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Liquid crystal display deviceLiquid crystal display device description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20060192737, Liquid crystal display device. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS REFERENCE TO RELATED APPLICATION [0001] This application is a continuation application of U.S. application Ser. No. 09/905,911, filed Jul. 17, 2001, the contents of which are incorporated herein by reference. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates in general to liquid crystal display devices and, in more particular, to a technique usefully applicable to an image signal drive unit (drain driver or drivers) of a liquid crystal display device with multilevel gradation/tone display abilities. [0004] 2. Description of the Related Art [0005] Liquid crystal display devices of the active matrix type having an active element (e.g. thin-film transistor) on a per-pixel basis and driving this active element to perform a switching operation have widely been employed as the display device of a notebook personal computer or the like. [0006] These active-matrix liquid crystal display (AMLCD) devices are such that due to application of an image signal voltage (gradation/tone voltage corresponding to display data, as will be referred to as gradation/tone voltage hereinafter) to a pixel electrode via such active element, any cross-talk is absent between respective pixel and thus, it is no longer necessary to employ "special" driving methods for prevention of crosstalk unlike simple-liquid crystal display devices, thereby enabling successful achievement of multi-gradation-level or "gray-scale" display abilities. [0007] As one of the active-matrix liquid crystal display devices, there is known a TFT liquid crystal display module, which comprises a liquid crystal display panel of the thin-film transistor (TFT) scheme, also called TFT-LCD panel, drain drivers as disposed on the upper side of the liquid crystal display panel, and gate drivers and an interface section as disposed along side faces of the liquid crystal display panel. [0008] FIG. 24 is a block diagram showing a schematic configuration of one example of related art TFT liquid crystal display module. [0009] As shown in FIG. 24, a plurality of drain drivers 130 are disposed along a long edge side of the liquid crystal display panel (TFT-LCD) 10 whereas a plurality of gate drivers 140 are laid out along a short edge side of the liquid crystal display panel 10. [0010] Control signals that are output from a host computer side such as a personal computer and consist essentially of display data (image signal) of three primary colors of red (R), green (G) and blue (B), a clock signal(s), a display timing signal(s), and synchronization signals (horizontal sync signal and vertical sync signal) are input to a display control device (TFT controller) 110 via an interface connector. [0011] A control signal(s) and display data and the like from the display control device 110 are input to each drain driver 130 via a TFT controller substrate 301 and drain driver substrate 302. [0012] In addition, the control signal(s) from the display control device 110 will be input to each gate driver 140 through the TFT controller substrate 301 and a gate driver substrate 303. [0013] Note that depiction of a wiring layer(s) on or over the TFT controller substrate is eliminated in FIG. 24. [0014] Also note that although more than one wiring layer other than the wiring layer shown in FIG. 24 is also provided on the drain driver substrate and gate driver substrate, only four lines of wiring layers for the drain driver substrate 302 and only two lines of wiring layers for the gate driver substrate 303 are depicted in FIG. 24. [0015] The drain drivers 130 and gate drivers 140 are constituted from semiconductor chips (ICs), wherein these semiconductor chips (ICs) are mounted on a film substrate by either the so-called tape carrier techniques or chip-on-film techniques. [0016] As shown in FIG. 25 a wiring layer (COFA) is formed on the film substrate 310 from the periphery, wherein terminals (BUMP) being provided at the periphery of semiconductor chip (IC) are coupled by bonding to this wiring layer (COFA). [0017] Here, drain driver terminals (BUMP) are typically provided along the peripheral portions thereof, one example of which is shown in FIG. 26. [0018] As shown in FIG. 26, input terminals (BUMP2) are disposed along one side for enabling connection of wiring leads from the drain driver substrate 302 whereas output terminals (BUMP1) are disposed at either the remaining three sides or four peripheral portions including right and left spaces of a side along which the input terminals (BUMP2) are disposed. [0019] Additionally output circuits 330 within the drain drivers corresponding to respective output terminals (BUMP1) are typically laid out into a linear array in a way identical to output terminal positions. [0020] Note that such liquid crystal display device has been recited, for example, in Japanese Patent Laid-Open No. 281930/1997. [0021] In recent years, in liquid crystal display devices such as TFT liquid crystal display modules, with the increasing demand for larger display screen sizes of liquid crystal display panels, they are in the tendency toward increase in pixel number of a liquid crystal display panel and also requirement for achievement of higher precision; and, in accordance therewith, gate signal lines and drain signal lines also increase in number resulting in a likewise increase in input/output terminal number of the drain drivers. [0022] For instance, with an XGA-format liquid crystal display panel, the requisite number of drain signal lines is 3,072(=1,024.times.3 (RGB)). Assuming that drain drivers with 384 output terminals are used, the required number of drain drivers in the XGA-LCD panel becomes as large as 8(=3,072/384). Continue reading about Liquid crystal display device... Full patent description for Liquid crystal display device Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Liquid crystal display device patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Liquid crystal display device or other areas of interest. ### Previous Patent Application: Information processing apparatus and its control method Next Patent Application: Liquid crystal display device and manufacturing method thereof Industry Class: Computer graphics processing, operator interface processing, and selective visual display systems ### FreshPatents.com Support Thank you for viewing the Liquid crystal display device patent info. 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