CN101363936A - Laser apparatus for patterning at light guide plate of back light unit and method for forming patterns using thereof - Google Patents

Laser apparatus for patterning at light guide plate of back light unit and method for forming patterns using thereof Download PDF

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Publication number
CN101363936A
CN101363936A CNA200810088268XA CN200810088268A CN101363936A CN 101363936 A CN101363936 A CN 101363936A CN A200810088268X A CNA200810088268X A CN A200810088268XA CN 200810088268 A CN200810088268 A CN 200810088268A CN 101363936 A CN101363936 A CN 101363936A
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mentioned
laser
axis
guide plate
light guide
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申景湜
金相佑
申英一
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Visiontech Co Ltd
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Visiontech Co Ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133524—Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
    • G02B6/0061—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide to provide homogeneous light output intensity
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133509—Filters, e.g. light shielding masks
    • G02F1/133514—Colour filters
    • G02F1/133516—Methods for their manufacture, e.g. printing, electro-deposition or photolithography
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Laser Beam Processing (AREA)
  • Planar Illumination Modules (AREA)

Abstract

The invention relates to a laser apparatus for patterning at light guide plate of back light unit and method for forming patterns at light guide plate of the back light unit using thereof, the laser apparatus comprises an output section emitting laser according to output signal oscillation, and forming patterns on plane light guide plate composed of X axis and Y axis, wherein the position equipped with light source is taken as initial point of Y axis; an action section for moving the output section according to action signal; a control system for controlling the output section and the action section. The control system comprises a program section for executing program about action of the output section and laser output; a local bus line linking with the program to receive pattern data of each 1 line of X axis corresponding with special Y coordinate of the light guide board to process; the action control section controlling action with data received from the local bus line. Wherein the action control and output control section are loaded on a local bus line for real-time control, referred patterning method herein employs the laser apparatus.

Description

Light guide plate of back light unit composition laser aid and utilize its patterning process
Technical field
The present invention relates to utilize laser aid to form the composition laser aid and the patterning process of figure on the light guide plate surface, relate in more detail and comprise the laser aid that to handle the control system of more signals by on a local bus, carrying operation control part and output control part together in a short period of time; And, the higher patterning process of qualification rate when relating to the light guide plate of utilizing this laser aid can produce high reliability more.
Background technology
Commercialization and practicability LCD the most widely in the flat display technology field, because itself can not be luminous, therefore the light-emitting device of a kind of so-called back light unit (Back light unit) need be set, the performance of LCD not only depends on the characteristic of itself, also depends on the performance of above-mentioned back light unit to a great extent.
This back light unit is broadly divided into light guide plate, optical thin film, lamp assembly and mould bases (moldframe), and the LCD with structure like this can be divided into straight-down negative (direct light) and side-light type (edge light) according to the lamp position of back light unit.
Straight-down negative is the mode of evenly adjusting back directive liquid crystal panel from the light of light source by diffuser plate; Side-light type then is after utilizing light guide plate to reflect the light that is sent by the light guide plate side, with the mode of its directive liquid crystal panel.From the trend of state-of-the-art technology, along with the lightening trend of LCD (LCD) module, side-light type then is subjected to more favor.
In this side-light type back light unit, the lamp assembly is arranged on the side of light guide plate, and by being used for alight and forming with the lamp reflector plate that constitutes around the shape of lamp and will reflex to light guide plate by the light of lamp emission.
The back light unit that adopts side-light type preferably can be the even scattering of light, thereby realizes uniform brightness on light guide plate, therefore need form the figure of reservation shape in the one side of light guide plate.
Past mode of composition on light guide plate has mechanical method, photolithography method and the laser composition method of utilizing diamond to form V-groove (V-notch).
At first, utilize the mechanical cutting mode of diamond that following shortcoming is arranged: its speed is relatively slow, reduces productivity, because machined surface is coarse, and scattered light equably, the repeatability of in statu quo reproducing the figure form of expectation descends.
The photolithography rule utilize that mask pattern exposes, when using etching solution after the video picture because etching solution immerses between mask and the light guide plate, therefore forming meticulous figure has certain degree of difficulty.And when light guide plate is thin plate, exist the repeatable problem that descends, owing to use etching solution, cause environmental problem in addition.
Therefore, more and more generally use recently and utilize laser instrument to form the method for light guide plate figure.
But, when existing laser aid formation is applied to the light guide plate figure of back light unit, in the composition operation, use the laser output quantity in the same manner and same ground forms the degree of depth and the shape of indivedual figures in batch always, in contrast, only regulate the size of indivedual figures, X, the Y-axis spacing between indivedual figure, therefore, when regulating the y-axis shift position, the problem that produces the concealed wire of brightness decline in the big place of its variable quantity is arranged.
The figure of the graphics shape of the light guide plate that the laser patterning process that is usefulness is gone over shown in Figure 1 forms; Shown in Figure 2 is the figure of light guide plate composition system in the past.
As shown in Figure 1, figure on the light guide plate of backlight unit that is formed on side-light type in past, along with leaving light source is that the Y coordinate increases, brightness descends, therefore, in order to proofread and correct this phenomenon, it is with the X-axis length C of indivedual figures of increasing strip along with leaving light source, and dwindles X-axis spacing A between indivedual figures and the form of Y-axis spacing B forms.
Therefore, along with the changes in coordinates of X-axis and Y-axis, laser duty when focus also will change, and is core topic in the light guide plate composition and can embody this mode of composition reliably.
Fig. 2 be based on the light guide plate patterning apparatus 100 of existing laser mode ' synoptic diagram.
As mentioned above, based on the light guide plate patterning apparatus 100 of existing laser mode ' take corresponding to the variation of indivedual feature size of X-axis and Y-axis and change the mode of the laser dutycycle except that the laser output quantity.
As shown in Figure 2, described device comprises: operating member 20 ' and, constitute by servomotor and servo-driver etc., so that on the plane of the light guide plate that constitutes by X-axis, Y-axis, move according to actuating signal; Efferent 30 ', by operating member 20 ' driving move, and output laser; Control system 10 ', control action portion 20 ' and efferent 30 '.
Here, control system 10 ' comprising: storage about the action of efferent and the program division 1 of laser written-out program '; Control action portion 20 ' operation control part 3 '; Control efferent 30 ' output control part 4 '; Local bus 2 ', carry operation control part 3 ' and input and output terminal 6 ', move control signal with output control part 4 ' is connected to operation control part 3 ' transmission, to output control part 4 ' transmission laser output signal; Output change control part 5 ', change signal with output control part 4 ' and local bus 2 ' is connected to local bus 2 ' transmission, so that change laser duty focus when according to the variation of Y-axis positional value.
Here, except that output control part 4 ' other structure be installed in the inside of computer installation jointly, output control part 4 ' then utilize other external device (ED) to constitute only.Therefore, can not with a local bus 2 ' while control action control part 3 ' and output control part 4 ', need be provided for controlling output control part 4 ' other output change control part 5 '.
Above-mentioned control system 10 ' action follow following mode: output changes control part 5 ' affirmations Y-axis positional value from output control part 4 ' feedback in composition is operated, if become the change starting point of Y-axis coordinate, then to local bus 2 ' transmission signal, so that the laser dutycycle is variable, above-mentioned local bus 2 ' by input and output terminal 6 ' to the output signal of output control part 4 ' transmissions change.
But, during according to the control mode in this past, in order to make the laser change in duty cycle, need be provided with other " output changes control part " 5 ', and to carry out by output and change control part 5 ' and through local bus 2 ' make " the output change procedure " of output control part 4 ' reception according to the Y-axis changes in coordinates, relevant signal with reformed laser dutycycle, so till the laser that vibrates, can produce the processing time delay is efferent motion " stand-down ".To being described as follows of this.
Shown in Fig. 3 a the figure of mobile route that is used for the efferent of integrated operation; Fig. 3 b is the curve map that shows the efferent translational speed that moves along the X-axis line corresponding with specific Y coordinate on the light guide plate plane on schedule.
Shown in Fig. 3 a, based on efferent 30 ' composition operate following execution: the top portion that begins to form light guide plate is the graph line of the X-axis of Y coordinate figure minimum, to positive dirction and carry out in the other direction jagged motion, be to form figure till the place of Y coordinate figure maximum to the lowest end of light guide plate.
Shown in Fig. 3 b, efferent is made of following interval at the period of change of the translational speed on the X-axis line corresponding with the Y-axis preferred coordinate: acceleration area t0-t1 that device is accelerated, the interval t1-t2 of stabilization stable under the uniform motion, based on laser output realize composition work at the uniform velocity interval t2-t3, efferent 30 ' deceleration before become stable under the uniform motion the interval t3-t4 of opposite direction stabilization, t4-t5 between deceleration area that efferent slows down.
Here, need to be provided with the positive dirction and the interval t1-t2 of opposite direction stabilization and the t3-t4 that carry out uniform motion, be because in case begin to form figure from efferent 30 ' vibrate laser, then need the laser of certain output quantity to be applied on the light guide plate surface, before the efferent 30 ' laser that vibrates, need to guarantee in advance to carry out the interval of uniform motion.The interval t1-t2 of this stabilization is shown in circular arc in Fig. 3 b as amplification in, efferent 30 ' irregular translational speed converge to the speed of certain uniform motion.
And, use existing control system 10 shown in Figure 2 ' situation under, for next line is processed, the interval t6-t8 of acceleration area and stabilization can not follow t4-t5 between above-mentioned deceleration area and carry out in the other direction, produces t5-t6 stand-down based on above-mentioned " output change procedure ".
Above-mentioned " stand-down " t5-t6 can not take place when changing the few small-sized liquid crystal display of the frequency of laser dutycycle and amplitude of variation thereof with light guide plate by each line making, but when making the light guide plate of the large-scale liquid crystal indicator that needs more laser change in duty cycle, if the control system 10 in above-mentioned past of use ', will take place inevitably.
In general, the time about the about 60ms of acceleration area consumption, the interval time that consumes about about 10ms of stabilization.But when the control method of using based on the system in above-mentioned past, the about 100ms of output change procedure consumption is to several seconds, so need above stand-down of 30ms at least.
Another reason that above-mentioned output change procedure is delayed is, initial stage is excessive by the cad data capacity of the figure of user's design, no matter use the how high local bus of processing speed, during the execution composition, carry out data ordering work, thereby read value, can only expend time in 1 line data of specific Y coordinate.
Summary of the invention
The present invention makes in order to address the above problem, the object of the present invention is to provide a kind of light guide plate of back light unit composition laser aid, it can make from sidelight source figure more at a distance has the dark more degree of depth, thereby described light guide plate is compared with the product under the existing unified mode of composition, can be transmitted more light.
In addition, the object of the present invention is to provide a kind of light guide plate of back light unit composition laser aid, change the laser dutycycle that comprises the laser output quantity and change the non-at the uniform velocity processing of focus by carrying out according to distance with light source, make light reflection minimized near the light source place, can be with least disadvantage to transmitting light from light source part far away.
In addition, the object of the present invention is to provide a kind of light guide plate of back light unit composition laser aid, carry operation control part and output control part together on the bus at all one, thereby under the condition that other output variation control part is not set, also can handle laser output change procedure rapidly.
In addition, the object of the present invention is to provide a kind of light guide plate of back light unit composition laser aid, in the data input step, carry out alignment step in advance, so that control efferent and the stand-down of not moving in real time, during the operation of efferent execution composition, local bus is handled after reading data about a specific line by the first-in first-out mode, thereby can realize composition rapidly.
The light guide plate of back light unit composition laser aid of the present invention that is used to solve above-mentioned problem comprises: efferent, according to the output signal laser that vibrates, be to form figure on the light guide plate Y-axis initial point, constitute a plane by X-axis and Y-axis with the position that is provided with light source; Operating member moves above-mentioned efferent according to actuating signal; Control system is controlled above-mentioned efferent and operating member, and above-mentioned control system comprises: program division, carry out program about the action and the laser output of above-mentioned efferent; Local bus, portion is connected with said procedure, and the graph data of reception each the X-axis line corresponding with specific Y coordinate on the light guide plate and handling; Operation control part is utilized from the data of above-mentioned local bus reception and is controlled above-mentioned operating member; And output control part, utilize the above-mentioned efferent of Data Control that receives from above-mentioned local bus.Above-mentioned operation control part and above-mentioned output control part are loaded on the above-mentioned local bus, and accept control in real time.
Above-mentioned local bus is pci bus preferably, helps like this providing effectively having compatible system.
In addition, light guide plate of back light unit patterning process of the present invention, utilize laser aid, be to form figure on the light guide plate Y-axis initial point, be made of a plane X-axis and Y-axis with the position that is provided with light source, this laser aid comprises according to output signal and vibrates laser and form the efferent of figure on light guide plate; With the operating member that moves above-mentioned efferent according to actuating signal.This method comprises: the data operation step, and discern and read after the graph data by user design and storage, arrange according to sequence of operation, and above-mentioned graph data is converted to laser output signal is pulse signal; Pattern step, according to the first-in first-out mode, receive in the above-mentioned pulse signal process data of each the X-axis line corresponding successively with Y-axis particular value in the light guide plate, and when above-mentioned operating member and above-mentioned output supplementary biography send actuating signal and output signal to move above-mentioned efferent, each X-axis line is regulated laser duty focus when, and form figure successively to the bottom from the upper end of light guide plate.
Here, above-mentioned pattern step can comprise: first signal transmission steps receives the process data of an X-axis line corresponding with specific Y-axis value on the light guide plate, and transmits signal to above-mentioned operating member and above-mentioned efferent; The output preparation process accelerates to above-mentioned efferent till the X-direction uniform motion, the duty of regulating laser when focus to prepare laser generation; Laser output step carries out under the state of uniform motion above-mentioned efferent at above-mentioned operating member, and above-mentioned efferent vibrates laser and forms the figure of an above-mentioned X-axis line; The secondary signal transfer step stops laser generation, Yi Bian and above-mentioned efferent is decelerated to stop to move horizontally, Yi Bian transmit the process data of an X-axis line corresponding to above-mentioned operating member and above-mentioned efferent with next Y-axis particular value; And the moving step of y-axis shift, make above-mentioned efferent move to the starting position of an X-axis line corresponding with above-mentioned next Y-axis particular value.Above-mentioned steps helps realizing rapid and high efficiency control.
Here, above-mentioned pattern step can also comprise the curve interpolating step, after above-mentioned laser output step, to proofreading and correct, thereby make the outline line of the figure change in depth that the variation according to the Y-axis coordinate forms constitute level and smooth curve about the laser dutycycle of the processing of an X-axis line corresponding or at least one in the focus value with next Y-axis particular value.
In order to form the figure depth profile line of smooth curve shape, in the above-mentioned curve interpolating step, some at least in above-mentioned laser dutycycle or the focus value preferably by B-SPL interpolating method control.
In addition, in order not control moving of efferent effectively with having stand-down, the translational speed period of change of above-mentioned efferent on an X-axis line corresponding with above-mentioned Y-axis particular value preferably includes the acceleration area that device is accelerated, the stabilization interval that under uniform motion, becomes stable, execution is based on the at the uniform velocity interval of the composition work of laser output, the opposite direction stabilization interval that is stabilized under the uniform motion before efferent slows down, between the deceleration area that efferent is decelerated, and above-mentioned first signal transmission steps and output preparation process are carried out in above-mentioned acceleration area and aforementioned stable interval, above-mentioned laser output step is carried out at the uniform velocity interval above-mentioned, the moving step of above-mentioned secondary signal transfer step and y-axis shift between above-mentioned opposite direction stabilization interval and deceleration area in execution.
In addition, the moving step of above-mentioned first signal transmission steps and output preparation process or above-mentioned second transfer step and y-axis shift is preferably carried out in 100ns respectively.
As above observation, according to light guide plate of back light unit composition laser aid of the present invention, figure formed along with leaving the sidelight source deepen the figure degree of depth, compare with existing unified mode of composition, can transmit a large amount of light.
In addition, change the laser dutycycle that comprises the laser output quantity and change the non-homogeneous processing of focus by carrying out according to distance with light source, feasible from light source light reflection minimized the most nearby, simultaneously can be with least disadvantage to from light source part transmission light far away.
In addition, carry operation control part and output control part together on the bus at all, change control part, also can handle laser output change procedure rapidly thereby need not to be provided with other output one.
In addition, according to light guide plate of back light unit composition laser aid of the present invention, in order there not to be motion ground stand-down control efferent in real time, carry out alignment step in advance at the data input step, and during the operation of efferent execution composition, local bus reads about the data of a specific line by the first-in first-out mode and handles, thereby can realize composition rapidly.
Description of drawings
Fig. 1 is the graphics shape synoptic diagram with the light guide plate of the laser patterning process formation in past;
Fig. 2 is the synoptic diagram of light guide plate composition laser aid in the past;
Fig. 3 a is the mobile route synoptic diagram of the efferent of laser aid in the past;
Fig. 3 b is the curve map that shows the translational speed of efferent in the past on schedule;
Fig. 4 a is the sectional view that utilizes the light guide plate of light guide plate of back light unit patterning process making of the present invention;
Fig. 4 b is the curve of the outline line of the expression figure degree of depth of utilizing the light guide plate that light guide plate of back light unit patterning process of the present invention makes;
Fig. 5 is the synoptic diagram of light guide plate of back light unit composition laser aid of the present invention;
Fig. 6 is the curve map that shows on schedule based on the translational speed of the efferent of light guide plate of back light unit patterning process of the present invention;
Fig. 7 is the precedence diagram of light guide plate of back light unit patterning process of the present invention;
Fig. 8 a is that expression increases along with the Y-axis coordinate and utilizes gradual curve interpolating method to change the result's of laser dutycycle curve map;
Fig. 8 b is that expression increases along with the Y-axis coordinate and utilizes the B batten (B-Spline) curve interpolating method changes the result's of laser dutycycle curve map;
Fig. 9 a is that expression increases along with the Y-axis coordinate and utilizes gradual curve interpolating method to change the result's of laser spot value curve map;
Fig. 9 b is that expression increases along with the Y-axis coordinate and utilizes the B-spline curves interpolating method to change the result's of laser spot value curve map.
Embodiment
Below, the light guide plate of back light unit composition laser aid that present invention will be described in detail with reference to the accompanying and utilize its light guide plate of back light unit patterning process.
Fig. 4 a is the sectional view that utilizes the light guide plate of light guide plate of back light unit patterning process making of the present invention; Fig. 4 b is the curve that illustrates based on the outline line of the figure degree of depth of this method.
Shown in Fig. 4 a, the light guide plate of utilizing light guide plate of back light unit patterning process of the present invention to make is characterised in that, it is that the Y coordinate increases and the outline line of variation that the degree of depth of formed figure has along with leaving light source, makes thus to have identical brightness after the light of light source is reflected.
Shown in Fig. 4 b, the light guide plate of above-mentioned Fig. 4 a is provided with under the situation of light source at the Y-axis two ends of light guide plate, the outline line of the figure degree of depth T that section by the light guide plate figure shows (profile, in Fig. 4 b by " A " expression) along with the Y coordinate increases, should have parabolic shape on the whole.
Here, be formed on identical laser dutycycle and the focus of graphical application on 1 line of X-axis, so the X-axis spacing that is formed between the width, amplitude, indivedual figure of a plurality of indivedual figures on the above-mentioned same line is identical with identical Y coordinate.
The figure that is formed on the above-mentioned light guide plate will make the figure degree of depth difference of each X-axis line, so is difficult to utilize the job operation manufacturing of each line being used the existing laser aid of uniform laser output quantity.
That is, not only need to change the laser dutycycle, change thus outside the size of indivedual figures on two dimensional surface, also need to change the figure degree of depth that on each line, forms respectively, therefore also need to change the laser output quantity by the paragraph of pulse signal.Owing to this reason, laser instrument needs the built-in control system that can handle huge data volume simultaneously.
In addition, if above-mentioned parabolic outlines line forms with achieving one's goal, can't be delivered to center Screen and lose from the light of light source, the brightness of center Screen will be lower than the brightness of edge part.Therefore in order to prevent the luminance loss of described central portion, need respectively each graph line is suitably regulated the laser duty focus when that comprises the laser output quantity.
Fig. 5 is the figure that the light guide plate of back light unit composition laser aid of the present invention that is used to solve above-mentioned problem is shown.
As shown in Figure 5, light guide plate of back light unit composition laser aid 100 of the present invention comprises: the control system 10 of control action portion 20 and efferent 30; According to the output signal laser that vibrates, on light guide plate, form the efferent 30 of figure; And preferably constitute by servomotor and servo-driver, come the operating member 20 of mobile efferent 30 according to actuating signal.
In addition, control system 10 of the present invention comprises: program division 1, carry out program about the action and the laser output of efferent; Local bus 2, connect with program division 1 and receive with the corresponding X-axis of the specific Y coordinate of light guide plate on the graph data of each line handle; Operation control part 3 is utilized from the data of local bus 2 receptions and is come control action portion 20; And output control part 4, utilize the Data Control efferent 30 that receives from local bus 2.
Program division 1 is carried out various control datas and program, arranges CAD graph data by user's design according to sequence of operation, carries out and converts above-mentioned CAD graph data to function that laser output signal is a pulse signal, is made of the CPU of computing machine.
Operation control part 3 and output control part 4 preferably carry on the same local bus 2 that is made of pci bus (peripheral component interconnect bus) with input and output terminal 5, control in real time.Local bus 2 utilize pci bus be because, pci bus as local bus 2 by commercialization, can guarantee compatibility, that is, under the diverse situation of CPU, have the character that the bridgt circuit corresponding with it just can be connected with any CPU as long as can guarantee.
As mentioned above, operation control part 3 and output control part 4 are equipped under the situation that constitutes control system 10 on the local bus 2, have the effect that the processing time when preventing that the prior art problems that illustrates previously from promptly controlling output and change postpones.
The technical characterictic that is described control system (10) is as follows: need in the technology the other output of configuration to change control part (5 ') in order to prevent over, thereby after the composition operation of finishing previous X-axis line, in order to carry out operation to back one X-axis line, execution is used to adjust at the laser duty that comprises the laser output quantity of back one X-axis line when during the output change procedure of focus, the problem that its processing time is delayed, the present invention has omitted output and has changed control part (5 '), and operation control part (3) and output control part (4) all are set, thereby realized the unified control system of handling the output signal variation in local bus (2) on same local bus (2).
By the light guide plate of back light unit pattern forming method of the present invention of following explanation, observe laser aid 100 and what kind of plays particularly be used for shortening processing speed with above-mentioned formation.
At first, have a look the period of change that utilizes light guide plate of back light unit pattern forming method of the present invention with reference to Fig. 6 at the translational speed of the efferent 30 of a line on the X-axis line.
Above-mentioned efferent 30 is t4-t5 between the translational speed period of change of X-axis comprises acceleration area t0-t1, the interval t1-t2 of stabilization that is becoming stable under the uniform motion that device is accelerated, output realizes the composition operation based on laser at the uniform velocity interval t2-t3, the opposite direction stabilization interval t3-t4 that becomes stable under the uniform motion before the deceleration of motion of efferent 30, deceleration area that efferent 30 is decelerated.
In addition, when the process operation finished at each X-axis line, efferent 30 is moving to y-axis shift, efferent 30 t4-t5 between the variation of the translational speed of the Y-axis deceleration area at an X-axis line upwards has acceleration area t0 '-t1 ' with interior, has t1 ' between deceleration area-t2 ' in the opposite direction processing interval t5-t6 that is used to carry out at the processing of next X-axis line.
Promptly, the motion of efferent 30 during slowing down on the X-axis, the beginning move to Y direction, efferent 30 be accelerated in order to carry out reciprocal X-axis tangential movement during, need to slow down and finish the Y-axis tangential movement, so that make efferent 30 be positioned at the processing starting position of next X-axis line.
In other words, need realize composition work in the positive dirction motion of efferent 30 and ground stand-down that does not have between the motion to move in the other direction.
In order successfully to carry out moving of above-mentioned efferent 30, need carry out control system 10 internally promptly read at the reformed laser duty of the figure of 1 line of next X-axis when focus value come the process of control action portion 20 and efferent 30 in real time.
Fig. 7 is the precedence diagram that light guide plate of back light unit patterning process of the present invention is shown.
Shown in Fig. 7 a, light guide plate of back light unit patterning process of the present invention comprises data operation step S10 and pattern step S20.
Wherein data operation step S10 carries out as follows: discern and read the graph data of storage by user's design from program division 1, according to the sequence of operation arrangement, it is pulse signal that above-mentioned graph data is converted to laser output signal.This data operation step be formal carry out pattern step S20 before, arrange and partition data by each graph line, with a kind of preliminary step of the overload load that prevents data.
Shown in Fig. 7 b, data operation step S10 carries out in program division 1, comprise program division 1 identification and read the CAD graph data of storage by user's design loading step S11, according to sequence of operation arrange above-mentioned graph data alignment step S12, and convert the above-mentioned graph data that is arranged to pulse signal switch process S13 that laser output signal is a pulse signal.
Alignment step S12 is a technical characterictic among the present invention, and this step is carried out as follows: will arrange each X-axis line data corresponding with specific Y coordinate in advance in order by loading the CAD graph data that step S10 reads, and cut apart the data of each line.
In view of the above, in the pattern step S20 of subsequent step, only need according to by first-in first-out mode (FirstInFirst Out, FIFO) order of Pai Lieing reads respectively and carries out composition operation at the data of each line and get final product, therefore can prevent under the uniform data load mode in the past the data capacity excessive phenomenon of loading.
At this, in the way of carrying out alignment step S12, in loading step S11, read under the situation of wrong cad data, it can be turned back to again and load step S11.
Pulse signal switch process S13 uses, the CAD graph data that is loaded is converted to the step of pulse data for reality carries out composition on light guide plate.In this process, proofread and correct it error (offset) back that program division 1 calculates between above-mentioned graph data and the pulse data signal, and the user can import the new numerical value that is fit to condition of work.
The purpose that the user imports new numerical value is, is the reference mark by input based on the laser dutycycle of the variation of Y-axis coordinate figure or at least one data in the focus value, and cooperates the input value laser that vibrates to regulate the degree of depth that is formed on the figure on the above-mentioned light guide plate.
Pattern step S20 carries out as follows: local bus 2 is according to the first-in first-out mode, receive the process data of each corresponding X-axis line of Y-axis preferred coordinate in the above-mentioned pulse signal successively with in the light guide plate, to operation control part 3 and output control part 4 transmits actuating signal respectively and output signal is come mobile efferent 30, efferent 30 is regulated the laser duty focus when that comprises the laser output quantity, forms figure successively to the lower end from the upper end of light guide plate.
Above-mentioned pattern step S20 carries out as follows: when adjusting comprises the laser dutycycle of output quantity of the laser that vibrates, change the laser dutycycle according to the Y-axis coordinate, thereby the degree of depth of the figure of formation is increased and different along with the coordinate of Y-axis.
Shown in Fig. 7 c, pattern step 20 also comprises the first signal transmission steps S21, output preparation process S22, laser output step S23, curve interpolating step S24, secondary signal transfer step S25, reaches the moving step S26 of y-axis shift.
The first signal transmission steps S21 carries out in the following manner: the process data that receives an X-axis line corresponding with the specific Y coordinate of light guide plate by local bus 2 from program division 1, promptly, for example under the situation of initialization, receive be arranged in advance and prepare, at the corresponding X-axis of minimum Y coordinate figure on the process data of the 1st line, and transmit signals to operating member 20 and efferent 30 by operation control part 3 and output control part 4.
As mentioned above, in the first signal transmission steps S21, local bus 2 is carried out by read 1 line data by the first-in first-out mode from the data of each line of being arranged in advance at every turn from the mode that program division 1 receives 1 line data of X-axis.
For example, when the composition operation of carrying out initial line, local bus 2 receives the laser dutycycle that comprises the laser output quantity at initial line, focus value etc. from program division 1.
Output preparation process S22 carries out as follows: operation control part 3 makes efferent 30 accelerate to the interval t2 of stabilization so that it moves with uniform velocity along X-direction via acceleration area t1; Output control part 4 is regulated the laser duty focus etc. when that comprises the laser output quantity, to prepare laser output.
Here, the first signal transmission steps S21 and output preparation process S22 carry out simultaneously, carry out in acceleration area and the interval t0-t2 of stabilization.More preferably carry out in acceleration area t0-t1, its required time only is in the 100ns, preferably carries out in tens ns.
So only consume little time and be because, as mentioned above, in the formation of system 100, on a local bus 2, carry operation control part 3 and output control part 4 together, and, in the first signal transmission steps S21, transmit 1 line data according to the first-in first-out mode at every turn.
Laser output step S23 enters under the state of uniform motion efferent 30 at operating member 20 and carries out, and is efferent 30 output laser and form the step of the figure of a line on the above-mentioned X-axis.That is, in fact, go out laser in the surface oscillation of light guide plate and form the step of figure.
Curve interpolating step S24 finishes after the laser output step S23,4 pairs of efferents are proofreaied and correct about the laser dutycycle of an X-axis line corresponding with next Y-axis particular value or in the focus value at least one and are carried out interpolation, make the outline line of the figure change in depth that variation according to the Y-axis coordinate forms form the step of level and smooth curve, below it is described in detail.
Secondary signal transfer step S25 is the step that transmits the processing desired data of an X-axis line corresponding with next Y-axis particular value to operating member 20 and efferent 30.
The moving step S26 of y-axis shift carries out the starting position that efferent moves to an X-axis line corresponding with above-mentioned next Y-axis particular value by operating member 20.Here, the motion of efferent 30 possesses t1 '-t2 ' between acceleration area t0 '-t1 ' and deceleration area as described above in y-axis shift is moving.
The moving step S26 of secondary signal transfer step S25 and y-axis shift carries out simultaneously, the X-axis of efferent 30 moves between opposite direction stabilization interval and deceleration area and carries out in t3-t5, more preferably t4-t5 is with interior execution between deceleration area, and its required time only is in the 100ns, preferably carries out in tens ns.
Like this, in internal control system 10, carry out promptly read at the figure of a line of next X-axis, reformed laser duty focus value data when, thereby the process of real-time control action portion 20 and efferent 30, and then as shown in Figure 6, be implemented in the positive dirction motion of efferent 30 and the composition operation of the stand-down of not moving between the motion in the other direction at 1 line.
The above-mentioned first signal transmission steps S21 repeats to the moving step S26 of y-axis shift and forms last graph line on the Y-axis, when carrying out new composition operation, comes back to data operation step S10, starts anew to carry out the composition operation.
The depth profile line of the figure of Xing Chenging constitutes tracing pattern like this, above-mentioned tracing pattern is carried out level and smooth control, then can form more accurate figure, by forming accurate figure, thereby the light of scattering can demonstrate uniform brightness on the figure of light guide plate.
Therefore, need preparation to make the depth profile line of above-mentioned figure form the curve interpolating method that is used for the control chart deltoid of level and smooth curve.That carry out this function is the curve interpolating step S24 that carries out after above-mentioned laser output step S23.
Curve interpolating step 24 will be carried out by the laser dutycycle being controlled to be change by each line, and transmitting in fact is output control part 4 by the control signal of interpolation.The pulse signal of laser dutycycle that output control part 4 will be set by above-mentioned data operation step S10 or focus value etc. transmits the new control signal that is similar to above-mentioned reference mark as the reference mark to efferent 30, according to the above-mentioned pulse signal laser that vibrates.
After all, curve interpolating step S24 is that the outline line of figure change in depth that the variation according to the Y-axis coordinate is formed carries out interpolation and makes it form the step of level and smooth curve.
At first, in the interpolating method of above-mentioned curve, observe the situation of using gradual curve interpolating method.According to above-mentioned gradual method of changing, if L1 is first Y coordinate figure that will change of efferent 30, if L2 is second Y coordinate figure that will change of efferent 30, if La is the laser output quantity in the L1 change in location, if Lb is the laser dutycycle in the L2 change in location, if R1 is during from the rate of change of the laser output quantity of L1 when move the L2 position, the rate of change of above-mentioned laser output quantity is derived from mathematical expression R1=(La-Lb)/(L2-L1), if A1 is the Y-axis coordinate of current above-mentioned efferent, if the above-mentioned laser output quantity that S during for the laser output quantity that will use, is applied on the X-axis line corresponding with particular value on the Y-axis is derived by mathematical expression S=R1*A1.
Fig. 8 a and Fig. 9 a are illustrated respectively in the result that changes with the increase of Y-axis coordinate figure of focus (added value of lens barrel) when of described laser duty under the gradual curve interpolating method.
Shown in Fig. 8 a and Fig. 9 a, if use above-mentioned gradual curve interpolating method, can't connect into level and smooth curve between the point, might on figure, form separatrix or striped etc. behind the composition.Therefore, for preventing that this situation is necessary curve controlled is become to have the smooth connection shape.
Therefore the present invention uses B batten (B-Spline) interpolating method with as above-mentioned curve interpolating method.
Described B-spline curves interpolating method can be applicable to following situation: if determine a plurality of reference mark Po, P on the curve in advance 1, P 2... the coordinate figure of the .Pn laser dutycycle of each line in the figure (promptly to), output control part (4) just can instruct described laser dutycycle when each line is carried out composition operation, thereby compensation connects Po, P 1, P 2... the curve of .Pn has level and smooth connection shape.
The applied mathematical expression of above-mentioned B spline interpolation method is a formula general on general B-spline curves, in (d-1) order polynomial, when d during optional integer, is used for being similar to each the k time position vector P of (n+1) individual reference mark in 2≤d≤n+1 scope kB-spline curves can use following formulate.
P ( u ) = Σ k = 0 n P k N k , d ( u ) , u min ≤ u ≤ u max . 2 ≤ d ≤ n + 1
Wherein, u is for being defined in preset range u Min≤ u≤u MaxInterior parameter, N K, d(u) be spline base function, define with following recurrence formula (Recurrence Relation).
N k , 1 = 1 , if u k ≤ u ≤ u k . ; 0 . otherwise
N k , d ( u ) = u - u k u k + d - 1 - u k N k , d - 1 ( u ) + u k + d - u u k + d - u k + 1 N k + 1 , d - 1 ( u )
Wherein, u kExpression node (knot), u 0, u 2... u mExpression is the node in n+d+1 interval when m=n+d, and the set of this node is with regard to configuration node vector (knot vector).
Above-mentioned spline base function N K, d(u) be d function in interval the reference mark in being defined in from k to the k+d interval, it can carry out the part to the curve that exerts an influence and control in an above-mentioned d interval.
If formed knot vector inhomogeneous (non-uniform) can be used based on by NURBS (Non-Uniform Rational B-Spline: the interpolating method of Ding Yi mathematical expression non-uniform rational B-spline).
That is, when given n+1 reference mark, above-mentioned mathematical expression can be expressed as follows:
P ( u ) = Σ k = 0 n w k P k N k , d ( u ) Σ k = 0 n w k N k , d ( u )
ω wherein kBe the weights at k reference mark, the shape of curve just changes according to above-mentioned weights and spline base function.
Application based on the B-spline curves interpolating method of above-mentioned several mathematical expressions control the laser duty when the result of focus respectively shown in Fig. 8 b and Fig. 9 b.
Shown in yellow solid line part among Fig. 8 b and Fig. 9 b, if utilize above-mentioned B-spline curves interpolating method, connect on the curve at each reference mark and jump can not occur, therefore can form more level and smooth figure depth profile line, and then can carry out more that refined control prevents to occur on the figure separatrix.
Top reference preferred embodiment of the present invention has been described in detail.But claim scope of the present invention is not limited to the foregoing description, and can have different embodiment in spiritual scope of the present invention.Under the prerequisite that does not break away from spirit of the present invention, different modification that those skilled in the art can carry out and change all belong to interest field of the present invention.

Claims (8)

1, a kind of light guide plate of back light unit composition laser aid is characterized in that, comprises with the lower part:
Efferent according to the output signal laser that vibrates, is being to form figure on the light guide plate Y-axis initial point, be made of a plane X-axis and Y-axis with the position that is provided with light source;
Operating member moves above-mentioned efferent according to actuating signal;
Control system is controlled above-mentioned efferent and operating member, it is characterized in that, above-mentioned control system comprises:
Program division is carried out the program about the action and the laser output of above-mentioned efferent;
Local bus connects with said procedure portion and receives with the graph data of the corresponding X-axis line of the specific Y coordinate of light guide plate and handle;
Operation control part is utilized from the data of above-mentioned local bus reception and is controlled above-mentioned operating member;
Output control part utilizes the above-mentioned efferent of Data Control that receives from above-mentioned local bus.
Above-mentioned operation control part and above-mentioned output control part are loaded on the above-mentioned local bus and control in real time.
2, light guide plate of back light unit composition laser aid as claimed in claim 1 is characterized in that above-mentioned local bus is a pci bus.
3, a kind of light guide plate of back light unit patterning process, utilize laser aid, in the position that is provided with light source is to form figure on the light guide plate Y-axis initial point, be made of a plane X-axis and Y-axis, this laser aid comprises according to output signal and vibrates laser and form the efferent of figure and move the operating member of above-mentioned efferent according to actuating signal on light guide plate, it is characterized in that, comprising:
The data operation step is discerned and is read by user design and after the graph data of storage, arranges according to sequence of operation, and above-mentioned graph data is converted to laser output signal is pulse signal;
Pattern step, according to the first-in first-out mode, receive the process data in the above-mentioned pulse signal successively about each X-axis line corresponding with Y-axis particular value in the light guide plate, when above-mentioned operating member and above-mentioned output supplementary biography send actuating signal and output signal to move above-mentioned efferent, each X-axis line is regulated laser duty focus when, from the upper end of light guide plate to the bottom composition successively.
4, light guide plate of back light unit patterning process as claimed in claim 3 is characterized in that, above-mentioned pattern step further comprises:
First signal transmission steps receives the process data of an X-axis line corresponding with the particular value of light guide plate, transmits signal to above-mentioned operating member and above-mentioned efferent;
The output preparation process accelerates to above-mentioned efferent till the X-direction uniform motion, and the duty of adjusting laser is focus when, prepares laser generation;
Laser output step carries out under the state of uniform motion above-mentioned efferent at above-mentioned operating member, and above-mentioned efferent vibrates laser and forms the figure of an above-mentioned X-axis line;
The secondary signal transfer step stops laser generation, Yi Bian till above-mentioned efferent being decelerated to stop to move horizontally, Yi Bian transmit the process data of an X-axis line corresponding with next Y-axis particular value to above-mentioned operating member and above-mentioned efferent;
Y-axis shift moves step, makes above-mentioned efferent move to the starting position of an X-axis line corresponding with above-mentioned next Y-axis particular value.
5, light guide plate of back light unit patterning process as claimed in claim 4, it is characterized in that, above-mentioned pattern step also comprises the curve interpolating step, after above-mentioned laser output step, to proofreading and correct, thereby make the outline line of the figure change in depth that the variation according to the Y-axis coordinate forms form level and smooth curve about the laser dutycycle of the processing of an X-axis line corresponding or at least one in the focus value with next Y-axis particular value.
6, light guide plate of back light unit patterning process as claimed in claim 5 is characterized in that, in above-mentioned curve interpolating step, at least one in above-mentioned laser dutycycle or the focus value is by the control of B-spline curves interpolating method.
7, as any one the described light guide plate of back light unit patterning process in the claim 4 to 6, it is characterized in that, the period of change of the translational speed of the above-mentioned efferent on the X-axis line corresponding with above-mentioned Y-axis particular value comprises acceleration area that device is accelerated, in the stabilization interval that becomes stable under the uniform motion, carry out based on the composition work of laser output at the uniform velocity interval, finish becoming stable under the uniform motion before the deceleration of efferent opposite direction stabilization interval, between deceleration area that efferent is decelerated;
Above-mentioned first signal transmission steps and output preparation process are carried out in above-mentioned acceleration area and aforementioned stable interval, above-mentioned laser output step is carried out at the uniform velocity interval above-mentioned, the moving step of above-mentioned secondary signal transfer step and y-axis shift between above-mentioned opposite direction stabilization interval and deceleration area in execution.
8, light guide plate of back light unit patterning process as claimed in claim 7 is characterized in that, the moving step of above-mentioned first signal transmission steps and output preparation process or above-mentioned second transfer step and y-axis shift is carried out in 100ns respectively.
CNA200810088268XA 2007-08-07 2008-04-29 Laser apparatus for patterning at light guide plate of back light unit and method for forming patterns using thereof Pending CN101363936A (en)

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