plate, is reflected by the reflective sheet or the reflective layer and enters the light guide plate again. Finally, most of the light will leave the top surface of the light guide. In order to make the light needle forward away from the light guide plate, the luminance is raised, and the luminance is uniformly distributed to the top of the light guide plate to create a light collecting effect, and the light is uniformly passed through the top surface of the guide. The touch structure county is a v-face micro-dragon, and through the change of the micro-groove pattern and the improvement of the level (four) wire, the problem that the light-emitting surface of the light guide plate is not bright or dark due to the distance from the light source is solved. 5 201022743 Micro-grooves are formed on the filaments of JL Linshu through the micro-carving office. The scales and micro-grooves show regular changes on the surface of the transparent substrate to refract light and change the current direction of light. Each micro-groove is responsible for - the refraction of light in a particular area' so the surface of the micro-groove must be fairly smooth to produce a positive 4-ray refraction effect. If defects occur on the surface of the micro-grooves during processing or if there are dust spots, these defects are easily observed. The foregoing problems have caused problems in that the light guide plate yield is poor, and the processing is time consuming and costly. SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a light guide plate which can prevent defects or dust from being generated, thereby improving processing yield and reducing production cost. In order to achieve the above object, the present invention provides a light guide plate for guiding a light source of a light source, which comprises a light transmitting layer and a plurality of micro grooves. The light transmissive layer has a light incident surface, a first plane and a second plane, and the light source of the towel is disposed on the side of the human light surface and the first plane is connected to the light incident surface and opposite to the second plane. The micro-grooves are disposed on the first plane, and the micro-grooves respectively extend along the extending direction, wherein the vertical distance from the edge of each micro-groove to the extending direction is a -first-sinusoidal waveform along the direction of the ❹ L, and each micro-riding The bottom heterozygosity changes in a direction of extension - a second sinusoidal waveform. The continuously changing micro-trench is used to refract the light of the light source, so that the light is uniformly separated from the first plane, and the defect or the dust is formed into a plague. The invention is based on the fact that the deep-width width of the light-weighted emblem can be mis-defective or caused by dust. Therefore, the light guide plate of the present invention can be produced without requiring high processing precision, thereby reducing the processing cost and improving the processing yield. [Embodiment] Referring to Figures 1 and 2, a light guide plate 100' disclosed in the first embodiment of the present invention is used to guide the light of a light source, change the direction of the light, and evenly illuminate the light. Through a liquid crystal panel. The light guide plate 100 includes a light transmissive layer 110 and a plurality of micro trenches 120 formed on the light transmissive layer 110.

Referring to FIG. 1 , FIG. 2 , FIG. 3 and FIG. 4 , the light transmissive layer 110 has a light incident surface 113 , a first plane Π 1 and a second plane 112 , and the first plane U1 and the first plane The planes 112 are respectively connected to opposite sides of the light incident surface 113, and the first plane hi is opposite to the second plane 112. The light source 9 is disposed on one side of the light incident surface, and the light enters the light transmitting layer 11G through the light incident surface. The light is projected in all directions centering on the light source coffee, wherein portions of the light are projected toward the first plane m, and the remaining portions are projected toward the second plane 112. Further disposed on the second plane 112 - a light reflecting layer or a reflector to reflect light - causes light incident on the second plane 112 to travel toward the first plane (1). A plurality of micro-grooves 120 are juxtaposed and arranged in the direction of an extension X, wherein the direction of extension is away from the human surface (1) = the groove is like a dragonfly, the fine coffee is tender, that is, the plum please The vertical distance from the edge to the extending direction is such that the edge (four) of each microgroove 12G is subjected to a wave change. ^ The depth of the bottom of the groove 120 also exhibits a sine wave function variation. The depth of the micro groove is a second sinusoidal waveform along the extending direction. The depth pattern exhibits a periodic wave-like change in the depth pattern. The function of the first-sinusoidal waveform at the bottom of the micro-groove 120 is: r = :ViW = sin"-+ household\2ηπ 7 201022743 It can adjust the relative position and absolute position of the micro-groove according to the needs of practical applications. The function of the first sinusoidal waveform is corrected to:

Where 'a is the amplitude of the first sinusoidal waveform, η is the width of the micro-trench 120 and the period of the depth change' η is between 3 and 500 microns, that is, after the distance η along the extending direction, The width of the trench completes a periodic change (a complete sine wave waveform is present). ρ • is the initial phase, and the first sinusoidal function γ corresponding to the edge of each micro-groove 120 is the same phase, so the Ρ value is the same. The first sinusoidal function corresponding to the edge of the adjacent two micro-grooves 12〇 is different in phase, forming an interlaced waveform, so that the ρ value thereof has a phase difference, and the phase difference is /2. A constant is a median value of the first sinusoidal waveform. The width of the micro-grooves 120 varies between 3 and 10 microns, that is, the width of the micro-grooves UO is at least 3 microns and the maximum is no more than 5 microns. The amplitude of the first sinusoidal waveform is twice the width of the micro-groove, and the width of the micro-groove can be expressed as:

It can also be modified according to the requirements of the actual application, and the relative width and absolute width of the micro-groove are adjusted according to the position γ to correct the function:

Where 'b is 3 microns (Sin(x/2n; r+ ρ) = 最小 has the smallest width), and 0 is less than 497 microns (Sin(x/2n7r) = l has the maximum width). 201022743 The function of the 'human' depth H trace is: It can also be modified according to the function of the real temple field and the absolute depth with the width w and the depth of the sinusoidal waveform.

The width and depth change period of the micro-flat (10) micro-vehicle (10), the η value is between 3 and 5, which means that the cycle is traversed along the extending direction, and the temperature is 70. Sine wave waveform). The second sinusoidal function ζ(χ) of the adjacent two micro-grooves 120 is a phase, and the waveform of the shape is wrong. Therefore, the value of ρ has a phase difference, which is the phase difference. Heart/2 is the best.

The peaks of the depths of the micro-grooves 120 are between 1 and 50 microns, that is, the micro-grooves are at most 1 to 50 microns. The c value is the amplitude of the second sinusoidal waveform, and the bed of the micro-groove varies between 3 and 5 〇〇 micrometers, that is, the amplitude c of the second sinusoidal waveform is between 3 and _micrometers. The d value is a constant and is the middle value of the second sinusoidal waveform. The micro-grooves 12 持续 whose depth and width are constantly changing, produce a good refractive and guiding effect of the wire, so that the ray of the _th-plane U1 is staggered in the direction of travel. When a processing defect or dust occurs on the micro-groove 120 or the first plane 1U, the light refracted by the adjacent area can conceal the resulting light guide pupil. Therefore, the light guide plate 1 of the present invention can be manufactured without requiring high processing precision, thereby reducing the processing cost and improving the processing yield. As described above, the micro-grooves 120 whose depth and width are continuously changed are such that the first plane 201022743 (1) is densely covered, and the light guide plate 100 may further include a plurality of spaced planes 130 located in the adjacent two microgrooves. Between the slots 12Q, qing, (1) is not __ _ constitution, φ also includes the spacing plane 13 〇 between adjacent micro-grooves 12 〇, the spacing plane (10) is the part of the first plane without micro-processing procedures The presence of the spacer plane (10) represents a reduction in the number of micro-grooves 120 and a reduction in the man-hour required for micro-engraving the micro-grooves 120. Each of the aforementioned spacer planes 13A has a width ranging from 3 to _micron to maintain an appropriate ratio of the micro-grooves, wherein the micro-grooves 12 〇 and the spacer planes are projected on the first plane. The area ratio system is optimal from 1/2G to 20. Referring to Fig. 5, n is the width variation period of the micro-groove 12 ,, the n value is between 3 and 5 〇〇 micrometers, the η value can be varied within the adjustment range, and the width and depth are changed to make the micro-groove (10) Presenting different length and width _, the axis of the 5th break (10) _ the change of the type of the read groove. Referring to FIG. 6 , FIG. 7 , FIG. 8 and FIG. 9 , the light guide plate of the second embodiment of the present invention includes a light transmissive layer 210 and is formed on the light transmissive layer. A plurality of micro-grooves 220. In the first embodiment, the width and depth of the micro-grooves m exhibit a sinusoidal waveform variation in a fixed range, and in the second embodiment, the width and depth of the micro-grooves are increased along the extending direction x. The change, that is, the peak of the first-sinusoidal waveform 丫(1) (the direction of the extension of the contact edge increases. The valley or trough of the second sinusoidal waveform χ(χ) increases in the direction of the extension 2, that is, the scale of each micro-groove 22 () or The trough increases with the distance from the light source _. Therefore, in the second implementation, the 's-sinusoidal waveform y(x) is corrected to: 201022743 7=less 3〇): 丨/min 丨0)>-preparation yi{x) <~ The width of the micro-groove 120 is corrected as: a(x) fF=W3w=|^~Wi(x)+i>5 〇» if the function a(x) is incremented so that the width of the micro-groove 220 is along The direction of extension is increasing

Similarly, the 'second sinusoidal waveform Z is corrected to: a(x),,, , Z = z3(x) = |~ziW + ^ ^ zx{x)>-b ί 0 » if Z,{x)&lt ;-b where 'C value is corrected to a function c(x) increasing with x, such that the width of the micro-groove 22〇 is incremented along the extension direction X. The width and depth of the micro-grooves 220 are incrementally changed along the extending direction X, so that the farther away from the light-incident surface 213 and the light source 900 on the first plane 211, the proportion of the micro-grooves on the first plane 211 is relatively high. The ratio at which the light is incident on the microchannel 22 and is refracted.

When the value of a is corrected to be a practical application, the light source 900 is disposed on one side of the light incident surface 213, and the light is projected from the light incident surface 213 into the light transmitting layer 210. The first plane 211 is close to the light incident surface 213, and the light intensity is relatively high, and the light intensity is relatively low away from the light incident surface 213. The proportion of the micro-grooves 220 in the first plane 2Π increases with the distance from the light-incident surface 213, so that the proportion of the light rays refracted by the micro-trench 220 near the light-incident surface 213 is relatively low, and is far away. The proportion of the smooth surface 213 that is refracted by the micro-grooves 220 is relatively high, thereby adjusting the intensity of the light leaving the first plane 211, so that the brightness of the first plane 2Π is more uniform. 201022743 Referring to FIGS. 10-13, a light guide plate 300 according to a third embodiment of the present invention includes a light transmissive layer 310 and a plurality of microchannels 32. In the first embodiment and the second embodiment, the micro-grooves 12G, 220 are continuously disposed along the extending direction of the third embodiment in the third embodiment, and at least a portion of the micro-grooves 320 are intermittently It is disposed along its corresponding extension direction X, and the width and depth of each micro-groove 32〇 are incrementally changed along the extending direction X. In the extension direction x, the micro-groove is close to the portion of the light-incident surface 313. The longer the discontinuous section of the Le 1 320, the portion of the micro-groove 320 _ into the light-emitting surface 313, not the continuous section Short 'even changes to continuous settings. The variation of the discontinuous sections of the micro-grooves 320 changes the proportion of the micro-grooves 320 on the first plane 311, that is, the farther away from the light-incident surface 313 ′ the micro-grooves 320 occupy the first plane 311 The higher the ratio, the ratio of the refracted light is refracted by the micro-grooves 320; the closer to the incident surface, the more the micro-grooves 32 〇 the discontinuous sections, the micro-grooves 320 occupying the first plane 311 The lower the ratio. The proportion of the light emitted by the light source _ being refracted by the groove 32Q near the entrance surface 3U is relatively low, and the ratio of the refracted light passing through the micro-groove 32 远离 away from the incident light φ 311 is relatively high, thereby adjusting the light by The intensity at which the first plane 311 leaves is such that the brightness exhibited by the first plane is more uniform. The discontinuous micro-grooves 32 降低 reduce the man-hours required to micro-engraving the micro-grooves 320. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view of a light guide plate according to the first embodiment of the present invention. Fig. 2 is a plan view showing a light guide plate according to the first embodiment of the present invention. - Fig. 3 is a cross-sectional view taken along line B-B in Fig. 1. Figure 4 is a cross-sectional view taken along line A-A in Fig. 1. Fig. 5 is a perspective view showing a light guide plate of different ratios in the first embodiment of the present invention. Fig. 6 is a perspective view of the light guide plate in the second embodiment of the present invention. 12 201022743 FIG. 7 is a plan view of a light guide plate in a second embodiment of the present invention. Figure 8 is a cross-sectional view taken along line D-D in Figure 7. Figure 9 is a cross-sectional view taken along line C-C in Figure 7. Figure 10 is a perspective view of a light guide plate in a third embodiment of the present invention. Figure 11 is a plan view of a light guide plate in a third embodiment of the present invention. Fig. 12 is a sectional view taken along line F-F in Fig. 11. Figure 13 is a cross-sectional view taken along line E-E in Figure 11. [Main component symbol description] 100 light guide plate 110 light transmissive layer 111 first plane 112 second plane 113 light incident surface 120 micro trench 130 spacer plane 200 light guide plate 210 light transmissive layer 211 first plane 213 light entrance surface 220 micro groove Slot 300 Light guide plate 310 Light transmissive layer 311 First plane 13 201022743 313 Light incident surface 320 Micro groove 900 Light source

Claims (1)

201022743 X. Patent application scope: - Kind of light guide plate '(4) Guide - Light source of the squash light plate contains · · A light transmissive layer having a human face, a 1-plane and a second plane, wherein the light source is disposed at a gamma of the light incident surface, a Η兮 _ w and a third plane are connected to the light incident surface and opposite to the second plane; and a plurality of micro trenches are disposed on the first plane, each of the micro The grooves respectively extend along the extending direction of the M-edge of each of the micro-edges of the towel to the extending direction, and have a sinusoidal waveform along the extending direction, and the depth variation of each of the micro-ridings is in the extending direction. Two sinusoidal waveforms. 2. The light guide plate of claim 2, wherein the peak of each of the ridge depths is between 1 and 50 microns. 3. The light guide plate of claim i, wherein the function of the first sinusoidal waveform is: /X, 2ηπ b+ — 2 Where a is the amplitude of the first sinusoidal waveform; 11 is the period of the width and depth of each of the micro-grooves; Ρ is the initial phase; and b is a constant. 4. The light guide plate of claimant, wherein the function of the second sinusoidal waveform is X Jinn 22(^) = csir where c is the amplitude of the second sinusoidal waveform; 15 201022743 η is the micro-groove Width and depth change period; Ρ is the initial phase; and d is a constant. 5. The light guide plate of claim 3, wherein the width and depth variation period of each of the micro grooves are between 3 and 5 microns. 6. The light guide plate of claim 1, wherein each of the micro grooves has a width ranging from +/- 3 to 500 microns. 7. The light guide of claim 1, wherein each of the microchannels has a depth ranging from 3 to 500 microns. 8. The light guide plate of claim 1, wherein at least one of the microchannels is continuously disposed along a corresponding extension direction thereof. 9. The light guide plate of claim 3, wherein at least the microchannels are intermittently disposed along their corresponding extension directions. The light guide plate according to the application of the patent specification, wherein the light guide plate further comprises at least a job plane located between the adjacent two micro grooves. 11. The light guide plate of claim 1Q, wherein the width of each of the separation planes is between 3 and 500 microns. The light guide plate of the first aspect of the invention, wherein the ratio of the projected area of the micro-grooves and the spaced planes to the first plane ranges from 1/2 〇 to 2 〇. Keep away from the entrance. 13. The light guide plate according to claim 1, wherein each of the extending directions is 16 201022743. 14. The light guide plate of claim 13, wherein the peak of each of the microgroove depths increases with distance from the light source. 15. The light guide plate of claim 1, wherein the first sinusoidal function corresponding to the edge of each of the micro-grooves is the same phase. 16. The light guide plate of claim 1, wherein the first sinusoidal function corresponding to the edges of two adjacent microchannels is different in phase. The light guide plate of claim 1, wherein the second sinusoidal function corresponding to the depth of the bottom portions of the adjacent two micro-grooves is different. The light guide plate of claim 4, wherein the peak of the ___ is incremented in the extending direction, and the valley of the second sinusoidal waveform is increased in the extending direction. 19. Please refer to the light guide plate described in Patent No. 18, wherein the function of the first-view is: Y3(x)^ <χ) ., b ,~j~ydx)+~, if γι{χ)>Λ where a is a function that increases with the amount of the application; ^i(^) = sinf —; 2 η π 1 η is the width of each of the micro-grooves; ρ is the initial phase; and b is the constant. 17 201022743 2〇. For example, the approximation axis 18_ gamma, fine 帛: the function of the positive money shape Z3 (J〇~^(x, + b, if Zl(x)>-b 〇5 jf Zi(x) <-0 where ' zi (x) = sin 2ηπ + household c is - a function of increasing in the direction of extension; ❹ η is the period of width and depth of each micro-groove; Ρ is the initial phase; and b is one The light guide plate of claim 2, wherein at least a portion of each of the micro-grooves is intermittently disposed along the corresponding extending direction thereof. 22. As claimed in claim 21 In the light guide plate, the length of the discontinuous section of the microchannel adjacent to the light incident surface in the extending direction is greater than the length of the discontinuous section away from the light incident surface.