TWI387739B - Optical inspection device for displayer and method of the same - Google Patents

Description

Display optical detecting device and method thereof

The invention belongs to an optical detecting device, in particular to an optical detecting device for measuring various optical parameters of a display and a method thereof, which can simultaneously receive incident light from various viewing angles and direction angles of the display, so as to save the detection time. Full inspection function with in-line products.

In recent years, due to scientific and technological advances and the hot sale of various types of consumer electronics, many industries have flourished and various emerging industries have emerged, such as integrated circuit (IC), printed circuit board (PCB), and thin film transistor liquid crystal display (TFT). -LCD), electronic components/packages, and optical communication industries, etc., all industries have a place in the electronics industry today. The production of electronic components and products is generally difficult and complicated. Taking the manufacture of panel industry as an example, from the fabrication of thin-film transistors, the assembly of panels, to the final assembly of the entire module, it may undergo complicated processes and formalities. Among them, each process procedure may affect the final product due to the difference in production conditions and the instability of the process caused by various emergencies. Therefore, the electronic products produced by the products must be subjected to various electrical and optical inspections at various stages of the process to ensure the quality and reliability of the products.

For the detection of liquid crystal panels, optical parameter measurements such as chromaticity, Luminance, viewing angle and contrast play an important role in the quality control of liquid crystal displays.

The optical inspection of traditional liquid crystal panels is limited to the off-line (in-line, in-line, real-time measurement) environment, so quality monitoring can only be performed by random sampling, and product quality cannot be effectively controlled. It has a negative impact on the owner both in terms of time and cost. Furthermore, the single panel measurement method is often used in the existing panel inspection technology. Therefore, to measure the entire panel, the inspection machine must move the optical probe or panel in two dimensions, which will take considerable inspection time. Furthermore, in order to obtain optical parameters such as chromaticity and luminance of different viewing angles and azimuth angles, the optical probe or the panel must be relatively angularly yawed, but in practice, the rotation and positioning mechanism of the machine in the detection mechanism is quite complicated and additional. The mechanism action will increase the required detection time, which is the disadvantage. An optical detection device as disclosed in U.S. Patent No. 6,804,001, which is a measurement architecture developed by Fourier optics and spectroscopic image spectroscopy. Wherein, the device further comprises a rotating mechanism, which can rotate the detecting angle device to different orientations, thereby obtaining optical information of chromaticity and luminance of different viewing angles of the point to be measured. However, with the shortcomings of the prior art described above, if optical information of various viewing angles and azimuths of the object to be tested is obtained, it is necessary to move and rotate the optical probe or the panel sample in two dimensions, so that the measurement time is extremely long, and It is not easy to produce on-line inspections.

In summary, the optical inspection machine of the liquid crystal panel still has many shortcomings, including slow measurement speed, space occupied by the detection device, complicated machine and high price. The most extreme of these is that it is impossible to directly measure in the actual production line process, and it can only be sampled in a random manner or the product is inspected after the completion of the process. This method greatly increases the defect rate of the finished product and increases the intangible Production costs. Therefore, there is an urgent need for the industry to develop a new display optical inspection device that can not provide excessive production line or plant space, in addition to providing satisfactory detection speed. The most important of these is the ability to provide on-line inspection of all products in the online process (including offline testing) to monitor and ensure product quality and process reliability.

One of the viewpoints of the present invention is to provide an optical detecting device capable of simultaneously measuring various viewing angle and azimuth optical signals on a display panel, which has achieved the above object by controlling the density and position of the light guiding member disposed on the light receiving body.

Another aspect of the present invention is to provide an optical detecting device which is simple in structure, and has a semi-circular housing, and can be divided into two light-receiving portions so as to be slidably overlapped with each other to reduce the number of light guiding devices required.

The object of the present invention is to provide an optical detecting device capable of simultaneously measuring various viewing angle and azimuth optical signals on a display panel, which can reduce the time and cost required for the prior art to perform detection.

Another object of the present invention is to provide a display optical detecting device which can be set up to directly perform optical inspection on a product in an in-line or off-line test.

In order to achieve the above object, the present invention provides a display optical detecting device which is provided with a plurality of light guiding elements on a light receiving body for conduction as a light source. When the device is located at the position to be tested of the panel, the light source in the area will be conducted by the light guiding element that is filled on the device, and finally received by the light sensor and subjected to signal conversion processing to obtain optical at various angles. Measurement parameters.

The optical detecting device of the present invention comprises an inner hollow semi-circular shell-shaped light-receiving body which can be covered on the plane to be tested; a plurality of light-guiding elements can conduct the received radiant light, one end of which is distributed on the inner surface of the light-receiving body, and the other end And extending through the light receiving body; further comprising a plurality of light sensing elements coupled to the corresponding plurality of light guiding elements to receive the radiated light signals.

The invention also discloses a method for optical detection of a display, the method comprising the steps of: providing a semi-circular shell-shaped inner hollow light-receiving body, and arranging a plurality of light-guiding elements thereon; and placing the light-receiving body on the display to be tested a region, wherein the plurality of light guiding elements receive the optical signal radiated by the display, and then transmitted to the plurality of light sensing elements outside the light receiving body; and converting the optical signal into a charge signal for processing.

The above optical detecting device can be axially rotated by its central axis to ensure that the same light guiding element can receive optical signals of different azimuth angles. In another embodiment, the light receiving body of the optical detecting device includes a first light receiving portion and a second light receiving portion, which are slidably corresponding to overlap one light receiving portion on the other light receiving portion, so that the same light guiding member can receive To the optical signal from different perspectives.

Further advantages of the invention will be apparent from the following detailed description of the embodiments of the invention.

Different embodiments of the invention will now be described. The following description provides specific details of the implementation of the invention and is intended to provide a thorough understanding of the embodiments. Those skilled in the art will appreciate that the present invention may be practiced without these details. In addition, some well-known structures or functions may be described or described in detail to avoid obscuring the description of the various embodiments. The terms used in the following description will be interpreted in the broadest sense, even if A detailed description of a particular embodiment of the invention is used together.

First, please refer to FIG. 1, which is a cross-sectional view of the display optical detecting device 100 in the embodiment of the present invention. In the embodiment, the optical detecting device 100 includes a light receiving body 101, a plurality of light guiding elements 103, and a light sensing element 105. In the embodiment of the present invention, the light-receiving body 101 is preferably a semi-circular shell structure, and a hollow space is formed inside thereof. At the time of detection, the light-receiving body 101 is placed on the light-emitting surface of the panel to be tested 107, so that the light radiated from the panel 107 is enveloped in the space inside the light-receiving body 101. The arrows shown in the figure indicate the direction of light radiating from the various angles of view at a certain point on the panel 107. The light-receiving body 101 has a plurality of light-guiding elements 103, one end of which is disposed on the inner surface of the light-receiving body 101, and the other end of which extends through the light-receiving body 101 to be coupled to the external light-sensing element 105. The entrance end of the light guiding element 103 is disposed inside the light receiving body 101 to receive light incident from various angles and conduct it to the outside of the light receiving body 101. In the embodiment of the present invention, the light guiding component 103 can be an optical fiber, which comprises a fiber of quartz, glass, or plastic. The number and position of the light guiding elements 103 disposed on the light receiving body 101 depend on the user's detection details and requirements, and the manner of arrangement thereof will be described in the following embodiments. 2 shows a schematic view of the optical detecting device 100 placed on the panel 107. As shown, the user can cover the light-receiving body 101 on any of the planar areas of the panel 107 to be inspected. It should be noted that the size of the light-receiving body 101 may be changed or adjusted depending on the size of the panel 107 and the detection condition of the user, and is not limited to the relative ratio of the panel 107 and the light-receiving body 101 presented in the drawing. Next, please refer to FIG. 3, which illustrates the case where the optical signal is conducted in the light guiding element 103. In the present embodiment, the light guiding element 103 includes a core portion 110 and a casing portion 111. The core portion 110 is a portion of the light guiding element 103 responsible for optical signal transmission, and the outer casing portion 111 is wrapped around the periphery of the core portion 110. The light emitted from the display panel enters the core portion 110 of the light guiding element 103 from the entrance end of the light guiding element 103 inside the light receiving body 101. The incident light will continuously generate total internal reflection (TIR) at the interface between the core portion 110 and the outer casing portion 111 so that the intensity of the optical signal during the reflection process is not attenuated and the real signal can be transmitted to the distant destination. Therefore, the refractive index of the core portion 110 must be larger than that of the outer casing portion 111 to achieve a total reflection transmission mechanism.

4, the schematic diagram of the connection relationship between the light guiding element 103 and the outside of the light receiving body 101 is shown. As shown in the figure, one end of the light guiding element 103 extending from the light receiving body 101 is coupled to a light sensing element 105 and the optical signal is transmitted thereto. The light sensing component 105 transmits image information of the received optical signal into a charge form by photoelectric conversion to a processor 109. The processor 109 can simultaneously collect and convert the charge signals transmitted from the plurality of light sensing elements 105 into digitally processable signals to obtain various optical parameters that the user wants to know, such as the chromaticity and luminance of the display panel. Values such as angle of view and contrast.

The number and position of the light guiding elements 103 of the present invention disposed on the light receiving body 101 depend on the detection requirements of the user. Figure 5a shows the consideration and arrangement of the light guiding elements according to different viewing angles and azimuth angles in the embodiment of the present invention. Figure 5a is a top view of the person looking down from the top surface of the semicircular shell-shaped photoreceptor 101. The thick line in the figure represents the viewing angle of the respective viewing angles and the inner surface of the light-receiving body 101 when the light from the plane of the display is radiated from the center of the bottom surface of the light-receiving body 101, and the viewing angle is the center of the inner surface of the light-receiving body 101. The arc line in the figure represents the azimuth line generated when the light from the plane of the display radiates from the center of the bottom surface of the light-receiving body 101 to the periphery, and the angles of the respective sides are centered on the center of the bottom surface of the light-receiving body 101. Concentric circles. According to the above definition of the viewing angle and the azimuth angle of the display plane, as shown in FIG. 5b, when the user wants to measure the optical value in a certain viewing angle direction of the display, the light guiding element 103 can be disposed on the viewing angle line ( In the light-receiving body 101, an arc distributed along the inner plane thereof, the density of the light-guiding element 103 disposed on the viewing angle line depends on the fineness of the user to measure. In FIG. 5c, it shows the arrangement of the light guiding elements 103 at various angles of the display, and the user can determine the density of the light guiding elements 103 arranged in the corners of the respective sides according to the needs of the user.

In addition to determining the position and density of the light guiding elements disposed on the light receiving body, other embodiments of the present invention also provide a method for reducing the use of the light guiding elements, which is achieved by the rotation or movement of the light receiving body. efficacy. As shown in FIG. 6, it shows the operation of the light guiding element 103 used in the azimuth line by the rotation of the light receiving body 101 in the embodiment of the present invention. The white circle 113 in the figure represents the original azimuth line. The light guiding elements (four shown in this embodiment). In the past, if a user wants to increase the density of the detection points in the azimuth line, it is necessary to configure an additional light guiding element in order to achieve this. However, in the embodiment of the present invention, the light-receiving body 101 can be axially rotated by its central axis, and its rotation direction is indicated by a black arrow in the figure. After the light-receiving body 101 rotates, the originally arranged light guiding element will move to another position, as shown by the dense circle 115 in the figure, so that the optical parameters of other azimuth angles on the azimuth line can be measured by the same light guiding element. . In this way, the user can first detect the value of the position of the white circle 113 during the detection process, and then rotate during the detection period to continue the value of the position of the circle 115 of the measurement line, so that the same number of light guiding elements are arranged. Multiples of optical inspection data are available, while reducing the time and cost of testing. It should be noted that the direction of rotation in this embodiment is for illustrative purposes only. In practice, the light-receiving body 101 can also be rotated counterclockwise, which is self-evident.

In addition to reducing the number of configurations on the azimuth line, the present invention also provides another method for reducing the required amount of light guiding elements on the viewing angle line, as shown in FIG. 7a and FIG. 7b, which is another In the embodiment, the operation of the light guiding element 103 to be used on the viewing angle is reduced by sliding the different portions of the light receiving body 101. As can be seen from FIG. 7b, the light-receiving body 101 in the present embodiment is divided into a first light-receiving portion 117 and a second light-receiving portion 119. The white circle 121 in the figure is a light guiding element (for example, two) originally provided in the first light receiving portion 117 of the light receiving body 101. This embodiment assumes that the second light receiving portion 119 of the light receiving body 101 is not provided with any light guiding element. In the past, if the user wants to detect the optical values of other detection points on the viewing line of the second portion, it is generally required to configure an additional light guiding element there. However, in the embodiment of the present invention, the light-receiving body 101 is designed such that the first light-receiving portion and the second light-receiving portion can slide along each other, so that one of the light-receiving portions overlaps with the other light-receiving portion. The direction of movement can be as shown by the arrows in Figures 7a and 7b. In the present embodiment, the first light-receiving portion 117 of the light-receiving body 101 is slid over the second light-receiving portion 119, and the light-guiding member (white circle 121) originally disposed on the first light-receiving portion 117. ) moves to the dense line circle 123 in the direction of the second light receiving portion 119. In this way, the user can first detect the value at the position of the white circle 121 during the detection process, and then perform the sliding of the first light receiving portion 117 or the second light receiving portion 119 of the light receiving body 101 during the detection period, and continue the measurement line circle 123. The value at the location. Therefore, the optical detection data on the entire photoreceptor 101 at the same viewing angle can be detected only by providing a certain number of light guiding elements on the half of the light receiving body 101, and the time and cost required for the detection are reduced.

As described above, the optical detecting device of the present invention is very suitable for application in the production line on the production line because of its simple structure and convenient setting, and the simultaneous measurement of the measuring points on the viewing angle and the azimuth angle of the display panel. . The application is shown in FIG. 8 , which is a schematic diagram of the optical measuring device used in the general liquid crystal display panel manufacturing process of the present invention. As shown in the figure, the general liquid crystal display production process includes three main processes, such as an array, a cell, and a module. The array process is mainly for manufacturing a thin film transistor (TFT) and a color filter; the panel process is a thin film transistor substrate and a color filter substrate which are completed by the front array process. Performing alignment processing, alignment bonding, and liquid crystal injection; in the final module process, the completed liquid crystal panel will be taped automatic bonding module (TAB, tape automatic bonding), printed circuit board (PCB) , printed circuit board), backlight module (back-light), and frame (frame) and other peripheral components for assembly. In the general liquid crystal display process, after the panel process is completed, there will be a P inspection site (panel inspection) and a M inspection site (module inspection) before entering the modular process. The content is nothing more than the analysis of the yield of the LCD panel before and after modularization. The optical detecting device of the present invention can be directly introduced into a general panel manufacturing process, for example, if an in-line optical detecting station is added between the P inspection site and the module site, or Another optical inspection site is installed between the module site and the M inspection site to improve the reliability and quality of the finished LCD panel. The advantage of the embodiment of the invention is that it can be directly imported into the online process. As shown in FIG. 8, in the online process, the liquid crystal display semi-finished products are arranged on a tape winding mechanism 125 to move between the processing stations. The optical detecting device of the present invention can be disposed in a fixed position above the tape winding mechanism 125. At each point, optical inspection of each passing product. This design method not only meets the requirements for full inspection of online products, nor does it affect the normal process of panel production.

In summary, the structure and method of the embodiments of the present invention are designed to be applied to the optical detection step in the manufacturing process of the display panel. Its novel structural design not only achieves the function of simplifying the detection device, saving the time required for general optical inspection, but also can be directly imported into the production process of the production line for immediate monitoring to ensure that the optical performance of all products can meet the quality requirements. .

The invention is not limited to the specific details described herein. Many different variations of the invention relating to the foregoing description and drawings are permitted in the spirit and scope of the invention. Therefore, the invention is intended to be limited by the scope of the appended claims.

100. . . Optical detection device

101. . . Light body

103. . . Light guiding element

105. . . Light sensing component

107. . . panel

109. . . processor

110. . . Core part

111. . . Shell

113. . . White circle

115. . . Dense line circle

117. . . First light receiving unit

119. . . Second light receiving unit

121. . . White circle

123. . . Dense line circle

125. . . Tape and reel mechanism

The invention may be best understood by referring to the following description of the embodiments of the invention and the accompanying drawings. However, the invention is not limited by the details in the drawings. In fact, embodiments of the invention may be practiced in different ways.

1 is a cross-sectional view of an optical detecting device for a display according to an embodiment of the present invention;

2 is a schematic view showing an optical detecting device placed on a panel according to an embodiment of the present invention;

Figure 3 is a schematic view showing the transmission of optical signals in the light guiding element of the present invention;

Figure 4 is a schematic view showing the connection of the light guiding element to the external device;

Figure 5a shows a top view of different viewing angles and azimuthal positions in a half circle;

Figure 5b shows the arrangement of the light guiding elements according to different viewing angles in the embodiment of the present invention;

Figure 5c shows the arrangement of the light guiding elements according to different azimuth angles in the embodiment of the present invention;

Figure 6 is a schematic view showing the use of a light guiding element on the azimuth line by the rotation of the light receiving body in the embodiment of the present invention;

FIG. 7a and FIG. 7b are schematic diagrams showing the use of a light guiding element on a viewing angle line through sliding of different portions of a light receiving body according to another embodiment of the present invention; and

FIG. 8 is a schematic diagram of an optical measuring device used in a general liquid crystal display panel manufacturing process according to an embodiment of the present invention.

100. . . Optical detection device

101. . . Light body

103. . . Light guiding element

107. . . panel

Claims (12)

A display optical detecting device comprises: a light receiving body having a hollow inner structure of a semicircular shell, which can cover a display plane of the display to be tested; and a plurality of light guiding elements capable of transmitting the light radiated by the display plane, the first One end is distributed on the hollow surface inside the light-receiving body, and the second end passes through and extends to the outside of the light-receiving body, wherein the light-receiving body can be axially rotated by the central axis thereof, so that the plurality of light guiding elements can receive the light receiving body And a plurality of optical sensing elements coupled to the second ends of the plurality of light guiding elements to receive light radiated by the display plane. The display optical detecting device of claim 1, wherein the plurality of light guiding elements comprise a quartz optical fiber, a glass optical fiber or a plastic optical fiber. The display optical detecting device of claim 1, wherein the plurality of photo sensing elements comprise a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS) sensor. The display optical detecting device of claim 1, further comprising an optical signal processing unit coupled to the optical sensing component to convert the received optical signal into a digitally processable signal. The display optical detecting device of claim 1, wherein the plurality of light guiding elements determine the density and position of the light receiving body on the light receiving body according to the angle of view and the azimuth angle required for the detection. A display optical detecting device comprises: a light receiving body having a hollow inner structure of a semicircular shell, which can cover a display plane of the display to be tested; and a plurality of light guiding elements capable of transmitting the light radiated by the display plane, the first One end is distributed on the hollow surface of the light-receiving body, and the second end passes through and extends to the outside of the light-receiving body, wherein the light-receiving body includes a first light-receiving portion and a second light-receiving portion, and the second light-receiving portion is slidable The first light-receiving portion is superposed to receive the light signal at different viewing angles of the light-receiving body, and the plurality of light-guiding elements are disposed in one of the first light-receiving portion and the second light-receiving portion; and the plurality of light sensing elements, and The second ends of the plurality of light guiding elements are coupled to receive light radiated by the display plane. A method for optically detecting a display, comprising the steps of: providing a semi-circular shell-shaped inner hollow light-receiving body, and arranging a plurality of light-guiding elements thereon; placing the light-receiving body on a display area on the display, and causing the plurality of light guides The optical component receives the optical signal radiated by the display, and then transmits the optical signal to the external light sensing component outside the light receiving body; the optical light body is axially rotated by the central axis, so that the same plurality of light guiding components can detect different Azimuth position; and The above optical signal is converted into a charge signal for processing. The optical detection method of the display of claim 7, wherein the plurality of light guiding elements comprise a quartz fiber, a glass fiber or a plastic fiber. The display optical detection method of claim 7, wherein the plurality of photo sensing elements comprise a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS) sensor. The display optical detection method of claim 7, further comprising an optical signal processing unit coupled to the light sensing element. The display optical detection method according to claim 7, wherein the plurality of light guiding elements determine a density and a position on the light receiving body according to a viewing angle and an azimuth angle required for the detection. A method for optically detecting a display, comprising the steps of: providing a semi-circular shell-shaped inner hollow light-receiving body, and arranging a plurality of light-guiding elements thereon; placing the light-receiving body on a display area on the display, and causing the plurality of light guides The optical element receives the optical signal radiated by the display and transmits the optical signal to the plurality of light sensing elements outside the light receiving body, wherein the light receiving body includes the first light receiving portion and the second light receiving portion, and the plurality of light receiving portions are relatively slid. The light guiding element is disposed in the first light receiving portion and the second light receiving portion The first light-receiving portion and the second light-receiving portion are relatively slid and overlapped to facilitate detecting different viewing angle positions by the same plurality of light guiding elements; and converting the optical signals into electric charge signals for processing.