Liquid crystal display device

Abstract

To provide a liquid crystal display device that can be operated stably.SOLUTION: A liquid crystal display device includes: first and second boards; a liquid crystal layer sandwiched by the first and second boards; a pixel array 2 that is disposed in a display area of the first board and includes multiple pixels; multiple scanning lines disposed in the pixel array 2; a scanning line drive circuit 4 that is provided on the first board, is disposed in a peripheral area around a display area, is connected to multiple scanning lines, and includes multiple transistors; a black matrix 14 that is provided on the second board and is configured so as to shield light in a boundary of multiple pixels and a peripheral area; and a color resin layer 29 disposed on the black matrix 14 in a peripheral area.SELECTED DRAWING: Figure 5

Description

Technical Field

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

Background Art

[0002] An active matrix liquid crystal display device includes a plurality of scan lines each extending in a row direction and to which a scan signal is input, a plurality of signal lines each extending in a column direction and to which an image signal is input, and a plurality of pixels respectively disposed in a plurality of intersection regions where the plurality of scan lines and the plurality of signal lines intersect. The plurality of pixels constitute a pixel array. Each pixel includes a thin film transistor (TFT: Thin Film Transistor) as an active element provided on a TFT substrate.

[0003] A liquid crystal display device in which a scan line driving circuit for driving a plurality of scan lines is disposed on one side of a pixel array is known. Such a structure is, for example, called a GIP (gate in panel) structure. The scan line driving circuit includes a shift register circuit for scanning a plurality of scan lines. The shift register circuit is configured 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 (referred to as a black matrix) is disposed above the scan line driving circuit. The black matrix is provided on a counter substrate facing the TFT substrate. The black matrix is configured to contain, for example, chromium having light shielding properties. In the black matrix configured in this way, light from a backlight is incident on the surface on the liquid crystal layer side, and the light incident on the black matrix from the backlight is reflected to the liquid crystal layer side. The reflected light reflected by the black matrix irradiates a plurality of TFTs included in the scan line driving circuit. When the TFTs are irradiated with light, a light leak current is generated, and there is a problem that the scan line driving circuit malfunctions.

Prior Art Documents

Patent Documents

[0005] [Patent Document 1] Japanese Patent Publication No. 2000-275676 [Overview of the project] [Problems that the invention aims to solve]

[0006] This invention provides a liquid crystal display device capable of stable operation. [Means for solving the problem]

[0007] According to a first aspect of the present invention, a liquid crystal display device is provided, comprising: first and second substrates; a liquid crystal layer sandwiched between the first and second substrates; a pixel array disposed in a display area of ​​the first substrate and including a plurality of pixels; a plurality of scan lines disposed in the pixel array; a scan line driving circuit provided on the first substrate, disposed in a peripheral area surrounding the display area, connected to the plurality of scan lines and including a plurality of transistors; a black matrix provided on the second substrate and configured to shield the boundaries of the plurality of pixels and the peripheral area from light; and a color resin layer disposed on the black matrix in the peripheral area.

[0008] According to a second aspect of the present invention, a liquid crystal display device according to the first aspect is provided, wherein the color resin layer is red.

[0009] According to a third aspect of the present invention, a liquid crystal display device according to the first aspect is provided, 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.

[0010] According to a fourth aspect of the present invention, a liquid crystal display device according to the third aspect is provided, wherein the color resin layer of a color other than red is green.

[0011] According to a fifth aspect of the present invention, a liquid crystal display device according to the first aspect is provided, wherein each of the plurality of transistors includes a semiconductor layer made of amorphous silicon.

[0012] According to a sixth aspect of the present invention, a liquid crystal display device according to the first aspect is provided, wherein each of the plurality of transistors is composed of a TFT (Thin Film Transistor).

[0013] According to a seventh aspect of the present invention, a liquid crystal display device according to the first aspect is provided, wherein the black matrix is ​​constructed by stacking a chromium oxide layer and a chromium layer in order from the first substrate side.

[0014] According to an eighth aspect of the present invention, a liquid crystal display device according to the first aspect is provided, further comprising a backlight that irradiates the first substrate with white light. [Effects of the Invention]

[0015] According to the present invention, a liquid crystal display device capable of stable operation can be provided. [Brief explanation of the drawing]

[0016] [Figure 1] Figure 1 is a block diagram of a liquid crystal display device according to the first embodiment of the present invention. [Figure 2] Figure 2 is a circuit diagram of the pixel array shown in Figure 1. [Figure 3] Figure 3 is a plan view illustrating the layout of the liquid crystal display device. [Figure 4] Figure 4 is a plan view illustrating the structure of the black matrix. [Figure 5] Figure 5 is a cross-sectional view of a liquid crystal display device along line AA' in Figure 4. [Figure 6] Figure 6 is a cross-sectional view of the TFT shown in Figure 5. [Figure 7] Figure 7 is a plan view illustrating the composition of the color resin layer. [Figure 8] Figure 8 is a graph illustrating an example of a backlight spectrum. [Figure 9] Figure 9 is a graph illustrating the spectral transmittance of the color filter. [Figure 10]FIG. 10 is a graph for explaining the light intensity of the reflected light reflected by the black matrix. [Figure 11] FIG. 11 is a graph for explaining the spectral sensitivity of amorphous silicon. [Figure 12] FIG. 12 is a cross-sectional view of the liquid crystal display device according to the comparative example. [Figure 13] FIG. 13 is a cross-sectional view of the liquid crystal display device according to the second embodiment of the present invention. [Figure 14] FIG. 14 is a cross-sectional view of the liquid crystal display device according to the modified example. [Figure 15] FIG. 15 is a plan view for explaining the layout of the liquid crystal display device according to the third embodiment of the present invention. [Figure 16] FIG. 16 is a plan view for explaining the configuration of the black matrix according to the third embodiment. [Figure 17] FIG. 17 is a plan view for explaining the configuration of the color resin layer according to the third embodiment.

BEST MODE FOR CARRYING OUT THE INVENTION

[0017] Hereinafter, embodiments will be described with reference to the drawings. However, the drawings are schematic or conceptual, and the dimensions and ratios of each drawing are not necessarily the same as the actual ones. Also, even when the same part is represented between the drawings, the dimensional relationships and ratios may be represented differently. In particular, several embodiments shown below are examples of devices and methods for embodying the technical idea of the present invention, and the technical idea of the present invention is not specified by the shape, structure, arrangement, etc. of the components. In the following description, elements having the same function and configuration are denoted by the same reference numerals, and redundant descriptions are omitted.

[0018] [1] First Embodiment [1-1] Overall Configuration of Liquid Crystal Display Device 1 Figure 1 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 comprises a pixel array 2, a backlight (illumination device) 3, a scan line drive circuit 4, a signal line drive circuit 5, a common electrode drive circuit 6, a voltage generation circuit 7, and a control circuit 8.

[0019] The pixel array 2 comprises multiple pixels PX arranged in a matrix. The pixel array 2 is provided with multiple scan lines GL1 to GLm, each extending in the row direction, and multiple signal lines SL1 to SLn, each extending in the column direction. "m" and "n" are integers of 2 or greater. Pixels PX are placed in the intersection regions of the scan lines GL and signal lines SL.

[0020] The backlight 3 is a surface light source that illuminates the back of the pixel array 2. For example, a direct-lit or side-lit (edge-lit) LED backlight can be used as the backlight 3. The backlight 3 is equipped with multiple white LEDs that emit white light.

[0021] The scan line drive circuit 4 is connected to multiple scan lines GL. Based on the control signal sent from the control circuit 8, the scan line drive circuit 4 sends a scan signal to the pixel array 2 to turn on / off the switching elements included in the pixel PX. The scan line drive circuit 4 includes a shift register circuit for sequentially scanning the multiple scan lines GL. The shift register circuit shifts the scan signal sequentially for the multiple scan lines for each frame period.

[0022] The signal line drive circuit 5 is electrically connected to multiple signal lines SL. The signal line drive circuit 5 receives control signals and display data from the control circuit 8. Based on the control signals, the signal line drive circuit 5 sends multiple grayscale signals (drive voltages) corresponding to the display data to the pixel array 2.

[0023] The common electrode drive circuit 6 generates a common voltage Vcom and supplies it to the common electrode in the pixel array 2. The voltage generation circuit 7 generates various voltages necessary for the operation of the liquid crystal display device 1 and supplies them to each circuit.

[0024] The control circuit 8 comprehensively controls the operation of the liquid crystal display device 1. The control circuit 8 receives image data DT and control signals CNT from an external source. Based on the image data DT, the control circuit 8 generates various control signals and sends these control signals to the corresponding circuits.

[0025] Figure 2 is a circuit diagram of the pixel array 2 shown in Figure 1. In Figure 2, the X direction is the row direction where the scan lines extend, and the Y direction is the column direction where the signal lines extend.

[0026] The pixel array 2 is provided with multiple scan lines GL1 to GLm and multiple signal lines SL1 to SLn.

[0027] Each pixel PX comprises a switching element (active element) 9, a liquid crystal capacitance (liquid crystal element) Clc, and a storage capacitance Cs. For example, a TFT (Thin Film Transistor) is used as the switching element 9, and an n-channel TFT is also used. Note that the source and drain of the transistor change depending on the direction of the current flowing through the transistor; however, the following explanation describes an example of the transistor's connection state. Of course, the source and drain are not fixed as their names suggest.

[0028] The source of the TFT9 is connected to the signal line SL, its gate is connected to the scan line GL, and its drain is connected to one electrode of the liquid crystal capacitor Clc. The liquid crystal capacitor Clc, as a liquid crystal element, consists of a pixel electrode, a common electrode, and a liquid crystal layer sandwiched between them. A common voltage Vcom is applied to the other electrode of the liquid crystal capacitor Clc by the common electrode driving circuit 6.

[0029] One electrode of the storage capacitance Cs is connected to one electrode of the liquid crystal capacitance Clc. A common voltage Vcom is applied to the other electrode of the storage capacitance Cs by a common electrode drive circuit 6. The storage capacitance Cs has the function of suppressing potential fluctuations occurring at the pixel electrode and maintaining the drive voltage applied to the pixel electrode until the drive voltage corresponding to the next signal is applied. The storage capacitance Cs is composed of a pixel electrode, a storage capacitance line, and an insulating layer sandwiched between them. A storage capacitance voltage different from the common voltage Vcom may be applied to the other electrode (storage capacitance line) of the storage capacitance Cs.

[0030] [1-2] Specific configuration of the liquid crystal display device 1 Next, the specific configuration of the liquid crystal display device 1 will be described. Figure 3 is a plan view illustrating the layout of the liquid crystal display device 1.

[0031] The liquid crystal display device 1 comprises a TFT substrate 10, a pixel array 2, two scan line driving circuits 4-1 and 4-2, and an integrated circuit (IC) 11. Scan line driving circuits 4-1 and 4-2 correspond to the scan line driving circuit 4 in Figure 1.

[0032] The TFT substrate 10 is made of a transparent and insulating substrate (for example, a glass substrate or a plastic substrate). A pixel array 2, scan line driving circuits 4-1 and 4-2, and an integrated circuit 11 are provided on the TFT substrate 10. A CF (color filter) substrate (not shown) is placed above the TFT substrate 10, and a liquid crystal layer (not shown) is placed between the TFT substrate 10 and the CF substrate.

[0033] The liquid crystal display device 1 has a display area DA and a peripheral area PA surrounding the display area DA. The display area DA is the area where the image is displayed. The peripheral area PA is the area where peripheral circuits that control the operation of the pixel array 2 are located.

[0034] A pixel array 2 is provided in the display area DA of the TFT substrate 10. The pixel array 2 is provided with a plurality of scan lines GL, each extending in the X direction, and a plurality of signal lines SL, each extending in the Y direction.

[0035] Scan line driving circuits 4-1 and 4-2 are provided in the peripheral region PA of the TFT substrate 10. Scan line driving circuits 4-1 and 4-2 are arranged on both sides of the pixel array 2 in the X direction, respectively. Scan line driving circuit 4-1 is connected to odd-numbered scan lines GL and drives the odd-numbered scan lines GL. Scan line driving circuit 4-2 is connected to even-numbered scan lines GL and drives the even-numbered scan lines GL.

[0036] An integrated circuit 11 is positioned at the Y-direction edge of the peripheral region PA of the TFT substrate 10. The integrated circuit 11 comprises a signal line drive circuit 5, a common electrode drive circuit 6, a voltage generation circuit 7, and a control circuit 8. The integrated circuit 11 is composed of an IC chip. Scan line drive circuits 4-1 and 4-2 are connected to the integrated circuit 11 using multiple wirings 12. Multiple signal lines SL are connected to the integrated circuit 11.

[0037] Next, the structure of the black matrix (also called the light-shielding layer) 14 will be explained. Figure 4 is a plan view illustrating the structure of the black matrix 14. In Figure 4, the black matrix 14 is indicated by diagonal hatching.

[0038] The liquid crystal display device 1 comprises a CF substrate 13 provided above the TFT substrate 10 and a black matrix 14 provided on the CF substrate 13. The CF substrate 13 is made of a transparent and insulating substrate (for example, 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. An integrated circuit 11 is arranged in the portion of the TFT substrate 10 that is longer than the CF substrate 13.

[0039] The black matrix 14 has the function of improving contrast by shielding 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 of multiple pixels PX. The squares arranged in a matrix in Figure 4 represent pixels PX. In Figure 4, red, green, and blue pixels (R, G, B in Figure 4) are shown by color hatching. In this embodiment, a stripe arrangement is shown as an example of the arrangement of color filters, but it is not limited to this, and any arrangement including mosaic arrangements and delta arrangements can be applied. The size of the pixel PX is actually considerably smaller than the size shown in the figure.

[0040] Furthermore, the black matrix 14 is positioned to cover the peripheral region PA. The peripheral region PA covered by the black matrix 14 corresponds to the frame of the liquid crystal display device 1. The frame is perceived by the observer as a black area. Elements (including transistors) placed in the peripheral region PA are shielded from light by the black matrix 14.

[0041] Next, the stacked structure of the liquid crystal display device 1 will be described. Figure 5 is a cross-sectional view of the liquid crystal display device 1 along line AA' in Figure 4. Note that Figure 5 mainly shows the left region of the liquid crystal display device 1 along the X direction, but the right region has a configuration that is a line symmetrical version of the configuration in Figure 5.

[0042] The liquid crystal display device 1 comprises a TFT substrate 10 on which switching elements (TFTs) and pixel electrodes are formed, and a CF substrate 13 which is positioned opposite the TFT substrate 10 and on which color filters and the like are formed.

[0043] 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 enclosed within a region surrounded by the TFT substrate 10, the CF substrate 13, and the sealing material 21. The sealing material 21 consists of, for example, an ultraviolet-curing resin, a thermosetting resin, or an ultraviolet / heat-curing resin, and is applied to the TFT substrate 10 or the CF substrate 13 during the manufacturing process, and then cured by ultraviolet irradiation or heating.

[0044] The liquid crystal material constituting the liquid crystal layer 20 has its optical properties changed by manipulating the orientation of the liquid crystal molecules in response to the applied electric field. In this embodiment, the VA (Vertical Alignment) mode will be described as an example. The liquid crystal mode is not limited to the VA mode, and the TN (Twisted Nematic) mode or homogeneous mode may also be used. In the VA mode, a negative-type (N-type) nematic liquid crystal with negative dielectric anisotropy is used as the liquid crystal layer 20. In its initial state, the liquid crystal layer 20 is vertically oriented. When there is no voltage (no electric field), the liquid crystal molecules are oriented almost perpendicular to the main surface of the substrate. When a voltage is applied (electric field is applied), the directors of the liquid crystal molecules tilt towards the horizontal direction (parallel to the main surface of the substrate).

[0045] Next, the configuration of the TFT substrate 10 will be 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 a linear polarizing plate and has mutually orthogonal transmission axes and absorption axes. The transmission axis of the polarizing plate 22 is set appropriately according to the display mode (normally black mode or normally white mode) of the liquid crystal display device 1.

[0046] A backlight 3 is positioned on the side of the polarizing plate 22 opposite to the TFT substrate 10. The backlight 3 is adhered to the polarizing plate 22 by a light-blocking tape 23. The light-blocking tape 23 is provided along the outer circumference of the backlight 3 and the polarizing plate 22 and has a frame shape. The light-blocking tape 23 has the function of blocking light and has adhesive on its top and bottom surfaces. The adhesive on the bottom surface of the light-blocking tape 23 adheres to the backlight 3, and the adhesive on the top surface of the light-blocking tape 23 adheres to the polarizing plate 22. The light-blocking tape 23 is made of, for example, black double-sided tape.

[0047] A switching element 9 is provided on the liquid crystal layer 20 side of the TFT substrate 10 for each pixel PX. For example, a TFT is used as the switching element 9, and an n-channel TFT is also used. The TFT 9 is also referred to as a transistor.

[0048] Figure 6 is a cross-sectional view of the TFT9 shown in Figure 5. The TFT9 is an inverted staggered type (also called a bottom gate type) in which the gate electrode is located below (on the substrate side) the source electrode and drain electrode. In this embodiment, a channel-etched type TFT will be used as an example. A channel-etched type TFT is a TFT manufactured by a method in which the semiconductor layer is also etched to some extent when processing the source electrode and drain electrode. The TFT9 may also be an etching stopper type. An etching stopper type TFT is a TFT manufactured by a method in which the source electrode and drain electrode are processed using an etching stopper layer formed on the semiconductor layer.

[0049] 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, one of aluminum (Al), molybdenum (Mo), chromium (Cr), and tungsten (W), or an alloy containing one or more of these, can be used.

[0050] A gate insulating film (also called an insulating layer) 25-1 is provided on the TFT substrate 10 and the gate electrode GL. A transparent insulating material is used as the gate insulating film 25-1, for example, silicon nitride (SiN) is used.

[0051] A semiconductor layer 31 is provided on the gate insulating film 25-1. For example, amorphous silicon is used as the semiconductor layer 31.

[0052] On the semiconductor layer 31, spaced apart ohmic contact layers 32 and 33 are provided. The ohmic contact layers 32 and 33 have the function of improving the electrical connection between the semiconductor layer 31 and the electrode. The ohmic contact layers 32 and 33 have a high concentration of n-type impurities introduced into them. + It is composed of a semiconductor layer.

[0053] A source electrode 34 is provided on the ohmic contact layer 32. A drain electrode 35 is provided on the ohmic contact layer 33. For the source electrode 34 and the drain electrode 35, for example, any of aluminum (Al), molybdenum (Mo), chromium (Cr), and tungsten (W), or an alloy containing one or more of these, can be used.

[0054] An insulating layer 25-2 is provided on the semiconductor layer 31, the source electrode 34, and the drain electrode 35. A transparent insulating material is used for the insulating layer 25-2, for example, silicon nitride (SiN).

[0055] Returning to Figure 5, the peripheral region PA of the TFT substrate 10 is provided with multiple transistors 24 included in the scan line driving circuits 4-1 and 4-2. Each of the multiple transistors 24 is composed of a TFT, and has the same configuration as the TFT 9 included in the pixel PX. Transistors 24 are also referred to as TFTs.

[0056] An insulating layer 25 is provided on the TFT substrate 10, TFT 9, and TFT 24. A transparent insulating material is used for the insulating layer 25, for example, silicon nitride (SiN). The insulating layer 25 includes the gate insulating film 25-1 and insulating layer 25-2 shown in Figure 6.

[0057] Although not shown in the diagram, 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, multiple wires connected to the source electrode and drain electrode of the TFT 24 are provided on the gate insulating film 25-1.

[0058] A pixel electrode 26 is provided on the insulating layer 25 for each pixel PX. 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 made of a transparent electrode, for example, ITO (indium tin oxide).

[0059] An alignment film (not shown) is provided on the pixel electrode 26 and the insulating layer 25 to control the orientation of the liquid crystal layer 20. The alignment film aligns the liquid crystal molecules vertically in the initial state of the liquid crystal layer 20.

[0060] Next, we will describe the configuration of the CF board 13. 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 a linear polarizing plate and has mutually orthogonal transmission axes and absorption axes. The transmission axis of the polarizing plate 27 is set appropriately according to the display mode (normally black mode or normally white mode) of the liquid crystal display device 1. For example, polarizing plates 22 and 27 are arranged so that their transmission axes are orthogonal to each other, i.e., in a cross-polarized state.

[0061] A light-shielding layer (also called a black matrix or 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 boundaries of multiple pixels PX. In a planar view, the black matrix 14 is arranged to cover the signal lines SL, scan lines GL, and TFT 9 (especially the semiconductor layer 15). The black matrix 14 is also placed at the boundaries of color filters of different colors. The black matrix 14 has the function of blocking unwanted light generated at the boundaries of pixels PX and improving contrast.

[0062] Furthermore, the black matrix 14 is provided in the peripheral region PA and is provided so as to cover the entire peripheral region PA of the CF substrate 13. The black matrix 14 has the function of blocking ambient light incident from the CF substrate 13 side. The black matrix 14 blocks ambient light incident on the multiple transistors 24 included in the scan line driving circuits 4-1 and 4-2.

[0063] The black matrix 14 is composed of a laminated film of, for example, a chromium oxide layer 14A and a chromium layer 14B. The chromium oxide layer 14A is located on the CF substrate 13 side, and the chromium layer 14B is located on the liquid crystal layer 20 side. The chromium oxide layer 14A mainly has the function of suppressing the reflection of light incident from the CF substrate 13 side by the black matrix 14. The chromium layer 14B mainly has the function of blocking light.

[0064] 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 comprises a red filter 28R, a green filter 28G, and a blue filter 28B. A typical color filter is composed of the three primary colors of light: red (R), green (G), and blue (B). A set of three adjacent R, G, and B colors forms a display unit (pixel), and the single-color portion of R, G, or B within a single pixel is called a subpixel (sub-pixel), which is the smallest driving unit. The TFT 9 and pixel electrode 26 are provided for each subpixel. In this specification, unless it is particularly necessary to distinguish between pixels and subpixels, subpixels will be referred to as pixels. In this specification, unless it is particularly necessary to distinguish between the red filter 28R, the green filter 28G, and the blue filter 28B, these will be referred to as the color filter 28.

[0065] Furthermore, some parts of the color filter formed on the outer periphery of the entire color filter 28 may have low pattern accuracy. For this reason, in the example in Figure 5, some parts of the color filter formed at the boundary between the display area DA and the peripheral area PA are not used as pixels.

[0066] Here, red color resin layers 29-1 and 29-2 are provided on the black matrix 14 in the peripheral region PA. Figure 7 is a plan view illustrating 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 color resin layer 29.

[0067] The color resin layer 29 has the function of reducing reflected light from the black matrix 14. The color resin layer 29 is composed of a resin mixed with red pigment. The color resin layer 29 is formed by applying a photosensitive color resist mixed with red pigment onto the black matrix 14, and then going through exposure and development processes. For example, the color resin layer 29 is composed of the same material as the red filter 28R.

[0068] The color resin layer 29-1 has an area that covers at least the scan line drive circuit 4-1. The end of the color resin layer 29-1 on the pixel array 2 side is the same as, or positioned closer to the pixel array 2 than, the end of the scan line drive 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 located at the very edge).

[0069] The color resin layer 29-2 has an area that covers at least the scan line drive circuit 4-2. The end of the color resin layer 29-2 on the pixel array 2 side is the same as, or positioned closer to the pixel array 2 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 located at the very edge).

[0070] The color resin layer 29 may or may not be placed on both sides of the pixel array 2 in the Y direction. Typically, the color resin layer 29 is not placed on both sides of the pixel array 2 in the Y direction.

[0071] A common electrode 30 is provided on the color filter 28 and the color resin layer 29. The common electrode 30 has an area that faces at least all of the pixel electrodes 26. The common electrode 30 is composed of a transparent electrode, for example, ITO.

[0072] An alignment film (not shown) is provided on the common electrode 30 to control the orientation of the liquid crystal layer 20. The alignment film aligns the liquid crystal molecules vertically in the initial state of the liquid crystal layer 20.

[0073] [1-3] Operation The operation of the liquid crystal display device 1 configured as described above will now be explained.

[0074] Figure 8 is a graph illustrating an example of the spectrum of backlight 3. In Figure 8, the vertical axis represents relative intensity, and the horizontal axis represents wavelength (nm).

[0075] Backlight 3 is equipped with multiple white LEDs and emits white light. The white light emitted by backlight 3 has a peak at a wavelength of around 450 nm.

[0076] Figure 9 is a graph illustrating the spectral transmittance of color filters. In Figure 9, the vertical axis represents transmittance (%), and the horizontal axis represents wavelength (nm). In Figure 9, "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.

[0077] The red filter 28R transmits red light, specifically light in the wavelength range of approximately 610-750 nm. The green filter 28G transmits green light, specifically light in the wavelength range of approximately 500-560 nm. The blue filter 28B transmits blue light, specifically light in the wavelength range of approximately 435-480 nm.

[0078] In this embodiment, a red color resin layer 29 is provided on the black matrix 14 in the peripheral region PA. The spectral transmittance of the color resin layer 29 is the same as the spectral transmittance of "R" in Figure 9. As can be seen from Figure 9, the color resin layer 29 has very low transmittance of light (blue light) around a wavelength of 450 nm.

[0079] In the peripheral PA region, a large proportion of the light component of the white light emitted by the backlight 3 is absorbed by the color resin layer 29. Therefore, in the peripheral PA region, the amount of light component (light intensity) reflected by the black matrix 14 is reduced. This suppresses the irradiation of the transistors 24 (especially the semiconductor layer) included in the scan line driving circuits 4-1 and 4-2 by the reflected light reflected by the black matrix 14.

[0080] Figure 10 is a graph illustrating the light intensity of the reflected light from the black matrix 14. In Figure 10, the vertical axis represents light intensity (in arbitrary units), and the horizontal axis represents wavelength (nm). In Figure 10, “R”, “G”, “B”, “No CF”, and “BL Incident” represent the following spectral distributions. R: Spectral view after light emitted from the backlight is reflected by the black matrix 14 via the red filter. G: Spectral view after light emitted from the backlight is reflected by the black matrix 14 via the green filter. B: The spectral distribution of light emitted from the backlight after it is reflected by the black matrix 14 via the blue filter. Without CF: Without a color filter (CF), the spectral distribution of light emitted from the backlight after reflection by the black matrix 14 is... BL incidence: Spectral light incident from the backlight

[0081] As can be seen from Figure 10, the light transmitted through the red filter has a sufficiently low light intensity in the wavelength band of 400-570 nm. Therefore, by providing a red color resin layer 29 on the black matrix 14 in the peripheral region PA, it is possible to suppress the reflected light reflected by the black matrix 14 from irradiating the transistors 24 included in the scan line driving circuits 4-1 and 4-2.

[0082] When light is shone on the semiconductor layer of transistor 24, an optical leakage current is generated in transistor 24. This optical leakage current may cause the scan line driving circuits 4-1 and 4-2 to malfunction.

[0083] Figure 11 is a graph illustrating the spectral sensitivity of amorphous silicon. In Figure 11, the vertical axis represents relative spectral sensitivity, and the horizontal axis represents wavelength (nm).

[0084] Amorphous silicon is used as the semiconductor layer of transistor 24. As can be seen from Figure 11, the spectral sensitivity of amorphous silicon has a peak at a wavelength of around 450 nm. The peak of the spectral sensitivity of amorphous silicon roughly coincides with the wavelength of the peak of the light intensity of backlight 3.

[0085] In this embodiment, the peak light intensity of the backlight 3 can be absorbed by the color resin layer 29. Therefore, the optical leakage current of the transistor 24 can be further reduced.

[0086] [1-4] Comparative Examples Next, a comparative example will be described. Figure 12 is a cross-sectional view of a liquid crystal display device according to the comparative example. The plan view corresponding to Figure 12 is the same as that of Figure 4.

[0087] In the comparative example liquid crystal display device, a color resin layer 29 is not provided on the black matrix 14 in the peripheral region PA. A common electrode 30 is provided on the black matrix 14 in the peripheral region PA.

[0088] In the peripheral PA region, the white light emitted by the backlight 3 is reflected by the black matrix 14, and the reflected light from the black matrix 14 irradiates the transistors 24 included in the scan line drive circuits 4-1 and 4-2. Therefore, in the comparative example, the scan line drive circuits 4-1 and 4-2 may malfunction due to the optical leakage current of the transistor 24. In the comparative example, the light intensity of the reflected light reflected by the black matrix 14 is represented as “without CF” in Figure 10.

[0089] In contrast, in this embodiment, the red color resin layer 29 can absorb the white light emitted by the backlight 3. This reduces the optical leakage current of the transistor 24, thereby suppressing malfunctions of the scan line drive circuits 4-1 and 4-2.

[0090] [1-5] Variant In the above embodiment, the color resin layer 29 provided in the peripheral region PA is composed of a single layer of red resin. As a modified example, 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.

[0091] The spectral distribution after light emitted from the backlight is reflected by the black matrix 14 via the green filter is shown as “G” in Figure 10. As can be seen from Figure 10, the green filter has a sufficiently low light intensity in the wavelength band of 400-480 nm. That is, the green filter can absorb the peak around 450 nm in the white light emitted from the backlight. Therefore, even in the modified example, the optical leakage current of transistor 24 can be reduced.

[0092] Furthermore, 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 may be 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 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 made higher.

[0093] Furthermore, the color resin layer 29 may be composed of a three-layer laminated film including 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 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 made higher.

[0094] [1-6] Effects of the first embodiment In the first embodiment, a red color resin layer 29 is provided on the black matrix 14 in the peripheral region PA. In the peripheral region PA, the red color resin layer 29 can absorb the reflected light that is reflected by the black matrix 14 towards the liquid crystal layer 20 from the white light emitted by the backlight 3. This suppresses the irradiation of multiple transistors 24 included in the scan line driving circuits 4-1 and 4-2 by the reflected light reflected by the black matrix 14 in the peripheral region PA.

[0095] Furthermore, the optical leakage current of the transistor 24, which is composed of TFTs, can be reduced. This suppresses malfunctions in the scan line driving circuits 4-1 and 4-2, which include the shift register circuit. Ultimately, this enables the realization of a liquid crystal display device that can operate stably.

[0096] [2] Second embodiment The second embodiment is another configuration example of the color resin layer 29 and the color filter 28.

[0097] Figure 13 is a cross-sectional view of a liquid crystal display device 1 according to a second embodiment of the present invention. The plan view corresponding to Figure 13 is the same as that of Figures 4 and 7.

[0098] A color filter 28 (including multiple red filters 28R, multiple green filters 28G, and multiple 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. Each of the color resin layers 29-1 and 29-2 has an area that covers at least the scan line drive circuits 4-1 and 4-2.

[0099] The color resin layer 29-1 and the color filter 28 are not formed to be continuous. The color resin layer 29-1 and the color filter 28 are not in contact and are arranged with a gap between them. The structure of the color resin layer 29-2 is the same as that of the color resin layer 29-1.

[0100] Thus, the color resin layer 29 and the color filter 28 do not need to be formed in a continuous manner. The area of ​​the color resin layer 29 can be arbitrarily set within the range that fits within the surrounding area PA.

[0101] Figure 14 is a cross-sectional view of a modified liquid crystal display device 1. The plan view corresponding to Figure 14 is the same as that of Figure 4.

[0102] The arrangement of the color resin layer 29-1 and the color filter 28 with a gap between them is the same as in Figure 13. The color resin layer 29-1 has an area that covers at least the scan line drive circuit 4-1. Furthermore, the color resin layer 29-1 is positioned on the pixel array 2 side of the edge of the scan line drive circuit 4-1. That is, in a plan view, the color resin layer 29-1 is configured to cover the scan line drive circuit 4-1 with a margin. The configuration of the color resin layer 29-2 is the same as that of the color resin layer 29-1.

[0103] According to the modified example, the amount of light irradiated onto the transistor 24 included in the scan line driving circuits 4-1 and 4-2 can be further reduced.

[0104] [3] Third embodiment The third embodiment is another configuration example of the scan line drive circuit 4.

[0105] Figure 15 is a plan view illustrating the layout of the liquid crystal display device 1 according to the third embodiment of the present invention. Figure 16 is a plan view illustrating the configuration of the black matrix 14 according to the third embodiment. Figure 17 is a plan view illustrating the configuration of the color resin layer 29 according to the third embodiment. The cross-sectional views along line AA' in Figures 15 and 16 are the same as those in Figure 5. In Figure 5, the scan line drive circuit 4-1 and the color resin layer 29-1 are replaced by the scan line drive circuit 4 and the color resin layer 29, respectively. In Figure 16, the black matrix 14 is shown with diagonal hatching.

[0106] The liquid crystal display device 1 includes one scan line driving circuit 4. The scan line driving circuit 4 is located, for example, on the left side of the pixel array 2. All scan lines GL are connected to the scan line driving circuit 4.

[0107] The color resin layer 29 has an area that covers at least the scan line drive circuit 4. The end of the color resin layer 29 on the pixel array 2 side is the same as, or positioned closer to the pixel array 2 than, the end of the scan line drive circuit 4 on the pixel array 2 side.

[0108] Thus, one scan line drive circuit 4 may be placed on only one side of the pixel array 2. The color resin layer 29 is then positioned to cover the one scan line drive circuit 4. The color resin layer 29 may or may not be placed on the right side of the pixel array 2. Typically, the color resin layer 29 is not placed on the right side of the pixel array 2. Furthermore, the color resin layer 29 may or may not be placed on both sides of the pixel array 2 in the Y direction. Typically, the color resin layer 29 is not placed on both sides of the pixel array 2 in the Y direction.

[0109] According to the third embodiment, the same effects as the first embodiment can be obtained.

[0110] The present invention is not limited to the embodiments described above, and can be modified in various ways during implementation without departing from its essence. Furthermore, each embodiment may be combined as appropriate, and in that case, the combined effects can be obtained. Moreover, the above embodiments include various inventions, and various inventions can be extracted by selecting combinations from the multiple constituent elements disclosed. For example, if the problem can be solved and effects obtained even if some constituent elements are deleted from all the constituent elements shown in the embodiment, then the configuration with these deleted constituent elements can be extracted as an invention. [Explanation of Symbols]

[0111] 1...Liquid crystal display device, 2...Pixel array, 3...Backlight, 4...Scan line driving circuit, 5...Signal line driving circuit, 6...Common electrode driving 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. First and second substrates, A liquid crystal layer sandwiched between the first and second substrates, The first substrate is arranged in a display area and includes a pixel array containing multiple pixels, Multiple scan lines arranged in the aforementioned pixel array, A scan line driving circuit is provided on the first substrate, arranged in the peripheral region surrounding the display area, connected to the plurality of scan lines, and includes a plurality of transistors, A black matrix is ​​provided on the second substrate and configured to shield the boundaries of the plurality of pixels and the surrounding region from light, A color resin layer is disposed on the black matrix in the peripheral region and configured to cover the plurality of transistors, It is equipped with, The black matrix is ​​constructed by stacking a chromium oxide layer and a chromium layer in order from the first substrate side. The aforementioned 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. LCD display device.

2. The color resin layer other than red is green. The liquid crystal display device according to claim 1.

3. The color resin layer is composed of a laminated film of a red color resin layer, a green color resin layer, and a blue color resin layer. The liquid crystal display device according to claim 1.

4. The second substrate further comprises a color filter provided in the display area, The color resin layer is arranged with a gap between it and the color filter. The liquid crystal display device according to claim 1.

5. Each of the aforementioned transistors includes a semiconductor layer made of amorphous silicon. The liquid crystal display device according to claim 1.

6. Each of the aforementioned transistors is composed of a TFT (Thin Film Transistor). The liquid crystal display device according to claim 1.

7. The first substrate is further provided with a backlight that illuminates it with white light. The liquid crystal display device according to claim 1.

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