Samsung Electronics Co., Ltd.

Woon-yong Park

Dong-gyu Kim

Byoung-Sun Na

Jong-Soo Yoon

Kyung-seop Kim

Chang-Oh Jeong

Won-Hee Lee

Jung-Hee Lee

Kyung-nam Lee

Shi-yual Kim

Jun-Ho Song

Dong-Kyu Kim

Won-hee Lee

Kyeong-Nam Lee

Yong-guk Pae

Jong-in Jeung

Hun-seok Nam

A liquid crystal display (LCD) panel includes a substrate, a plurality of parallel control lines on the substrate, and a bonding pad area on the substrate having a plurality of bonding pads therein. A respective one of a plurality of interconnecting conductors connect a respective bonding pad of the bonding pad area to a respective one of the plurality of parallel control lines, each of the plurality of interconnecting conductors having a uniform resistance. According to embodiments of the invention, an interconnecting conductor of the plurality of interconnecting conductors may include a material selected to provide the uniform resistance. The interconnecting conductor may include a first portion including a first material having a first resistivity and a second portion including a second material having a second resistivity different from the first resistivity. The first and second portions may have respective first and second lengths selected to provide the uniform resistance. According to other embodiments, an interconnecting conductor of the plurality of interconnecting conductors may have a width selected to provide the uniform resistance. In one embodiment, the plurality of interconnecting conductors have a resistivity per unit length associated therewith and extend from the bonding pad area in a fanned configuration, with the resistivity of the interconnecting conductors increasing toward a medial portion of the fanned configuration. The width of the interconnecting conductors may decrease towards the medial portion of the fanned configuration to produce the desired resistivity. According to other embodiments, an interconnecting conductor of the plurality of interconnecting conductors has a length selected to provide the uniform resistance. In one embodiment, the interconnecting conductor has a serpentine portion to provide the desired length.

Liquid crystal display panels having control lines with uniform resistance

A thin film transistor substrate for a liquid crystal display includes an insulating substrate, and a gate line assembly formed on the substrate. The gate line assembly has a double-layered structure with a lower layer exhibiting good contact characteristics with respect to indium tin oxide, and an upper layer exhibiting low resistance characteristics. A gate insulating layer, a semiconductor layer, a contact layer, and first and second data line layers are sequentially deposited onto the substrate with the gate line assembly. The first and second data line layers are patterned to form a data line assembly, and the contact layer is etched through the pattern of the data line assembly such that the contact layer has the same pattern as the data line assembly. A passivation layer is deposited onto the data line assembly, and a photoresist pattern is formed on the passivation layer by using a mask of different light transmissties mainly at a display area and a peripheral area. The passivation layer and the underlying layers are etched through the photoresist pattern to form a semiconductor pattern and contact windows. A pixel electrode, a supplemental gate pad and a supplemental data pad are then formed of indium tin oxide or indium zinc oxide. The gate and data line assemblies may be formed with a single layered structure. A black matrix and a color filter may be formed at the structured substrate before forming the pixel electrode, and an opening portion may be formed between the pixel electrode and the data line to prevent possible short circuits.

Thin film transistor array substrate for a liquid crystal display

An ITO (indium tin oxide) layer and a negative photoresist are deposited sequentially on the substrate 100 having a gate wire, a storage wire, a data wire and a storage electrode. The negative photoresist is developed through front exposure and the ITO layer is etched to form a pixel electrode. Because the portions of negative photoresist exposed to light remain after development, pixel defects due to particles placed between pixel regions are reduced. Both the rear exposure and the front exposure may be used. In the rear exposure, it is difficult to remain the portions of the ITO layer at the positions corresponding to the contact portion of the drain electrode and the pixel electrode, the storage line, the gate pads and the data pads. Accordingly, the front exposure is then executed by using the first mask having openings thereon. The negative photoresist is developed, and the ITO layer is patterned. After etching the ITO layer, because the portion of the ITO layer outside the display region remains as a whole, the portions of the ITO layers on the gate pads and the data pads remains through front exposure using a positive photoresist.

Manufacturing methods of liquid crystal displays

An ITO (indium tin oxide) layer and a negative photoresist are deposited sequentially on the substrate 100 having a gate wire, a storage wire, a data wire and a storage electrode. The negative photoresist is developed through front exposure and the ITO layer is etched to form a pixel electrode. Because the portions of negative photoresist exposed to light remain after development, pixel defects due to particles placed between pixel regions are reduced. Both the rear exposure and the front exposure may be used. In the rear exposure, it is difficult to remain the portions of the ITO layer at the positions corresponding to the contact portion of the drain electrode and the pixel electrode, the storage line, the gate pads and the data pads. Accordingly, the front exposure is then executed by using the first mask having openings thereon. The negative photoresist is developed, and the ITO layer is patterned. After etching the ITO layer, bemuse the portion of the ITO layer outside the display region remains as a whole, the portions of the ITO layers on the gate pads and the data pads remains through front exposure using a positive photoresist.

A matrix-type display device having a repair layout, particularly, a matrix-type display device which can be repaired in a pixel unit, is provided. Two or more of signal lines such as scanning signal lines, displaying signal lines and auxiliary signal lines and a pixel electrode are overlapped via an insulating layer, so that a defect such as the disconnection of the displaying signal lines and scanning signal lines, the short of the pixel electrode and signal line, and the loss of electrode of a switching element, can be repaired. Here, the layout of the auxiliary gate line and dual gate line can be modified.

Matrix-type display device capable of being repaired in pixel unit

A method for manufacturing a thin film transistor array panel for a liquid crystal display is disclosed. The present invention enables to manufacture a thin film transistor array panel in lesser steps than the conventional method by fabricating certain film layers on the panel in one photolithography process. For this purpose, a mask that has parts of different light transmittance is used to fabricate multiple film layers in one photolithography process. The method according to the present invention can increase the productivity and yield by reducing the number of photolithography steps, which are expensive and time consuming.

Thin film transistor array panels for a liquid crystal display and a method for manufacturing the same

A gate wire including a gate line, a gate electrode and a gate pad, and a common signal wire including a plurality of common electrodes and a common signal line connecting the common electrodes are formed on a substrate. A first data pattern including a first data line defining a pixel region along with the gate line, a source and drain electrode, a first data pad and a pixel wire parallel to the common electrodes is formed on a gate insulating layer covering the gate wire and the common signal wire. A second data pattern including a second data line, a second data pad and a supplementary gate pad, which are connected to the first data line, the first data pad and the gate pad respectively through contact holes formed in a passivation layer, is on the passivation layer. Here, the first or the second data line and the common electrodes adjacent thereto overlap each other to prevent the light leakage near the edges of the pixel region and to increase the aperture ratio of the LCD. The data pattern may have a double-layered structure in order to prevent its disconnections, and the short between the data pattern and the common electrodes adjacent to the second data line is reduced by disposing the gate insulating layer and the passivation layer therebetween. The upper layer of the first or the second data pad and the supplementary gate pad are made of either chromium, molybdenum, molybdenum alloy or ITO to improve the high reliability of the contact property.

Liquid crystal displays having common electrode overlap with one or more

LCD displays include a substrate, spaced apart data lines on the substrate, and spaced apart gate lines on the substrate that intersect the spaced apart data lines to define an array of display elements. A display electrode and a reference electrode are provided in each display element. The display electrode includes display electrode fingers. The reference electrode includes reference electrode fingers that are spaced apart from the display electrode fingers. A reference electrode line extends across multiple display elements parallel to the reference electrode fingers, and electrically connects the reference electrodes in multiple display elements. Preferably, the display electrode fingers and the reference electrode fingers are symmetrically arranged about the reference electrode line in a display element. More preferably, the reference electrode line extends across a display element at the center thereof.

Liquid crystal displays including reference electrode lines that extend

Flat panel display devices having improved signal line repair capability utilize repair lines which have reduced parasitic capacitance with other active signal lines when connected to provide a repair function. This reduced parasitic capacitance is a result of a reduced number of overlaps between active signal lines (or other repair lines) and each repair line performing a repair function. A main repair line is provided on a display substrate to provide a repair function in the event one of the signal lines is defective. If a repair function is needed because a data line is defective (e.g., 'opened'), this main repair line is electrically connected to a first end of the defective data line and indirectly electrically connected to a second end of the defective data line. The indirect electrical connection is provided by a sub-repair line, which can be electrically connected (i.e., 'shorted') to the main repair line, and a data line extension which is electrically connected to a second end of the defective data line and the sub-repair line. To further reduce parasitic capacitance caused by overlaps between wiring patterns, the main repair line and data line extension are provided at a first wiring level and the data line and sub-repair line are provided at a second wiring level.

Flat panel display devices having improved signal line repair capability

Repair lines for liquid crystal or other flat panel displays are provided as closed loops by utilizing a second substrate and at least one third substrate between the liquid crystal display thin film transistor substrate and the second substrate. By using closed loop repair lines, more than one data line can be repaired using a single repair line. Moreover, the resistance and/or capacitance may be decreased by using a shorter path than may be the case for an open loop repair line.

Liquid crystal displays including closed loop repair lines and methods

Liquid crystal display panels having control lines with uniforms

A matrix-type display capable of being repaired by pixel unit, Two or more of signal lines such as scanning lines, image signal lines and auxiliary signal lines and a pixel electrode are overlapped via an insulating layer, so that a defect such as the disconnection of the image signal lines and scanning lines, the short of the pixel electrode and the signal line, and the loss of electrode of a switching element, and a pixel defect can be repaired. Here, the layout of the auxiliary gate line and dual gate line can be modified.

Matrix-type display capable of being repaired by pixel unit and a repair

A conductive light shading film of a liquid crystal display is electrically connected to a pixel electrode. By connecting the light shading film to the pixel electrode, the light shading film will have the same voltage as the pixel electrode, and can thereby reduce parasitic capacitance and voltage variations on the pixels. The light shading film preferably includes a plurality of conductive light shading lines. The conductive light shading lines can be formed from the same patterned conductive layer as the gate lines or the data lines. Contact holes in insulating layers are used to electrically contact the conductive light shading lines to the pixel electrodes.

Growing community of inventors

Kyungki-do, South Korea

Woon-yong Park