Capacitive touch screen

Abstract

The utility model relates to a capacitive touch screen which comprises an induction layer and a driving layer which are arranged in a stacked mode, the induction layer comprises an induction electrode, the driving layer comprises a driving electrode, the induction electrode adopts a strip-shaped pattern and comprises a plurality of parallel first channels, and the width of each first channel ranges from 0.55 mm to 0.65 mm. By increasing the width of the induction electrode channel, the uniformity of the original value of the touch screen is improved, and meanwhile it is avoided that the linearity of the touch screen is affected by excessively increasing the width of the induction electrode channel.

Description

Technical Field

[0001] The utility model relates to a capacitive touch screen. Background Art

[0002] Capacitive touch screens are divided into DITO structure touch screens and SITO structure touch screens according to their basic structures. The sensing electrodes and driving electrodes of the DITO structure touch screen are respectively located on two layers of ITO (indium tin oxide), while the sensing electrodes and driving electrodes of the SITO structure touch screen are located on the same layer of ITO.

[0003] The common structures of small and medium-sized DITO structure touch screens mainly include glass DITO structure, conventional film DITO structure, ultra-thin film DITO structure, etc., including a stacked sensing layer and a driving layer. The sensing layer mainly includes sensing electrodes and suspension blocks 4a, and the driving layer mainly includes driving electrodes. Touch screens of different structures often use different sensing and driving electrode patterns. Among them, glass DITO structure and conventional film DITO structure touch screens often use DITO double-strip patterns, see Figures 1A to 1D The sensing electrode includes a plurality of parallel first channels 1a and a bridge 3a for connecting the first channels 1a, and the driving electrode includes a plurality of parallel second channels 2a, and the second channels 2a are arranged perpendicular to the first channels 1a. The width w1 of the first channel 1a is generally 0.45 mm, and the width of the second channel 2a is adapted to the width w1 of the first channel 1a.

[0004] In the production process of capacitive touch screens, the touch screens need to be tested for raw value uniformity. A touch screen with good raw value uniformity has a more sensitive response to touches at different positions. In the raw value uniformity test of the product, the inventor of the utility model found that the yield rate of the above-mentioned small and medium-sized DITO structure touch screens using the DITO double-strip pattern is low. Utility Model Content

[0005] In order to solve the problem of low yield of the above touch screen, the inventor of the utility model studied the relationship between the channel width of the sensing electrode and the uniformity of the original value, and found that the uniformity of the original value of the touch screen can be improved by appropriately increasing the channel width of the sensing electrode.

[0006] The utility model provides a capacitive touch screen, which comprises a sensing layer and a driving layer which are stacked, wherein the sensing layer comprises sensing electrodes, and the driving layer comprises driving electrodes, wherein the sensing electrodes adopt a stripe pattern and comprise a plurality of parallel first channels, wherein the width of the first channels is between 0.55 mm and 0.65 mm.

[0007] In some embodiments of the present invention, the width of the first channel is 0.60 mm.

[0008] In some embodiments of the present invention, the sensing electrode further includes a bridge for connecting the first channel.

[0009] In some embodiments of the present invention, the capacitive touch screen further includes a cover plate, a glue layer and a glass substrate, and the cover plate, the glue layer, the sensing layer, the glass substrate and the driving layer are stacked in sequence.

[0010] In some embodiments of the present invention, the sensing layer further comprises a plurality of groups of suspension blocks, each group of suspension blocks comprises a plurality of suspension blocks, the plurality of groups of suspension blocks and the plurality of first channels are alternately arranged in sequence, and the spacing between each group of suspension blocks and adjacent first channels is no greater than 0.40 mm.

[0011] In some embodiments of the present invention, the driving electrode adopts a stripe pattern, including a plurality of parallel second channels, and the second channels are arranged perpendicular to the first channels.

[0012] In some embodiments of the present invention, the capacitive touch screen further includes a cover plate, a first glue layer and a second glue layer, and the cover plate, the first glue layer, the sensing layer, the second glue layer and the driving layer are stacked in sequence.

[0013] Through testing and verification, increasing the channel width of the sensing electrode can improve the uniformity of the original value of the touch screen. The utility model increases the channel width of the sensing electrode from the currently commonly used 0.45mm to 0.60mm, improving the uniformity of the original value of the touch screen while avoiding excessive increase in the channel width of the sensing electrode affecting the linearity of the touch screen. Considering the deviation caused by the difference in the actual situation of the touch screen, the most preferred channel width of the sensing electrode should be within the range of 0.60mm±0.05mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1A This is the structural diagram of the traditional DITO double-strip pattern; Figure 1B for Figure 1A A partial enlarged view of Figure 1C for Figure 1A A structural diagram of the driving electrode pattern shown; Figure 1D for Figure 1A The structure diagram of the sensing electrode pattern and the suspension block shown;

[0015] Figure 2A This is a structural diagram of a DITO double-strip pattern according to one embodiment of the present invention; Figure 2B for Figure 1A A partial enlarged view of Figure 2C for Figure 2A A structural diagram of the driving electrode pattern shown; Figure 2D for Figure 2AThe structure diagram of the sensing electrode pattern and the suspension block shown;

[0016] Figure 3A It is a local structural diagram of the sensing electrode pattern and the suspension block with a sensing electrode channel width of 0.30 mm; Figure 3B It is a partial structural diagram of the sensing electrode pattern and the suspension block with a sensing electrode channel width of 0.50 mm. DETAILED DESCRIPTION

[0017] The present invention will be described in detail below in conjunction with the accompanying drawings and one of the embodiments of the present invention.

[0018] One embodiment of the utility model provides a small-to-medium-sized glass DITO structure touch screen, which includes a cover plate, a glue layer, a sensing layer, a glass substrate and a driving layer stacked in sequence, and the sensing and driving electrode patterns adopt a DITO double-strip pattern, see Figures 2A to 2D The sensing layer includes sensing electrodes and multiple groups of suspension blocks 4b. The sensing electrodes adopt a stripe pattern, including multiple parallel first channels 1b and bridges 3b for connecting the first channels. The width w1 of the first channel is 0.60mm. Each group of suspension blocks 4b includes multiple regularly arranged suspension blocks 4b. The multiple groups of suspension blocks 4b and the multiple first channels 1b are alternately arranged in sequence. The spacing w2 between each group of suspension blocks 4b and the adjacent first channels 1b is 0.40mm. The suspension blocks 4b can effectively optimize the visual effect of the touch screen. See Figure 2C The driving electrode adopts a stripe pattern, including a plurality of parallel second channels 2b, the second channels 2b are arranged perpendicular to the first channels 1b, and the width of the second channels 2b matches the width w1 of the first channels 1b. In other embodiments of the utility model, the spacing w2 may also be less than 0.40mm or greater than 0.40mm, and when it is less than 0.40mm, the visual effect of the touch screen can be more effectively optimized; the width w1 of the first channel may also be less than 0.60mm or greater than 0.60mm, for example, between 0.55mm and 0.65mm.

[0019] The inventor of the utility model has conducted original value uniformity tests on touch screens with sensing electrode channel widths w1 of 0.30 mm, 0.45 mm, 0.50 mm and 0.60 mm, corresponding to Scheme 4, Scheme 1, Scheme 3 and Scheme 2 respectively. In Scheme 1, the touch screen sensing electrode channel width w1 is 0.45 mm, and the sensing electrode and suspension block structure refer to Figure 1D , the modulus is 1 to 3; in scheme 2, the touch screen sensing electrode channel width w1 is 0.60mm, and the sensing electrode and suspension block structure refer to Figure 2D , the module number is 4 to 6; in scheme 3, the touch screen sensing electrode channel width w1 is 0.50mm, and the sensing electrode and suspension block structure refer to Figure 3A, the module number is 7 to 9; in scheme 4, the touch screen sensing electrode channel width w1 is 0.30mm, and the sensing electrode and suspension block structure refer to Figure 3B , modulus is 10 to 12.

[0020] Modulus 1 to 12 are grouped together, and multiple groups of touch screens are manufactured, from which touch screens are randomly selected for testing, and the test data is shown in Table 1. According to the data in Table 1, appropriately increasing the channel width of the sensing electrode can reduce the resistance of the sensing electrode channel and improve the uniformity of the original value of the touch screen. In addition, since increasing the channel width of the sensing electrode too much will affect the linearity of the touch screen, thereby affecting the normal response of the touch screen to touch, the sensing electrode channel width w1 is preferably 0.60 mm.

[0021] It should be noted that the uniformity of the original value of the touch screen will be affected by the test environment, so in actual testing, the test results may be different from those in Table 1. In addition, when designing the DITO double-strip pattern, the channel width of the back driving electrode is adapted to the channel width of the front sensing electrode. When the channel width of the front sensing electrode is changed, the channel width of the back driving electrode is generally changed accordingly. However, compared with the impact of the change in the channel width of the sensing electrode on the uniformity of the original value of the touch screen, the impact of the change in the channel width of the back driving electrode can be ignored.

[0022] Table 1 Test data

[0023]

[0024] The utility model is not limited to the above-mentioned glass DITO structure touch screen, and is also applicable to conventional film DITO structure touch screens, which include a cover plate, a first adhesive layer, a sensing layer, a second adhesive layer, and a driving layer stacked in sequence, wherein the sensing layer mainly includes a sensing electrode, a suspension block, and a PET substrate, and the driving layer mainly includes a driving electrode and a PET substrate. As long as the above-mentioned DITO double-strip pattern is used, it belongs to the scope of the utility model.

Claims

1. A capacitive touch screen, comprising a sensing layer and a driving layer stacked together, wherein the sensing layer comprises sensing electrodes, and the driving layer comprises driving electrodes, wherein the sensing electrodes are in a stripe pattern and comprise a plurality of parallel first channels (1b), characterized in that: The width (w1) of the first channel (1b) is between 0.55 mm and 0.65 mm.

2. The capacitive touch screen according to claim 1, wherein: The width (w1) of the first channel (1b) is 0.60 mm.

3. The capacitive touch screen according to claim 1, wherein: The sensing electrode also includes a bridge (3b) for connecting the first channel (1b).

4. The capacitive touch screen according to any one of claims 1 to 3, characterized in that: The capacitive touch screen further comprises a cover plate, a glue layer and a glass substrate, wherein the cover plate, the glue layer, the sensing layer, the glass substrate and the driving layer are stacked in sequence.

5. The capacitive touch screen according to any one of claims 1 to 3, characterized in that: The sensing layer further comprises a plurality of groups of suspension blocks (4b), each group of suspension blocks (4b) comprising a plurality of suspension blocks (4b), the plurality of groups of suspension blocks (4b) and the plurality of first channels (1b) being arranged alternately in sequence, and a spacing (w2) between each group of suspension blocks (4b) and an adjacent first channel (1b) is no greater than 0.40 mm.

6. The capacitive touch screen according to any one of claims 1 to 3, characterized in that: The driving electrode adopts a stripe pattern and comprises a plurality of parallel second channels (2b), wherein the second channels (2b) are arranged perpendicular to the first channels (1b).

7. The capacitive touch screen according to any one of claims 1 to 3, characterized in that: The capacitive touch screen further comprises a cover plate, a first glue layer and a second glue layer, wherein the cover plate, the first glue layer, the sensing layer, the second glue layer and the driving layer are stacked in sequence.

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