Electronic apparatus

Abstract: In a liquid crystal display apparatus (30), in order to reduce the size and weight, an integrated circuit (23) for driving the liquid crystal is mounted on the glass substrate (12, 22) composing the liquid crystal panel either directly or by way of a tape carrier or the like. That is, two glass substrates (12, 22) of liquid crystal panel are mutually overlapped with an offset, and a liquid crystal material (27) or the like is injected into the overlapping regions (31) of the two glass substrates (12, 22), and liquid crystal display is effected in this region (31). Besides, in the non-overlapping region (A2, A3) of the two glass substrates (12, 22), the integrated circuit (23) is connected either directly or by way of a tape carrier or the like (16). On the glass substrates (12, 22), electrodes for varying the optical characteristics of the liquid crystals are provided, and the integrated circuit (23) drives the liquid crystal (20) by controlling the voltage applied to the electrodes (18, 28). On the electrodes (18, 28), usually, transparent insulation films (11a, 21) are formed. According to the invention, the transparent insulation films (11, 11a) are also formed in the non-overlapping region (A2, A3) of the glass substrates (12, 22). Since the transparent insulation films (11, 11a, 21) are finely patterned by photolithography they may be selectively formed on the portions where defective insulation is likely to occur between the conductors (18, 28) following the integrated circuit from the electrodes, or between the integrated circuit and the peripheral portion of the connecting part.

Description: The present invention relates to display apparatus such as a liquid crystal display device, and more particularly possessing a structure in which an integrated circuit is connected to, for example, a glass substrate of a display panel. Hitherto, in order to realize reduction of size and lowering of cost of a liquid crystal display device, it has been known to connect a tape carrier to which an integrated circuit for driving the liquid crystal directly is attached to a glass substrate composing the display panel. FIG. 1 is a sectional view showing the structure near a tape carrier 6 of a liquid crystal display device in a typical prior art. Two glass substrates composing the liquid crystal panel are overlapped with an offset. Therefore, one glass substrate 2 possesses a region not overlapping with the other glass substrate. In this region, the tape carrier 6, to which an integrated circuit (not shown) or the like for driving the liquid crystal is attached, is connected. In the overlapping region of the two glass substrates, liquid crystal material or the like is sealed between the two substrates, so as to effect liquid crystal display in this region. On the surface of the glass substrate 2, a common conductor 4 for carrying an input signal is disposed. On the surface of the tape carrier 6 confronting the glass substrate 2, an input signal conductor 3 and a connecting conductor 7 are formed. This connecting conductor 7 is connected to the common conductor 4 by way of an anisotropic conductive film 5. In such a connection structure, in the region indicated by reference A1 in FIG. 1, the input signal conductor 3 on the tape carrier 6 and the common conductor 4 formed on the glass substrate 2 cross over to form a multilayer conductor structure. Conventionally, to prevent short-circuit of the input signal conductor 3 and the common conductor 4, a resist 1 such as an electrically insulating resin is applied on the input signal conductor 3. By this resist 1, the input signal conductor 3 on the tape carrier 6 and the common conductor 4 on the glass substrate 2 are insulated from each other. In such prior art, the tape carrier 6 is deformed in the region indicated by reference A1. Such deformation of the tape carrier 6 is considered to be caused due to the relatively large thickness of the resist 1, and the difference between the thermal expansion coefficients of the resist 1 and the tape carrier 6. By such deformation of the tape carrier 6, a stress is caused in the connection part of the common conductor 4 and the connecting conductor 7, which may result in defective connection or the like. The conductor from the tape carrier 6 to the display region is formed on the surface of the glass substrate 2. In such a conductor layout area, it is necessary to arrange conductors at high density by narrowing the conductor clearances. However, if the spacing between conductors is too narrow, due to dew condensation of moisture defective insulation occurs, and hence there is a limit to the miniaturization of wiring conductors. In addition, in the narrow conductor spacing area, defective insulation due to foreign deposit may also take place. Meanwhile, in the face-down bonding method of directly connecting the integrated circuit to the glass substrate, the above technical problems are not sclved. In this case, moreover, positioning of high precision is required in connecting the integrated circuit to the glass substrate. That is, where the conductor interval is narrow in the connecting part, a slight dislocation may give rise to short-circuit or leak between the connecting electrode of the integrated circuit and the conductor adjacent to the connecting position of the glass substrate. Furthermore, in the case of connection of the integrated circuit directly to the glass substrate, when a conductive paste is used as the connecting material, this conductive paste may be spread widely unexpectedly when connecting, which may also lead to short-circuit or leak between the adjoining conductors. From JP-A-63-55526, it is known, in a liquid crystal display device, to form a protective insulating film which covers wiring exclusively in an LSI chip-connection region of a substrate thereof, outside the display region. This document also teaches the formation of a polyimide film which covers wiring in the display region and at the periphery of a chip-connection region. It is hence a primary object of the invention to provide a display apparatus capable of forming conductors finely by enhancing the insulation performance between conductors on a substrate to which an integrated circuit component is connected, and between the conductor and a connecting electrode of the integrated circuit which are intended to be insulated from each other. In one aspect, the invention provides display apparatus comprising: a first electrically insulating substrate having a first region in which a display panel is formed by an overlapping second electrically insulating substrate, and a second region where said substrates do not overlap each other; conductors formed on said first substrate and extending mutually parallel from said first region, where they form part of said display panel, to said second region, where they terminate in respective connection electrodes; an integrated circuit component, for driving said display panel, mounted face-down on said first substrate in said second region, said integrated circuit component having bonding electrodes respectively electrically connected to said connection electrodes in the area beneath said integrated circuit component; and an electrically insulating layer formed over said conductors, said insulating layer extending over said first region and said second region, including said area of the second region which is covered by said integrated circuit component, except at said connection electrodes where the insulating layer exposes the whole of each connection electrode by terminating spaced from the periphery of the connection electrode; said connection electrodes being distributed within said area in a regular array in which they occupy the body and the periphery of said area. The connection electrodes may be aligned in lines parallel to the direction in which the conductors extend from said first region to said second region. Preferably, a sealing resin fills the gap between said integrated circuit component and said first substrate. In another aspect, the invention provides display apparatus comprising: a first electrically insulating substrate having a first region in which a display panel is formed by an overlapping second electrically insulating substrate, and a second region where said substrates do not overlap each other; conductors formed on said first substrate and extending mutually parallel from said first region, where they form part of said display panel, to said second region, where they terminate in respective connection electrodes; an integrated circuit component, for driving said display panel, mounted face-down on said first substrate in said second region, said integrated circuit component having bonding electrodes respectively electrically connected to said connection electrodes in the area beneath said integrated circuit component; an electrically insulating layer formed over said conductors, said insulating layer extending over said first region and said second region, except that the insulating layer extends selectively over only said conductors in said area of the second region which is covered by said integrated circuit component; and a sealing resin filling the gap between said integrated circuit component and said first substrate in the whole of said area; said connection electrodes being distributed within said area in a regular array in which they occupy the body and the periphery of said area. In one embodiment, in said area the insulating layer covers substantially the whole of each of said conductors. In another embodiment, in said area the insulating layer is confined to covering portions of said conductors which lie adjacent the connection electrodes of others of said conductors. The connection electrodes may be aligned in lines parallel to the direction in which the conductors extend from said first region to said second region. The electrically insulating layer may comprise SiO 2 or SiN x . A thin layer of this material may be formed preferably by the sputtering method, the CVD method, or another thin layer forming technique. The thin layer may then be patterned using the photolithographic technique. According to the invention, the electrically insulating layer is selectively formed in the region (hereafter "the connection region") other than the display panel-forming region of the substrate, for example by photolithography. The bonding electrodes of the integrated circuit component are connected to the connection electrodes of the conductors on the substrate in the bond region of the conductors free from the electrically insulating layer. Since the insulation performance between the conductors in the connection region is enhanced by the electrically insulating layer for forming the display panel, defective insulation between the conductors may be prevented without complicating the manufacturing process. Thus, according to the invention, the display apparatus may be composed by forming an electrically insulating layer by photolithography on the electrically insulating substrate on which the conductors are formed. At this time, since the electrically insulating layer is selectively formed in the connection region the insulation between the wiring conductors may be enhanced, so that fine and high density formation of the conductors may be realized. Besides, by forming the insulating layer in the non-bonding region between the integrated circuit component and the substrate, it is possible to provide insulation while eliminating the adverse effects on the connection due to the great thickness of the resist as mentioned in relation to the prior art. Furthermore, in the forming process of the electrically insulating layer when composing the display apparatus, the electrically insulating layer can be formed in the region other than the display panel-forming region, so that the manufacturing process of the display apparatus may be simplified. By forming the electrically insulating layer selectively in the connection region, connecting the integrated circuit to the substrate, and injecting an electrically insulating synthetic resin between the integrated circuit and the substrate, the integrated circuit can be connected firmly to the circuit substrate, without worsening the insulating performance between the conductors even when the adhesion between the electrically insulating layer and the synthetic resin is weak. The invention will be better understood and appreciated from the following detailed description of some preferred embodiments with reference to FIGS. 7 to 16 of the drawings, in which: FIG. 1 is a sectional view showing the structure near a tape carrier 6 of a prior art liquid crystal display device; FIG. 2 is a plan view showing the entire structure of a liquid crystal display device 30 useful for an understanding of the invention; FIG. 3 and FIG. 4 are plan view and perspective view showing the structure near a tape carrier 16 of the liquid crystal display device 30; FIG. 5 is a sectional view near the tape carrier 16 of the liquid crystal display device 30; FIG. 6 is a sectional view near the tape carrier 16, cutting off the liquid crystal display device 30 along the common conductor 14 for input signal; FIG. 7 is a plan view showing the connection structure of an integrated circuit 43 to a glass substrate of a liquid crystal display device in one embodiment of the invention; FIG. 8 is a sectional veiw seen from cut-off line VIII-VIII of FIG. 7; FIG. 9 is a sectional view seen from cut-off line IX-IX of FIG. 7; FIG. 10 is a sectional view seen from cut-off line X-X of FIG. 7; FIG. 11 is a plan view showing the structure near an output electrode 34 of the connecting structure shown in FIG. 7; FIG. 12 is a sectional view seen from cut-off line XII-XII of FIG. 11; FIG. 13 is a plan view showing the structure near an output electrode 34a in a connection structure of an embodiment of the invention; FIG. 14 is a sectional view seen from cut-off line XIV-XIV of FIG. 13; and FIG. 15 and FIG. 16 are plan views showing the structure near output electrodes 34b, 34c in further embodiments of the invention. FIG. 2 is a plan view showing the entire structure of a liquid crystal display device 30. The liquid crystal display device 30 is composed by laminating two glass substrates 12, 22 as a pair of substrates. These two glass substrates 12, 22 are overlapped with an offset, and possess regions not overlapping with each other. In these regions, plural integrated circuits 23 for driving the liquid crystal are connected individually through tape carriers 16. The tape carrier 16 is intended to connect the integrated circuit 23 electrically to the glass substrates 12, 22, and it is made of an elastic film. As mentioned later, in the display region 31, intervening between the two glass substrates 12, 22, there are a colour filter, transparent electrodes 18,28, transparent insulation films 11a,21 made of electrically insulating film, orientation films 19,29 and liquid crystal 27 whereby the liquid crystal display is realized. An input signal is supplied from a common conductor 14 for input signal to the integrated circuit 23 through a tape carrier 16. This common conductor 14 for input signal is formed on the surface of the glass substrate 12. The output signal from the integrated circuit 23 is applied to electrode 18 through the tape carrier 16. The electrode 18 is disposed in the region on the glass substrate 12 from the tape carrier 16 to the display region 31. Such structure is similar in the region not overlapping with the glass substrate 12 of the glass substrate 22. The electrodes 18, 28 from the tape carrier 16 compose a matrix by extending longitudinally and laterally in the display region 31, and a two-dimensional display is achieved on the display region 31. In this structure, a transparent insulation layer is formed, as mentioned later, not only in the display region 31 (as indicated by reference 11a in FIG.5), but also in the overlapping region A2 (as indicated by reference 11) with the tape carrier 16 and the exposed region A3 (as 11a) of the electrodes 18, 28. FIG. 3 is a plan view showing the structure near the tape carrier 16 of the liquid crystal display device 30, and FIG. 4 is a perspective view showing this structure. On the surface of the glass substrate 12, the electrode 18 and common conductor 14 for input signal are formed. The common conductor 14 for input signal and electrode 18 formed on the glass substrate 12 are made of, for example, ITO (indium-tin oxide) or other metal film. Furthermore, in the regions A2 and A3 mentioned later, transparent insulation layers are formed. The transparent insulation layers are, for example, SiO 2 and SiN x , and are formed by sputtering method, CVD method or the like in the forming process of liquid crystal panel 20, and fine patterns may be easily formed by photoetching or photolithography. The manufacturing process of this transparent insulation layer is explained below. On the entire surface of the glass substrate 12, on which the electrode 18 and common conductor 14 for input signal are formed, a thin layer of SiO 2 or SiN 2 is formed in a layer thickness of, for example, 3000 Å. Furthermore, a photosetting photo resist is applied on the entire surface, and it is irradiated with light through a mask with desired pattern. Dipping in a solvent in this state, the photo resist which is not cured is dissolved and removed. Moreover, by the wet etching or dry etching method, the portion of SiO 2 or SiN x exposed by the removal of the photo resist is removed. As a result, the SiO 2 or SiN x layer is formed in a pattern, and the remaining photo resist is removed. A transparent insulation layer is formed later. On the other hand, an input signal conductor 13 is formed on the surface of the tape carrier 16 confronting the glass substrate 12, and the input signal conductor 13 and the corresponding common conductor 14 for input signal are electrically connected individually by means of an anisotropic conductive film 15 (see FIG. 3). The tape carrier 16 is composed of, for example, an organic resin film small in thermal expansion coefficient. The input signal conductor 13 and connecting conductor 17 formed on the tape carrier 16 are, for example, made of copper foil, tin foil or tin-plated copper foil, and they can be arranged finely and at high density by applying the techniques of thin film pattern processing or the like. The anisotropic conductive film 15 is composed of, for example, a sheet of about 25 µm in thickness having Ni (nickel particles) of 5 to 20 µm in diameter dispersed therein, and the heated and compressed portion becomes conductive in the compressing direction. This anisotropic conductive film 15 also possesses the function for mechanically connecting the tape carrier 16 and the glass substrate 12. In the region A2 of the overlapped region of such tape carrier 16 to the glass substrate 12, the input signal conductor 13 and the common conductor 14 for input signal are not connected, and a multilayer structure is built up. In the region A3 on the glass substrate 12, the electrode 18 is exposed. In this structure, by the transparent insulation layer 11 formed in the region A2, the insulation of the input signal conductor 13 and the common conductor 14 for input signal is achieved. By the transparent insulation layer 11a formed in the region A3, defective insulation between electrodes 18 due to foreign deposit may be prevented. FIG. 5 is a sectional view of the liquid crystal display device 30, and FIG. 6 is a sectional view near the tape carrier 16 showing the liquid crystal display device 30 cut off along the common conductor 14 for input signal. As stated above, the integrated circuit 23 for driving the liquid crystal is mounted on the tape carrier 16. An output wire 24 from this integrated circuit 23 is bonded to an inner lead by bumps 25, and is individually connected to the input signal conductor 13, and to electrode 18 by way of anisotropic conductive film 15, solder or other connecting material. The display panel 20 positioned at the left side in FIG. 5 is composed by laminating the glass substrate 12 on which a segment electrode 18 is formed, and the glass substrate 22 on which a common electrode 28 is formed. On the glass substrate 12, as mentioned above, colour filter 32 and electrode 18 are formed, and a transparent insulation layer lla is formed on this electrode 18. On the transparent insulation layer lla corresponding to the display region 31 of the display panel 20, an alignment layer 19 is formed. Similarly, on the glass substrate 22, electrode 28, transparent insulation layer 21 and orientation film 29 are formed. The glass substrate 12 and glass substrate 22 are fixed by way of sealing material 26, and a liquid crystal intervenes between the alignment layer 19 and the alignment layer 29. In such display panel 20, a voltage is selectively applied to each picture element between the electrodes 18, 28 by the signal delivered from the integrated circuit 23 to the electrode 18, and the signal led out to the electrode 28, and the optical characteristic of the liquid crystal 27 varies, so that the image display is realized. Hereinafter, referring to FIG. 5 and FIG. 6, the structure near the connecting part of the tape carrier 16 and glass substrate 12 is described in detail. On the common conductor 14 for input signal formed on the glass substrate 12, the transparent insulation layer 11 is formed, in the same process as in the transparent insulation layer 11a, in the region A2, A3 as mentioned above. The region A2 is an area in which the common conductor 14 for input signal and input signal conductor 13 cross over to build up a multilayer conductor structure, and usually in this region A2 a short-circuit between conductors is likely to occur. However, in this structure, since the transparent insulation layer 11 is formed, the short-circuit between the conductors is prevented, and a secure insulation is achieved. In the region other than the region A2, the connecting conductor 17 of the tape carrier 16 and the electrode 18, and the input signal conductor 13 of the tape carrier 16 and the common conductor 14 for input signal are electrically and mechanically connected with each other respectively, by way of the anisotropic conductive film 15. In such a connecting position, the transparent insulation layer 11 is not formed. Thus, in the liquid crystal display device 30, since the transparent insulation layer 11 is formed in the region A2, it is not necessary to apply a resist or the like on the tape carrier as explained in relation to the prior art, and the connecting process of the tape carrier 16 is simplified, and the yield in connection of the tape carrier 16 is enhanced. Moreover, since this transparent insulation layer 11 is a thin film, its thickness is not so great as that of the resist. What is more, since it is not directly adhered to the tape carrier 16, it is free from adverse effects of difference in the thermal expansion coefficient between the tape carrier 16 and the resist. Accordingly, the tape carrier 16 is not deformed in the region A2. Therefore, since stress is not generated in the connecting portion of the input signal conductor 13 and common conductor 14 for input signal, adverse effects on connection are eliminated, and the reliability of connection is enhanced. At this time, the transparent insulation layer 11 is a thin film, and the yield in the connecting process by the anisotropic conductive film 15 is enhanced, so that the cost of the entire apparatus may be lowered at the same time. Furthermore, in the region A3, since the transparent insulation layer 11 is formed, the insulation between the adjoining electrodes 18 is improved, and defective insulation between the electrodes 18 due to dew condensation of moisture may be prevented. At the same time, defective insulation due to foreign deposit is prevented, so that fine patterning and high density of the electrodes 18 may be achieved at the same time. Besides, since such transparent electrode insulation layers 11 can be formed in the fabrication process of the display panel 20, these effects will be realized without complicating the manufacturing process. In the above structure, the transparent insulation layer 11 is formed in the region A2 and the region A3, but it is also possible to form the transparent insulation layer 11 either in the region A2 or A3, or the transparent insulation layer 11 may be also formed in part of such regions or in the portion other than such regions. In such a case, since the transparent insulation layer 11 is patterned at high density by photolithography, the transparent insulation layer 11 may be selectively formed in a desired region, for example, in the region where the defective insulation of the electrode 18 is likely to occur. Or, when the tape carrier is connected to an ordinary printed circuit board comprising common conductor for input signal and this tape carrier is connected to the glass substrate, the transparent insulation layer 11 is preferably formed on the electrode extending from the tape carrier to the display region. Some embodiments of the invention will now be described with reference to FIGS. 7 to 10 and 13 to 16. FIG. 7 is a plan view showing the connection structure of an integrated circuit 43 to a glass substrate 42 in a liquid crystal display device in one embodiment of the invention; FIG. 8 is a sectional view seen from cut-off line VIII-VIII of FIG. 7; FIG. 9 is a sectional view seen from cut-off line IX-IX of FIG. 7; and FIG. 10 is a sectional view seen from cut-off line X-X of FIG. 7. In this embodiment, the integrated circuit 43 is directly connected to the region not overlapping between one glass substrate 42 and the other glass substrate in the liquid crystal display device. In the other glass substrate, similarly, an integrated circuit may be connected. Referring to FIGS. 7 to 10, on one surface of the glass substrate 42, output electrode 34, input electrode 35 and output conductor 33 are formed, for example, in the same process together with the picture element electrode or scanning electrode in the liquid crystal display device. Such electrodes are selectively formed by, for example, photolithography, and are composed of ITO or other metal thin film. On the glass substrate 42, furthermore, a transparent insulation film 41 is formed as an electrically insulating film. This transparent insulation layer 41 is, the same as in the foregoing structure, for example, SiO 2 or SiN x , and is formed in a film by sputtering method, CVD method or the like, and is patterned by photolithography. As shown in FIGS. 8 to 10, the transparent insulation layer 41 is not formed in the regions B1, B2, in which connections are made to the input electrode 35, output electrode 34 and input terminal 36. On the other hand, the integrated circuit 43 has a function for driving the liquid crystal display device, and a bump electrode 37 is formed in order to exchange signals with the outside. This bump electrode 37 is formed by selectively applying a resist by photolithography, and applying copper by electroplating. In a modification, meanwhile, a bump electrode made of gold may be formed in the same way as the fast bond of wire bonding method. This bump electrode 37 is electrically connected in the region B2 in which the output electrode 34 and the input electrode 35 are exposed. Thus, the integrated circuit 43 is electrically connected with the output electrode 34 and the input electrode 35 of the glass substrate 42. As for the connection of the bump electrode 37, and the output electrode 34 or the input electrode 35, for example, a conductive paste may be used, or they may be directly connected by compressing. Otherwise, without forming the bump electrode 37, the integrated circuit and the output electrode 34 and input electrode 35 of the glass substrate 42 may be connected by way of an anisotropic conductive film. After connection of the integrated circuit 43, the operation in this liquid crystal display device is inspected, and in the normal integrated circuit 43, a sealing synthetic resin 38 is injected as shown in FIG. 8. Or, if the integrated circuit is found to be abnormal, it is, for example, removed and an other integrated circuit is connected again. FIG. 11 is a plan view showing the structure near the output electrode 34 in the connecting structure described above, and FIG. 12 is a sectional view seen from cut-off line XII-XII of FIG. 11. In this structure, the transparent insulation layer 41 is formed, overlapping with the output electrode 34 partly in the peripheral part of the output electrode 34. The bump electrode 37 is connected to the exposed region B2 of the output electrode 34. FIG. 13 is a plan view showing the structure near the output electrode 34a of the liquid crystal display device in an embodiment of the invention, and FIG. 14 is a sectional view seen from cutoff line XIV-XIV of FIG. 13. This embodiment differs from the preceding structure in that the output electrode 34a and transparent insulation layer 41a do not overlap. The output conductor 33a which is manufactured in the same process as the output electrode 34a and is extending in the display region from the output electrode 34a is overlapping with the transparent insulation layer 41a. That is, the output conductor 33a is covered with the transparent insulation layer. In such a liquid crystal display device, a flexible printed circuit (FPC) or the like comprising the common conductor for input signal is connected to the region B1 of the input terminal 36, and an input signal from outside is given to this input terminal 36. This input signal is given to the integrated circuit 43 through input electrode 35 and bump electrode 37. Afterwards, in the integrated circuit 43, various signal processings are done, and an output signal according to the input signal is delivered. This output signal is transmitted to the liquid crystal display unit from the bump electrode 37 of the integrated circuit 43 by way of the output electrode 34 and output conductor 33 on the glass substrate 42, so that a two-dimensional display is achieved. Thus, in this embodiment, since the transparent insulation layer 41 is formed on the surface of output conductor 33, the insulation between conductors is enhanced, and leak between conductors and corrosion of conductors may be prevented, and leak of bump electrode 37 and conductor 33 of the integrated circuit 43 due to defective positioning bf the integrated circuit 43 may be prevented. The process of forming the transparent insulation layer 41 is included in the manufacturing process of the liquid crystal panel, and it is conducted simultaneously with the formation of the transparent insulation film in the display region, so that the manufacturing process will not be complicated if the transparent insulation layer is formed in the region to be connected with the integrated circuit 43. Furthermore, according to this embodiment, since the transparent insulation layer 41 is patterned by photo etching, the pattern positioning precision and pattern forming precision are excellent. Therefore, although fine conductors are formed on the glass substrate 42, arbitrary patterns can be formed depending on such fine conductor patterns. Hence, undesired short-circuit of conductors may be prevented. This transparent insulation layer 41 is, for example, SiO 2 or SiN x , but other materials may be equally employed as far as applicable to fine processing of photolithography or the like in the liquid crystal panel forming process. FIG. 15 and FIG. 16 are plan views showing the forming regions of output electrodes 34b, 34c, output conductors 33b, 33c, and transparent insulation layers 41b, 41c formed on the glass substrate opposite to the integrated circuit, according to further embodiments of the invention. In the embodiment shown in FIG. 15, a transparent insulation layer 41b is formed so as to cover the output conductor 33b along the output conductor 33b. According to this embodiment, since the transparent insulation layer 41b is patterned by photolithography, such fine patterns can be formed. FIG. 16 shows a case of forming the transparent insulation layer 41c so as to cover only the portion likely to cause short-circuit or leak with the output electrode 34c in the output conductor 33c existing near the output electrode 34c. In the embodiments shown in FIG. 15 and FIG. 16, even if the adhesion between the synthetic resin injected between the integrated circuit and glass substrate, and the transparent insulation layers 41b, 41c is inferior, the integrated circuit can be connected with a sufficient strength, and the defective insulation mentioned above can be prevented at the same time. Thus, when directly connecting the integrated circuit to the glass substrate of the liquid crystal display device, defective insulation between conductors is prevented in the outer side conductor of the integrated circuit. At the same time, short-circuit and leak due to foreign deposit can be prevented. Therefore, the fine structure and high density of conductors may be achieved simultaneously. Also, in the region overlapping with the integrated circuit of the glass substrate, short-circuit or leak of the connecting electrode and conductor due to deviation of positioning of the integrated circuit, and short-circuit between adjoining conductors due to excessive spreading of the conductive paste when conductive paste is used can be prevented. Furthermore, since such transparent insulation layer can be formed in the manufacturing process of the display panel, such effects are realized without complicating the manufacturing process. Herein, embodiments of the invention in the liquid crystal display device are described, but this invention may be also embodied in other display devices, such as plasma display device, electroluminescence display device, and electrochromic display device. The invention may be embodied in other specific forms without departing from the essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description and all changes which come within the meaning and the range of equivalency of the claims are therefore intended to be embraced therein. There are described above novel features which the skilled man will appreciate give rise to advantages.

Claims: Display apparatus comprising: a first electrically insulating substrate (42) having a first region in which a display panel is formed by an overlapping second electrically insulating substrate, and a second region where said substrates do not overlap each other; conductors (33b; 33c) formed on said first substrate (42) and extending mutually parallel from said first region, where they form part of said display panel, to said second region, where they terminate in respective connection electrodes (34b; 34c); an integrated circuit component (43), for driving said display panel, mounted face-down on said first substrate (42) in said second region, said integrated circuit component (43) having bonding electrodes (37) respectively electrically connected to said connection electrodes (34b; 34c) in the area beneath said integrated circuit component (43); an electrically insulating layer (41b; 41c) formed over said conductors (33b; 33c), said insulating layer extending over said first region and said second region, except that the insulating layer (41b; 41c) extends selectively over only said conductors (33b; 33c) in said area of the second region which is covered by said integrated circuit component (43); and a sealing resin (38) filling the gap between said integrated circuit component (43) and said first substrate (42) in the whole of said area; said connection electrodes (34b; 34c) being distributed within said area in a regular array in which they occupy the body and the periphery of said area. Display apparatus according to claim 1, wherein said connection electrodes (34b; 34c) are aligned in lines parallel to the direction in which the conductors (33b; 33c) extend from said first region to said second region. Display apparatus according to claim 1 or claim 2, wherein in said area said insulating layer (41b) covers substantially the whole of each of said conductors (33b). Display apparatus according to claim 1 or claim 2, wherein in said area said insulating layer (41c) is confined to covering portions of said conductors (33c) which lie adjacent the connection electrodes (34c) of others of said conductors. Display apparatus comprising: a first electrically insulating substrate (42a) having a first region in which a display panel is formed by an overlapping second electrically insulating substrate, and a second region where said substrates do not overlap each other; conductors (33a) formed on said first substrate (42a) and extending mutually parallel from said first region, where they form part of said display panel, to said second region, where they terminate in respective connection electrodes (34a); an integrated circuit component (43), for driving said display panel, mounted face-down on said first substrate (42a) in said second region, said integrated circuit component (43) having bonding electrodes (37) respectively electrically connected to said connection electrodes (34a) in the area beneath said integrated circuit component (43); and an electrically insulating layer (41a) formed over said conductors (33a), said insulating- layer extending over said first region and said second region, including said area of the second region which is covered by said integrated circuit component (43), except at said connection electrodes (34a) where said insulating layer (41a) exposes the whole of each connection electrode (34a) by terminating spaced from the periphery of the connection electrode; said connection electrodes (34a) being distributed within said area in a regular array in which they occupy the body and the periphery of said area. Display apparatus according to claim 5, wherein said connection electrodes (34a) are aligned in lines parallel to the direction in which the conductors (33a) extend from said first region to said second region. Display apparatus according to claim 5 or claim 6, wherein a sealing resin (38) fills the gap between said integrated circuit component (43) and said first substrate (42a). Display apparatus according to any preceding claim, wherein said electrically insulating layer (41) comprises SiO 2 or SiN x .

Inventors: DOTTA YOSHIHISA AKATSUKIRYO, INADA KIYOSHI, KAWASHIMA AKEBONORYO, MAKITA HIDESHI AKEBONORYO, TAGUSA YASUNOBU, YOHSIDA HIROKAZU, DOTTA, YOSHIHISA AKATSUKIRYO, INADA, KIYOSHI, KAWASHIMA, AKEBONORYO, MAKITA, HIDESHI AKEBONORYO, TAGUSA, YASUNOBU, YOHSIDA, HIROKAZU
Applicants: SHARP KK, SHARP KABUSHIKI KAISHA
Application year: 1989
Main classification: G02F1
IPC codes: G02F1