JP2006154317A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device which is capable of storing data having a fixed or more data volume without enlarging the size of an electronic component incorporating a memory. <P>SOLUTION: An LCD unit (display device ) 1 includes a glass substrate 22 constituting a display panel 20, a driving IC 25 attached to a surface of the glass substrate, an EPROM 25g which is incorporated in the driving IC 25 and allows data stored therein to be erased by irradiating with ultraviolet rays, and a light shielding member 50 which is disposed on the surface of the glass substrate 22, to which the driving IC 25 is attached, and shields light made incident on the EPROM 25g. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a display device, and more particularly to a display device including an electronic component attached to a display panel.

  Conventionally, a display device in which a flexible printed wiring board (FPC) is attached on a glass substrate of a display panel is known (for example, Patent Document 1). In Patent Document 1, a display image is written by writing data such as a correction value of a display panel in a nonvolatile memory (ROM) built in a power supply IC (electronic component) mounted on a glass substrate of a liquid crystal panel. A liquid crystal display device capable of correcting variations in the above is disclosed.

  FIG. 9 is a schematic diagram showing a liquid crystal display device (LCD (Liquid Crystal Display) unit) in which a driving IC is attached to a display panel according to an example of the related art. FIG. 10 is a circuit diagram showing an EEPROM memory cell array included in the driving IC of the conventional LCD unit shown in FIG. 9, and FIG. 11 is a cross-sectional view of the conventional LCD unit shown in FIG. A conventional LCD unit 100 will be described with reference to FIGS.

  A conventional LCD unit (display device) 100 includes a backlight unit 110 and a display panel 120 as shown in FIG. The display panel 120 includes a display area 130 on which characters and images are displayed. As shown in FIG. 11, a metal frame 140 is disposed below the backlight unit 110.

  The backlight unit 110 includes a reflective sheet 111 disposed above the frame 140, a resin frame 112 disposed above the reflective sheet 111, an LED 113 as a light source, and light from the LED 113 on the display panel 120. A light guide plate 114 for guiding to the whole, two lens sheets 115 that transmit and collect light from the light guide plate 114 upward, and a diffusion sheet 116 that transmits and diffuses light from the lens sheet 115 upward. Including. A flexible printed wiring board for backlight (backlight FPC) 117 is attached to the upper surface of the light guide plate 114 by a double-sided tape (not shown). Further, an LED 113 that irradiates light to the light guide plate 114 is attached to the backlight FPC 117. Further, an adhesive layer 118 is adhered to the upper side of the diffusion sheet 116 so as to surround a predetermined region outside the display region 130 (see FIG. 9).

  Further, as shown in FIG. 11, a display panel 120 is disposed on the upper side of the backlight unit 110. The display panel 120 includes a lower polarizing plate 121 disposed on the upper side of the adhesive layer 118, a lower glass substrate 122 and an upper glass substrate 123 disposed so as to sandwich the liquid crystal, and an upper glass substrate 123. And an upper polarizing plate 124 disposed on the upper side. Note that a thin film transistor (not shown) is formed on the lower glass substrate 122. Further, the lower glass substrate 122 is formed with a protruding portion 122 a that protrudes outward from the upper glass substrate 123.

  A driving IC (Integrated Circuit) 125 for driving the display panel 120 is attached to the surface of the protruding portion 122 a of the lower glass substrate 122 via an anisotropic conductive film (ACF) 126. . In the anisotropic conductive film 126, conductive conductive balls are uniformly arranged inside an insulating resin material. For this reason, by sandwiching the anisotropic conductive film 126 between the terminal 125a of the drive IC 125 and the terminal portion 127 provided on the surface of the lower glass substrate 122, the portion of the portion where the anisotropic conductive film 126 is sandwiched. Since the conductive balls are arranged so as to be coupled, the terminal 125a of the driving IC 125 and the terminal portion 127 are electrically connected. Further, a flexible printed wiring board for panel (panel FPC) 128 electrically connected to the terminal portion 127 is attached to the surface of the protruding portion 122a of the lower glass substrate 122. A light shielding tape 129 is attached to the back surface of the protruding portion 122 a of the lower glass substrate 122. The light shielding tape 129 has a function of suppressing light from the LED 113 from entering the driving IC 125.

  Further, as shown in FIG. 9, a driver 125b having a function of driving a signal supply line (drain line) and a DAC (Digital) for converting a digital video signal into an analog video signal are provided in the driving IC 125. (Analog Converter) 125c, a level shifter (L / S) 125d for converting the potential of the input video signal into a potential used for the display panel 120, and a power generation circuit 125e for generating power used by the display panel 120 And a signal generation circuit 125f and an EEPROM (Electrically Erasable Programmable Read Only Memory) 125g capable of erasing and writing electrically stored data. The EEPROM 125g includes correction values for correcting display image variations caused by characteristic variations of the display panel 120, setting values for setting drive ICs 125 commonly used for a plurality of models, and the like. Stored. In the EEPROM 125g, as shown in FIG. 10, one memory cell 125j is composed of two transistors, a storage transistor 125h having a floating gate and a selection transistor 125i.

JP 2002-287703 A

  In the EEPROM 125g built in the driving IC 125 attached to the display panel 120 of the conventional LCD unit 100 shown in FIGS. 9 to 11, one memory cell 125j is composed of two transistors, the memory transistor 125h and the selection transistor 125i. Since it is configured, high integration is difficult. For this reason, when the amount of data stored in the EEPROM 125g is large, the size of the EEPROM 125g increases, and thus there is a disadvantage in that the size of the drive IC 125 in which the EEPROM 125g is incorporated also increases. As a result, there is a problem that it becomes difficult to attach the driving IC 125 to the protruding portion 122a of the glass substrate 122 of the display panel 120.

  The present invention has been made to solve the above-described problems, and one object of the present invention is to achieve a certain level or more without increasing the size of an electronic component (drive IC) in which a memory is built. To provide a display device capable of storing data having a data amount.

Means for Solving the Problems and Effects of the Invention

  In order to achieve the above object, a display device according to one aspect of the present invention includes a display panel, an electronic component attached to the surface of the display panel, and data stored in the electronic component by being irradiated with light. Erasable memory, and a first light shielding member that is disposed on the surface of the display panel on which electronic components are attached and shields light incident on the memory.

  In the display device according to this aspect, unlike the memory capable of erasing data in units of bits by providing a memory capable of erasing data stored by irradiating light as described above, the memory Since there is no need to provide a selection transistor for selecting a specific bit, the size of the memory cell can be reduced accordingly. Thereby, even when data having a certain amount of data is stored in the memory, it is possible to suppress the memory from becoming large. For this reason, even if data of a certain amount or more is stored in the memory, it is possible to suppress an increase in the size of the electronic component incorporating the memory. As a result, even when the part where the electronic component is installed is limited, the electronic component can be arranged. Further, by providing a first light shielding member that shields light incident on the memory built in the electronic component on the surface of the display panel on which the electronic component is mounted, the display panel is built in the electronic component at a position close to the electronic component. Since the light incident on the memory can be shielded, the data stored in the memory can be securely held.

  In the display device according to the above aspect, preferably, the memory is provided with an opening for irradiating light when erasing stored data, and the first light shielding member covers at least the opening. It is provided as follows. If comprised in this way, since the light which injects into the opening part of a memory can be light-shielded by the 1st light shielding member, the data stored in the memory can be hold | maintained easily.

  In the display device in which an opening is provided in the memory, the first light shielding member is preferably provided so as to cover not only the opening but also the entire memory. With this configuration, light incident from an oblique direction toward the opening of the memory can also be shielded, so that light incident on the memory can be shielded more reliably.

  In the display device in which the opening is provided in the memory, preferably, the opening of the memory is provided on the lower surface side of the electronic component, and the first light shielding member is formed between the lower surface of the electronic component and the surface of the display panel. Arranged between. According to this configuration, even when light incident on the display panel travels in the direction of the electronic component while being refracted in the display panel, the first light shielding disposed between the opening of the memory and the display panel. The light can be easily blocked by the member.

  In the display device according to the above aspect, the first light shielding member is preferably made of a metal layer. If comprised in this way, the light which injects into a memory can be reflected by the metal 1st light shielding member.

  In the display device according to the above aspect, the wiring pattern is preferably disposed on the surface of the display panel on which the electronic component is attached, and the first light-shielding member includes at least a part of a layer constituting the wiring pattern. It is formed by the same layer. If comprised in this way, when forming a wiring pattern, since a 1st light shielding member can be easily formed by masking the part which forms a 1st light shielding member, a 1st light shielding member is attached. The manufacturing process can be simplified as compared with the case where it is formed separately.

  In this case, preferably, a terminal portion constituted by a wiring pattern is provided at a position where the electronic component of the display panel is connected, and the first light shielding member is spaced from the terminal portion of the wiring pattern by a predetermined distance. It is formed in the position. If comprised in this way, since the 1st light shielding member and the terminal part of a wiring pattern are not electrically connected, in the 1st light shielding member formed by the same layer as at least one part of the layer which comprises a wiring pattern It is possible to prevent a current from flowing. Accordingly, it is possible to prevent power from being consumed due to current flowing through the first light shielding member.

  In the display device according to the above aspect, the memory preferably includes an EPROM capable of erasing stored data by irradiating with ultraviolet rays. With this configuration, since one memory cell is configured by one transistor in the EEPROM, the memory cell size is reduced as compared with a memory such as an EEPROM in which one memory cell is configured by two transistors. be able to. This makes it possible to store data having a certain amount of data in the EPROM without increasing the memory. Even if the EPROM is arranged on the surface of the display panel, the ultraviolet light can be shielded by the first light shielding member, so that the data stored in the EPROM can be securely held.

  In the display device according to the one aspect described above, preferably, the display device further includes a backlight light source disposed on the back side of the display panel, and the back surface of the display panel is configured to suppress light leakage from the backlight light source. Two light shielding members are arranged, and the memory is shielded not only by the first light shielding member but also by the second light shielding member. With this configuration, even when light from the backlight light source is about to enter the memory, both the first light shielding member and the second light shielding member can block the light incident on the memory. Therefore, it is possible to prevent light from entering the memory more reliably.

  In the display device according to the above aspect, the upper surface of the electronic component is preferably mirror-finished. With this configuration, the light irradiated on the upper surface of the electronic component can be reflected by the upper surface of the mirror-finished electronic component, so that the light enters the memory inside the electronic component from the upper surface of the electronic component. Can be prevented.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing a state in which a driving IC is attached to a display panel of an LCD unit (display device) according to an embodiment of the present invention. 2 to 8 are views for explaining a detailed configuration of the LCD unit according to the embodiment of the present invention. With reference to FIGS. 1-8, the structure of the LCD unit 1 by one Embodiment of this invention is demonstrated. In the present embodiment, an LCD unit 1 as an example of the display device of the present invention will be described.

  As shown in FIG. 1, the LCD unit 1 according to an embodiment of the present invention includes a backlight unit 10 and a display panel 20. The display panel 20 includes a display area 30 on which characters and images are displayed. Further, as shown in FIGS. 3 and 4, a metal frame 40 is disposed below the backlight unit 10.

  As shown in FIG. 4, the backlight unit 10 includes a reflective sheet 11 disposed on the upper side of the frame 40, a resin frame 12 disposed on the upper side of the reflective sheet 11, an LED 13 as a light source, and an LED 13. Light guide plate 14 for guiding the light from the entire display panel 20, two lens sheets 15 that transmit and condense the light from the light guide plate 14 to the upper side, and light from the lens sheet 15 to the upper side And a diffusion sheet 16 that diffuses. The LED 13 is an example of the “backlight light source” in the present invention. A flexible printed wiring board for backlight (backlight FPC) 17 is attached to the upper surface of the light guide plate 14 by a double-sided tape (not shown). Further, an LED 13 that irradiates light to the light guide plate 14 is attached to the backlight FPC 17. An adhesive layer 18 is adhered to the upper surface of the diffusion sheet 16 so as to surround a predetermined region outside the display region 30 (see FIG. 1).

  A display panel 20 is disposed on the upper side of the backlight unit 10. The display panel 20 includes a lower polarizing plate 21 disposed on the upper side of the adhesive layer 18, a lower glass substrate 22 and an upper glass substrate 23 which are disposed so as to sandwich liquid crystal, and an upper glass substrate 23. And an upper polarizing plate 24 disposed on the upper side. A thin film transistor (not shown) is formed on the lower glass substrate 22. Further, the lower glass substrate 22 is formed with a protruding portion 22 a that protrudes outward from the upper glass substrate 23. Further, as shown in FIGS. 5 and 7, a driving IC 25 for driving the display panel 20 is provided on the surface of the protruding portion 22 a of the lower glass substrate 22 through an anisotropic conductive film (ACF) 26. It is attached. In the anisotropic conductive film 26, conductive conductive balls are uniformly arranged inside an insulating resin material. For this reason, the anisotropic conductive film 26 is sandwiched between the terminal 25a of the driving IC 25 and the terminal portion 27a of the wiring pattern 27 described later provided on the surface of the lower glass substrate 22 to sandwich the anisotropic conductive film 26. Since the conductive balls in the sandwiched portion are arranged so as to be coupled, the terminal 25a of the driving IC 25 and the terminal portion 27a are electrically connected.

  As shown in FIG. 1, a driver 25b having a function of driving a signal supply line (drain line) and a DAC 25c for converting a digital video signal into an analog video signal are input into the driving IC 25. A level shifter (L / S) 25d for converting the potential of the video signal to a potential used for the display panel 20, a power generation circuit 25e for generating a power source used in the display panel 20, a signal generation circuit 25f, and ultraviolet rays. An EPROM (Erasable Programmable Read Only Memory) 25g capable of erasing stored data by irradiation is incorporated. The EPROM 25g is an example of the “memory” in the present invention.

  Further, as shown in FIG. 5, since the upper surface of the drive IC 25 is mirror-finished, the light (ultraviolet rays) irradiated on the upper surface of the drive IC 25 traveling in the direction of arrow A in FIG. Since the light can be reflected from the upper surface of the IC 25, it is possible to prevent light from entering the EPROM 25g inside the drive IC 25 from the upper surface of the drive IC 25.

  As shown in FIGS. 5, 7, and 8, an opening 25h for irradiating ultraviolet rays when erasing stored data is provided on the lower surface side of the EPROM 25g. Further, in the EPROM 25g, a correction value for correcting the variation in the display image caused by the variation in the characteristics of the display panel 20, a setting value for setting the drive IC 25 commonly used for a plurality of models for each model, and the like. Is stored. In the EPROM 25g, as shown in FIG. 2, one memory cell 25i is composed of one memory transistor 25h having a floating gate. Thus, the EPROM 25g has about twice as many memory cells 25i per unit area as the EEPROM 125g in which one memory cell 125j is configured from the two conventional transistors 125h and 125i shown in FIG.

  As shown in FIGS. 6 and 7, a wiring pattern 27 made of a plurality of metal layers such as aluminum and chromium is formed on the surface of the glass substrate 22. This wiring pattern 27 is electrically connected to the drive IC 25.

  Here, in the present embodiment, the light incident on the EPROM 25g of the drive IC 25 is shielded on the surface of the projection 22a of the glass substrate 22 on which the drive IC 25 is attached, as shown in FIGS. A light shielding member 50 is provided. The light shielding member 50 is an example of the “first light shielding member” in the present invention. The light shielding member 50 is formed of the same layer as the aluminum layer constituting the wiring pattern 27. The light shielding member 50 is disposed between the lower surface of the EPROM 25g and the protruding portion 22a of the glass substrate 22, and is disposed so as to cover not only the opening 25h of the EPROM 25g but also the entire EPROM 25g.

  In the present embodiment, the light shielding member 50 is formed at a position spaced apart from the terminal portion 27 a of the wiring pattern 27 by a predetermined distance. As a result, since the light shielding member 50 and the terminal portion 27a of the wiring pattern 27 are not electrically connected, current flows through the light shielding member 50 formed of the same layer as the aluminum layer constituting the wiring pattern 27. Can be prevented. As a result, it is possible to prevent power from being consumed due to current flowing through the light shielding member 50.

  A panel flexible printed wiring board (panel FPC) 28 electrically connected to the driving IC 25 is attached to the surface of the protruding portion 22 a of the lower glass substrate 22.

  In the present embodiment, a light shielding tape 29 is attached to the back surface of the protruding portion 22 a of the lower glass substrate 22. The light shielding tape 29 is an example of the “second light shielding member” in the present invention. The light shielding tape 29 has a function of suppressing light from the LED 13 from entering the drive IC 25. Thus, even when light from the LED 13 is about to enter the opening 25h of the EPROM 25g of the driving IC 25, the light incident on the opening 25h of the EPROM 25g can be easily blocked by the light shielding member 50 and the light shielding tape 29. Therefore, it becomes possible to more reliably prevent light from entering the opening 25h of the EPROM 25g.

  In the present embodiment, as described above, the conventional EEPROM 125g (see FIG. 10) that can be erased in units of bits by providing the EPROM 25g capable of erasing the stored data by irradiating ultraviolet rays. Unlike the conventional EEPROM 125g memory cell 125j (see FIG. 10), the size of the memory cell 25i can be reduced because the selection transistor 125i (see FIG. 10) need not be provided in the EPROM 25g. Can be small. Thereby, even when data having a certain amount of data is stored in the EPROM 25g, it is possible to suppress the EPROM 25g from becoming large. For this reason, even if a certain amount or more of data is stored in the EPROM 25g, it is possible to suppress an increase in the driving IC 25 incorporating the EPROM 25g. As a result, the drive IC 25 can be disposed even when the installation portion of the protruding portion 22a of the glass substrate 22 on which the drive IC 25g is installed is limited.

  Further, in the present embodiment, the light shielding member 50 that shields the light incident on the EPROM 25g built in the drive IC 25 is provided on the surface of the glass substrate 22 where the drive IC 25 is attached, thereby being close to the drive IC 25. Since the light incident on the EPROM 25g built in the drive IC 25 can be shielded at the position, the data stored in the EPROM 25g can be securely held.

  Further, in the present embodiment, by providing the light shielding member 50 so as to cover not only the opening 25h of the EPROM 25g but also the entire EPROM 25g, light incident from an oblique direction toward the opening 25h of the EPROM 25g can also be shielded. Therefore, the light incident on the EPROM 25g can be more reliably shielded.

  In the present embodiment, the opening 25h of the EPROM 25g is provided on the lower surface side of the drive IC 25, and the light shielding member 50 is disposed between the lower surface of the drive IC 25 and the surface of the glass substrate 22, thereby displaying the display region 30. Even when light incident on the glass substrate 22 of the display panel 20 travels in the direction of arrow B in FIGS. 5 and 7 while being refracted in the glass substrate 22, the opening 25h of the EPROM 25g and the glass The light can be easily blocked by the light blocking member 50 disposed between the substrate 22 and the substrate 22.

  Further, in the present embodiment, the light shielding member 50 is formed of the same layer as the aluminum layer constituting the wiring pattern 27, so that the portion where the light shielding member 50 is formed is masked when the wiring pattern 27 is formed. Thus, since the light shielding member 50 can be easily formed, the manufacturing process can be simplified as compared with the case where the light shielding member 50 is separately formed.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiment but by the scope of claims for patent, and all modifications within the meaning and scope equivalent to the scope of claims for patent are included.

  For example, in the above-described embodiment, an example in which the present invention is applied to an LCD unit as an example of a display device has been described. However, the present invention is not limited thereto, and an organic EL or the like can be used as long as the display device includes a display panel. The present invention may be applied to other display devices.

  Moreover, although the example which comprises the light shielding member by the same layer as the layer which comprises a wiring pattern was shown in the said embodiment, this invention is not limited to this, The light shielding member which consists of layers other than the layer which comprises a wiring pattern was shown. It may be provided separately.

  Moreover, in the said embodiment, although the example which arrange | positions the terminal part of a wiring pattern, and the light shielding member at predetermined intervals was shown, this invention is not restricted to this, The terminal part of a wiring pattern, and a light shielding member You may form so that may be connected.

  In the above embodiment, the example in which the light shielding member is formed so as to cover not only the opening portion of the EPROM but also the entire EPROM has been shown. However, the present invention is not limited to this, and is formed to cover only the opening portion of the EPROM. May be. In this case, it is preferable to form the light shielding member larger than the opening in order to prevent light incident from an oblique direction toward the opening of the EPROM.

FIG. 6 is a block diagram illustrating a state in which a driving IC is attached to a display panel of an LCD unit according to an embodiment of the present invention. FIG. 2 is a circuit diagram illustrating a memory cell array of an EPROM of the LCD unit according to the embodiment of the present invention illustrated in FIG. 1. It is the perspective view which showed the whole structure of the LCD unit by one Embodiment of this invention shown in FIG. It is sectional drawing along the 200-200 line | wire of FIG. FIG. 2 is a partially enlarged view of the LCD unit according to the embodiment of the present invention shown in FIG. 1. FIG. 2 is a plan view of a display panel of the LCD unit according to the embodiment of the present invention shown in FIG. 1. It is sectional drawing along the 300-300 line of FIG. FIG. 2 is an enlarged view of a display panel of the LCD unit according to the embodiment of the present invention shown in FIG. 1. It is the block diagram which showed the state by which drive IC was attached to the display panel of the LCD unit by a prior art example. FIG. 10 is a circuit diagram showing an EEPROM memory cell array of the conventional LCD unit shown in FIG. 9. FIG. 10 is a cross-sectional view of the conventional LCD unit shown in FIG. 9.

Explanation of symbols

1 LCD unit (display device)
13 LED (light source for backlight)
20 Display panel 25 Drive IC (electronic component)
25a terminal 25g EPROM (memory)
25h opening 27 wiring pattern 27a terminal 29 light shielding tape (second light shielding member)
50 light shielding member (first light shielding member)

Claims (10)

A display panel;
Electronic components attached to the surface of the display panel;
A memory built in the electronic component and capable of erasing stored data by irradiating light;
A display device, comprising: a first light shielding member disposed on a surface of the display panel on which the electronic component is attached and shielding light incident on the memory. The memory is provided with an opening for irradiating light when erasing stored data,
The display device according to claim 1, wherein the first light shielding member is provided so as to cover at least the opening.   The display device according to claim 2, wherein the first light shielding member is provided so as to cover not only the opening but also the entire memory. The opening of the memory is provided on the lower surface side of the electronic component,
The display device according to claim 2, wherein the first light shielding member is disposed between a lower surface of the electronic component and a surface of the display panel.   The display device according to claim 1, wherein the first light shielding member is made of a metal layer. On the surface on which the electronic component of the display panel is attached, a wiring pattern is disposed,
The display device according to claim 1, wherein the first light shielding member is formed of the same layer as at least a part of the layers constituting the wiring pattern. A terminal portion constituted by the wiring pattern is provided at a position where the electronic component of the display panel is connected,
The display device according to claim 6, wherein the first light shielding member is formed at a position spaced apart from a terminal portion of the wiring pattern by a predetermined distance.   The display device according to claim 1, wherein the memory includes an EPROM capable of erasing data stored by irradiating with ultraviolet rays. A backlight light source disposed on the back side of the display panel;
A second light shielding member for suppressing light leakage from the backlight light source is disposed on the back surface of the display panel,
The display device according to claim 1, wherein the memory is shielded not only by the first light shielding member but also by the second light shielding member.   The display device according to claim 1, wherein an upper surface of the electronic component is mirror-finished.

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