Liquid crystal display device

Abstract

The liquid crystal display device includes: first and second substrates; a liquid crystal layer sandwiched between the first and second substrates; a pixel array (2) disposed in the display region of the first substrate and including a plurality of pixels; a plurality of scanning lines arranged in the pixel array (2); a scan line drive circuit (4) provided on the first substrate, disposed in a peripheral region around the display region, connected to the plurality of scan lines, and including a plurality of transistors; a black matrix (14) provided on the second substrate and configured so as to block light from boundaries and peripheral regions of the plurality of pixels; and a color resin layer (29) disposed on the black matrix (14) in the peripheral region.

Description

Technical Field

[0001] The present invention relates to a liquid crystal display device. Background Art

[0002] An active matrix liquid crystal display device comprises: a plurality of scanning lines extending in the row direction and inputting scanning signals; a plurality of signal lines extending in the column direction and inputting image signals; and a plurality of pixels arranged in a plurality of intersection regions where the plurality of scanning lines and the plurality of signal lines intersect. The plurality of pixels constitute a pixel array. The pixel comprises a thin film transistor (TFT: Thin Film Transistor) as an active element provided on a TFT substrate.

[0003] It is known that there is a liquid crystal display device in which a scanning line driving circuit for driving a plurality of scanning lines is arranged on one side of a pixel array. This structure is called a GIP (gate in panel) structure, for example. The scanning line driving circuit has a shift register circuit for scanning a plurality of scanning lines. The shift register circuit is formed using a plurality of TFTs. The plurality of TFTs constituting the shift register circuit are formed on a TFT substrate.

[0004] In the GIP structure, a light shielding layer (called a black matrix) is arranged on the upper part of the scan line driving circuit. The black matrix is ​​arranged on an opposing substrate opposite to the TFT substrate. The black matrix is ​​configured to include chromium with light shielding properties, for example. In the black matrix thus configured, light from the backlight is incident on the surface on the liquid crystal layer side, and light incident from the backlight to the black matrix is ​​reflected to the liquid crystal layer side. The reflected light reflected by the black matrix is ​​irradiated to a plurality of TFTs included in the scan line driving circuit. When light is irradiated to the TFT, a light leakage current is generated, and there is a problem that the scan line driving circuit malfunctions.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Publication No. 2000-275676 Summary of the invention

[0008] Problems to be solved by the invention

[0009] The present invention provides a liquid crystal display device capable of performing stable operation.

[0010] Means for solving problems

[0011] According to a first scheme of the present invention, there is provided a liquid crystal display device, comprising: a first and a second substrate; a liquid crystal layer, clamped by the first and second substrates; a pixel array, arranged in a display area of ​​the first substrate, comprising a plurality of pixels; a plurality of scan lines, arranged in the pixel array; a scan line drive circuit, arranged on the first substrate, arranged in a peripheral area around the display area, connected to the plurality of scan lines, comprising a plurality of transistors; a black matrix, arranged on the second substrate, configured to shield the boundaries of the plurality of pixels and the peripheral area; and a color resin layer, arranged on the black matrix in the peripheral area.

[0012] A second aspect of the present invention provides the liquid crystal display device according to the first aspect, wherein the color resin layer is red.

[0013] A third aspect of the present invention provides the liquid crystal display device according to the first aspect, wherein the color resin layer is composed of a laminated film of a red color resin layer and a color resin layer of a color other than red.

[0014] A fourth aspect of the present invention provides the liquid crystal display device according to the third aspect, wherein the color resin layer of a color other than red is green.

[0015] A fifth aspect of the present invention provides the liquid crystal display device according to the first aspect, wherein each of the plurality of transistors includes a semiconductor layer composed of amorphous silicon.

[0016] A sixth aspect of the present invention provides the liquid crystal display device according to the first aspect, wherein each of the plurality of transistors is formed of a TFT (Thin Film Transistor).

[0017] A seventh aspect of the present invention provides the liquid crystal display device according to the first aspect, wherein the black matrix is ​​formed by laminating a chromium oxide layer and a chromium layer in this order from the first substrate side.

[0018] An eighth aspect of the present invention provides the liquid crystal display device according to the first aspect, further comprising a color filter provided in the display region of the second substrate.

[0019] A ninth aspect of the present invention provides the liquid crystal display device according to the eighth aspect, wherein the color resin layer is arranged in contact with the color filter.

[0020] A tenth aspect of the present invention provides the liquid crystal display device according to the eighth aspect, further comprising a common electrode provided on the color resin layer and the color filter.

[0021] An eleventh aspect of the present invention provides the liquid crystal display device according to the first aspect, further comprising a backlight for irradiating white light toward the first substrate.

[0022] Effects of the Invention

[0023] According to the present invention, it is possible to provide a liquid crystal display device that performs stable operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a block diagram of a liquid crystal display device according to a first embodiment of the present invention.

[0025] Figure 2 yes Figure 1 Circuit diagram of the pixel array shown.

[0026] Figure 3 It is a plan view illustrating the layout of a liquid crystal display device.

[0027] Figure 4 It is a top view explaining the structure of a black matrix.

[0028] Figure 5 It is along Figure 4 A cross-sectional view of a liquid crystal display device taken along line AA′.

[0029] Figure 6 yes Figure 5 A cross-sectional view of a TFT is shown.

[0030] Figure 7 This is a plan view for explaining the structure of the color resin layer.

[0031] Figure 8 This is a graph illustrating an example of the frequency spectrum of backlight.

[0032] Fig. 9 This is a graph explaining the spectral transmittance of a color filter.

[0033] Fig.10 This is a graph for explaining the light intensity of the reflected light from the black matrix.

[0034] Fig.11 This is a graph illustrating the spectral sensitivity of amorphous silicon.

[0035] Fig.12 is a cross-sectional view of a liquid crystal display device of a comparative example.

[0036] Fig.13 It is a cross-sectional view of a liquid crystal display device according to a second embodiment of the present invention.

[0037] Fig.14 It is a cross-sectional view of a liquid crystal display device according to a modified example.

[0038] Fig.15 It is a plan view illustrating the layout of a liquid crystal display device according to a third embodiment of the present invention.

[0039] Fig.16 It is a plan view for explaining the structure of the black matrix according to the third embodiment.

[0040] Fig.17 This is a plan view for explaining the structure of the color resin layer according to the third embodiment. DETAILED DESCRIPTION

[0041] Hereinafter, the embodiments will be described with reference to the accompanying drawings. However, the accompanying drawings are schematic or conceptual drawings, and the dimensions and ratios of the drawings are not necessarily the same as the actual situation. In addition, even when the drawings represent the same parts, there are cases where the mutual dimensional relationships and ratios are represented differently. In particular, the several embodiments shown below illustrate the apparatus and method for concretizing the technical idea of ​​the present invention, and the technical idea of ​​the present invention is not determined by the shape, structure, configuration, etc. of the constituent parts. In addition, in the following description, the same symbols are given to the elements with the same function and structure, and repeated descriptions are only performed when necessary.

[0042] [1] First Embodiment

[0043] [1-1] Overall Configuration of Liquid Crystal Display Device 1

[0044] Figure 1 This is a block diagram of a liquid crystal display device 1 according to a first embodiment of the present invention. The liquid crystal display device 1 includes a pixel array 2, a backlight (illumination device) 3, a scanning line driving circuit 4, a signal line driving circuit 5, a common electrode driving circuit 6, a voltage generating circuit 7, and a control circuit 8.

[0045] The pixel array 2 includes a plurality of pixels PX arranged in a matrix. The pixel array 2 is provided with a plurality of scanning lines GL1 to GLm extending in the row direction and a plurality of signal lines SL1 to SLn extending in the column direction. "m" and "n" are integers greater than 2. The pixel PX is arranged in the intersection area of ​​the scanning line GL and the signal line SL.

[0046] The backlight 3 is a surface light source that irradiates light to the back side of the pixel array 2. For example, a direct-light type or side-light type (edge-light type) LED backlight is used as the backlight 3. The backlight 3 includes a plurality of white LEDs that emit white light.

[0047] The scanning line driving circuit 4 is connected to the plurality of scanning lines GL. The scanning line driving circuit 4 transmits a scanning signal for turning on / off a switching element included in the pixel PX to the pixel array 2 based on a control signal transmitted from the control circuit 8. The scanning line driving circuit 4 has a shift register circuit for sequentially scanning the plurality of scanning lines GL. The shift register circuit operates in a manner that sequentially shifts the scanning signal relative to the plurality of scanning lines during each frame period.

[0048] The signal line driving circuit 5 is electrically connected to the plurality of signal lines SL and receives a control signal and display data from the control circuit 8. The signal line driving circuit 5 transmits a plurality of grayscale signals (a plurality of driving voltages) corresponding to the display data to the pixel array 2 based on the control signal.

[0049] The common electrode driving circuit 6 generates a common voltage Vcom and supplies it to the common electrodes in the pixel array 2. The voltage generating circuit 7 generates various voltages required for the operation of the liquid crystal display device 1 and supplies them to various circuits.

[0050] The control circuit 8 generally controls the operation of the liquid crystal display device 1. The control circuit 8 receives image data DT and a control signal CNT from the outside. The control circuit 8 generates various control signals based on the image data DT and transmits these control signals to corresponding circuits.

[0051] Figure 2 yes Figure 1 The circuit diagram of the pixel array 2 is shown. Figure 2 The X direction is the row direction in which the scan lines extend, and the Y direction is the column direction in which the signal lines extend.

[0052] The pixel array 2 is provided with a plurality of scanning lines GL1 to GLm and a plurality of signal lines SL1 to SLn.

[0053] The pixel PX includes a switching element (active element) 9, a liquid crystal capacitor (liquid crystal element) Clc, and a cumulative capacitor Cs. As the switching element 9, for example, a TFT (Thin Film Transistor) is used, and an n-channel TFT is used. In addition, the source and drain of the transistor change according to the direction of the current flowing in the transistor, but an example of the connection state of the transistor is described in the following description. However, the source and drain are of course not fixed as the name suggests.

[0054] The source of TFT9 is connected to the signal line SL, the gate thereof is connected to the scanning line GL, and the drain thereof is connected to one electrode of the liquid crystal capacitor Clc. The liquid crystal capacitor Clc as a liquid crystal element is composed of a pixel electrode, a common electrode, and a liquid crystal layer sandwiched therebetween. The other electrode of the liquid crystal capacitor Clc is applied with a common voltage Vcom by the common electrode driving circuit 6.

[0055] One electrode of the accumulation capacitor Cs is connected to one electrode of the liquid crystal capacitor Clc. The other electrode of the accumulation capacitor Cs is applied with a common voltage Vcom by the common electrode driving circuit 6. The accumulation capacitor Cs has the following functions: suppressing the potential change generated in the pixel electrode and maintaining the driving voltage applied to the pixel electrode until the driving voltage corresponding to the next signal is applied. The accumulation capacitor Cs is composed of a pixel electrode, an accumulation capacitor line, and an insulating layer sandwiched between them. The other electrode (accumulation capacitor line) of the accumulation capacitor Cs can also be applied with an accumulation capacitor voltage different from the common voltage Vcom.

[0056] [1-2] Specific Configuration of Liquid Crystal Display Device 1

[0057] Next, the specific configuration of the liquid crystal display device 1 will be described. Figure 3 It is a plan view for explaining the layout of the liquid crystal display device 1 .

[0058] The liquid crystal display device 1 includes a TFT substrate 10, a pixel array 2, two scanning line drive circuits 4-1 and 4-2, and an integrated circuit (IC) 11. The scanning line drive circuits 4-1 and 4-2 correspond to Figure 1 Scan line driving circuit 4.

[0059] The TFT substrate 10 is composed of a transparent and insulating substrate (such as a glass substrate or a plastic substrate). The pixel array 2, the scanning line driving circuits 4-1 and 4-2, and the integrated circuit 11 are provided on the TFT substrate 10. A CF (color filter) substrate (not shown) is arranged above the TFT substrate 10, and a liquid crystal layer (not shown) is arranged between the TFT substrate 10 and the CF substrate.

[0060] The liquid crystal display device 1 includes a display area DA and a peripheral area PA around the display area DA. The display area DA is an area where an image is displayed. The peripheral area PA is an area where peripheral circuits for controlling the operation of the pixel array 2 are arranged.

[0061] A pixel array 2 is provided in the display area DA of the TFT substrate 10. The pixel array 2 includes a plurality of scanning lines GL extending in the X direction and a plurality of signal lines SL extending in the Y direction.

[0062] Scan line drive circuits 4-1 and 4-2 are provided in the peripheral area PA of the TFT substrate 10. The scan line drive circuits 4-1 and 4-2 are respectively arranged on both sides of the pixel array 2 in the X direction. The scan line drive circuit 4-1 is connected to the odd-numbered scan lines GL and drives the odd-numbered scan lines GL. The scan line drive circuit 4-2 is connected to the even-numbered scan lines GL and drives the even-numbered scan lines GL. The connection relationship between the scan line drive circuits 4-1 and 4-2 and the plurality of scan lines GL can be arbitrarily set.

[0063] An integrated circuit 11 is arranged at the end in the Y direction in the peripheral area PA of the TFT substrate 10. The integrated circuit 11 includes a signal line driving circuit 5, a common electrode driving circuit 6, a voltage generating circuit 7, and a control circuit 8. The integrated circuit 11 is composed of an IC chip. The scanning line driving circuits 4-1 and 4-2 are connected to the integrated circuit 11 using a plurality of wirings 12. A plurality of signal lines SL are connected to the integrated circuit 11.

[0064] Next, the structure of the black matrix (also referred to as a light shielding layer) 14 will be described. Figure 4 1 is a top view for explaining the structure of the black matrix 14. Figure 4 In the figure, the black matrix 14 is indicated by additional oblique hatching.

[0065] The liquid crystal display device 1 includes a CF substrate 13 disposed above a TFT substrate 10, and a black matrix 14 disposed on the CF substrate 13. The CF substrate 13 is composed of a transparent and insulating substrate (e.g., a glass substrate or a plastic substrate). For example, the length of the CF substrate 13 in the X direction is the same as the length of the TFT substrate 10 in the X direction. The length of the CF substrate 13 in the Y direction is shorter than the length of the TFT substrate 10 in the Y direction. The integrated circuit 11 is arranged in a portion of the TFT substrate 10 that is longer than the CF substrate 13.

[0066] The black matrix 14 has a function of improving contrast by shielding light at the boundaries between pixels of different colors. The black matrix 14 has an opening provided for each pixel PX and is provided at the boundaries between the plurality of pixels PX. Figure 4 The arrangement of the pixels PX is in the form of a matrix of quadrilaterals. Figure 4 In the example, different shaded lines are used to represent red, green, and blue pixels ( Figure 4 In this embodiment, as the arrangement of the color filters, a stripe arrangement is shown as an example, but it is not limited to this, and any arrangement including a mosaic arrangement and a delta arrangement can be applied. Compared with the size shown in the figure, the size of the pixel PX is actually small enough.

[0067] In addition, the black matrix 14 is configured to cover the peripheral area PA. The peripheral area PA covered by the black matrix 14 corresponds to the frame of the liquid crystal display device 1. The frame is visually recognized as a black area for the observer. The elements (including transistors) configured in the peripheral area PA are shielded from light by the black matrix 14.

[0068] Next, the stacked structure of the liquid crystal display device 1 will be described. Figure 5 It is along Figure 4 A cross-sectional view of the liquid crystal display device 1 taken along line AA′. Figure 5 In the figure, the area on the left side of the liquid crystal display device 1 along the X direction is shown as the center, but the area on the right side is relative to Figure 5 The composition becomes a line-symmetrical composition.

[0069] The liquid crystal display device 1 includes a TFT substrate 10 on which switching elements (TFTs) and pixel electrodes are formed, and a CF substrate 13 which is arranged to face the TFT substrate 10 and on which color filters are formed.

[0070] The liquid crystal layer 20 is sandwiched and filled between the TFT substrate 10 and the CF substrate 13. Specifically, the liquid crystal layer 20 is sealed in a region surrounded by the TFT substrate 10, the CF substrate 13, and the sealing material 21. The sealing material 21 is composed of, for example, an ultraviolet curing resin, a thermosetting resin, or an ultraviolet and thermosetting resin, and is applied to the TFT substrate 10 or the CF substrate 13 in the manufacturing process and then cured by ultraviolet irradiation or heating.

[0071] The liquid crystal material constituting the liquid crystal layer 20 is manipulated to change the optical properties by orienting the liquid crystal molecules according to the applied electric field. In this embodiment, the VA (Vertical Alignment) mode is described as an example. The liquid crystal mode is not limited to the VA mode, and the TN (Twisted Nematic) mode or the homogeneous mode may also be used. In the VA mode, a negative (N-type) nematic liquid crystal having a negative dielectric constant anisotropy is used as the liquid crystal layer 20. The liquid crystal layer 20 is vertically oriented in the initial state. The liquid crystal molecules are oriented approximately perpendicularly to the main surface of the substrate when there is no voltage (no electric field). When voltage is applied (electric field is applied), the director of the liquid crystal molecules is tilted toward the horizontal direction (the direction parallel to the main surface of the substrate).

[0072] Next, the structure of the TFT substrate 10 side is described. A polarizing plate 22 is provided on the side of the TFT substrate 10 opposite to the liquid crystal layer 20. The polarizing plate 22 is composed of a linear polarizing plate and has a transmission axis and an absorption axis that are orthogonal to each other. The transmission axis of the polarizing plate 22 is appropriately set according to the display mode (normally black mode or normally white mode) of the liquid crystal display device 1.

[0073] The backlight 3 is arranged on the side of the polarizing plate 22 opposite to the TFT substrate 10. The backlight 3 is bonded to the polarizing plate 22 via a light shielding tape 23. The light shielding tape 23 is provided along the periphery of the backlight 3 and the polarizing plate 22 and has a frame shape. The light shielding tape 23 has a function of shielding light and has an adhesive material on its upper surface and bottom surface. The adhesive material on the bottom surface of the light shielding tape 23 is bonded to the backlight 3, and the adhesive material on the upper surface of the light shielding tape 23 is bonded to the polarizing plate 22. The light shielding tape 23 is made of, for example, a black double-sided tape.

[0074] A switching element 9 is provided for each pixel PX on the liquid crystal layer 20 side of the TFT substrate 10. As the switching element 9, for example, a TFT is used, and an n-channel TFT is used. The TFT 9 is also called a transistor.

[0075] Figure 6 yes Figure 5 TFT9 is a cross-sectional view of TFT9 shown in FIG. TFT9 is an inverse staggered type (also called a bottom gate type) in which the gate electrode is arranged below the source electrode and the drain electrode (on the substrate side). In this embodiment, a channel-etched TFT is used as an example for explanation. The channel-etched TFT is a TFT manufactured by a manufacturing process in which the semiconductor layer is also etched when the source electrode and the drain electrode are processed. TFT9 can also be an etch-stop type. The etch-stop type TFT is a TFT manufactured by a manufacturing process in which the source electrode and the drain electrode are processed using an etch-stop layer formed on the semiconductor layer.

[0076] A gate electrode GL extending in the X direction is provided on the TFT substrate 10. The gate electrode GL functions as a scanning line. As the gate electrode GL, for example, any one of aluminum (Al), molybdenum (Mo), chromium (Cr), and tungsten (W), or an alloy containing one or more of these materials is used.

[0077] A gate insulating film (also referred to as an insulating layer) 25-1 is provided on the TFT substrate 10 and the gate electrode GL. A transparent insulating material, such as silicon nitride (SiN), is used as the gate insulating film 25-1.

[0078] A semiconductor layer 31 is provided on the gate insulating film 25-1. As the semiconductor layer 31, for example, amorphous silicon is used.

[0079] Ohmic contact layers 32 and 33 are provided on the semiconductor layer 31. The ohmic contact layers 32 and 33 have the function of making good electrical connection between the semiconductor layer 31 and the electrode. The ohmic contact layers 32 and 33 are made of n-type impurities with high concentrations. + Type semiconductor layer composition.

[0080] A source electrode 34 is provided on the ohmic contact layer 32. A drain electrode 35 is provided on the ohmic contact layer 33. As the source electrode 34 and the drain electrode 35, for example, any one of aluminum (Al), molybdenum (Mo), chromium (Cr), and tungsten (W), or an alloy containing one or more of these is used.

[0081] An insulating layer 25-2 is provided on the semiconductor layer 31, the source electrode 34, and the drain electrode 35. As the insulating layer 25-2, a transparent insulating material, for example, silicon nitride (SiN) is used.

[0082] return Figure 5 A plurality of transistors 24 included in the scanning line driving circuits 4-1 and 4-2 are provided in the peripheral area PA of the TFT substrate 10. The plurality of transistors 24 are each composed of a TFT and have the same structure as the TFT 9 included in the pixel PX. The transistor 24 is also referred to as a TFT.

[0083] An insulating layer 25 is provided on the TFT substrate 10, the TFT 9, and the TFT 24. As the insulating layer 25, a transparent insulating material such as silicon nitride (SiN) is used. The insulating layer 25 includes Figure 6 The gate insulating film 25-1 and the insulating layer 25-2 are shown.

[0084] Although not shown in the figure, a signal line SL extending in the Y direction is provided on the gate insulating film 25-1. The signal line SL is electrically connected to the source electrode of the TFT 9. In addition, a plurality of wirings connected to the source electrode and the drain electrode of the TFT 24 are provided on the gate insulating film 25-1.

[0085] A pixel electrode 26 is provided for each pixel PX on the insulating layer 25. The area of ​​the pixel electrode 26 is set to be slightly smaller than the area of ​​the pixel PX. The pixel electrode 26 is electrically connected to the drain electrode of the TFT 9 via a contact (not shown). The pixel electrode 26 is composed of a transparent electrode, for example, ITO (indium tin oxide).

[0086] An alignment film (not shown) for controlling the alignment of the liquid crystal layer 20 is provided on the pixel electrode 26 and the insulating layer 25. In the initial state of the alignment film liquid crystal layer 20, liquid crystal molecules are aligned vertically.

[0087] Next, the configuration of the CF substrate 13 side will be described.

[0088] A polarizing plate 27 is provided on the side of the CF substrate 13 opposite to the liquid crystal layer 20. The polarizing plate 27 is composed of a linear polarizing plate and has a transmission axis and an absorption axis that are orthogonal to each other. The transmission axis of the polarizing plate 27 is appropriately set according to the display mode (normally black mode or normally white mode) of the liquid crystal display device 1. For example, the polarizing plate 22 and the polarizing plate 27 are arranged so that their transmission axes are orthogonal to each other, that is, in an orthogonal Nicol state.

[0089] A light shielding layer (also called a black matrix or a black mask) 14 is provided on the liquid crystal layer 20 side of the CF substrate 13. The black matrix 14 is provided at the boundary of a plurality of pixels PX. The black matrix 14 is configured to cover the signal line SL, the scanning line GL, and the TFT 9 (particularly the semiconductor layer 15) when viewed from above. In addition, the black matrix 14 is provided at the boundary of color filters of different colors. The black matrix 14 has the function of shielding unnecessary light generated at the boundary of the pixel PX to improve the contrast.

[0090] Furthermore, the black matrix 14 is provided in the peripheral area PA and is provided to cover the entire peripheral area PA of the CF substrate 13. The black matrix 14 has a function of shielding external light incident from the side of the CF substrate 13. The black matrix 14 shields external light incident on the plurality of transistors 24 included in the scan line driving circuits 4-1 and 4-2.

[0091] The black matrix 14 is composed of, for example, a laminated film of a chromium oxide layer 14A and a chromium layer 14B. The chromium oxide layer 14A is disposed on the CF substrate 13 side, and the chromium layer 14B is disposed on the liquid crystal layer 20 side. The chromium oxide layer 14A mainly has the function of suppressing light incident from the CF substrate 13 side from being reflected by the black matrix 14. The chromium layer 14B mainly has the function of shielding light.

[0092] A color filter 28 is provided on the CF substrate 13 and the black matrix 14 in the display area DA. The color filter 28 includes a red filter 28R, a green filter 28G, and a blue filter 28B. A general color filter is composed of the three primary colors of light, namely red (R), green (G), and blue (B). The combination of the three adjacent colors of R, G, and B becomes a display unit (pixel), and any single-color part of R, G, and B in a pixel is the minimum driving unit called a sub-pixel. TFT9 and a pixel electrode 26 are provided for each sub-pixel. In the description of this specification, except for the case where it is particularly necessary to distinguish between pixels and sub-pixels, sub-pixels are also referred to as pixels. In this specification, when there is no need to specifically distinguish between the red filter 28R, the green filter 28G, and the blue filter 28B, they are referred to as color filters 28.

[0093] In addition, the pattern accuracy of a portion of the color filter formed in the outer peripheral portion of the entire color filter 28 may be low. Figure 5 In the example of FIG. 1 , a portion of the color filter formed at the boundary portion between the display area DA and the peripheral area PA is not used as a pixel.

[0094] Here, red colored resin layers 29 - 1 and 29 - 2 are provided on the black matrix 14 in the peripheral area PA. Figure 7 This is a plan view for explaining the configuration of the color resin layers 29 - 1 and 29 - 2 . When there is no need to distinguish between the color resin layers 29 - 1 and 29 - 2 , they are referred to as the color resin layer 29 .

[0095] The color resin layer 29 has a function of reducing the reflected light generated by the black matrix 14. The color resin layer 29 is composed of a resin mixed with a red pigment. The color resin layer 29 is formed by applying a photosensitive color resist mixed with a red pigment to the black matrix 14 and performing an exposure and development process. For example, the color resin layer 29 is composed of the same material as the red filter 28R.

[0096] The color resin layer 29-1 has an area covering at least the scanning line driving circuit 4-1. The end of the color resin layer 29-1 on the pixel array 2 side is arranged at the same position as the end of the scanning line driving circuit 4-1 on the pixel array 2 side, or at a position closer to the pixel array 2 side than the end of the scanning line driving circuit 4-1 on the pixel array 2 side. The end of the color resin layer 29-1 is in contact with the end of the color filter 28 (the color filter arranged at the endmost).

[0097] The color resin layer 29-2 has at least an area covering the scan line drive circuit 4-2. The end of the color resin layer 29-2 on the pixel array 2 side is arranged at the same position as the end of the scan line drive circuit 4-2 on the pixel array 2 side, or at a position closer to the pixel array 2 side than the end of the scan line drive circuit 4-2 on the pixel array 2 side. The end of the color resin layer 29-2 is in contact with the end of the color filter 28 (the color filter arranged at the endmost).

[0098] In addition, the color resin layer 29 may or may not be disposed on both sides of the pixel array 2 in the Y direction. Typically, the color resin layer 29 is not disposed on both sides of the pixel array 2 in the Y direction.

[0099] A common electrode 30 is provided on the color filter 28 and the color resin layer 29. The common electrode 30 has at least an area facing all the pixel electrodes 26. The common electrode 30 is made of a transparent electrode, for example, ITO.

[0100] An alignment film (not shown) for controlling the alignment of the liquid crystal layer 20 is provided on the common electrode 30. In the initial state of the alignment film liquid crystal layer 20, liquid crystal molecules are aligned vertically.

[0101] [1-3] Action

[0102] The operation of the liquid crystal display device 1 configured as described above will be described.

[0103] Figure 8 This is a graph for explaining an example of the frequency spectrum of the backlight 3 . Figure 8 The vertical axis represents relative intensity, and the horizontal axis represents wavelength (nm).

[0104] The backlight 3 includes a plurality of white LEDs and emits white light. The white light emitted by the backlight 3 has a peak at a wavelength of approximately 450 nm.

[0105] Fig. 9 This is a graph explaining the spectral transmittance of a color filter. Fig. 9 The vertical axis represents transmittance (%), and the horizontal axis represents wavelength (nm). Fig. 9 In FIG. 1 , “R” represents the spectral transmittance of the red filter 28R, “G” represents the spectral transmittance of the green filter 28G, and “B” represents the spectral transmittance of the blue filter 28B.

[0106] The red filter 28R transmits red light and transmits light in the wavelength range of about 610 to 750 nm. The green filter 28G transmits green light and transmits light in the wavelength range of about 500 to 560 nm. The blue filter 28B transmits blue light and transmits light in the wavelength range of about 435 to 480 nm.

[0107] Here, in this embodiment, a red colored resin layer 29 is provided on the black matrix 14 in the peripheral area PA. The spectral transmittance of the colored resin layer 29 is Fig. 9 The spectral transmittance of "R" is the same. Fig. 9 As can be understood, the transmittance of the color resin layer 29 to light having a wavelength of about 450 nm (blue light) is extremely low.

[0108] In the peripheral area PA, a large proportion of the light components in the white light emitted by the backlight 3 are absorbed by the color resin layer 29. Therefore, in the peripheral area PA, the light components (light intensity) reflected by the black matrix 14 are smaller. As a result, it is possible to suppress the reflected light reflected by the black matrix 14 from irradiating the transistors 24 (particularly the semiconductor layer) included in the scanning line driving circuits 4-1 and 4-2.

[0109] Fig.10 This is a graph for explaining the light intensity of the reflected light reflected by the black matrix 14 . Fig.10 The vertical axis represents light intensity (arbitrary units), and the horizontal axis represents wavelength (nm). Fig.10 In the figure, “R”, “G”, “B”, “No CF”, and “BL incident” represent the following spectroscopic results.

[0110] R: The light emitted from the backlight passes through the red filter and is reflected by the black matrix 14.

[0111] G: Splitting of light emitted from the backlight after passing through the green filter and being reflected by the black matrix 14

[0112] B: Splitting of light emitted from the backlight after passing through the blue filter and being reflected by the black matrix 14

[0113] Without CF: In the absence of a color filter (CF), the light emitted from the backlight is reflected by the black matrix 14 and then split into

[0114] BL incident: Split light incident from the backlight

[0115] As per Fig.10 As can be understood, the light transmitted through the red filter has a sufficiently low light intensity in the 400-570 nm band. Therefore, by providing the red colored resin layer 29 on the black matrix 14 in the peripheral area PA, it is possible to suppress the reflected light reflected by the black matrix 14 from irradiating the transistors 24 included in the scanning line driving circuits 4-1 and 4-2.

[0116] When the semiconductor layer of the transistor 24 is irradiated with light, a light leakage current is generated in the transistor 24. Due to the light leakage current, there is a possibility that the scanning line driving circuits 4-1 and 4-2 may malfunction.

[0117] Fig.11 This is a graph illustrating the spectral sensitivity of amorphous silicon. Fig.11 The vertical axis represents relative spectral sensitivity, and the horizontal axis represents wavelength (nm).

[0118] Amorphous silicon is used as the semiconductor layer of transistor 24. Fig.11 As can be understood, the spectral sensitivity of amorphous silicon has a peak at a wavelength of about 450 nm. The wavelength of the peak of the spectral sensitivity of amorphous silicon is substantially consistent with the wavelength of the peak of the light intensity of the backlight 3 .

[0119] In this embodiment, the peak of the light intensity of the backlight 3 can be absorbed by the color resin layer 29. This can further reduce the light leakage current of the transistor 24.

[0120] [1-4] Comparative Examples

[0121] Next, comparative examples will be described. Fig.12 is a cross-sectional view of a liquid crystal display device of a comparative example. Fig.12 The corresponding top view and Figure 4 same.

[0122] In the liquid crystal display device of the comparative example, in the peripheral area PA, the color resin layer 29 is not provided on the black matrix 14. In the peripheral area PA, the common electrode 30 is provided on the black matrix 14.

[0123] In the peripheral area PA, the white light emitted by the backlight 3 is reflected by the black matrix 14, and the reflected light reflected by the black matrix 14 is irradiated to the transistor 24 included in the scanning line driving circuit 4-1, 4-2. Therefore, in the comparative example, due to the light leakage current of the transistor 24, the scanning line driving circuit 4-1, 4-2 may malfunction. In the comparative example, the light intensity of the reflected light reflected by the black matrix 14 is Fig.10 The "No CF" indicates.

[0124] In contrast, in this embodiment, the red colored resin layer 29 can absorb the white light emitted by the backlight 3. This can reduce the light leakage current of the transistor 24, thereby suppressing malfunction of the scanning line driving circuits 4-1 and 4-2.

[0125] [1-5] Modifications

[0126] In the above embodiment, the color resin layer 29 provided in the peripheral area PA is composed of a single layer of red resin. As a modification, the color resin layer 29 may be composed of a green color resin layer. The green color resin layer is composed of the same material as the green filter 28G.

[0127] The light emitted from the backlight passes through the green filter and is reflected by the black matrix 14. Fig.10 The "G" indicates that Fig.10 As can be understood, the green filter has sufficiently low light intensity in the 400-480 nm band. That is, the green filter can absorb the peak of the wavelength around 450 nm in the white light emitted from the backlight. Therefore, in the modified example, the light leakage current of the transistor 24 can also be reduced.

[0128] In addition, the color resin layer 29 may be composed of a laminated film of a red color resin layer and a color resin layer of a color other than red. For example, the color resin layer 29 is composed of a laminated film of a red color resin layer and a green color resin layer. The green color resin layer is composed of a resin mixed with a green pigment. The green color resin layer is composed of the same material as the green filter 28G. According to this modification, the light absorption rate of the color resin layer 29 can be further improved.

[0129] In addition, the color resin layer 29 may be composed of a laminated film including three layers: a red color resin layer, a green color resin layer, and a blue color resin layer. The blue color resin layer is composed of a resin mixed with a blue pigment. The blue color resin layer is composed of the same material as the blue filter 28B. According to this modification, the light absorption rate of the color resin layer 29 can be further improved.

[0130] [1-6] Effects of the First Embodiment

[0131] In the first embodiment, in the peripheral area PA, a red colored resin layer 29 is provided on the black matrix 14. In the peripheral area PA, the red colored resin layer 29 can absorb the reflected light of the white light emitted by the backlight 3, which is reflected by the black matrix 14 toward the liquid crystal layer 20. Thus, it is possible to suppress the reflected light reflected by the black matrix 14 in the peripheral area PA from irradiating the plurality of transistors 24 included in the scanning line driving circuits 4-1 and 4-2.

[0132] In addition, the light leakage current of the transistor 24 formed of a TFT can be reduced. This can suppress malfunction of the scanning line driving circuits 4-1 and 4-2 including the shift register circuit. Furthermore, a liquid crystal display device capable of stable operation can be realized.

[0133] [2] Second Embodiment

[0134] The second embodiment is another configuration example of the color resin layer 29 and the color filter 28 .

[0135] Fig.13 is a cross-sectional view of a liquid crystal display device 1 according to a second embodiment of the present invention. Fig.13 The corresponding top view and Figure 4 as well as Figure 7 same.

[0136] A color filter 28 (including a plurality of red filters 28R, a plurality of green filters 28G, and a plurality of blue filters 28B) is provided in the display area DA. Red color resin layers 29-1 and 29-2 are provided on the black matrix 14 in the peripheral area PA. The color resin layers 29-1 and 29-2 each have an area covering at least the scanning line driving circuits 4-1 and 4-2.

[0137] The color resin layer 29-1 and the color filter 28 are not formed continuously. The color resin layer 29-1 and the color filter 28 are arranged at a distance without contacting each other. The configuration of the color resin layer 29-2 is also the same as that of the color resin layer 29-1.

[0138] In this way, the color resin layer 29 and the color filter 28 may be formed discontinuously. The area of ​​the color resin layer 29 can be arbitrarily set within the range of the peripheral area PA.

[0139] Fig.14 is a cross-sectional view of a liquid crystal display device 1 according to a modified example. Fig.14 The corresponding top view and Figure 4 same.

[0140] The case where the color resin layer 29-1 and the color filter 28 are arranged at a distance from each other is similar to the case where the color resin layer 29-1 and the color filter 28 are arranged at a distance from each other. Fig.13 The color resin layer 29-1 has at least an area covering the scanning line driving circuit 4-1. Moreover, the color resin layer 29-1 is arranged at a position closer to the pixel array 2 than the end of the scanning line driving circuit 4-1. That is, in a plan view, the color resin layer 29-1 is configured to cover the scanning line driving circuit 4-1 with a margin. The configuration of the color resin layer 29-2 is also the same as that of the color resin layer 29-1.

[0141] According to the modification, the light irradiating the transistors 24 included in the scanning line driving circuits 4 - 1 and 4 - 2 can be further reduced.

[0142] [3] Third Embodiment

[0143] The third embodiment is another configuration example of the scanning line driving circuit 4 .

[0144] Fig.15 It is a plan view for explaining the layout of a liquid crystal display device 1 according to the third embodiment of the present invention. Fig.16 It is a plan view for explaining the structure of the black matrix 14 according to the third embodiment.

[0145] Fig.17 This is a plan view for explaining the structure of the color resin layer 29 according to the third embodiment. Fig.15 as well as Fig.16 The cross-sectional view of the AA′ line Figure 5 Same. Figure 5 In the embodiment, the scanning line driving circuit 4-1 and the color resin layer 29-1 are replaced by the scanning line driving circuit 4 and the color resin layer 29, respectively. Fig.16 The black matrix 14 is represented by an inclined hatching line.

[0146] The liquid crystal display device 1 includes one scanning line driving circuit 4 . The scanning line driving circuit 4 is arranged, for example, on the left side of the pixel array 2 . All the scanning lines GL are connected to the scanning line driving circuit 4 .

[0147] The color resin layer 29 has at least an area covering the scan line driving circuit 4. The end of the color resin layer 29 on the pixel array 2 side is arranged at the same position as the end of the scan line driving circuit 4 on the pixel array 2 side, or at a position closer to the pixel array 2 side than the end of the scan line driving circuit 4 on the pixel array 2 side.

[0148] In this way, one scan line driving circuit 4 may be arranged only on one side of the pixel array 2. Furthermore, the color resin layer 29 is arranged to cover one scan line driving circuit 4. The color resin layer 29 may be arranged on the right side of the pixel array 2, or it may not be arranged. Typically, the color resin layer 29 is not arranged on the right side of the pixel array 2. In addition, the color resin layer 29 may be arranged on both sides of the pixel array 2 in the Y direction, or it may not be arranged. Typically, the color resin layer 29 is not arranged on both sides of the pixel array 2 in the Y direction.

[0149] According to the third embodiment, the same effects as those of the first embodiment can be obtained.

[0150] The present invention is not limited to the above-mentioned embodiments, and various modifications can be made in the implementation stage without departing from the scope of the main purpose. In addition, each embodiment can also be implemented in combination as appropriate, and the effect of the combination can be obtained in this case. In addition, the above-mentioned embodiments include various inventions, and various inventions can be extracted by combining selected from the disclosed multiple constituent elements. For example, in the case where deleting several constituent elements from all the constituent elements shown in the embodiment can also solve the problem and obtain the effect, the structure after the constituent elements are deleted can also be extracted as an invention.

[0151] Description of Reference Numerals

[0152] 1: liquid crystal display device, 2: pixel array, 3: backlight, 4: scan line drive circuit, 5: signal line drive circuit, 6: common electrode drive circuit, 7: voltage generation circuit, 8: control circuit, 9: TFT, 10: TFT substrate, 11: integrated circuit, 12: wiring, 13: CF substrate, 14: black matrix, 20: liquid crystal layer, 21: sealing material, 22: polarizing plate, 23: light shielding tape, 24: TFT, 25: insulating layer, 25-1: gate insulating film, 25-2: insulating layer, 26: pixel electrode, 27: polarizing plate, 28: color filter, 28R: red filter, 28G: green filter, 28B: blue filter, 29: color resin layer, 30: common electrode, 31: semiconductor layer, 32, 33: ohmic contact layer, 33: ohmic contact layer, 34: source electrode, 35: drain electrode.

Claims

1. A liquid crystal display device comprising: first and second substrates; A liquid crystal layer, sandwiched by the first and second substrates; A pixel array, arranged in the display area of ​​the first substrate, comprising a plurality of pixels; A plurality of scan lines, arranged on the pixel array; A scan line driving circuit is provided on the first substrate, configured in a peripheral area around the display area, connected to the plurality of scan lines, and includes a plurality of transistors; A black matrix, disposed on the second substrate, configured to shield the boundaries of the plurality of pixels and the peripheral area from light; as well as The color resin layer is disposed on the black matrix in the peripheral area.

2. The liquid crystal display device according to claim 1, wherein: The colored resin layer is red.

3. The liquid crystal display device according to claim 1, wherein: The color resin layer is composed of a laminated film of a red color resin layer and a color resin layer of a color other than red.

4. The liquid crystal display device according to claim 3, wherein: The color resin layer other than red is green.

5. The liquid crystal display device according to claim 1, wherein: The plurality of transistors each include a semiconductor layer composed of amorphous silicon.

6. The liquid crystal display device according to claim 1, wherein: The plurality of transistors are respectively formed of TFTs (Thin Film Transistors).

7. The liquid crystal display device according to claim 1, wherein: The black matrix is ​​formed by laminating a chromium oxide layer and a chromium layer in this order from the first substrate side.

8. The liquid crystal display device according to claim 1, wherein: A color filter is further provided in the display area of ​​the second substrate.

9. The liquid crystal display device according to claim 8, wherein: The color resin layer is arranged to be in contact with the color filter.

10. The liquid crystal display device according to claim 8, wherein: The invention further includes a common electrode provided on the color resin layer and the color filter.

11. The liquid crystal display device according to claim 1, wherein: A backlight is further provided for irradiating white light toward the first substrate.

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