JP4839102B2 - LCD panel - Google Patents

Description

  The present invention relates to a liquid crystal display panel, and more particularly, to a liquid crystal display panel which is a non-defective product by correcting display defects called bright spot defects and black spot defects.

  The manufacturing process of a liquid crystal display panel includes an assembling process of a TFT substrate on which a TFT element constituting a pixel circuit or the like is formed on a glass substrate and a CF substrate on which a color filter is formed. In this assembly process, after a predetermined liquid crystal is dropped on one substrate (for example, a CF substrate), the other substrate (for example, a TFT substrate) is positioned in a vacuum, and the TFT substrate and the CF substrate are overlapped. The periphery is sealed with a sealant. Thereby, a liquid crystal display panel filled with liquid crystal is manufactured. In addition to the method of dropping liquid crystal as described above, the TFT substrate and the CF substrate are bonded together, the liquid crystal injection port is left and the periphery is sealed with a sealing agent, the inside of the bonding is decompressed, and the liquid crystal injection port is There is also a method of injecting by dipping in a liquid crystal tank.

  Some liquid crystal display panels manufactured in this way have display defects. This display defect includes a bright spot defect and a black spot defect. The mechanism for the occurrence of defective bright spots is as follows. That is, foreign matter may adhere to the surface of the TFT substrate or the CF substrate before superposition. When such foreign matter adheres, the foreign matter is caught in the liquid crystal in the panel assembling process, and the liquid crystal display panel is completed while holding the foreign matter. Since the amount of liquid crystal is small in the pixel portion in which the foreign matter is excluded, the light blocking / opening effect (shutter effect) due to the operation of the liquid crystal molecules does not function well, resulting in a defective bright spot. Further, the black spot defect is a display defect that occurs because the element is not electrically driven due to a wiring defect or the like when the TFT element is formed.

  In particular, in a horizontal electric field liquid crystal display panel called an IPS system, a gap (cell gap) of a liquid crystal layer is narrowed more and more in correspondence with moving image display. The above foreign matter is airborne fiber waste generated due to various factors, metal waste generated due to wear of a driving mechanism such as a conveyance system of a manufacturing apparatus, and the like. When such a foreign substance is mixed in the area of one pixel with the same size as the cell gap, the liquid crystal of the pixel is excluded. As a result, the aforementioned bright spot defect occurs.

  Of the display defects, the black spot defect can be found by conducting an electrical characteristic test at the stage of forming the TFT element. Moreover, since the bright spot defect caused by the foreign matter occurs during the process, it always occurs with a certain probability. However, conventionally, a method for remedying such a bright spot defect has not been developed, which has been a hindrance to yield improvement.

  With respect to the prior art for countermeasures against display defects, Patent Document 1 discloses a transmissive liquid crystal panel in which liquid crystal is sealed between a pair of transparent substrates and display pixels are arranged in a matrix, and a back direction of the transmissive liquid crystal panel. In a liquid crystal display device having light source means for irradiating illumination light for display more on the surface side of the incident-side transparent substrate located on the illumination light irradiation path for irradiating the pixel where the bright spot defect has occurred Disclosed is a liquid crystal display device in which a bottom surface is formed with a recess processing portion having a depth close to the pixel, and the bottom surface is formed in a rough surface shape exhibiting light scattering characteristics.

Patent Document 2 discloses a transmissive liquid crystal panel in which liquid crystal is sealed between a pair of transparent substrates and display pixels are arranged in a matrix, and illumination light for display from the back side of the transmissive liquid crystal panel. In a liquid crystal display device having a light source means for irradiating, a transparent substrate on which a photosensitive material is formed is disposed on the outside of the transparent substrate positioned on the emission light emitting side that passes through the transmissive liquid crystal panel, and Disclosed is a liquid crystal display device in which a light-shielding film formed by exposing the photosensitive material is provided in a portion located on the irradiation path of the illumination light that passes through the portion of the pixel where the bright spot defect of the photosensitive material is generated. .
Japanese Patent No. 2584905 JP-A-5-34673

  The recessed portion disclosed in the prior art disclosed in Patent Document 1 only scatters the backlight light and cannot completely block the illumination light, so that the pixel cannot display black. For example, if the image information input to the liquid crystal panel is black on the entire surface or a black display signal is input to the recess processing portion, the recess processing portion bleeds white, resulting in poor display. This makes it impossible to accurately display telops such as movies and news.

  Since the prior art disclosed in Patent Document 2 merely forms a light shielding film, when a white display signal is input to the entire white or recessed processed portion, the recessed processed portion becomes a black dot, and the display still remains defective. Even in this case, images such as movies and news cannot be accurately displayed.

  An object of the present invention is to provide a liquid crystal display panel that improves the yield by relieving bright spot defects caused by the inclusion of foreign matters in the manufacturing process.

  This is a display defect that is visually recognized because the difference between the luminance of a pixel that has caused a bright spot defect and the luminance of surrounding pixels that are operating normally is large. If the luminance difference with the surrounding pixels operating normally or the luminance gradient with the surroundings is small, it will be difficult for the human eye to see. Therefore, the present invention processes both the surface of the glass plate constituting the liquid crystal display panel, adds an optical function, and controls the backlight light, thereby effectively eliminating both bright spot defects and black spot defects. It is something to be rescued.

  In order to achieve the above object, the means 1 of the present invention provides a light-shielding film on a part of a pixel where a bright spot defect has occurred on a glass plate constituting a TFT substrate. Block the backlight that illuminates. And it was set as the structure which processes a some recessed part processed part in the site | part of the pixel in which the said bright spot defect has generate | occur | produced of the glass plate which comprises CF board | substrate. Due to the recessed portion, the backlight light that illuminates the pixels that are normally operating around the pixel where the bright spot defect occurs is condensed on the pixel side of the bright spot defect. In other words, the recess processing portion has a function of taking the backlight light that irradiates the surrounding pixels into the bright spot defective pixels and turning them on in a pseudo manner.

  As a result, a pixel having a luminescent spot defect is lit in synchronization with a normally operating pixel around the pixel, so that color display is performed at the part of the pixel having the luminescent spot defect. Is possible. At the same time, the black spot defect in the part of the pixel where the bright spot defect occurs is also improved.

  Further, the means 2 of the present invention provides a light-shielding film on a part of a pixel where a bright spot defect of a glass plate constituting a TFT substrate is generated, and backlight light that irradiates the pixel of the part with the light-shielding film. Shut off. And it was set as the structure which affixes the optical film which has a fine uneven | corrugated shape on the surface of the site | part of the pixel in which the said bright spot defect has generate | occur | produced of the glass plate which comprises CF board | substrate. As this optical film, for example, a diffusion film used for a liquid crystal display panel of a mobile phone can be used.

  As a result, as in the above-described means 1, a pixel having a bright spot defect is lit in synchronization with the drive of the normally operating pixels around it, so that the bright spot defect has occurred. Color display can be performed at a certain pixel portion. At the same time, the black spot defect in the part of the pixel where the bright spot defect occurs is also improved.

  A pixel in a region where a bright spot defect has occurred blinks in synchronization with the surrounding pixels as the surrounding normally operating pixels are driven. Even if a black image signal is input, the bright spot does not become defective. Also, even when a white image is input, black spots do not become defective. Therefore, even if a liquid crystal display panel with a defective bright spot is manufactured due to foreign matters mixed in the assembly process of the liquid crystal display panel, it can be remedied as a non-defective product by applying the present invention. That is, the manufacturing yield is improved and the cost is reduced.

  The present invention is particularly suitable for an IPS liquid crystal display panel of a large size (for a large television having a nominal size of about 26 inches or more). However, the present invention is not limited to this, and a TN method, a VA method, and other liquid crystal display panels. It can also be applied to. Further, a display panel having a display operation principle different from that of a liquid crystal display panel, for example, a flat panel such as an electron emission type or field emission type display panel using a thin film electron source, an organic EL display panel (OLED), or a plasma display panel. -It is applicable also to the same display defect countermeasure in a display (FPD).

  Hereinafter, the best mode of the present invention will be described in detail with reference to examples.

  FIG. 1 is a schematic diagram for explaining a first example of the first embodiment of the present invention. The reference numeral 1 on the left side of FIG. 1 is an image display device, which shows a television receiver. A liquid crystal display panel 2 is mounted on the display unit of the image display device 1. An enlarged view of part 3 of the display surface of the liquid crystal display panel 2 is shown on the right side of FIG. A plurality of color filters (color filters) 4, 5, 6 partitioned by a black matrix 7 are formed on the display surface of the liquid crystal display panel 2. Each of the color filters 4, 5, 6 is a sub-pixel (sub-pixel) constituting one full-color pixel (pixel). However, in order to simplify the description, in this specification and the drawings, a red pixel (R pixel) 4 is used. , Green pixel (G pixel) 5 and blue pixel (B pixel) 6 may be described.

  In the first embodiment shown in FIG. 1, the color filters constituting the same color pixels are arranged in the vertical direction on the paper surface. That is, pixels adjacent to the target pixel in the vertical direction are configured with the same color filter, and pixels adjacent in the horizontal direction on the paper surface are configured with different color filters. In the first embodiment, a pixel in which a bright spot defect occurs is a blue pixel (B pixel). A notched portion 8 having a circular planar shape is formed on the surface of the glass plate (second glass plate) in the portion of the color filter 6 of the CF substrate corresponding to the blue pixel which is a pixel in which the bright spot defect has occurred. The recessed portion 8 has a diameter approximately the same as the horizontal width of the pixel, and is adjacent to the color filter 6 of the blue pixel where the bright spot defect has occurred and is operating in the same color. One or a plurality (three in FIG. 1) are formed so as to partially bridge the color filter of the pixel. The positional relationship and operation between the recessed portion 8 and the pixel in this example will be described later.

  FIG. 2 is a schematic diagram for explaining a second example of the first embodiment of the present invention. The same reference numerals as those in FIG. 1 correspond to the same functional parts. In the second example, the color filters constituting the same color pixels are arranged in an oblique direction on the paper surface. That is, pixels adjacent to the target pixel in the vertical direction are configured by different color filters, and pixels adjacent in the horizontal direction of the paper are also configured by different color filters. In this example, a pixel in which a bright spot defect has occurred is a green pixel (G pixel) having the color filter 5. A recessed portion 8 having a circular planar shape is formed on the outer surface of a glass plate that constitutes a CF substrate corresponding to a green pixel that is a pixel in which a bright spot defect has occurred. The recessed portion 8 has a diameter that is substantially the same as the horizontal width of the pixel, and operates normally adjacent to the color filter 5 of the green pixel where the bright spot defect has occurred in the vertical and horizontal directions. One or a plurality (four in FIG. 1) are formed so as to partially bridge the different color pixels.

  In both the first example and the second example of the first embodiment, the recessed portion 8 having a circular planar shape is formed on the glass plate of the CF substrate corresponding to the pixel where the bright spot defect has occurred. In the above description, the shape and size of the notched portion 8 are circular in plan shape and the diameter is approximately the same as the width in the left-right direction of the pixel, but is not limited thereto. That is, a part of the backlight light irradiated to the adjacent pixel of the pixel where the bright spot defect has occurred, such as an ellipse or a non-circular shape, is taken into the area of the pixel where the bright spot defect has occurred. Any material having a lens effect may be used. In addition, the size and the number of the pixels can be obtained as long as they have an effect of taking a part of the backlight light irradiated to the pixel adjacent to the pixel in which the bright spot defect has occurred into the region of the pixel in which the bright spot defect has occurred. It is not restricted to what was shown in FIG.

  Next, the detailed structure of Example 1 and the details of the operation of the recessed cut portion will be described with reference to the first example described with reference to FIG. Note that the detailed structure of the second example and the details of the operation of the notched portion are the same except that adjacent pixels differ in the vertical direction of the screen.

  FIG. 3 is a schematic cross-sectional view of the liquid crystal display panel cut along the line AA in FIG. This liquid crystal display panel is configured by sealing a liquid crystal 30 between a color filter substrate (CF substrate) 10 and a thin film transistor substrate (TFT substrate) 20. The TFT substrate 20 has pixels composed of thin film transistor circuits on the main surface of the first glass plate 21, and has a pixel electrode in contact with the liquid crystal 30 via an alignment film. The pixel electrode is preferably made of ITO, and is arranged corresponding to each color filter provided between the black matrixes 7 formed on the main surface of the CF substrate 10.

  In the TN method, a common electrode is formed on the liquid crystal 30 side of the color filter 6 (including 4 and 5) of the CF substrate, and an alignment film is formed to cover the common electrode. In the IPS method and the VA method, a counter electrode is disposed on the main surface of the TFT substrate 20. These pixel electrodes, alignment films, etc. are not shown.

  In FIG. 3, when a foreign substance 31 is mixed in the liquid crystal 30 of the pixel portion constituted by the color filter 6 shown in the center, the liquid crystal 30 that operates as a shutter function for turning on / off the pixel is Only the size is excluded. For this reason, the shutter function of the pixel constituted by the color filter 6 shown in the center is not sufficiently controlled by the display signal. That is, the pixel shown at the center always passes the backlight 50 to the CF substrate 10 side, resulting in a defective bright spot. In the first embodiment, the light shielding film 40 is provided on the outer surface of the first glass plate constituting the TFT substrate 20 corresponding to the pixel portion where the bright spot defect occurs, and the backlight light 50 causes the pixel where the bright spot defect occurs. Stop reaching. However, if the white display is performed on the liquid crystal display panel as it is, a pixel in which the bright spot defect has occurred becomes a black spot defect.

  Therefore, in the first embodiment, the recessed portion 8 is formed on the outer surface of the second glass plate 11 constituting the CF substrate 10 corresponding to the pixel portion where the bright spot defect has occurred. In Example 1, as described with reference to FIG. 1, the recessed portion 8 is formed on the second glass plate 11 above the color filter 6 constituting the pixel where the bright spot defect has occurred, as shown in FIG. 1. Three pixels are formed in the longitudinal direction of the pixel. On the outer surface of the second glass plate 11 constituting the CF substrate 10, a polarizing plate 13 is laminated and formed with an adhesive 12 on the entire surface including the recessed portion 8. A polarizing plate is laminated on the outer surface of the first glass plate 21 constituting the TFT substrate 20 on the entire surface including the light shielding film 40 or on the entire surface including the lower surface of the light shielding film 40 in the same manner as described above. Is done. The illustration of these polarizing plates is omitted.

  FIG. 4 is a schematic diagram for explaining the operation of the configuration of the first embodiment shown in FIG. A light-shielding film 40 is provided on the outer surface of the first glass plate 21 of the TFT substrate 20 of the pixel composed of the color filter 6 in which the bright spot defect has occurred due to the inclusion of the foreign matter 31. This light shielding film 40 blocks the illumination light 51 to the pixel in which the defective bright spot has occurred in the backlight, thereby preventing the bright spot from being generated in black display. In the white display, the concave notched portion 8 formed on the outer surface of the second glass plate 11 constituting the CF substrate 10 causes the illumination light 52 of the adjacent normal pixel to be emitted from the pixel side where the bright spot defect has occurred. Incorporating (condensing) light into black spots eliminates or suppresses black spot defects. The degree of elimination or suppression of sunspot defects can be adjusted by the number of recesses 8, their arrangement, shape, diameter, depth, and the like.

  As described above, both the bright spot defect and the black spot defect are eliminated or reduced according to the first embodiment, and the liquid crystal display panel having the display defect can be relieved to be a non-defective product. Hereinafter, the difference in effect when the depth and the number of recessed portions formed on the outer surface of the second glass plate constituting the CF substrate are varied will be described.

  FIG. 5A is a diagram showing a result of simulating an appropriate depth for one notched portion. A liquid crystal display panel (denoted as a liquid crystal panel in FIG. 5A) as a demonstration experimental panel used in this simulation is a nominal 32-inch WXGA (1280 × 768 pixels), an assumed pixel size of 0.5 mm × 0.17 mm, glass The plate thickness was 0.7 mm, and the liquid crystal thickness (cell gap) was 0.004 mm. FIG. 5A shows the luminance distribution on the measurement surface obtained by configuring the liquid crystal display panel thus set on the optical analysis simulator and tracing the light from the backlight.

  In FIG. 5A, the recessed portion is a substantially hemispherical recessed portion as shown in FIGS. 1 to 4, and this recessed portion is denoted as a lens. Further, the luminance in the case where the light shielding film 40 for shielding the irradiation of the backlight light to the pixel in which the bright spot defect has occurred is conceptually shown as the number of light rays. This number of rays is understood as a relative value. FIG. 5A is a simulation of lens depths 0.1, 0.2, 0.3, 0.4, and 0.5 when the lens width is 0.4 with “no upper and lower lenses” as a reference. It is.

  In the brightness distribution measurement result by the change in the width and depth of the notched portion (lens) in FIG. 5A, the bright spot defect position 1.0 on the horizontal axis corresponds to the center of the notched portion. The light-shielding film 40 was set to have a width of 0.5 mm with the center portion at the center. This width corresponds to the size of one pixel of a liquid crystal display panel equivalent to a nominal 32 inches. Here, “without upper and lower lenses” simply represents a state in which only the light shielding film 40 exists.

  Increasing the depth of the notched portion while keeping the lens width, that is, the width of the notched portion (the width in the horizontal direction in FIG. 1), increases the lens effect and improves the brightness of the notched portion. It is almost saturated at a depth of 3 mm or more. Further, as a result of analysis, it was found that when the lens depth is larger than 0.3 mm, the luminance is lowered because the incident angle of the backlight beam to the lens is increased. Therefore, from this analysis result, 30% of the part where the backlight is totally transmitted can be obtained by setting the notched portion formed in the liquid crystal display panel of the product to a width of 0.4 mm and a depth of 0.3 mm. The brightness was secured.

  FIG. 5B is an explanatory diagram of a luminance distribution measurement result based on the number of recessed portions. In FIG. 5B, when two lenses having a width (diameter) of 0.26 mm and a depth of 0.13 mm are linearly recessed in the longitudinal direction of the color filter (vertical direction in FIG. 1), the width The difference in luminance is shown when four (diameters) having a diameter of 0.13 mm and a depth of 0.065 mm are provided in the same direction as described above. A liquid crystal display panel (denoted as a liquid crystal panel in FIG. 5B) as a demonstration experimental panel used in this simulation is a nominal 32-inch WXGA (1280 × 768 pixels), an assumed pixel size of 0.5 mm × 0.17 mm, glass The plate thickness was 0.7 mm, and the liquid crystal thickness (cell gap) was 0.004. FIG. 5B shows a liquid crystal display panel set in such a manner on an optical analysis simulator, and the light distribution from the backlight is traced to obtain the luminance distribution on the measurement surface.

  From FIG. 5B, the luminance of the defective pixel is higher in the case of two lenses than in the case of four lenses, but the luminance distribution difference between the portion where the lens is present and the other portion is larger. That is, by setting the number of lenses to four, the luminance (the number of light rays) of the portion through which the light rays from the backlight are totally transmitted is assumed to be 100 when the average luminance of the pixels that are operating normally is 100. It turns out that it can be 50 or more.

  FIG. 6 is a correction process diagram for explaining the display defect correction method of the present invention. In this correction (relief) process, first, the liquid crystal display panel to be relieved is placed on the table of the two-dimensional coordinate measuring apparatus, and all the pixels on the display surface are displayed as black and the luminescent spot pixels are exposed. This bright spot pixel is a pixel in which a bright spot defect has occurred. The two-dimensional coordinate measuring apparatus determines the X and Y coordinates of the pixel where the bright spot defect has occurred and stores it as correction data.

  Next, the liquid crystal display panel is set in a light shielding film installation device, and the coordinates on the TFT substrate corresponding to the portion of the bright spot pixel on the display surface are confirmed using the correction data (process 1, hereinafter). Notation as P-1.) A light shielding film is formed in a size that covers the pixel region of the above-mentioned coordinates of the confirmed TFT substrate (P-2).

  The liquid crystal display panel provided with the light shielding film is transferred to the recess processing apparatus with the CF substrate side facing up. The above-described recess is processed by the recess processing device (P-3). Thereafter, the liquid crystal display panel is transferred to a film sticking apparatus, and polarizing plates are stuck on both outer surfaces of the CF substrate and the TFT substrate (P-4).

  FIG. 7 is a flowchart for explaining an example of a method for forming a light shielding film on a portion of a pixel having a defective bright spot on a glass plate constituting a TFT substrate. Based on the coordinates confirmed in (P-1) of FIG. 6, the pixel at the bright spot defect position on the first glass plate 21 constituting the TFT substrate 20 is confirmed (a). The metal complex solution 41 is dropped and applied to the first glass plate 21 so as to cover the determined pixel coordinate portion (b). As the metal complex solution 41, for example, a Pd complex solution can be used. For dropping the metal complex solution 41, a glass pipette or the like is preferably used.

  The applied metal complex solution 41 is irradiated with a laser 70 and baked to form, for example, a light shielding film 40 of a Pd thin film. At this time, the laser 70 turns on and off the width, the irradiation start point, and the end point so that the irradiation region is limited to the portion of the pixel. In addition, you may bake the metal complex solution 41 apply | coated, without scanning as the magnitude | size which limits the irradiation spot of the laser 70 to the site | part of the said pixel. Further, the laser 70 can be irradiated through a mask provided with a pixel-sized opening. In this way, the light shielding film 40 is formed.

  FIG. 8 is a schematic diagram for explaining an example of a method of machining a recess with the recess machining apparatus in (P-3) of FIG. The configuration of the liquid crystal display panel is the same as that shown in FIG. 3, but the second glass plate 11 has no polarizing plate attached thereto. This notch processing device is an end mill processing device. A liquid crystal display panel in which a light shielding film 40 is formed on a glass plate of a TFT substrate is placed on a processing table of an end mill processing apparatus, and a CF substrate is recessed with a carbide end mill 80. At this time, the previous coordinate data can be used for the portion to be recessed. In FIG. 8, the concave notched portion 8 is formed on the CF substrate corresponding to the pixel portion of the defective bright spot so as to bridge the adjacent normal operation pixel beyond the black matrix 7 of the defective bright pixel. To do. Thereby, it is possible to form an arbitrary number of recesses having an arbitrary size.

  FIG. 9 is a schematic diagram for explaining another example of the method for machining the recess by the recess machining apparatus in (P-3) of FIG. The configuration of the liquid crystal display panel is the same as that shown in FIG. 3, but the second glass plate 11 has no polarizing plate attached thereto. This recess processing apparatus is an etching processing apparatus. The liquid crystal display panel in which the light shielding film 40 is formed on the first glass plate 21 of the TFT substrate is placed on the processing table of the etching processing apparatus. An etching solution is dropped onto the second glass plate 11 at a portion to be recessed, and a part of the outer surface of the second glass plate 11 of the CF substrate is melted to perform the recess processing. An HF-based solution can be used as the etchant. The previous coordinate data can be used for the portion to be recessed. For dropping the etching solution, a pipette, a micro dispenser, or an ink jet nozzle can be used. In FIG. 9 as well, the second glass plate 11 constituting the CF substrate corresponding to the bright spot defective pixel portion is placed over the normal operation pixel adjacent to the black matrix 7 of the bright spot defective pixel. The recessed notched portion 8 is formed. Thereby, it is possible to form an arbitrary number of recesses having an arbitrary size.

  FIG. 10 is a schematic diagram for explaining a second embodiment of the present invention. FIG. 11 is a schematic cross-sectional view taken along the line AA in FIG. The reference numeral 1 on the left side of FIG. 10 is an image display device, which also shows a television receiver. A liquid crystal display panel 2 is mounted on the display unit of the image display device 1. An enlarged view of a part 3 of the display surface of the liquid crystal display panel 2 is shown on the right side of FIG. A plurality of color filters (color filters) 4, 5, 6 partitioned by a black matrix 7 are formed on the display surface of the liquid crystal display panel 2. Also in the second embodiment, each of the color filters 4, 5, 6 is a sub-pixel (sub-pixel) that constitutes a full-color pixel (pixel). However, in order to simplify the description, in this specification and the drawings, red is used. Description will be made assuming that the pixel (R pixel) 4, the green pixel (G pixel) 5, and the blue pixel (B pixel) 6 are used.

  In the second embodiment shown in FIG. 10, color filters of the same color are arranged in the vertical direction on the paper surface. That is, pixels adjacent to the target pixel in the vertical direction are configured by filters of the same color, and pixels adjacent in the horizontal direction of the paper are configured by filters of different colors. In the second embodiment, a pixel in which a bright spot defect occurs is a blue pixel (B pixel). A prism sheet 90 is affixed as an optical film to the color filter 6 of the CF substrate corresponding to the blue pixel which is a pixel in which the bright spot defect has occurred. Note that the countermeasure on the TFT substrate side against the defective bright spot is performed by forming the light shielding film 40 as in the first embodiment.

  The prism sheet 90 has a large number of fine triangular corrugations on the surface of the color filter of the pixel in which the bright spot defect has occurred. The longitudinal direction of the triangular bowl-shaped irregularities is the left-right direction of FIG. By installing this prism sheet 90, a part 52 of the backlight light that has passed through the same color filter adjacent in the vertical direction is replaced with the pixel side (color filter 6 located at the center in FIG. 11) where the bright spot defect has occurred. To suppress black spots when white is displayed.

  Instead of the triangular bowl-shaped prism sheet 90, an optical sheet having a semicircular bowl-shaped surface (Kamaboko lens sheet), an optical sheet formed with a large number of triangular pyramids, cones, semicircles, etc. on the surface, or an embodiment The optical sheet having the recess described in 1 can also be used.

  Further, instead of attaching the optical sheet as in Example 2 to the glass outer surface of the CF substrate, a UV (ultraviolet) curable resin is put on the CF substrate glass outer surface at a predetermined position by a pipette, a microdispenser, an inkjet nozzle or the like. By dropping and then irradiating with UV, a microlens shape such as a semicircle raised from the surface of the glass 11 can be provided.

  In the first embodiment described above, the configuration has been described in which the notched portion is protruded beyond the black matrix to the adjacent same color pixel (color filter). However, the present invention is not limited to this, and in the color filter arrangement (pixel arrangement) described with reference to FIG. 2, other colors adjacent to the color filter 6 of the pixel where the bright spot defect has occurred in the vertical and horizontal directions. The notched portion may protrude from the pixels (color filters) 4 and 5. In this case, color light different from the original color is emitted from the color filter 6 as display light from the CF substrate. However, such a point-like color difference is hardly noticeable when viewed from the entire screen, so there is no practical problem even if it is configured as shown in FIG. The same applies to the use of the optical sheet described in Example 2 and the direct formation of the microlens shape on the glass surface.

It is a schematic diagram explaining the 1st example of Example 1 of this invention. It is a schematic diagram explaining the 2nd example of Example 1 of this invention. FIG. 2 is a schematic cross-sectional view of a liquid crystal display panel cut along line AA in FIG. 1. It is a schematic diagram explaining the effect | action of the structure of Example 1 shown in FIG. It is a figure which shows the result of having simulated the appropriate depth about one recessed notch processing part. It is explanatory drawing of the luminance distribution measurement result by the number of a notch process part. It is a correction process figure explaining the display defect correction method of this invention. It is a flowchart explaining an example of the method of forming a light shielding film in the site | part of the pixel of the luminescent point defect of a TFT substrate. FIG. 7 is a schematic diagram for explaining an example of a method of machining a recess with the recess machining apparatus in (P-3) of FIG. 6. It is a schematic diagram explaining the other example of the method of processing a notch with a notch processing apparatus in (P-3) of FIG. It is a schematic diagram explaining Example 2 of this invention. It is the cross-sectional schematic diagram cut | disconnected along the AA of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Image display apparatus, 2 ... Liquid crystal display panel, 3 ... Part of display surface, 4 ... Red filter, 5 ... Green filter, 6 ... Blue filter, 7 ... Black matrix, 8 ... recessed portion, 10 ... color filter substrate, 11 ... second glass plate, 12 ... adhesive, 13 ... polarizing plate, 20 ... thin film transistor Substrate, 21 ... first glass plate, 30 ... liquid crystal, 31 ... foreign matter, 40 ... light-shielding film, 41 ... metal complex solution, 50 ... backlight, 51 ... Illumination light for bright spot defective pixels, 52... Illumination light for adjacent pixels, 60... Glass pipette, 70... Laser light, 80 ... Carbide end mill, 85. ..Prism sheet.

Claims (14)

A thin film transistor substrate in which a plurality of pixels composed of thin film transistors are arranged in a matrix on the main surface of the first glass plate, and a plurality of color filters arranged in correspondence with each of the plurality of pixels on the main surface of the second glass plate. A liquid crystal display panel comprising: a color filter substrate having: a liquid crystal sealed in a facing gap between the thin film transistor substrate and the color filter substrate; and a backlight provided on the first glass plate side to illuminate the pixels. There,
The liquid crystal display panel has pixels with defective bright spots caused by foreign matters mixed in the liquid crystal,
The outer surface of the first glass plate corresponding to the picture element of the bright spot of the thin film transistor substrate failure occurs, including the light-shielding film for blocking the backlight to the pixel in which the bright spot failure has occurred ,
On the outer surface of the second glass plate corresponding to the pixels that are provided with the light-shielding film and the surrounding normal-operating pixels, the light-shielding film is provided with backlight light transmitted through the pixels that operate normally . A liquid crystal display panel comprising: a recessed portion having a spherical shape dug into the second glass substrate, which is taken into the pixel side. In claim 1,
The liquid crystal display panel, wherein the recessed portion is formed by bridging a part of a pixel adjacent to the pixel where the bright spot defect occurs. In claim 1 or 2,
A liquid crystal display panel, wherein a color filter of a pixel adjacent to a pixel in which the bright spot defect has occurred has the same color as a color filter of a pixel in which the bright spot defect has occurred. In claim 1 or 2,
A liquid crystal display panel, wherein a color filter of a pixel adjacent to a pixel in which the bright spot defect has occurred has a color different from that of a pixel filter in which the bright spot defect has occurred. In any one of Claims 1 thru | or 4,
The liquid crystal display panel according to claim 1, wherein one or two or more of the recessed portions are arranged for a pixel in which the bright spot defect occurs. A thin film transistor substrate in which a plurality of pixels composed of thin film transistors are arranged in a matrix on the main surface of the first glass plate, and a plurality of color filters arranged in correspondence with each of the plurality of pixels on the main surface of the second glass plate. A liquid crystal display panel having a color filter substrate, a liquid crystal sealed in a facing gap between the thin film transistor substrate and the color filter substrate, and a backlight provided on the first glass plate side to illuminate the pixels. And
The liquid crystal display panel has pixels with defective bright spots caused by foreign matters mixed in the liquid crystal,
The outer surface of the first glass plate corresponding to the picture element of the bright spot of the thin film transistor substrate failure occurs, including the light-shielding film for blocking the backlight to the pixel in which the bright spot failure has occurred ,
On the outer surface of the second glass plate corresponding to the pixels that are provided with the light-shielding film and the pixels that operate normally around the pixels , the backlight that has transmitted the pixels that operate normally is transmitted to the pixel side of the defective bright spot. A liquid crystal display panel, wherein an optical film having a fine uneven shape taken in is attached. In claim 6 ,
The liquid crystal display panel, wherein the optical film having a fine uneven shape is formed by bridging a part of a pixel adjacent to the pixel where the bright spot defect occurs. In claim 6 or 7 ,
A liquid crystal display panel, wherein a color filter of a pixel adjacent to a pixel in which the bright spot defect has occurred has the same color as a color filter of a pixel in which the bright spot defect has occurred . In claim 6 or 7 ,
A liquid crystal display panel, wherein a color filter of a pixel adjacent to a pixel in which the bright spot defect has occurred has a color different from that of a pixel filter in which the bright spot defect has occurred . In any of claims 6 to 9 ,
The liquid crystal display panel, wherein the optical film having a fine uneven shape is formed by bridging a part of a pixel adjacent to the pixel where the bright spot defect occurs. In claim 10 ,
The liquid crystal display panel, wherein the optical film having a fine uneven shape is a prism sheet having a triangular corrugated surface. In claim 10 ,
The liquid crystal display panel, wherein the optical film having a fine uneven shape is an optical sheet having a semicircular bowl-shaped surface. In claim 10 ,
The liquid crystal display panel according to claim 1, wherein the optical film having a fine uneven shape is an optical sheet having a large number of triangular pyramids, cones, or semicircles formed on a surface thereof. In claim 10 ,
The liquid crystal display panel according to claim 1, wherein the optical film having a fine uneven shape is an optical sheet having a recessed portion formed on a surface thereof.