TWI437338B - Method and system for repairing flat panel display - Google Patents

Description

Flat display display repair method and system

The invention is a repairing technique, in particular, a repairing method and system for a flat panel display.

The liquid crystal display is a non-active light-emitting component, and the color display must provide a light source through the backlight module, and the driving circuit and the liquid crystal control form a gray scale brightness display, and the red (R), green (G) and blue of the filter light are transmitted through the filter. The color (B) color layer gives each pixel a specific color, and the pixels of different colors form a color picture. If there is a flaw in the panel, the pixel in the display will not display the desired color correctly, and a bright spot or a dark dot will be formed. Especially the bright spot is particularly obvious for the display user, so the number of bright spots is also one of the panel rating elements.

In the conventional technology, for example, the method for repairing a liquid crystal display panel proposed by the Republic of China Publication No. 200827819 uses a first nanosecond laser to generate a gap crack in the filter, and a second femtosecond laser (450 nm, Above 10MHz) or Diode Laser, through the linear absorption, the filter of the existing gap is changed in physical properties to reduce the light transmittance of the bright spot. In addition, as disclosed in the Republic of China Publication No. 200829977, a method and apparatus for repairing a liquid crystal display panel using a CW or CW or Pulse laser having a wavelength of 400-490 nm or a femtosecond having a wavelength of >10 MHz and a wavelength of 450 nm is disclosed. The laser is repaired by the RGB linear absorption section, which needs to be processed by the crystal surface of the liquid crystal display. If it is repaired from the color filter surface, the polarizing film is easily destroyed. The laser 400 nm-490 nm band used in this technique has low R and G color resistivity and can process the appropriate energy on the bright spot photoresist.

In addition, as disclosed in WO 2008-156286, a repair method is disclosed in which a gap is formed between the photoresist material and the glass by laser irradiation, and the surrounding black matrix is melted by laser scanning. In the gap, the photoresist region having a bright spot is blackened. (not directly blackening the photoresist). A repair method is also disclosed in U.S. Patent No. 7,502,094, which is irradiated by a laser (Nd:YAG laser 380-740 nm, <55 Hz) in a reticle to cause the filter to face the substrate surface. Blackening (so that the light generated by the light source cannot pass through the filter), due to the diffusion zone generated during the irradiation process, it is necessary to process the three sets of different sizes of masks to repair the bright spots. In addition, a method and system for repairing a liquid crystal display is disclosed in US Pat. No. 7,636,148, which discloses three repair methods. The first one is to apply a repair film on the glass substrate under the panel. The repair film is processed by a laser (YAG, excimer, diode laser) at a position where there is a bright spot. The second is processed in black matrix. A third type of pattern spacer process covers the melted support onto a colored photoresist with bright spots. U.S. Patent No. 7,126,232 is also a repair mechanism for transferring a repair film to a defect location.

In addition, as disclosed in US Pat. No. 5,926,246, a repairing method is disclosed in which an alignment film in a liquid crystal panel is processed by laser, and a bright spot region is detected by a rotation direction of the polarizing film to perform a laser processing alignment film. The laser wavelength range is 200-450nm, which is mainly to prevent other areas from being damaged by the laser irradiation. The laser causes the liquid crystal to be arranged irregularly and reduces the light transmittance. The Republic of China new patent M381804 provides a repair device for a display containing a filter, comprising at least one laser source, at least two mirror groups, at least two lenses and at least one lens group control unit, which are selectively outputtable The laser light of different wavelengths is used to blacken the color points of different colors on the filter to complete the bright spot repair.

The invention provides a method and a system for repairing a flat display, which utilizes a femtosecond laser to focus on a light-transmitting substrate of a flat display, and performs a modification process on the light-transmitting substrate, which can be processed by a femtosecond laser. The substrate produces multiphoton nonlinear absorption, small heat affected zone and controlled processing depth, so it can directly repair the inside of the panel of the packaged flat display.

The invention provides a method and a system for repairing a flat panel display, which can repair a liquid crystal display panel that completes packaging, and focus femtosecond laser light on a light-transmitting substrate of a filter containing a polarizing film, and the filter is The light-transmissive substrate is modified and blackened to eliminate the bright spots of the display, so that the bright spots on the original formed panel become dark spots, and no damage is caused to other areas, thereby improving the quality and grade of the display product. In addition, since it is not harmful to other areas or components, such as a polarizing film, the time required for repair can be reduced.

In one embodiment, the present invention provides a flat panel display repairing method comprising the steps of: providing a flat panel display having a light transmissive substrate, the flat panel display having at least one bright spot; and providing a femtosecond laser Focusing on the light-transmitting substrate corresponding to the bright spot, the light-transmitting substrate corresponding to the bright spot is modified by nonlinear multi-photon absorption, and the bright spot is converted into a dark spot.

In another embodiment, the present invention provides a flat panel display repairing method comprising the following steps: a flat panel display repairing method comprising the steps of: providing a flat panel display having a liquid crystal module and filtering The film is disposed on the liquid crystal module, the liquid crystal module has a first light transmissive substrate, the filter has a second light transmissive substrate and a color photoresist layer, the flat display has at least a bright spot; and providing a femtosecond laser focusing illumination on the first light transmissive substrate or the second light transmissive substrate corresponding to the bright spot, so that the first light transmissive substrate or the second light transmissive substrate corresponding to the bright spot The nonlinear multiphoton absorption is generated and modified, and the bright spot is converted into a dark spot.

In another embodiment, the present invention further provides a flat panel display repairing system, comprising: a mobile platform; a flat panel display disposed on the mobile platform, the flat panel display having a light transmissive substrate, the plane The display has at least one bright spot; and a femtosecond laser source that provides a femtosecond laser to focus on the light-transmitting substrate corresponding to the bright spot, so that the light-transmitting substrate corresponding to the bright spot is nonlinearly generated The photon is absorbed and modified, and the bright spot is converted into a dark spot.

In order to enable the reviewing committee to have a further understanding and understanding of the features, objects and functions of the present invention, the related detailed structure of the device of the present invention and the concept of the design are explained below so that the reviewing committee can understand the present invention. The detailed description is as follows: Please refer to FIG. 1 , which is a schematic flowchart of an embodiment of a flat panel display repairing method of the present invention. The repair method 2 first provides a flat panel display in step 20. As shown in Figure 2, the figure is a schematic cross-sectional view of a flat panel display. The flat panel display of Figure 2 is a liquid crystal flat panel display. The flat panel display 3 has a liquid crystal module 30, a filter 31, and a backlight module 32. The liquid crystal module 30 has a first transparent substrate 300, and the material thereof can be transparent glass or polymer, such as plastic or the like. The first transparent substrate 300 has a thin film transistor layer 301 thereon. The thin film transistor layer 301 has a liquid crystal layer 302 having a support 303 therein. The liquid crystal layer 302 has the filter 31, which comprises a second transparent substrate 310, which may be made of transparent glass or a polymer, such as plastic. The second transparent substrate 310 has a photoresist layer 311 corresponding to the liquid crystal layer 302.

In this embodiment, the filter 31 is a color filter, and the photoresist layer 311 is a color photoresist layer. In addition, the filter may also be a monochromatic filter, and the photoresist layer may also be a monochromatic photoresist layer. In this embodiment, the photoresist layer 311 has a red photoresist (R), a green photoresist (G), and a blue photoresist (B). The color photoresist 311 in the drawing represents a green photoresist. There is a black matrix 312 on the side of the green photoresist. The backlight module 32 provides a backlight 320 through the liquid crystal module 30. The flat display 3 is defective, and the 瑕疵 in this embodiment is a defect of a bright spot. The so-called bright spot defects may be caused by the photoresist layer 311, the liquid crystal of the liquid crystal module 30, or a circuit defect. A polarizing film 304 and 305 are respectively disposed on the upper surface of the second transparent substrate 310 of the filter 31 and the lower surface of the first transparent substrate 300.

Next, in step 21, a femtosecond laser 90 is provided to focus on the light-transmitting substrate corresponding to the bright spot, so that the light-transmitting substrate corresponding to the bright spot is subjected to nonlinear multiphoton absorption and the blackening is modified, and then the bright spot is further Convert to dark spots. It is to be noted that the light-transmitting substrate in the step 21 in the embodiment is the second light-transmitting substrate 310. In the modification in step 21, the femtosecond laser beam can be used to make the region on the light-transmitting substrate corresponding to the bright spot physically change due to multiphoton absorption, resulting in scattering, birefringence, Bragg grating. The equal effect causes blackening of the predetermined area and no damage to other areas. Femtosecond laser means that the time pulse width of the laser is shorter than one picosecond (picosecond, ps = 10 ^-12 s). The projection frequency of the femtosecond laser projected onto the light transmissive substrate is a single shot ~1 GHz.

Next, it is explained that the repair produces a physical change, causing effects of scattering, birefringence, and Bragg gratings. Referring to FIG. 2, the scattering effect is first described. The second light-transmitting substrate 310 is required to generate a scattering effect to convert the bright spot into a dark spot, mainly in the ultra-short pulse femtosecond laser in step 21, The second transparent substrate 310 is processed to form a partial modification in the second transparent substrate 310 to cause a scattering effect to reduce the penetration of the backlight to achieve the effect of partially blackening the panel. As shown in FIG. 3A to FIG. 3D, FIG. 3A is a schematic cross-sectional view of the femtosecond laser focused projection to the second transparent substrate according to the present invention; FIG. 3B is a schematic diagram of the energy absorption range of the second transparent substrate. Figure 3C and Figure 3D are respectively a schematic diagram of the relationship between the modified threshold of the second transparent substrate and the absorbed femtosecond laser energy, wherein Figure 3C is a schematic diagram exceeding the modified threshold; and Figure 3D is not exceeded. A schematic diagram of the upgrading threshold. When the femtosecond laser 90 is focused onto the second light-transmissive substrate 310, the femtosecond laser energy intensity can only exceed the reform threshold 92 at the location of the region 91 and the laser intensity can range from 10 ⁸ W/cm ^{2 .} In the above, the second light-transmitting substrate 310 in the region 91 is caused to be non-linearly absorbed to form a modified region. As for the second light-transmissive substrate 310 in the region 93 at the periphery of the region 91, the energy intensity recovered is not more than the modified threshold 92 of the second light-transmitting substrate 310.

As shown in FIG. 4A, the figure is a schematic cross-sectional view of a second transparent substrate that utilizes a femtosecond laser to cause scattering of the second transparent substrate. When the femtosecond laser is irradiated on the region on the second transparent substrate 310 corresponding to the bright spot, a plurality of structures similar to the crack 3100 are formed in the region, and when the backlight 320 passes through the region, the structure is formed. The structure 3100 affects the path traveled by light, creating a phenomenon of scattering. Since light cannot pass directly through the blackened area, the original bright spot defect can be changed to form a dark spot defect. Returning to Figure 2, due to the nonlinear multiphoton absorption characteristics of the femtosecond laser 90, it will not cause damage to other areas, such as the polarizing film 304, thereby improving the quality and grade of the flat panel display 3. The wavelength of the femtosecond laser may range from 250 to 3000 nm, and the projection frequency of the femtosecond laser projected onto the transparent substrate is a single shot ~1 GHz. In the embodiment in which the scattering is generated, the selected femtosecond laser has a wavelength of 532 nm, 800 nm or 1064 nm, and the femtosecond pulse frequency is 1000 Hz to 80 MHz, and the laser is projected onto the transparent substrate. The structure 3100 is generated in a single shot by the projection points of each of the regions covered by the highlight. The pulse width of the femtosecond laser is less than or equal to 1 picosecond (ps). When the femtosecond laser projection is focused to the second light-transmissive substrate, the laser beam having a femtosecond laser to the corresponding bright spot may have a laser intensity range of 10 ⁸ W/cm ² or more. Of course, in the embodiment, the planar display 3 has a polarizing film 304 during the repair process, but in another embodiment, the polarizing film 304 may be removed to directly pass the femtosecond laser 90 to the second corresponding spot. Light transmissive substrate 310. In addition, in order to enhance the effect of femtosecond laser focusing, at least one focusing lens unit may be disposed on the optical path of the femtosecond laser projected onto the filter, which may be constituted by at least one lens or mirror.

As shown in FIG. 4B, the figure is a schematic diagram of the phenomenon of birefringence generated by the femtosecond laser focusing on the second transparent substrate. In this embodiment, the femtosecond laser is scanned in a scanning manner, for example, a zigzag path, and the focus is irradiated to a region corresponding to the bright spot of the second transparent substrate 310 to form a modified region 94, so that the region generates a period. Structure 3101 causes the effect of birefringence to occur when light enters region 94. Please refer to equations (1) to (3).

δ n = n ₂ - n ₁ ...................(1)

Half-waveplate = half-waveplate = ................(3)

Wherein n ₁ is the refractive index of the periodic structure 3101, n ₂ is the refractive index of the second transparent substrate 310, d is the thickness of the overall periodic structure, and Λ is w ₂ + w ₁ , where w ₂ represents The distance of adjacent structures in the periodic structure 3101, w ₁ represents the thickness of the single structure 3101. By adjusting the femtosecond laser beam path to control the magnitude of the d value and the direction of the structure, the modified region 94 produces an effect similar to a half-wave plate, and thus the light incident on the modified region 94 can be changed. The direction of polarization. In FIG. 4B, light 320 represents a backlight generated by a backlight. When the backlight passes through the modified region 94, since the modified region 94 has the effect of birefringence, the light 320 can be controlled by controlling the size of d. The polarization is in the direction of the polarization of the direction 95. As shown in FIG. 1, since the polarizing film 304 is disposed above the second transparent substrate 310, the polarization direction 96 is orthogonal to the polarization direction 95 of the light 320 passing through the modified region, so that the light 320 cannot pass. The polarizing film 304 produces an effect of blackening.

As shown in FIG. 4C, the figure is a schematic diagram of a modified region having a Bragg grating of the present invention. In this embodiment, the femtosecond laser 97 having radial-polarization can be further scanned in a scanning manner, for example, a zigzag path, and the focused illumination is focused onto the light-transmitting substrate corresponding to the bright spot missing line. The light-transmissive substrate that is focused and illuminated forms a modified region 98 having a Bragg grating structure 3102 therein. The Bragg grating is composed of structures 3103 and 3104 having two different refractive indices. The optical effect produced by the Bragg grating, when the backlight 320 produced by the backlight passes through the modified region 98, is reflected by the Bragg grating 3102 and cannot pass through the modified region 98 to cause a blackening effect.

It should be noted that, as shown in FIG. 2 , although the foregoing embodiment is to modify the second transparent substrate 310 , in practice, the second transparent substrate 310 is not limited. Please refer to FIG. 1 and FIG. 5 , wherein FIG. 5 is a schematic diagram of another embodiment of step 21. In FIG. 5, the femtosecond laser 90 is mainly focused and irradiated to the region corresponding to the bright spot position of the first light-transmitting substrate 300, so that the region forms a modified region. According to the principle described above, the modified region formed on the first light-transmitting substrate 300 can also achieve the effect of blackening by using effects such as scattering, birefringence, and Bragg grating. In addition, the flat panel display 3 of the present invention is not limited to a liquid crystal display, as long as it is a display having a light-transmitting substrate, such as a light-emitting diode display or a color electronic paper display, etc., when there is a defect of a bright spot, Repaired using the techniques of the present invention.

Please refer to FIG. 6, which is a schematic diagram of the flat panel display repairing system of the present invention. The flat panel display repair system 4 includes a mobile platform 40 and a femtosecond laser source 41. The mobile platform 40 has a platform 400 and a driving unit 401 that drives the platform 400 to generate a three-dimensional linear displacement motion. In this embodiment, the driving unit 401 is composed of a component such as a motor and a screw or a linear motor, but is not limited thereto. The driving unit 401 drives the platform 400 to generate a displacement movement in the X and Y directions, so that the platform 400 can perform a position adjustment action on a horizontal plane; in addition, the driving unit 401 drives the platform 400 to generate a displacement motion in the Z-axis direction to adjust the focusing unit 44. The distance from the platform 400, and thus the focus point position of the femtosecond laser 90, can also be achieved by varying the height or focal length of the focusing unit 44. A flat display 3 is placed on the mobile platform 40, which has a defect of a bright spot. The structure of the flat display 3 is as shown in FIG. 2, but is not limited by the structure, for example, a light-emitting diode display.

The mobile platform 40 is further coupled to a control unit 42 that can be a computer or a single chip with computing processing capability combined with a memory. The position of the bright spot is input by the input interface provided by the control unit 42, so that the control unit 42 records the position about the bright spot. The control unit 42 can generate a control signal to move the mobile platform 40 such that the bright spot position corresponds to the femtosecond laser 90, and the femtosecond laser 90 is focused on the light transmissive substrate of the flat display. In the case of a liquid crystal display, the light-transmitting substrate may be a light-transmitting substrate of the liquid crystal module or a substrate of the filter. In the present embodiment, the light transmissive substrate is the substrate 310 of the filter 31. The control unit 42 generates a control signal to the driving unit 401. After receiving the driving signal, the driving unit 401 drives the platform 400 to generate a displacement motion corresponding to the driving signal.

The femtosecond laser source 41 is disposed on one side of the mobile platform, which is an upper portion, which can generate a femtosecond laser 90. The femtosecond laser source 41 is further coupled to an adjustment unit 43. In this embodiment, the adjusting unit 43 further includes a laser frequency and energy adjusting device 430, and a laser wavelength adjusting device 431 for adjusting the wavelength, pulse frequency, laser dose and pulse width of the femtosecond laser. . The selected femtosecond laser may have a wavelength range of 250 to 3000 nm, in this embodiment 532, 800, 1064 nm, a femtosecond pulse frequency of 1000 Hz to 80 MHz, and a pulse width of less than 1 picosecond (ps). The projection frequency of the second laser projected onto the light-transmitting substrate is a single shot ~1 GHz, and the power density is greater than 10 ⁸ W/cm ² , but in theory, as long as the pulse width is less than 1 picosecond (ps) The second laser, regardless of wavelength and processing frequency, has the opportunity to achieve this processing effect. Further, in order to increase the focusing effect of the femtosecond laser 90, a focusing unit 44 is disposed on the optical path of the femtosecond laser 90 projected onto the flat display 3. The focusing unit 44 is composed of at least one focusing lens or mirror, and its composition can be combined by using a lens of a conventional technique, and is not limited to the state shown in FIG. In addition, a mirror 45 may be disposed on the optical path of the femtosecond laser 90 to guide the femtosecond laser 90 to the flat display 3.

The flat panel display repairing system 4 repairs the flat panel display 3 having bright spots according to the steps shown in FIG. The control unit 42 initially controls the drive unit 401 according to the set position by the control unit 42 to set the position for each bright spot or to be repaired, so that the platform 400 generates a corresponding displacement motion. Since the femtosecond laser source 41 is stationary, the bright spot can be moved to the position corresponding to the femtosecond laser 90 by the displacement movement of the driving platform 400, so that the femtosecond laser 90 is focused on the interior of the flat display 3 correspondingly. The light-transmitting substrate 310 at the bright spot position causes the multi-photon absorption of the light-transmitting substrate corresponding to the bright spot to form a modified region 310a, and the laser light repairing position can also be modulated by the optical path and the focusing module 44. The change of position is achieved, and the position of the workpiece is fixed (flying light path), or the displacement of the two is achieved. After the light-transmitting substrate 310a corresponding to the bright spot is blackened, the phenomenon of scattering or reflection caused by the light emitted from the bright spot to the structure in the modified region makes the light unable to penetrate the transparent substrate; or even because of the double The refraction effect penetrates the transparent substrate and is also filtered by the outer polarizing film 304, thereby causing the bright spot defect to become a dark spot.

In addition, it should be noted that since the present invention utilizes a femtosecond laser to cause a non-linear multiphoton absorption of the material being repaired, although the femtosecond laser 90 is in the process of repairing, as shown in FIG. The polarizing film 304 is focused on the light-transmitting substrate 310 corresponding to the bright spot, but the energy density of the polarizing film 304 is lower than the modified threshold due to the nonlinear multiphoton effect, so the polarizing film 304 is not The area through which the femtosecond laser passes through 90 light paths causes damage.

However, the above is only an embodiment of the present invention, and the scope of the present invention is not limited thereto. It is to be understood that the scope of the present invention is not limited by the spirit and scope of the present invention, and should be considered as a further embodiment of the present invention.

2. . . Flat display repair method

20~21. . . step

3. . . Flat panel display

30. . . LCD module

300. . . First transparent substrate

301. . . Thin film transistor layer

302. . . Liquid crystal layer

303. . . Support

304, 305. . . Polarizing film

31. . . Filter

310. . . Second transparent substrate

3100. . . crack

3101. . . Periodic structure

3102. . . Bragg grating structure

3103, 3104. . . Different density structures

310a. . . Blackened transparent substrate

311. . . Color photoresist layer

312. . . Black matrix

32. . . Backlight module

320. . . Backlight

4. . . Flat display repair system

40. . . mobile platform

400. . . platform

401. . . Drive unit

41. . . Femtosecond laser source

42. . . control unit

43. . . Adjustment unit

430. . . Laser frequency and energy adjustment device

431. . . Laser wavelength adjustment device

44. . . Focus unit

45. . . Reflector

90. . . Femtosecond laser

91. . . region

92. . . Renovation threshold

93. . . region

94. . . Modified area

95, 96. . . Polar direction

97. . . Radially polarized femtosecond laser

98. . . Modified area

FIG. 1 is a schematic flow chart of an embodiment of a method for repairing a flat panel display according to the present invention.

Figure 2 is a schematic cross-sectional view of a flat panel display.

FIG. 3A is a schematic cross-sectional view of a femtosecond laser focused projection onto a second light transmissive substrate.

Figure 3B is a schematic diagram of the energy absorption range of the second light-transmitting substrate.

FIG. 3C and FIG. 3D are respectively schematic diagrams showing the relationship between the modified threshold of the second transparent substrate and the absorbed femtosecond laser energy.

Figure 4A is a schematic cross-sectional view of a second light transmissive substrate utilizing a femtosecond laser to cause scattering of the second light transmissive substrate.

FIG. 4B is a schematic view showing the phenomenon of birefringence caused by focusing the femtosecond laser on the second transparent substrate.

Figure 4C is a schematic view of a modified region having a Bragg grating of the present invention.

Figure 5 is a schematic diagram of another embodiment of step 21.

Figure 6 is a schematic diagram of the flat panel display repairing system of the present invention.

2. . . Flat display repair method

20~21. . . step

Claims (25)

A flat panel display repairing method comprising the steps of: providing a flat display having a light transmissive substrate, the flat display having at least one bright point; and providing a femtosecond laser focusing illumination to the corresponding bright spot On the optical substrate, a non-linear multiphoton absorption is generated for the light-transmitting substrate corresponding to the bright spot to form a modified region, and the bright spot is converted into a dark spot, wherein the modified region is formed with a Bragg grating. The flat panel display repairing method of claim 1, wherein the femtosecond laser has a wavelength range of 250 to 3000 nm. The flat panel display repairing method of claim 1, wherein the femtosecond laser means that the time pulse width of the laser is shorter than one picosecond. The flat panel display repairing method of claim 1, wherein the femtosecond laser projecting projection light power to the light transmissive substrate is greater than 10 ⁸ W/cm ² . The flat panel display repairing method of claim 1, wherein the projection frequency of the femtosecond laser projected onto the light transmissive substrate is a single shot ~ 1 GHz. The flat panel display repairing method of claim 1, further comprising the step of projecting the femtosecond laser onto the light-transmitting substrate corresponding to the bright spot via the at least one focusing unit. The flat panel display repairing method of claim 1, wherein the light transmissive substrate is glass or a high molecular polymer. The flat panel display repairing method of claim 1, wherein the modified region is to scatter light incident on the modified region. The flat panel display repairing method of claim 1, wherein the flat panel display is a liquid crystal display having a liquid crystal module and a filter, wherein the transparent substrate is a substrate of the liquid crystal module Or the substrate of the filter. The flat panel display repairing method of claim 1, wherein the modified region is formed with a birefringent structure. The flat panel display repairing method of claim 1, wherein the display is a light emitting diode display. For example, in the flat panel display repairing method of claim 1, wherein the femtosecond pulse frequency is preferably 1000 Hz to 80 MHz. A flat display repair system includes: a mobile platform; a flat display disposed on the mobile platform, the flat display having a light transmissive substrate, the flat display having at least one bright point; and a femtosecond a laser source, which provides a femtosecond laser to focus on the light-transmitting substrate corresponding to the bright spot, so that the light-transmitting substrate corresponding to the bright spot is modified by nonlinear multi-photon absorption, and then the bright spot is Converted to a dark spot, wherein the modified region is formed with a Bragg grating. For example, in the flat panel display repairing system of claim 13, wherein the femtosecond laser source further has an adjusting unit for adjusting the wavelength, pulse frequency, laser dose and pulse width of the femtosecond laser. For example, the flat panel display repairing system of claim 14 wherein the femtosecond laser has a wavelength range of 250 to 3000 nm. The flat panel display repairing system of claim 13 is further provided with at least one focusing unit on the optical path of the femtosecond laser to modulate the femtosecond laser. The flat panel display repairing system of claim 13, wherein the mobile platform comprises a platform and a driving unit, the driving unit provides driving of the platform to generate a three-dimensional linear displacement motion. The flat panel display repairing system of claim 13 further comprising a control unit, wherein the control unit records the position of the bright spot to generate a control signal to move the mobile platform to make the bright spot correspond to the femtosecond laser. The femtosecond laser is focused on a light transmissive substrate. The flat panel display repairing system of claim 13 , wherein the display is a liquid crystal display having a liquid crystal module and a filter, wherein the transparent substrate is a substrate of the liquid crystal module or It is the substrate of the filter. The flat panel display repairing system of claim 19, wherein the filter has a polarizing film attached to the surface corresponding to the femtosecond laser. The flat panel display repairing system of claim 13, wherein the display is a light emitting diode display. A flat panel display repair system according to claim 13 wherein the femtosecond laser means that the time pulse width of the laser is shorter than one picosecond. The flat panel display repairing system of claim 13, wherein the femtosecond laser projecting projection onto the light transmissive substrate has a power density greater than 10 ⁸ W/cm ² . The flat panel display repairing system of claim 13, wherein the projection frequency of the femtosecond laser projected onto the transparent substrate is single (single) Shot)~1GHz. For example, in the flat panel display repairing system of claim 13, wherein the femtosecond pulse frequency is preferably 1000 Hz to 80 MHz.