TWI280434B - Display panel with open/short test design - Google Patents

Abstract

A display panel has a substrate and a plurality of data lines disposed on the substrate for driving the display panel to display images. A plurality of optical sensors are disposed on the substrate. One side of each optical sensor is electrically connected to the data line and the other side thereof is connected to a test pad. When the optical sensor is irradiated by blazing light, the data line and the test pad are electrically connected. Thus, an open/short test of the display panel can be performed via the test pad. When the blazing light is removed, the optical sensors don't conduct and the data lines can drives the display normally to perform display operation.

Description

1280434 V. INSTRUCTION DESCRIPTION OF THE INVENTION (1) Field of the Invention The present invention provides a display panel, particularly a display panel having an open/short t es t design. Prior Art With the rapid development of technology, thin, power-saving, portable and intelligent information products have flooded our living space, and monitors have played a very important role in it, whether it is mobile phones or personal digital devices. An assistant or a notebook computer requires a display as a communication interface for human-machine communication. Among them, the liquid crystal display has a thin and light appearance, low power consumption and no special characteristics of light pollution. It has been widely used in portable information products such as notebook computers (n 〇teb 〇〇k) and personal digital assistants (PD A). There is even a tendency to gradually replace the cathode tube (CRT) monitor of a conventional desktop computer. Since the liquid crystal molecules have different polarization or refraction effects on the light in different alignment states, the liquid crystal molecules in different alignment states can be used to control the amount of light penetration, and further generate different intensity output light, and the liquid crystal display is The use of such characteristics of liquid crystal molecules to produce red, blue, and green light of different gray scale intensities further enables the liquid crystal display to produce rich images. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . The liquid crystal display j 〇 includes a display panel

Page 5 1280434 V. Description (2) (display panel) 12. A control circuit 14, a data line driving circuit 16 and a scanning line driving circuit 18. The display panel 1 2 includes a substrate and a display unit disposed on the surface of the substrate. The display unit includes a plurality of pixels, and each of the pixels can represent different images according to the image data. In addition, the display panel 1 2 has a plurality of data lines (data li ne) 22 'the plurality of lines perpendicular to the data line 22 scan line 24' and a plurality of electrical connections to the data line 22 and scanning The pixel circuit 26 of line 24. For convenience of explanation, only one pixel circuit 26 is shown in FIG. 1, in fact, each of the display panels 1 2

The intersection of the strip data line 22 and the scan line 24 (intersectioii) is provided with a pixel circuit 2 6 electrically connected to the corresponding data line 2 2 and the scan line 24 respectively. Therefore, the pixel circuit 26 is a matrix (1113 7 1) The method of ^) is distributed on the display panel 12, that is, the data lines 22 are arranged according to the direction of the matrix row, and the scan lines 24 are arranged according to the direction of the matrix matrix w), and each The binary circuit 2 g is connected to the pixel to drive the corresponding pixel to display the image. ί ί Ϊ 〇 的 的 的 通 通 通 通 通 通 通 通 通 通 通 通 通 通 通 通 通 通 通 通 通 通 通 通 通 通 通 通 通 通 通 通 通 通 通 通 通 通Therefore, the display panel J 2 often has another | test power ^, which is located in the peripheral area of the display panel 2).凊 Refer to Figure 2, Figure 丨 Intention. As shown in Figure 2, test pad 32"

Page 6 1280434 V. Description of the invention (3) The prime (red, blue, and green) is tested, and the data line 2 2 (DL1, DL2, DL3, etc.) is electrically connected according to the color of the pixel they drive. To the corresponding test pad 3 2 , therefore, as long as the appropriate test signal is input via the test pad 3 26, it can be determined whether the display panel 12 has a defect according to the display condition of the display panel 12 to determine the display panel 1 2 Do you need to discard or perform other processing patches? In order to facilitate the test 5, multiple data lines 2 2 will be electrically connected to the test pad 3 2 during the test. Therefore, after the test is completed, an additional laser cutting process is required, as shown in FIG. 2 . The laser cutting process can cut off the electrical connection between the data lines 22, so that the data lines 22 can operate independently, and the display panel 12 is normally driven to perform image display. However, this additional laser cutting process is not only complicated, but also requires a lot of process time, which leads to a decrease in yield. In addition, after the laser cutting process, the connection between each data line 22 and the test pad 32 is performed. It will be disconnected, so once the product has any problems in the subsequent process, the display panel 12 cannot be detected or traced by re-performing the circuit connection test. Therefore, how to improve the design of the circuit connection test in the display panel 12 is one of the most important issues at present. SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a display panel having a circuit connection test design that overcomes the cumbersome and costly process of conventional circuit connection testing.

1280434 ,

V. Description of the invention (4) The problem of a large amount of time.

In a preferred embodiment of the present invention, a display panel having a circuit connection test design includes a substrate and a plurality of data lines disposed on the substrate to drive the display panel for image display. The surface of the panel is further provided with a plurality of photosensitive elements, one side of each of the photosensitive elements is electrically connected to one end of each of the data lines, and the other side is electrically connected to a test pad 5, wherein the photosensitive element is subjected to a certain strength When the light is irradiated, the photosensitive element is turned on to electrically connect the data line and the test cymbal, and therefore, the display panel is subjected to a circuit connection test through the test pad, and when the photosensitive element is not exposed to light When irradiated, the photosensitive element is in a closed state 'to enable the data line to drive the display panel to perform the display operation.

Since the display panel of the present invention comprises a plurality of photosensitive elements disposed between each of the data lines and the test panel, the light between the respective lines and the test leads can be determined by the illumination of the light. The connection status can save the laser cutting process that is necessary in the conventional technology, so the process time can be greatly reduced, and the output V can be effectively improved.

Embodiments Please refer to FIG. 3, which is a diagram of a liquid crystal display device 10 in accordance with a preferred embodiment of the present invention. The liquid crystal display 〇 includes a display panel η 2, control

128〇43£^ V. Description of the invention (5) One circuit 1 14, one material is prevented from going to the surface of the substrate, and the display is placed on the surface of the substrate and a display unit is set outside, showing t ^ on ^ The gray scale of V?1 constitutes an image. This is perpendicular to the second sister t 112 and has a plurality of data lines 122, a plurality of chromium lines 12^ γ lines > 12♦, a scan line 124' and a plurality of electrical connections to the capital; no pixels The circuit 126, in fact, is provided at the intersection of the display panel-T2 and the scanning line 124. The electrical connection is made to the corresponding asset line 122 and the line 12', and the +2 is replaced by the I26 system. Distributed in a matrix manner on the display panel 112 ° 'that is, the strict data line 丨 2 2 is arranged according to the direction of the row of the matrix, the scanning lines 1 24 are arranged according to the direction of the matrix, and each of the pixel circuits 1 2 6 corresponds to one pixel, and drives the corresponding pixel to perform multi-image display. In addition, the display panel Π 2 is provided in the peripheral area 28 (the dotted line part ^ is provided with a test circuit for performing the lean test on the display panel 1 i 2 . Please refer to FIG. 4 , and FIG. 4 is the peripheral area 128 in FIG. 3 . A partial enlarged view. As shown in FIG. 4, a plurality of photosensitive elements 130 and at least one test pad 132 are disposed in the peripheral area 丨28, wherein one side of each of the photosensitive elements 1 30 is electrically connected to the data. Line 1 2 2 (DL db 2, DL 3·^ end, and the other side is electrically connected to test pad 13 2 through a suitable wire. In a preferred embodiment of the invention, photosensitive element 1 3 0 a semiconductor

Page 9 1280434 __ _ 5, invention description (6) film, such as an amorphous island of Camorphous isiand), in addition, the number of test pads 1 3 2 is three, respectively, to display different colors The pixels (red, blue, and green) are tested, and the data lines 1 2 2 (DLl·, DL2, DL3, etc.) are electrically connected to the corresponding test pads 132 according to the color of the pixel display. . It is worth noting that the pixel circuit 1 2 6 on the surface of the display panel 1 1 2 usually contains a low-temperature polycrystalline polycrystalline silicon transistor (1 〇wte ^ P erature pol ysi l icon thin fi lm transi s^ In the case of a spar film, it is usually necessary to form an amorphous island, and a polycrystalline stone island is formed by the amorphous island and serves as an active region of the low-temperature polycrystalline thin film transistor. Therefore, in the present invention In the preferred embodiment, it is only necessary to appropriately adjust the shape of the reticle when fabricating each of the low-temperature polycrystalline lamellae transistors, thereby forming the photosensitive element 1 30 in the peripheral region 1 28 without using any An additional process: The photosensitive element 110 is electrically connected to each other by the f-sensing element 130, which is subjected to a certain intensity of current, in other words, the data line 122 is electrically connected to the test port 132, so Test the test wheel, the test signal can be tested via the test pad 13〇, and the display result of the display panel η 2 is determined according to the display result of Wei P 2 . Need Discarding or re-machining for other patches ^

Page 10 1280434 V. Invention Description (7) After completing the circuit connection test, only the photosensitive element 110 is shielded, and the electrical connection between each data line 122 and the test pad 130 can be interrupted, so that each data line 1 2 2 Independent operation, normal display panel 11 2 for image display. For example, after the circuit connection test is completed, the qualified display panel 11 2 is packaged, an outer frame is mounted around the display panel 112, and the photosensitive element 130 is covered, so that the display panel 112 can be normalized. Image display. In this way, even if the display panel 11 2 needs to be re-performed in the subsequent process, the circuit connection test can be performed again under strong light irradiation only by removing the outer frame. In addition, although the liquid crystal display panel is taken as an example to illustrate the structure of the display panel 1 1 2 of the present invention, the application range of the present invention is not limited to the liquid crystal display panel, and can be easily used by those skilled in the art. The present invention is applied to other types of display panels, such as an organic light emitting display panel, in accordance with the above description and illustration. Compared with the prior art, the display panel of the present invention uses a photosensitive element to control the electrical connection between the data line and the test pad, and the data line can be smoothly turned on or off by merely changing the surrounding illumination state. The electrical connection with the test pad does not require an additional laser cutting process, and the photosensitive element of the present invention is fabricated on the surface of each of the thin film transistors on the surface of the display panel, and does not require an additional process. Therefore, it can effectively simplify the production process, greatly shorten the process time, and increase production. In addition, since the photosensitive member is utilized in the display panel of the present invention

1280434 V. Invention Description (8) As a switch to control the electrical connection between the data line and the test pad, even if the display panel needs to be re-performed in the subsequent process, it can be strong. The circuit quick junction test is performed again under light irradiation to detect or trace the cause of the fault, so that the quality of the product can be effectively improved. The above-mentioned preferred embodiments of the present invention are intended to be within the scope of the present invention.

Page 12 1280434

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic illustration of a conventional liquid crystal display. 1 Fig. 2 is an enlarged view of a portion of the outer peripheral region of Fig. 1. Fig. 3 is a schematic view of a liquid crystal display in a preferred embodiment of the present invention. Figure 4 is an enlarged schematic view of the local area of the outer perimeter area in Figure 2. DESCRIPTION OF SYMBOLS 10 Liquid crystal display 12 Display panel 14 Control circuit 16 Data line drive circuit 18 Scan line drive circuit 2 2 Data line 2 4 Scan line 2 6 Alizarin circuit 2 8 Peripheral area 3 2 Test pad 110 Liquid crystal display 112 Display Panel 11 4 Control circuit 116 Data line drive circuit 118 Scan line drive circuit 1 2 2 Data line 1 2 4 Scan line 126 Picture circuit 128 Peripheral area 130 Photosensitive element 132 Test pad

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Claims (1)

1280434 6. Patent application scope 1. A display panel comprising: a substrate; a plurality of data lines disposed on the substrate to drive the display panel for image display; at least one test pad is disposed on the substrate; The photosensitive elements are disposed on the substrate, one side of each of the photosensitive elements is connected to the data line, and the other side is electrically connected to the test pad; wherein when the photosensitive element is exposed to light of a certain intensity, the photosensitive element The component will be in an on state, and the data line and the test pad are electrically connected to each other to perform circuit test on the data line via the test, and when the photosensitive element is not exposed to light, the photosensitive element is switched to the off state. So that each of the data lines normally drives the display panel for display operation. 2. The display panel of claim 1, wherein the display panel further comprises a plurality of pixels and a plurality of pixel circuits respectively corresponding to the respective pixels, wherein the pixel circuits are electrically connected to the data a line for driving the respective pixels to perform image display using the data line. 3. For the display panel of claim 2, the image displayed by the pixel is composed of red, blue and green. 4. The display panel of claim 3, wherein the display panel comprises at least three test pads to respectively display red, blue, and green Page 14 1280434 VI. Test the scope of the patent application for testing. 5. The display panel of claim 4, wherein each of the data lines is electrically connected to the corresponding test 依 according to the color displayed by the driven element. 6. The display panel of claim 1, wherein the photosensitive member is a semiconductor film. Membrane body guide half of the board surface of the item 3 is shown in the 0th circumference of the island, the fragmentation of the crystal is not a request, such as the inclusion of 7 packs 8: as shown in the patent application scope 1, the display panel It is a liquid crystal display panel or an organic light emitting display panel. 9. The display panel of claim 1, wherein the display panel further comprises an outer frame enclosing the substrate and shielding the photosensitive element to perform normal display operation of the display panel. Page 15