KR100807460B1 - Inspection system and method for a color filter - Google Patents

Abstract

The present invention relates to a detection device and a detection method for use in a color filter, the detection device comprises a detection unit, a light guide plate, a detection light generation unit and a plurality of photosensitive unit, the detection light generation unit has a plurality of different colors It has three light rays, and forms a mixed light by adjusting the frequency spectrum of the light rays. The mixed light has a gray scale value represented by each color pixel pattern of the color filter close to or substantially coincide with each other, so that the defects of the bright and dark portions of each color pixel pattern The same various defects can be detected simultaneously.

Color filter, color filter detection device, color filter detection method

Description

Detection device and method used for color filter {INSPECTION SYSTEM AND METHOD FOR A COLOR FILTER}

1 is an explanatory diagram showing a conventional color filter defect detection technique.

Figure 2 (a) is an explanatory view showing the detection of the defect of the color filter with the detection reflecting light according to the present invention.

Figure 2 (b) is an explanatory view showing the detection of the defect of the color filter by the detection transmitted light according to the present invention.

* Explanation of Major References *

10: white light source 11: color filter 12: first surface
13: detection member 14 page 2 20: detection device

21: Color filter 211: Red pixel pattern 212: Green pixel pattern
213: blue pixel pattern 22: light guide plate 23: light source filter
241: red light source 242: green light source 243: blue light source
251: red photosensitive section 252: green photosensitive section 253: blue photosensitive section

delete

26: optical fiber 27: mixed light 29a: reflected light
29b: reflected light 29c: reflected light 30a: transmitted light

30b: transmitted light 30c: transmitted light

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical detection device and a method thereof, and more particularly, to a detection device used in a color filter manufacturing process of a liquid crystal display (LCD) and a detection method thereof.

In recent years, the manufacturing technology of display devices has been rapidly developed. Among them, thin film transistor liquid crystal display (TFT-LCD) has been successfully used in a wide range of recreational areas, home life and various places. As consumers demand full and flawless display devices, the demand for color display of display screens is increasing day by day. Among them, color filters play an important role directly or indirectly in terms of color display, contrast, and brightness of TFT-LCDs.

The TFT-LCD substrate has a structure in which a liquid crystal is injected between two glass substrates. After the color filter is deposited on the front LCD panel, a thin film transistor is fabricated on the rear TFT panel. When a voltage is applied to the transistor, the liquid crystal is redirected, and when the light beam passes through the liquid crystal, one pixel is generated in the front panel. A backlight module provides a light source behind the TFT-array panel. The color filter is given a specific color for each pixel. Pixels having different colors are combined to form an image at the front of the panel. Once a color filter has a defect, the display screen cannot be displayed completely.

In order to prevent the waste of time and money caused by finding a defect in the color filter at the end of the manufacturing process and subsequent work, the inspectors generally have different colors (typically three primary colors of red and blue green) are used. After the color filter is manufactured, correlation detection is performed. For example, defects such as the uniformity of the thickness of the color filter thin film and the uniformity of the color are detected. If a defect is found, it is immediately destroyed or rebuilt. As shown in FIG. 1, the conventional detection method irradiates the first surface 12 of the color filter 11 to be detected by using the white light source 10, and the detection source 13 is opposed. The presence or absence of a defect in the color filter 11 is visually determined from the second surface 14.

Since the method uses a white light source, the color filter seen by the detection source 13 is a red-green-green tricolor pixel interlaced. However, in the detection method, since the detection member 13 must visually discriminate the color defect, it is difficult to distinguish which color defect is the color of the interlaced pattern. In addition, it is also difficult for the inspector to determine in which production process the problem occurred. Although the prior art is to determine the step in which the problem occurs by measuring the color on the color, the method has a problem that the manpower and time is excessively wasted and inefficient.

Another detection method is similar to the above-described method, in which a color filter is detected by a light reflection method. The method performs a detection operation of a filter that the detection light source and the detection source want to detect in the same direction. However, this method is not suitable for the large size color filter, the incident and reflected light source is not uniform, there is a problem that it is difficult to easily find the defect of the color filter.

In addition, there is a method of identifying a defect using a photosensitive device as a conventional technique that replaces the above-described visual inspection method. The white light source which can adjust the sharpness is irradiated to the color filter to detect, inputs the detection signal transmitted from the color filter to the photosensitive part, and transmits it to the detection part, and analyzes the defect. Although the method is more accurate than the naked eye detection method, since the light source is limited to the white light source, after the white light source passes through the color filter, the gray scale of each color pixel pattern on the color filter cannot be adjusted. In addition, when detecting defects, since defect detection cannot be performed simultaneously with respect to pixel patterns of all colors, there is a disadvantage that it is difficult to observe the presence and the degree of defects.

In order to briefly describe the above-mentioned contents, the detection unit is installed on the detection stage, and the red, green, and blue pixel patterns reflected by the color filter are irradiated with the detection light source from the same side as the detection unit. If the gray scale values of were 100, 100, and 60, respectively, and the gray scale value after the detection part received the light source reflection was 60, the pixel patterns of red and green showed defects in the dark areas. Abbreviated as "Black Loss"); However, in this case, since there is no gray scale contrast with respect to the blue pixel pattern, there is no way to display a defect present in the blue pixel pattern. If you want to detect the blue pixel pattern by adjusting the detection light and increasing the gray scale value of the red, green, and blue pixel pattern simultaneously (for example, if you increase the gray scale value of three colors to 140, 140, 100 at the same time), If the gray scale value appearing after the detection part receives the light source reflection is 140, this shows that there is a defect in the bright part of the pixel pattern of blue (abbreviated as "White Loss"); However, since there is no gray scale contrast with respect to the red and green pixel patterns, there is no way to display defects present in the red and green pixel patterns.

Color filters account for a significant portion of the total production cost of LCD displays. If none of the defects on the red, green, and blue pixel patterns are found by the above-described detection method (i.e., the defects of the bright and dark areas), then the unnecessary subsequent to the defective product. As the work progresses, the waste of process and time cannot be prevented. During the manufacturing process of the color filter, red, green, and blue pixel patterns typically have a deposition process sequentially. If there is a defect on the pixel pattern of any color deposited before the process is completed, the defective part is found. This replacement or re-deposition will reduce unnecessary manufacturing waste.

Therefore, by providing easy and accurate detection technology for the LCD display device, if the inspector can quickly and accurately detect the defect of the color filter, the subsequent manufacturing process can be precisely performed to increase the manufacturing efficiency and reduce the manufacturing cost. There will be.

An object of the present invention is to provide a detection device that effectively shows a defect of a color filter by using reflected light of the color filter.

Another object of the present invention is to provide a detection device that effectively shows the transmission defect of the color filter transmitted light line by using the detection device of the color filter.

Still another object of the present invention is to provide a method for detecting a color filter.

The color filter has a plurality of pixel patterns having different colors, and the detection device includes a detection unit, a detection ray generating unit, and a plurality of photosensitive units. The detection ray generator provides a plurality of light rays having different colors, wherein each of the light rays and the at least one pixel pattern represents a color correspondence, and by adjusting the frequency spectrum between the plurality of light rays, The light beam causes mixed light having a specific frequency spectrum to be formed. The plurality of photosensitive portions represent a correspondence relationship between the respective pixel patterns and colors, and are electrically connected to the detection units, and are located on the same side as the detection light generation units on the color filters. After the mixed light is applied to the pixel pattern of the color filter, a plurality of individually generated reflected light beams are injected into each corresponding photosensitive part to transmit a reflected signal to the detection part, whereby the detection part reflects the pixel pattern. Determine if there are any defects.

The color filter has a plurality of pixel patterns having different colors, and the detection device includes a detection unit, a detection ray generating unit, and a plurality of photosensitive units. The detection ray generator provides a plurality of light rays having different colors, wherein each of the light rays and the at least one pixel pattern have a corresponding relationship to their respective colors, and by adjusting the frequency spectrum between the plurality of light rays. By using the plurality of light rays, mixed light having a specific frequency spectrum is formed. The plurality of photosensitive portions represent a correspondence relationship between the respective pixel patterns and colors, and are electrically connected to the detection unit, and are located on the side opposite to the detection light generation unit on the color filter. After the mixed light is applied to the pixel pattern of the color filter, a plurality of individually transmitted light beams are injected into the corresponding photosensitive parts to transmit a transmission signal to the detection unit, whereby the detection unit transmits the pixel pattern. Determine if there are any defects.

By adjusting the frequency spectrum of different light beams, the light beams form mixed light having a specific frequency spectrum, and the gray scale values represented by the color pixel patterns of the color filter to be detected are close to or coincide with each other, effectively transmitting light beams. Alternatively, the reflected light may indicate a defect of the color filter.

The detection method comprises the following steps: (a) providing a plurality of light rays having different colors, and causing the light rays and the pixel pattern to have a corresponding relationship to their respective colors; (b) adjusting the frequency spectrum of the light beam to cause the light beam to form mixed light having a particular frequency spectrum; (c) applying the mixed light to the pixel pattern of the color filter, thereby producing a plurality of corresponding light beams individually; And (d) injecting corresponding light beams corresponding to each of the plurality of photosensitive parts, and transmitting a signal to the detection unit so that the detection unit determines whether the pixel pattern is defective.

Example

The present invention will be described below with reference to the accompanying drawings and embodiments so that those skilled in the art may better understand the objects, technical means, and embodiments of the present invention.

As shown in Fig. 2 (a), the first embodiment of the present invention is a detection device 20 in which the detection reflection light indicates a defect of the color filter 21. For example, the color filter 21 is illustrated to have a basic configuration including pixel patterns of three colors of red (211), green (212), and blue (213).

The detecting device 20 includes a detecting part (not shown in the figure), a light guide plate 22, a detecting light generating part and three photosensitive parts. The detection ray generator provides mixed light having a specific frequency spectrum, and corresponds to the three color pixel patterns of the red 211, the green 212, and the blue 213. The detection ray generating unit displays the gray scale by allowing the mixed light to pass through or reflect the tricolor pixels of red 211, green 212, and blue 213. The light guide plate 22 is positioned between the detection light generation unit and the color filter, and mixes the plurality of light rays to form mixed light having a specific frequency spectrum.

For example, the detection light generating unit includes an initial light source and a light source filtering unit 23, and the light source filtering unit 23 receives the light beams emitted from the initial light source, respectively, according to its characteristics. It converts into mixed light with different colors and with a specific frequency spectrum. A white light source may be used as the initial light source, and the frequency spectrum of the mixed light is adjusted while passing through the light source filtering unit 23. In addition, as the initial light source, a colored light source may be used to set the frequency spectrum of the mixed light. The detection light generation unit includes a plurality of initial light sources, each of which provides mixed light having different colors and having a specific frequency spectrum; The plurality of initial light sources may provide mixed light having an adjusted frequency spectrum, or set a specific frequency spectrum such that the mixed light has the set frequency spectrum while passing through the light source filter.

 The three initial light sources, that is, the red light source 241, the green light source 242, and the blue light source 243 are three light sensitive parts, that is, the red light sensitive part 251, the green light sensitive part 252, and the blue light sensitive part 253. Corresponds to. The photosensitive portions 251, 252, and 253 have a one-to-one correspondence relationship with the pixel patterns 211, 212, and 213 on color, and are electrically connected to the detection unit. In the above embodiment, the photosensitive parts 251, 252, and 253 and the detection light generating parts (that is, three initial light sources 241, 242, and 243) are provided on the same side of the color filter 21. Three initial light sources 241, 242 and 243 provide three incident light beams (not shown), red, green and blue, which are adjusted to have a specific frequency spectrum in the light source filter 23. Then, the light enters the light guide plate 22 to form the mixed light 27. The mixed light 27 may be substantially a white light source, except that the frequency spectrum between the three red, green, and blue light rays has already formed a specific relationship, so that the gray scale value reflected from the color filter to be detected is changed. Are close to or coincident with each other.

As a better embodiment, the detection device may comprise a plurality of light guides, in which the light guide is an optical fiber 26. The optical fiber receives the incident light of each of the initial light sources 241, 242, and 243, and transmits the incident light to the light guide plate 22. The optical fiber 26 and the light guide plate are connected without particular position limitation. The red, green, and blue light rays are incident on the light guide plate 22 and adjusted to have specific optical properties to form mixed light 27. Thereafter, the light guide plate irradiates the mixed light 27 to the color filter 21. In detail, the mixed light 27 is applied to the pixel patterns 211, 212 and 213 of the color filter 21 to generate a plurality of reflected light rays 29a, 29b and 29c individually. This corresponds to the first, second, and third values of the red 211, green 212, and blue 213 tricolor pixel patterns, respectively-implanted into the corresponding photosensitive portions 251, 252, 253, respectively. As a result, the reflected signals generated by the plurality of reflected light rays 29a, 29b, and 29c are transmitted to the detection unit so that the detection unit determines whether the pixel patterns 211, 212, and 213 reflect.

In addition, the three initial light sources may use a white light source (not shown) in addition to using the red light source 241, the green light source 242, and the blue light source 243. That is, the white incident light beam is incident on the light guide plate 22 via a separate light guide portion. At this time, by increasing the white light intensity of the mixed light 27, the mixed light 27 lacks the sharpness and affects the gray scale of the first, second and third values reflected from the color filter 21. The corresponding photosensitive parts 251, 252, and 253 may be prevented from operating effectively.

When the present invention is practically applied, the photosensitive portion may be an optical photosensitive portion of a Charge-Coupled Device (CCD) or Complementary Metal Oxide Semiconductor (CMOS).

The second embodiment of the present invention is shown in FIG. 2 (b). For convenience of description, the same reference numerals will be used for the same parts as those described in the first embodiment. The second embodiment has many aspects which are substantially similar to the first embodiment, and the difference between them is as follows.

Referring to both FIGS. 2 (a) and 2 (b), the first embodiment is a case in which a detector wants to detect a reflected signal. The photosensitive members 251, 252, and 253 and the light guide plate 22 are colored. It is provided in the same one side of the filter 21. The second embodiment is a case in which the detection source wants to detect the result after transmitting the mixed light through the color filter, and the detection source uses the photosensitive portions 251, 252, and 253 and the light guide plate 22 as the color filter 21. Install on the other side of Accordingly, after the mixed light 27 is applied to the pixel patterns 211, 212, and 213 of the color filter 21, the plurality of transmitted light rays 30a, 30b, and 30c respectively generated are respectively corresponded to the corresponding photosensitive portions ( 251, 252, and 253 are injected to transmit a transmission signal to the detection unit (not shown), so that the detection unit determines whether the pixel patterns 211, 212, and 213 are transmitted. Since the arrangement and function of other parts in the second embodiment are similar to those in the first embodiment, detailed description thereof will be omitted.

The present invention relates to a detection method of a color filter, the detection method comprising the following steps:

(a) providing a plurality of light rays having different colors, and causing the light rays and the pixel pattern to have a corresponding relationship to their respective colors;

(b) adjusting the frequency spectrum of the light beam to cause the light beam to form mixed light having a particular frequency spectrum;

(c) applying the mixed light to the pixel pattern of the color filter, thereby producing a plurality of corresponding signals individually; And

(d) injecting the signals corresponding to each of the plurality of photosensitive parts and transferring the signals to the plurality of corresponding detection parts, so that the detection part determines whether the pixel pattern is defective.

In the step (a), the light source filter receives the light beam from the initial light source and converts the light source into mixed light having different colors and having a specific frequency spectrum according to its characteristics; In addition, as described above, the white light source may be used as the initial light source to form the required mixed light, and the sharpness of the mixed light may also be increased. In step (b), by adjusting the frequency spectrum of the light beam, the light beam forms a mixed light having a specific frequency spectrum so that the gray scale values of the pixel patterns having different colors are at least substantially close. In step (c), if a plurality of corresponding light rays are generated from the mixed light, and the corresponding light rays are reflected after being applied to the pixel pattern of the color filter, the corresponding light rays become reflected light rays. However, in the step (c), if a plurality of corresponding light rays are generated from the mixed light, and the corresponding light rays are transmitted after being applied to the pixel pattern of the color filter, the corresponding light rays are transmitted light rays. In step (d), the plurality of photosensitive parts receive the corresponding plurality of reflected light rays or transmitted light rays, convert them into reflected signals or transmitted signals, and transmit them to the detection part, wherein the detection part of the plurality of pixel patterns Determine if there is any defect.

The actual detection steps are further explained as follows. As described above, the deposition process of the color filter generally means that the pixel patterns of red, green, and blue are mounted on the glass substrate in order. In the deposition process, the subordinate deposition unit has already deposited the pixel pattern of the prior priority deposition unit. Will affect. That is, depositing a green pixel pattern can cause defects to occur in the red pixel pattern; In addition, depositing a blue pixel pattern may cause defects in the red and green pixel patterns. Therefore, after depositing a pixel pattern of one color, a defect detection operation should be performed on the pixel pattern of the color deposited in the pre-deposition step of the color pixel pattern.

The actual experimental example is as follows. In the case of detecting defects by transmitted light, the gray scale values appearing after the white light source is transmitted through the color filter red, green, and blue pixel patterns by using a conventional white light source are 133, respectively. , 168, 144. Since the gray scale value is not uniform, the gray scale value of Black Loss or White Loss is compared with the gray scale value of all pixel patterns. Otherwise defects are not clearly detected on the pixel pattern; In the present invention, the frequency spectrum of the detection ray serves as an adjuster, that is, by adjusting the frequency spectrum of the detection ray to form the mixed light having a specific frequency spectrum, and the gray scale values of the pixel patterns of different colors. Let all be 90. Since both Black Loss or White Loss contrasts the positive value (+) or negative value (-) with the numerical value 90, it can be easily detected by the detection unit whether or not the defect is obvious.

 In the case of detecting the reflection defect by the reflected light, it is similar to the above-mentioned description, but irradiates the color filter using a conventional white light source and transmits the white light source to the red, green, and blue pixel patterns of the color filter. The subsequent gray scale values were 232, 151 and 110, respectively. Since the gray scale value is not uniform, the gray scale value of Black Loss or White Loss is compared with the gray scale value of all pixel patterns. Otherwise defects are not clearly detected on the pixel pattern; In the present invention, the frequency spectrum of the detection ray serves as an adjuster, that is, by adjusting the frequency spectrum of the detection ray to form the mixed light having a specific frequency spectrum, and the gray scale values of the pixel patterns of different colors. Let all be 110. Since both Black Loss or White Loss contrasts the positive value (+) or negative value (-) with the numerical value 110, it can be easily detected by the detection unit whether or not the defect is obvious.

The above examples illustrate the principles and effects of the present invention by way of example and do not limit the present invention. Those skilled in the art to which the present invention pertains will be able to modify and measure the above-described embodiments without departing from the spirit and spirit of the present invention. Therefore, the scope of the present invention is as described in the claims to be described later.

According to the present invention, by easily and accurately detecting defects present in the color filter, the manufacturing efficiency of the correlated manufacturing process can be increased and the manufacturing cost can be reduced.

Claims (26)

 A detection device of a color filter having a plurality of pixel patterns having different colors, the detection device comprising: The plurality of light rays having different colors, wherein each of the light rays and the plurality of pixel patterns have a corresponding relationship to their respective colors, and by adjusting the frequency spectrum between the plurality of light rays, A detection light generation unit configured to form mixed light having a specific frequency spectrum by light rays; And And a plurality of photosensitive parts having a corresponding relationship to each of the pixel patterns and their respective colors, and electrically connected to the detection unit, and positioned on the same side as the detection light generation unit on the color filter. , After the mixed light is applied to the pixel pattern of the color filter, a plurality of individually generated reflected light beams are injected into the corresponding photosensitive parts and transmitted to the detection unit, thereby detecting whether the detection unit is defective in the pixel pattern. The detection device of the color filter, characterized in that can be determined. The apparatus of claim 1, further comprising a light guide plate positioned between the detection light generation unit and the color filter to form a mixed light having a specific frequency spectrum by mixing the plurality of light rays. . The detection apparatus of claim 2, wherein the detection light generation unit comprises an initial light source and a light source filtering unit, and the light source filtering unit receives light rays emitted from the initial light source. The apparatus of claim 2, wherein the color filter comprises red, green, and blue pixel patterns. 4. The apparatus of claim 3, wherein the initial light source comprises a white light source. The apparatus of claim 2, wherein the detection light generation unit comprises a plurality of initial light sources, the plurality of initial light sources providing different colors, and wherein the mixed light has a specific frequency spectrum. . The apparatus of claim 2, further comprising a plurality of light guide parts mounted between the detection light generator and the light guide plate to receive light beams of different colors, and to transmit the light beams to the light guide plate. . 8. The color filter detecting apparatus according to claim 7, wherein each of the light guide parts comprises an optical fiber. The apparatus of claim 1, wherein each of the photosensitive parts comprises a Charge-Coupled Device (CCD). 2. The apparatus of claim 1, wherein each photosensitive portion comprises a complementary metal oxide semiconductor (CMOS).  A detection device of a color filter having a plurality of pixel patterns having different colors, the detection device comprising: The plurality of light rays having different colors, wherein each of the light rays and the plurality of pixel patterns have a corresponding relationship to their respective colors, and by adjusting the frequency spectrum between the plurality of light rays, A detection light generation unit configured to form mixed light having a specific frequency spectrum by light rays; And And a plurality of photosensitive parts having a corresponding relationship with each of the pixel patterns and their respective colors, and electrically connected to the detection unit, and disposed on the opposite side of the detection light generation unit on the color filter. After the mixed light is applied to the pixel pattern of the color filter, a plurality of individually transmitted light beams are injected into the corresponding photosensitive parts and transferred to the detection unit, thereby detecting whether the detection unit is defective in the pixel pattern. The detection device of the color filter, characterized in that can be determined. The detection method of claim 11, further comprising a light guide plate positioned between the detection light generation unit and the color filter, the light guide plate configured to mix the plurality of light rays to form mixed light having a specific frequency spectrum. Device. 13. The apparatus of claim 12, wherein the detection light generating unit comprises an initial light source and a light source filtering unit, and the light source filtering unit receives light rays emitted from the initial light source. The apparatus of claim 12, wherein the color filter comprises red, green, and blue pixel patterns. The apparatus of claim 13, wherein the initial light source comprises a white light source. 13. The apparatus of claim 12, wherein the detection light generation unit comprises a plurality of initial light sources, the plurality of initial light sources providing different colors, respectively, wherein the mixed light has a specific frequency spectrum. . The apparatus of claim 12, further comprising a plurality of light guide parts mounted between the detection light generation unit and the light guide plate to receive light beams of different colors, and to transmit them to the light guide plate. . 18. The apparatus of claim 17, wherein each of the light guide portions comprises an optical fiber. 12. The apparatus of claim 11, wherein each photosensitive unit comprises a Charge-Coupled Device (CCD). 12. The apparatus of claim 11, wherein each of the photosensitive portions comprises a complementary metal oxide semiconductor (CMOS). A detection method of a color filter having a plurality of pixel patterns having different colors, wherein the detection method (a) providing a plurality of light rays having different colors, and causing the light rays and the pixel pattern to have a corresponding relationship to their respective colors; (b) adjusting the frequency spectrum of the light beam to cause the light beam to form mixed light having a particular frequency spectrum; (c) applying the mixed light to the pixel pattern of the color filter, thereby producing a plurality of corresponding light beams individually; And and (d) injecting corresponding light beams corresponding to each of the plurality of photosensitive parts to be delivered to the detection unit, thereby allowing the detection unit to determine whether the pixel pattern is defective or not. The detection of a color filter as claimed in claim 21, wherein the step (a) comprises: a light source filter receiving light rays from the initial light source and converting the light rays into mixed light having different colors and having a specific frequency spectrum. Way. 22. The method of claim 21, wherein each of the corresponding light beams is transmitted light transmitted through the pixel pattern. 24. The method of claim 23, wherein step (b) adjusts the frequency spectrum of the light beam so that the light beam forms a mixed light having a specific frequency spectrum such that gray scale values of the pixel patterns having different colors are mutually different. A detection method of a color filter, characterized in that it is quite close. 22. The method of claim 21, wherein each corresponding ray is a reflected ray reflected from the pixel pattern. 27. The method of claim 25, wherein (b) adjusts the frequency spectrum of the light beam so that the light beam forms a mixed light having a specific frequency spectrum, whereby gray scale values of the pixel patterns having different colors are different from each other. A detection method of a color filter, characterized in that it is quite close.

Images