TWI301219B - Liquid crystal display device - Google Patents

Description

The invention relates to a liquid crystal display device, and more particularly to a thin film transistor liquid crystal display (TFT-LCD) having a scanning line end having Signal test device. [Prior Art] Advances in electronic technology, especially in the daily life of portable electronic products, have become increasingly demanding for thin, low-power, low-power displays. Liquid crystal displays (LCDs) are often used in such electronic products due to their advantages of low power consumption, low heat generation, light weight, and non-illuminated displays, and even gradually replace conventional cathodes. Ray. Tube display. For example, the liquid crystal panel of active matrix type has two transparent substrates that are disposed through a liquid crystal layer facing each other, one of which is on the main surface of the liquid crystal side, and has a matrix configuration. a pixel electrode and a thin film transistor disposed adjacent to the pixel electrode, the substrate is generally referred to as a thin film transistor substrate (ThinFilm

Transistor Substrate; TFT Substrate) The liquid crystal display further forms a set of conductive layers prepared by scanning the signal lines for applying a voltage to the gate electrodes of the thin film transistors of each column, and another set of A conductor layer formed by the image signal line is used to pass a signal through the thin film transistor to the pixel electrode of each row. Referring now to Figure 1, there is shown a typical prior art liquid crystal P01-026-TW, 1301219 display thin film transistor substrate 10. The substrate 10 generally has two sets of vertically interleaved scanning signal lines 12 and image signal lines 14 respectively connected to the thin film transistors arranged in the matrix. The scanning signal line 丨2 and the image signal line 14 respectively have signal input ports 16, 18 for inputting scanning signals and image signals. In fact, referring to FIG. 2, the signal waveform (VID) input to the scanning signal line 12 will be affected by the optical component of the thin film transistor substrate 10 connected to the scanning signal line 12, and attenuated. For the signal waveform Vga. When the input waveform vd of the image signal line μ is combined, the reaction time of the pixel electrode is caused to have a time difference ΔT. If the time difference ΔT exceeds a predetermined value, the display of the liquid crystal display may be uneven, and even affect the stability of the liquid crystal display. U.S. Patent No. 5,530,568, "Matrix Liquid Crystal, Display Device Having Testing Pads Of Transparent Conductive Film", issued May 25, 1996, to Yamam. , which discloses a test pad for testing the correct connection of the scan signal line. U.S. Patent No. 5,790,212, issued to Lim, on August 4, 1998, a thin film transistor liquid crystal display having a test pad (Thin Film)

Transistor-Liquid Crystal Display Having Testing Pads),, discloses a test pad for testing the waveform of a common electrode of the liquid crystal display device to enhance enamel. As previously mentioned, the prior art does not disclose a suitable means for testing the signal attenuation of the scanned signal line. Therefore, there is a need to provide a device of the appropriate P01-026-TW 6 1301219 for testing the attenuation of the scanning signal to improve the quality of the liquid crystal display and the stability of the display. SUMMARY OF THE INVENTION A primary object of the present invention is to provide a liquid crystal display device having a scan signal line test pad that can be used to test the clothing reduction of the tracing tiger input to the scan signal line. A secondary object of the present invention is to provide a liquid crystal display device having a scan signal line test pad, and the test pad is connected to a test pad of an output bonding (0LB) area for testing The scan signal. In order to achieve the above object, the present invention provides a liquid crystal display device comprising: a liquid crystal display panel having a liquid crystal disposed on an upper transparent substrate and a transparent substrate; and a plurality of scanning lines arranged side by side under the book. a top surface of the substrate; a plurality of data lines are on the upper surface of the lower transparent substrate and are perpendicular to the plurality of scan lines; and a test pad is located on the upper surface of the lower transparent substrate; The first end of the line is located on the first side of the transparent substrate, and has a shoulder: a signal pad for inputting a scanning signal, and the second end of the scanning line is terminated on the transparent substrate. The second side opposite the first side and at least the second end of the scan line are electrically connected to the test interface. Lu Wei is Kangben's "another view of the liquid crystal display device, in which the scanning line is composed of a first metal, the data line is composed of, and the at least - m road - metal private city, step one% The connection pad is electrically connected to the test pad by one of the wires.

P01-026-TW 1301219 A liquid crystal display device according to still another aspect of the present invention, wherein the at least::sweep: the second end of the line has an overlapping portion with the connecting line, and the 4, the edge layer, a liquid crystal display device according to still another aspect of the present invention, which is electrically coupled to a second end of the scan line by laser welding, wherein the connection The laser welding is cut off. According to another aspect of the present invention, in the liquid crystal display device, the test pad is located at an output end of the liquid crystal display panel and is connected to a bonding, 〇 lb) region. According to still another aspect of the present invention, in the liquid crystal display device, the data line has a plurality of signal pads disposed on a third side of the transparent substrate for inputting a data signal, and the test pad is One of the signal pads. The above and other objects, features, and advantages of the present invention will become more apparent from the <RTIgt; [Embodiment] Referring now to Figure 3, there is shown a thin film transistor substrate 5 of a liquid crystal display according to a preferred embodiment of the present invention, which is substantially identical to the substrate 10 of the prior art shown in Fig. i. The substrate 50 generally has two sets of vertical father-corrected analog lines 52 and image signal lines 54 respectively connected to the matrix-configured thin film transistors. The scanning signal line 52 and the image signal line 54 respectively have signal input pads 56 and 58 for inputting scanning signals and image signals. P01-026-TW 8 1301219 The substrate 50 further has a connection line 6〇 electrically connected to one of the scan signal lines 52a, and the connection line 6〇 has a test pad 61. When the output end of the substrate is connected (〇utlead b〇ndi%, when the scan signal is input from the input pad 5 of the scan signal line 52a, the test pad 61 can be used to know the attenuation of the scan signal. Therefore, the accuracy of the configuration of the thin film transistor and the manufacturing process of the substrate 50 can be confirmed, and it can be further known that the circuit design on the substrate 5 is good or not, so as to modify the process and design. In the manufacturing process of the thin film transistor substrate, the scanning signal line 52, the image signal line 54, the thin film transistor, and the pixel electrode are usually formed by a plurality of mask processes. The 52 is formed by a first metal layer, and the image signal line 54 is formed by a first metal layer having a layer of insulating material between the first and second metal layers. Referring now to FIG. 4, the display is shown. In a preferred embodiment of the present invention, the scanning signal lines 52, 52a are formed by the first metal layer, and the connecting line 6〇 and its test are shown in the preferred embodiment of the present invention. The pad 61 is formed by the second metal layer. The end of the scanning signal line 52a has a contact 66. The end of the connecting wire 60 has a contact 64 between the insulating layer. If necessary, The contact 64 can be connected to the contact 66 by laser welding processing, thereby electrically connecting the scan signal line 52.a to the connection line 6〇. Conversely, The connection line 6 is cut by the laser weiding process. Referring now to Figure 5, there is shown another embodiment in accordance with the present invention.

P01-026-TW 9 1301219 The substrate 50 has a partially enlarged view of a connecting line 80. The scanning signal lines 52, 52a are formed by the first metal layer, and the connecting line 8 is connected to the wheel-in connection pad 58 of the video line 5 4, and both are The second metal layer is formed. The end of the scanning signal line 52a has a contact 66 having a contact 86 at the end thereof with the insulating layer interposed therebetween. As described above, if necessary, the contact 86 can be connected to the contact 66 by laser welding and i, thereby electrically connecting the scan signal line 52a to the connection line 8. Hey. Conversely, the connecting line 8 can also be cut by the laser welding process. In this configuration, since the thin film transistor substrate has the connection line and the rib pad, the test pad can be used to detect the attenuation of the scan signal on the scan signal line. Therefore, the accuracy of the configuration of the thin film transistor and the substrate manufacturing process can be confirmed, and it is further known whether the circuit on the substrate is good or not, so as to modify the process and design, and improve the quality and display of the liquid crystal display. Stability. While the present invention has been described in its preferred embodiments, it is not intended to limit the scope of the invention, and various modifications and changes can be made without departing from the spirit and scope of the invention. Therefore, the scope of protection of the present invention is defined by the scope of the appended claims.

P01-026-TW 10 1301219 [Simple description of the diagram] 貘 Display of the thin 貘 transistor substrate Figure 1: is a schematic diagram of the liquid upper plane of the prior art. Fig. 2 is a thin film transistor type 曰- 4 4 % Λ 日 日 扫描 扫描 扫描 扫描 扫描 扫描 扫描 扫描 扫描 扫描 扫描 扫描 扫描 扫描 扫描 扫描 扫描 扫描 扫描 扫描 扫描 扫描 扫描 扫描 扫描 扫描Fig. 3 is a plan view showing the upper surface of a germanium crystal substrate of a liquid crystal display according to a preferred embodiment of the present invention. Fig. 4 is a partially enlarged schematic view showing the thin film transistor substrate of the preferred embodiment of Fig. 3. Fig. 5 is a partially enlarged schematic view showing a thin film transistor substrate of a liquid crystal display according to another preferred embodiment of the present invention. [Main component symbol description] 10 LCD wafer substrate 12 Scanning signal line 14 Video signal line 16 Signal input pad 18 Signal input pad 50 LCD film substrate 52 Scanning signal line 52a Scanning signal line 54 Image Signal line 56 Signal input pad 58 Signal input pad 60 Connection line 61 Test interface 64 Contact 66 Contact 80 Connection line P01-026-TW 11 1301219 86 Contact

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Claims (1)

It is the annual production of Μ El repair (image) 正 4: Ten, the scope of application for patents: — 1, a liquid crystal display device, comprising: a liquid crystal display panel, having a liquid crystal disposed on a transparent substrate and a transparent substrate a plurality of scan lines (scan Hnes) are arranged side by side on the upper surface of the lower transparent substrate; a plurality of data lines are arranged side by side on the surface of the lower transparent substrate and are vertically interlaced with the plurality of scan lines; The test pad is located on the upper surface of the lower transparent substrate; wherein the first end of the scan line is located on a first side of the transparent substrate, and has a plurality of signal pads for inputting a scan signal, the scan The second end of the line terminates on the transparent substrate and is opposite to the first side, at least one side of the second side of the line, and the second end of the scanning line is electrically connected to the test pad. [1] The liquid crystal display device of claim 1, wherein the at least two ends have an overlapping portion with the connecting line, and the electrical connection is electrically connected by laser welding 2, and the first scanning line according to the patent application scope The two rooms have an insulating layer, and the second end of the sweep &amp; line is connected to the connecting line by P01-026-TW 13 1301219. 3. The liquid crystal display device of claim 2, wherein the connection line is cut for the laser welding. 4. The liquid crystal display device according to claim 1, wherein the test pad is located at an output of the liquid crystal display panel (〇 lea d bonding 。 。). 5. The liquid crystal display device of claim 1, wherein the data line has a plurality of signal pads disposed on a third side of the transparent substrate for inputting a data signal, and the test pad is One of the signal pads. P01-026-TW 14