TWI763430B - Touch display apparatus - Google Patents

Abstract

A touch display apparatus including a display panel and a plurality of touch electrodes is provided. The touch electrodes overlap the display panel and have a plurality of wire segments that intersect each other. A first spacing SP1 of any two adjacent ones of the wire segments arranged along a first direction satisfies the following relationship:

Description

touch display device

The present invention relates to a display device, and more particularly, to a touch display device.

In recent years, people's dependence on electronic products has increased day by day. In order to achieve the purpose of being more convenient, lighter and more user-friendly, the input devices of many information products have been changed from traditional keyboards or mice to touch panels, among which the display panels with touch function have become the most important part of today's mobile devices. Standard equipment. Due to its advantages of fast response, good reliability and high durability, capacitive touch technology has become the mainstream of touch technology, and is widely used in related electronic products (such as mobile phones, tablet computers or smart watches). According to the integration method of the touch technology and the display panel, capacitive touch display devices can be roughly classified into three types: out-cell, on-cell and in-cell.

Generally speaking, in an externally mounted or externally embedded touch display device, the touch electrode layer is disposed on the side of the display panel close to the user, so that the touch electrode can better sense the user's touch. . In order to increase the transmission speed (or the sensing frequency) of the sensing signal, most of the touch electrode layers are made of metal materials. However, the electrode patterns of the touch electrode layer (eg, metal mesh electrodes) and the light-shielding structure of the display panel are prone to generate moiré in the line of sight direction, resulting in a decrease in the display quality of the touch display device.

The present invention provides a touch display device with better display quality.

，其中PPI為顯示面板的每英寸畫素數量，B為1.8或2.1，且N為1或正偶數。 The touch display device of the present invention includes a display panel and a plurality of touch electrodes. The touch electrodes are overlapped on the display panel and have a plurality of wire segments intersecting with each other. The first spacing SP1 of any two adjacent ones of these wire segments arranged along the first direction satisfies the following relationship:

, where PPI is the number of pixels per inch of the display panel, B is 1.8 or 2.1, and N is 1 or a positive even number.

，其中第一方向相交於第二方向。 In an embodiment of the present invention, the second spacing SP2 of any two adjacent ones of the plurality of wire segments of the above-mentioned touch display device arranged along the second direction satisfies the following relationship:

, where the first direction intersects the second direction.

In an embodiment of the present invention, the first spacing SP1 of the above-mentioned touch display device is equal to the second spacing SP2.

。 In an embodiment of the present invention, the plurality of touch electrodes of the above-mentioned touch display device include a plurality of first touch electrodes and a plurality of second touch electrodes. The first touch electrodes have a plurality of first wire segments and a plurality of second wire segments intersecting with each other. The second touch electrodes have a plurality of third wire segments and a plurality of fourth wire segments intersecting with each other. The first wire segments and the third wire segments are alternately arranged along the first direction with a first pitch SP1. The second wire segments and the fourth wire segments are alternately arranged along the second direction with a second pitch SP2. The first direction intersects the second direction. The second spacing SP2 satisfies the following relation:

.

In an embodiment of the present invention, the display panel of the above-mentioned touch display device includes a light-shielding structure layer. The light-shielding structure layer has a plurality of first extending sections and a plurality of second extending sections intersecting with each other. The included angles between the respective extending directions of the plurality of wire segments of the plurality of touch electrodes and the extending directions of the first extending segments or the extending directions of the second extending segments are in the range of 25 degrees to 65 degrees.

In an embodiment of the present invention, the respective line widths of the plurality of wire segments of the above-mentioned touch display device are greater than 4 μm.

In an embodiment of the present invention, the B/N of the above-mentioned touch display device is 2.10, 1.80, 1.05, 0.90, 0.525 or 0.45.

In an embodiment of the present invention, the above-mentioned touch display device further includes a plurality of dummy electrodes disposed on the display panel overlappingly. These dummy electrodes are electrically insulated from the plurality of touch electrodes, and have a plurality of dummy wire segments intersecting with each other. Some of the dummy wire segments are arranged along the first direction with a first pitch SP1.

，

， 其中t為基板的厚度，n1為保護層的折射率，n2為基板的折射率，PPI為顯示面板的每英寸畫素數量，B為1.8或2.1，且N為1或正偶數。 The touch display device of the present invention includes a display panel, a plurality of touch electrodes and a protective layer. The display panel is suitable for the user to watch with the viewing angle θ1 and the viewing distance D. The display panel includes a substrate and a light-shielding structure layer. The substrate has opposing first and second sides. The light-shielding structure layer is disposed on the first side of the substrate. The touch electrodes are disposed on the second side of the substrate and overlap the light-shielding structure layer. The touch electrodes have a plurality of wire segments intersecting with each other. The protective layer is disposed on the second side of the substrate and covers the touch electrodes and the substrate. The first spacing SP1 of any two adjacent ones of these wire segments arranged along the first direction satisfies the following relationship:

,

, where t is the thickness of the substrate, n1 is the refractive index of the protective layer, n2 is the refractive index of the substrate, PPI is the number of pixels per inch of the display panel, B is 1.8 or 2.1, and N is 1 or a positive even number.

，其中第一方向相交於第二方向。 In an embodiment of the present invention, the second spacing SP2 of any two adjacent ones of the plurality of wire segments of the above-mentioned touch display device arranged along the second direction satisfies the following relationship:

, where the first direction intersects the second direction.

In an embodiment of the present invention, the first spacing SP1 of the above-mentioned touch display device is equal to the second spacing SP2.

。 In an embodiment of the present invention, the plurality of touch electrodes of the above-mentioned touch display device include a plurality of first touch electrodes and a plurality of second touch electrodes. The first touch electrodes have a plurality of first wire segments and a plurality of second wire segments intersecting with each other. The second touch electrodes have a plurality of third wire segments and a plurality of fourth wire segments intersecting with each other. The first wire segments and the third wire segments are alternately arranged along the first direction with a first pitch SP1. The second wire segments and the fourth wire segments are alternately arranged along the second direction with a second pitch SP2. The first direction intersects the second direction. The second spacing SP2 satisfies the following relation:

.

In an embodiment of the present invention, the light-shielding structure layer of the above-mentioned touch display device has a plurality of first extending sections and a plurality of second extending sections intersecting with each other. The included angles between the respective extending directions of the plurality of wire segments of the plurality of touch electrodes and the extending directions of the first extending segments or the extending directions of the second extending segments are in the range of 25 degrees to 65 degrees.

In an embodiment of the present invention, the respective line widths of the plurality of wire segments of the above-mentioned touch display device are greater than 4 μm.

In an embodiment of the present invention, the B/N of the above-mentioned touch display device is 2.10, 1.80, 1.05, 0.90, 0.525 or 0.45.

In an embodiment of the present invention, the above-mentioned touch display device further includes a plurality of dummy electrodes disposed on the display panel overlappingly. These dummy electrodes are electrically insulated from the plurality of touch electrodes, and have a plurality of dummy wire segments intersecting with each other. Some of the dummy wire segments are arranged along the first direction with a first pitch SP1.

至

的範圍內，可有效抑制這些觸控電極與顯示面板重疊時產生的摩爾紋現象，從而提升觸控顯示裝置的顯示品質，其中PPI為顯示面板的每英寸畫素數量，B為1.8或2.1，且N為1或正偶數。另一方面，透過將上述的特定間距設定在

至

的範圍內，可改善上述摩爾紋在大視角和短視距觀看時惡化的現象，其中∆p為具有視角和視距相依性的補償值。 Based on the above, in the touch display device according to an embodiment of the present invention, some wire segments of the plurality of touch electrodes are arranged along a direction with a specific pitch. By setting this specific spacing at

to

Within the range of , it can effectively suppress the moiré phenomenon generated when these touch electrodes overlap the display panel, thereby improving the display quality of the touch display device, where PPI is the number of pixels per inch of the display panel, B is 1.8 or 2.1, And N is 1 or a positive even number. On the other hand, by setting the above-mentioned specific spacing in

to

Within the range of , it can improve the above-mentioned deterioration of moiré at large viewing angles and short viewing distances, where Δp is a compensation value that is dependent on viewing angles and viewing distances.

As used herein, "about", "approximately", "substantially", or "substantially" includes the stated value and the average value within an acceptable deviation of the particular value as determined by one of ordinary skill in the art, taking into account all The measurement in question and the specific amount of error associated with the measurement (ie, the limitations of the measurement system). For example, "about" can mean within one or more standard deviations of the stated value, or within ±30%, ±20%, ±15%, ±10%, ±5%, for example. Furthermore, the terms "about", "approximately", "substantially", or "substantially" as used herein may depend on measurement properties, cutting properties, or other properties to select a more acceptable range or standard deviation, and may Not one standard deviation applies to all properties.

In the drawings, the thickness of layers, films, panels, regions, etc., are exaggerated for clarity. It will be understood that when an element such as a layer, film, region or substrate is referred to as being "on" or "connected to" another element, it can be directly on or connected to the other element, or Intermediate elements may also be present. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element, there are no intervening elements present. As used herein, "connected" may refer to a physical and/or electrical connection. Furthermore, the "electrical connection" may refer to the existence of other elements between the two elements.

Reference will now be made in detail to exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numerals are used in the drawings and description to refer to the same or like parts.

FIG. 1 is a schematic top view of a touch display device according to an embodiment of the present invention. FIG. 2 is an enlarged view of a partial region R of the touch display device of FIG. 1 . FIG. 3 is a schematic cross-sectional view of the touch display device of FIG. 2 . FIG. 4 is a distribution diagram of the visibility of moiré patterns of the touch display device of FIG. 1 against the distance between any two adjacent wire segments. 5 is a distribution diagram of the visibility of moiré patterns of the touch display device according to another embodiment of the present invention versus the spacing between any two adjacent wire segments. FIG. 6 is a distribution diagram of the visibility degree of moiré patterns of the touch display device of FIG. 1 with respect to different viewing angles and different viewing distances.

For the sake of clarity, FIG. 1 only illustrates the touch sensing layer 200 and the second substrate 112 of FIG. 3 . FIG. 2 only shows the touch sensing layer 200 , the second substrate 112 and the black matrix BM of FIG. 3 . On the other hand, in order to clearly distinguish different metal conductive layers, the wire segments of the first touch electrode TE1 and the first dummy electrode DE1 and the wire segments of the second touch electrode TE2 and the second dummy electrode DE2 in FIG. 2 are respectively Drawing with lines of different thicknesses does not mean that the actual width of these electrodes is limited by the content of the drawings. For example, in this embodiment, the line widths of the respective wire segments of the electrodes are substantially the same, but not limited thereto.

Referring to FIG. 1 to FIG. 3 , the touch display device 10 includes a display panel 100 and a touch sensing layer 200 which are arranged to overlap with each other. In this embodiment, the touch sensing layer 200 is disposed on one side of the display surface DS of the display panel 100 . That is to say, the touch display device 10 is, for example, an on-cell touch display device, but not limited thereto. In other embodiments, the touch display device may also be an externally mounted touch display device.

In this embodiment, the display panel 100 includes a first substrate 111 , a second substrate 112 , a pixel circuit layer 120 , a display medium layer 150 and a black matrix BM. The display medium layer 150 is disposed between the first substrate 111 and the second substrate 112 . The pixel circuit layer 120 is disposed between the first substrate 111 and the display medium layer 150 . The black matrix BM is disposed between the display medium layer 150 and the second substrate 112 . The material of the first substrate 111 and the second substrate 112 may include glass, quartz, high molecular polymer, or other suitable light-transmitting substrates. The display medium layer 150 is, for example, a liquid crystal layer or a light-emitting element layer.

For example, the pixel circuit layer 120 may include a plurality of signal lines SL and a plurality of active elements (not shown). A part of the signal lines SL are arranged along the direction X and extend in the direction Y, and the other part of the signal lines SL are arranged along the direction Y and extend in the direction X. The signal lines SL intersecting with each other can define a plurality of pixel regions, and these pixel regions are respectively provided with a plurality of display pixels (not shown) of the display panel 100 . The arrangement of these active elements enables these display pixels to receive display signals through corresponding signal lines, so as to individually control the display gray scales of these display pixels. In this embodiment, the signal lines SL may include scan lines and data lines, but not limited thereto. In other embodiments, the signal lines SL may further include power lines, reset lines, or other signal lines suitable for self-luminous display panels. Based on the consideration of electrical conductivity, the signal line SL is generally made of metal materials (eg, molybdenum, aluminum, copper, titanium, the above-mentioned alloys, or the above-mentioned combinations).

In this embodiment, the black matrix BM disposed on the second substrate 112 overlaps the aforementioned plurality of signal lines SL along the normal direction (eg, the direction Z) of the display surface DS. The black matrix BM has a plurality of first extension sections BMa and a plurality of second extension sections BMb, the first extension sections BMa intersect with the second extension sections BMb, and define a plurality of openings corresponding to the foregoing plurality of pixel regions OP. For example, a plurality of color filter patterns (not shown) may be provided in the openings OP of the black matrix BM. These color filter patterns are suitable for passing different color lights to achieve the effect of color display.

In order to prevent the light of two adjacent pixels from interfering with each other, the black matrix BM is generally made of a light-shielding material, such as black resin material, metal, or other suitable light-shielding material. Since the plurality of signal lines SL in this embodiment are completely shielded by the black matrix BM in the line of sight direction (eg, the opposite direction of the direction Z), the light shielding structure layer of the display panel 100 is only defined by the black matrix BM. However, the present invention is not limited thereto. According to other embodiments, the black matrix of the display panel only shields part of the signal lines SL. Therefore, a part of the light shielding structure layer is defined by the part of the signal lines SL not shielded by the black matrix. That is, the light-shielding structure layer of the display panel can be defined by the signal line SL, the black matrix, or a combination thereof.

On the other hand, the touch sensing layer 200 of this embodiment may include two metal conductive layers and an insulating layer 210 disposed between the two metal conductive layers. The two metal conductive layers are respectively provided with a plurality of touch electrodes of the touch sensing layer 200 . For example, one of the two metal conductive layers has a plurality of first touch electrodes TE1, and the other has a plurality of second touch electrodes TE2. The first touch electrodes TE1 are arranged along the direction Y and extend in the direction X. The second touch electrodes TE2 are arranged along the direction X and extend in the direction Y (as shown in FIG. 1 ). Based on the consideration of conductivity, the touch electrodes of this embodiment use metal materials. In order to reduce the loss of light energy caused by the light emitted by the display panel 100 being blocked by the opaque touch electrodes, the touch electrodes made of metal materials mostly have a grid-like configuration in the direction of sight (as shown in FIG. 2 ). .

More specifically, the touch sensing layer 200 of this embodiment is a double metal mesh structure, but not limited thereto. In other embodiments, the touch sensing layer may also be a single metal mesh structure. That is to say, the above-mentioned first touch electrodes TE1 and second touch electrodes TE2 can also be selectively fabricated on the same metal conductive layer, and at the intersection of the two touch electrodes TE1 and TE2, the two touch electrodes TE1 and TE2 are bridging. One of the two touch electrodes TE1 and TE2 is crossed. In order to increase the tolerance of the touch sensing layer 200 to touch operations, the touch sensing layer 200 may further include a protective layer 220 covering the touch electrodes.

Referring to FIG. 2 and FIG. 3 , in this embodiment, the first touch electrode TE1 has a plurality of conductive segments TE1a and TE1b intersecting with each other. These wire segments TE1a are aligned along the direction Y' and extend in the direction X'. These wire segments TE1b are arranged along the direction X' and extend in the direction Y'. Similarly, the second touch electrode TE2 has a plurality of wire segments TE2a and TE2b intersecting with each other. These wire segments TE2a are aligned along the direction Y' and extend in the direction X'. These wire segments TE2b are arranged along the direction X' and extend in the direction Y'.

Since the touch electrodes of this embodiment are made of metal materials, a light-shielding effect similar to that of the light-shielding structure layer (eg, the black matrix BM) of the display panel 100 is produced. Therefore, in the line of sight direction (for example, the reverse direction of the direction Z), the light-shielding structure layer of the display panel 100 and the touch electrodes of the touch sensing layer 200 are likely to generate moiré because they have a periodically arranged structure with each other. (moiré). For example, in this embodiment, the line widths (for example, the line width W1 and the line width W2) of the wire segments of the touch electrodes (for example, the wire segment TE1a, the wire segment TE1b, the wire segment TE2a, and the wire segment TE2b) are greater than 4 microns.

In order to preliminarily avoid the serious moiré phenomenon, the wire segments of the touch electrodes in this embodiment are neither parallel nor perpendicular to the first extension segment BMa and the second extension segment BMb of the black matrix BM of the display panel 100 . For example, in this embodiment, the angle α1 between the wire segment TE1a of the first touch electrode TE1 and the first extension segment BMa of the black matrix BM and the angle α1 between the wire segment TE2a of the second touch electrode TE2 and the black matrix BM The included angle α2 between the first extension sections BMa is in the range of 25 degrees to 65 degrees. Similarly, the angle β1 between the wire segment TE1b of the first touch electrode TE1 and the second extension segment BMb of the black matrix BM and the angle β1 between the wire segment TE2b of the second touch electrode TE2 and the second extension segment BMb of the black matrix BM are similar. The included angles β2 are all in the range of 25 degrees to 65 degrees.

It should be noted that, at the intersection (or overlap) of the first touch electrode TE1 and the second touch electrode TE2, the plurality of wire segments TE1a of the first touch electrode TE1 and the plurality of the second touch electrode TE2 The wire segments TE2a are alternately arranged along the direction Y' with a pitch SP1a, while the plurality of wire segments TE1b of the first touch electrode TE1 and the plurality of wire segments TE2b of the second touch electrode TE2 are alternately arranged along the direction X' with a pitch SP2a . The distance between any two adjacent wire segments here refers to the shortest distance between the two wire segments.

至

的範圍內，可有效抑制這些觸控電極與顯示面板重疊時產生的摩爾紋現象，從而提升觸控顯示裝置10的顯示品質。此處的PPI為顯示面板100的每英寸畫素數量，B為1.80或2.10，且N為1或正偶數。舉例來說，B/N可以是2.10、1.80、1.05、0.90、0.525或0.45，但不以此為限。在一較佳的實施例中，N可以是小於等於10的正偶數。在一最佳的實施例中，N可以是小於等於6的正偶數。 By setting the spacing SP1a of the adjacent conductor segments TE1a and TE2a arranged along the direction Y' and the spacing SP2a of the adjacent conductor segments TE1b and TE2b arranged along the direction X'

to

Within the range, the moiré phenomenon generated when the touch electrodes overlap the display panel can be effectively suppressed, thereby improving the display quality of the touch display device 10 . Here, PPI is the number of pixels per inch of the display panel 100 , B is 1.80 or 2.10, and N is 1 or a positive even number. For example, B/N may be 2.10, 1.80, 1.05, 0.90, 0.525 or 0.45, but not limited thereto. In a preferred embodiment, N may be a positive even number less than or equal to 10. In a preferred embodiment, N can be a positive even number less than or equal to 6.

In this embodiment, the PPI of the display panel 100 is, for example, 52.1. Therefore, when the distance between any two adjacent wire segments of the touch electrode (for example, the distance SP1a and the distance SP2a) is set between 227.5 microns and 236.8 microns, between 265.4 microns and 276.3 microns, and between 455 microns and 473.6 microns , 530.8 microns to 552.5 microns, 901.4 microns to 938.2 microns, or 1061.7 microns to 1105 microns, the visibility of moiré can be significantly reduced (as shown in Figure 4). In particular, when the PPI of the display panel is increased to 104.2 by an even multiple, the distance between any two adjacent wire segments of the touch electrodes can also be set between 227.5 μm and 236.8 μm and between 265.4 μm and 276.3 μm. between 455 microns and 473.6 microns to reduce the visibility of moiré (as shown in Figure 5).

Please refer to FIG. 1 at the same time, in order to reduce the visibility of the moiré pattern, a plurality of dummy electrodes may be selectively disposed between any two adjacent touch electrodes. For example, the plurality of first touch electrodes TE1 and the plurality of first dummy electrodes DE1 are alternately arranged along the direction Y and are electrically insulated from each other. The plurality of second touch electrodes TE2 and the plurality of second dummy electrodes DE2 are alternately arranged along the direction X and are electrically insulated from each other. In this embodiment, the first dummy electrodes DE1 and the first touch electrodes TE1 belong to the same metal conductive layer, and the second dummy electrodes DE2 and the second touch electrodes TE2 belong to the same metal conductive layer, but not limited thereto.

To increase light transmittance, these dummy electrodes may also have a grid-like configuration. It is particularly noted that the grid-like structures of the touch electrodes and the dummy electrodes can be fabricated in the same lithography and etching process, and multiple disconnections (as shown in FIG. 2 ) are arranged to ensure that the touch electrodes are connected to the Electrical independence between dummy electrodes.

In this embodiment, the first dummy electrode DE1 has a plurality of dummy wire segments DE1a and a plurality of dummy wire segments DE1b intersecting with each other, the dummy wire segments DE1a are arranged along the direction Y' and extend in the direction X', and these dummy wire segments DE1a The dummy wire segments DE1b are arranged along the direction X' and extend in the direction Y'. The second dummy electrode DE2 has a plurality of dummy wire segments DE2a and a plurality of dummy wire segments DE2b intersecting with each other, the dummy wire segments DE2a are arranged along the direction Y' and extend in the direction X', and the dummy wire segments DE2b are along the The direction X' is aligned and extends in the direction Y'.

It should be noted that, at the intersection (or overlap) of the first dummy electrode DE1 and the second touch electrode TE2, the plurality of dummy wire segments DE1a of the first dummy electrode DE1 and the plurality of wires of the second touch electrode TE2 The segments TE2a are alternately arranged along the direction Y' with the spacing SP1b, and the plurality of dummy wire segments DE1b of the first dummy electrode DE1 and the plurality of wire segments TE2b of the second touch electrode TE2 are alternately arranged along the direction X' with the spacing SP2b. Similarly, at the intersection (or overlap) of the second dummy electrode DE2 and the first touch electrode TE1, the plurality of dummy wire segments DE2a of the second dummy electrode DE2 and the plurality of wire segments TE1a of the first touch electrode TE1 The plurality of dummy wire segments DE2b of the second dummy electrode DE2 and the plurality of wire segments TE1b of the first touch electrode TE1 are alternately arranged along the direction X' with the interval SP2c.

On the other hand, at the overlap of the first dummy electrode DE1 and the second dummy electrode DE2, the plurality of dummy wire segments DE1a of the first dummy electrode DE1 and the plurality of dummy wire segments DE2a of the second dummy electrode DE2 are along the direction Y' The plurality of dummy conductive segments DE1b of the first dummy electrode DE1 and the plurality of dummy conductive segments DE2b of the second dummy electrode DE2 are alternately arranged with the interval SP2d along the direction X'.

In this embodiment, the above-mentioned pitch SP1a, pitch SP2a, pitch SP1b, pitch SP2b, pitch SP1c, pitch SP2c, pitch SP1d, and pitch SP2d may be selectively the same. Therefore, when these pitches are all set between 227.5 microns to 236.8 microns, 265.4 microns to 276.3 microns, 455 microns to 473.6 microns, 530.8 microns to 552.5 microns, 901.4 microns to 938.2 microns, or 1061.7 When the thickness is between microns and 1105 microns, the visibility of the moiré in the line of sight direction of the touch electrodes, the dummy electrodes and the light shielding structure layer of the display panel can be significantly reduced.

Referring to FIG. 3 , in this embodiment, the black matrix BM (ie the light shielding structure layer) and the touch sensing layer 200 are respectively located on opposite sides (ie the first side and the second side) of the second substrate 112 . Since the second substrate 112 has a certain thickness t (eg, 0.5 mm) along the normal direction of the display surface DS (eg, the direction Z), when the user USR views the touch display device with a larger side viewing angle and a shorter viewing distance 10, the visibility of the moiré pattern will increase. This is because the thickness t of the second substrate 112 will cause the arrangement spacing of the plurality of wire segments of the touch electrodes to be different from the front view due to the refraction effect of the second substrate 112 at a larger side viewing angle and a shorter viewing distance. Arrange spacing.

For example, when the user USR watches the touch display device 10 with a larger viewing angle θ1 and a shorter viewing distance D, the refraction effect of the second substrate 112 on light will cause any two adjacent wire segments of the touch electrodes The actual pitches (eg, the pitch SP1a and the pitch SP2a) form visually larger pitches (eg, the pitch SP1a' and the pitch SP2a') on the side of the second substrate 112 where the black matrix BM is provided. The difference between the visual spacing and the actual spacing comes from the difference in the optical path offsets generated by the light incident at different angles and passing through the second substrate 112. For example, the optical path offset d1 of the light LB1 is smaller than the optical path offset d1 of the light LB2. Light path offset d2. Therefore, the problem of moiré deterioration occurs in the touch display device 10 under a larger viewing angle and a shorter viewing distance.

Please refer to FIG. 6 at the same time, when the viewing distance of the user is less than 50 cm, the aforementioned difference of the optical path offset (ie d2-d1) will increase with the increase of the viewing angle. Correspondingly, the visibility of the moiré pattern will gradually increase, resulting in the deterioration of display quality at large viewing angles and short viewing distances.

至

的範圍內，其中

， n1為保護層220的折射率，n2為第二基板112的折射率。 Therefore, in order to suppress the change of the moiré visibility of the touch display device at different viewing angles θ1 and different viewing distances D, the distance between any two adjacent wire segments of the touch sensing layer of the touch display device, the distance between any two phases, and the The spacing between adjacent dummy wire segments and the spacing between any adjacent wire segments and dummy wire segments can be set in

to

within the range of which

, n1 is the refractive index of the protective layer 220 , and n2 is the refractive index of the second substrate 112 .

至

的範圍內，可有效抑制這些觸控電極與顯示面板重疊時產生的摩爾紋現象，從而提升觸控顯示裝置的顯示品質，其中PPI為顯示面板的每英寸畫素數量，B為1.8或2.1，且N為1或正偶數。另一方面，透過將上述的特定間距設定在

至

的範圍內，可改善上述摩爾紋在大視角和短視距觀看時惡化的現象，其中∆p為具有視角和視距相依性的補償值。 To sum up, in the touch display device according to an embodiment of the present invention, some wire segments of the plurality of touch electrodes are arranged along a direction with a specific pitch. By setting this specific spacing at

to

Within the range of , it can effectively suppress the moiré phenomenon generated when these touch electrodes overlap the display panel, thereby improving the display quality of the touch display device, where PPI is the number of pixels per inch of the display panel, B is 1.8 or 2.1, And N is 1 or a positive even number. On the other hand, by setting the above-mentioned specific spacing in

to

Within the range of , it can improve the above-mentioned deterioration of moiré at large viewing angles and short viewing distances, where Δp is a compensation value that is dependent on viewing angles and viewing distances.

10: Touch display device 100: Display panel 111, 112: Substrate 120: pixel circuit layer 150: Display medium layer 200: touch sensing layer 210: Insulation layer 220: protective layer BM: black matrix BMa: first extension BMb: second extension D: sight distance d1, d2: light path offset DE1, DE2: Dummy electrodes DE1a, DE1b, DE2a, DE2b: Dummy wire segments DS: Display surface LB1, LB2: light OP: opening R: area SL: signal line SP1a, SP2a, SP1a', SP2a', SP1b, SP2b, SP1c, SP2c, SP1d, SP2d, SP1e, SP2e, SP1f, SP2f: Spacing t: thickness TE1, TE2: touch electrodes TE1a, TE1b, TE2a, TE2b: Conductor segments USR: user W1, W2: line width X, Y, X', Y', Z: direction α1, α2, β1, β2: included angle θ1: angle of view

FIG. 1 is a schematic top view of a touch display device according to an embodiment of the present invention. FIG. 2 is an enlarged view of a partial area of the touch display device of FIG. 1 . FIG. 3 is a schematic cross-sectional view of the touch display device of FIG. 2 . FIG. 4 is a distribution diagram of the visibility of moiré patterns of the touch display device of FIG. 1 against the distance between any two adjacent wire segments. 5 is a distribution diagram of the visibility of moiré patterns of the touch display device according to another embodiment of the present invention versus the spacing between any two adjacent wire segments. FIG. 6 is a distribution diagram of the visibility degree of moiré patterns of the touch display device of FIG. 1 with respect to different viewing angles and different viewing distances.

10: Touch display device

100: Display panel

112: Substrate

200: touch sensing layer

BM: black matrix

BMa: first extension

BMb: second extension

DE1, DE2: Dummy electrodes

DE1a, DE1b, DE2a, DE2b: Dummy wire segments

OP: opening

SP1a, SP2a, SP1b, SP2b, SP1c, SP2c, SP1d, SP2d: Spacing

TE1, TE2: touch electrodes

TE1a, TE1b, TE2a, TE2b: Conductor segments

X, Y, X', Y', Z: direction

α1, α2, β1, β2: included angle

Claims (14)

A touch display device, comprising: a display panel; and a plurality of touch electrodes, which are arranged on the display panel overlappingly and have a plurality of wire segments intersecting with each other, any one of the wire segments arranged along a first direction A first distance SP1 between two adjacent ones satisfies the following relation:

, where PPI is the number of pixels per inch of the display panel, B is 1.8 or 2.1, and N is 1 or a positive even number, a second of any two adjacent ones of the wire segments arranged along a second direction The spacing SP2 satisfies the following relation:

, wherein the first direction intersects the second direction. The touch display device of claim 1, wherein the first spacing SP1 is equal to the second spacing SP2. The touch display device of claim 1, wherein the touch electrodes comprise: a plurality of first touch electrodes having a plurality of first wire segments and a plurality of second wire segments intersecting with each other; and a plurality of first touch electrodes Two touch electrodes, with a plurality of third wire segments and a plurality of fourth wire segments intersecting with each other, the first wire segments and the third wire segments are alternately arranged along the first direction with the first spacing SP1 , the second wire segments and the fourth wire segments are alternately arranged along a second direction with a second spacing SP2, the first direction intersects the second direction, wherein the second spacing SP2 satisfies the following relational expression :

The touch display device according to claim 1, wherein the display panel comprises a light-shielding structure layer, and the light-shielding structure layer has a plurality of first extending sections and a plurality of second extending sections intersecting with each other, and the touch electrodes have The included angle between the respective extending directions of the wire segments and the extending directions of the first extending segments or the extending directions of the second extending segments ranges from 25 degrees to 65 degrees. The touch display device of claim 1, wherein the line width of each of the wire segments is greater than 4 microns. The touch display device of claim 1, wherein the B/N is 2.10, 1.80, 1.05, 0.90, 0.525 or 0.45. The touch display device of claim 1, further comprising: a plurality of dummy electrodes disposed on the display panel overlappingly and electrically insulated from the touch electrodes, the dummy electrodes having a plurality of dummy wires intersecting with each other segment, and some of the dummy wire segments are arranged along the first direction with the first spacing SP1. A touch display device, comprising: a display panel suitable for a user to view at a viewing angle θ1 and a viewing distance D, the display panel comprising: a substrate having a first side and a second side opposite to each other; and a light-shielding structure layer disposed on the first side of the substrate; a plurality of touch electrodes disposed on the second side of the substrate and overlapping the light-shielding structure layer, and the touch electrodes have a plurality of intersecting electrodes a wire segment; and a protective layer disposed on the second side of the substrate and covering the touch electrodes and the substrate, a first one of any two adjacent ones of the wire segments arranged along a first direction A spacing SP1 satisfies the following relation:

where t is the thickness of the substrate, n1 is the refractive index of the protective layer, n2 is the refractive index of the substrate, PPI is the number of pixels per inch of the display panel, B is 1.8 or 2.1, and N is 1 or a positive even number , a second spacing SP2 of any two adjacent ones of the wire segments arranged along a second direction satisfies the following relation:

, wherein the first direction intersects the second direction. The touch display device of claim 8, wherein the first spacing SP1 is equal to the second spacing SP2. The touch display device of claim 8, wherein the touch electrodes comprise: a plurality of first touch electrodes having a plurality of first wire segments and a plurality of second wire segments intersecting with each other; and a plurality of first touch electrodes Two touch electrodes, with a plurality of third wire segments and a plurality of fourth wire segments intersecting with each other, the first wire segments and the third wire segments are alternately arranged along the first direction with the first spacing SP1 , the second wire segments and the fourth wire segments are alternately arranged along a second direction with a second spacing SP2, the first direction intersects the second direction, wherein the second spacing SP2 satisfies the following relational expression :

The touch display device of claim 8, wherein the light-shielding structure layer has a plurality of first extending sections and a plurality of second extending sections intersecting with each other, and the respective extending directions of the wire sections of the touch electrodes are the same as The included angle between the extending directions of the first extending segments or the extending directions of the second extending segments ranges from 25 degrees to 65 degrees. The touch display device of claim 8, wherein the line width of each of the wire segments is greater than 4 microns. The touch display device of claim 8, wherein the B/N is 2.10, 1.80, 1.05, 0.90, 0.525 or 0.45. The touch display device of claim 8, further comprising: a plurality of dummy electrodes disposed on the display panel overlappingly and electrically insulated from the touch electrodes, the dummy electrodes having a plurality of dummy wires intersecting with each other segment, and some of the dummy wire segments are arranged along the first direction with the first spacing SP1.

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