A vehicle-mounted touch display device

Abstract

The present invention relates to an in-vehicle touch display device, which includes a capacitive touch screen and a display screen. The capacitive touch screen is arranged on the outer side of the display screen and is attached to each other. The capacitive touch screen includes a glass substrate and a touch control circuit layer arranged on its inner side. It is characterized in that: the capacitive touch screen further includes a light extinction layer, the light extinction layer is sandwiched between the touch control circuit layer and the glass substrate, and the light extinction layer is a black or dark light-absorbing film layer with an average light transmittance of less than 30%. This in-vehicle touch display device can not only greatly eliminate the reflected light of the touch control circuit layer, achieving a screen effect close to pure black, but also has a simple manufacturing process, greatly reducing the difficulty of manufacturing the capacitive touch screen.

Description

Technical Field

[0001] The present invention relates to a touch display component, and more particularly to an in-vehicle touch display device. Background Art

[0002] An in-vehicle touch display device is generally used as an instrument panel or a central control panel in an automobile, and generally includes a capacitive touch screen and a display screen that are attached to each other; the capacitive touch screen generally includes a transparent substrate (glass substrate) and a touch circuit layer provided on its inner side.

[0003] When an automobile is used in an outdoor environment, it is often exposed to strong ambient light. Since the touch circuit layer generally includes a large number of touch sensing electrodes, and the touch sensing electrodes are generally made of a transparent conductive oxide film such as ITO, which has a high refractive index. Therefore, the touch circuit layer often generates strong reflected light under the irradiation of ambient light, and these reflected lights will interfere with the normal driving of the driver and pose certain safety hazards.

[0004] Currently, a method of providing multiple anti-reflection film layers on the outer side of the touch circuit layer is generally used to reduce its reflected light. This method requires covering multiple anti-reflection films with different refractive indices and thicknesses on the transparent conductive oxide film, and its manufacturing process is very complex and difficult to control, which will greatly increase the manufacturing difficulty of the capacitive touch screen. In addition, the existing anti-reflection film layer cannot completely eliminate the reflected light and will cause color deviation of the screen, and it is impossible to achieve the best effect of pure black. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an in-vehicle touch display device that can not only greatly eliminate the reflected light of the touch circuit layer and achieve a screen effect close to pure black, but also has a simple manufacturing process and can greatly reduce the manufacturing difficulty of the capacitive touch screen. The technical solution adopted is as follows:

[0006] An in-vehicle touch display device includes a capacitive touch screen and a display screen. The capacitive touch screen is disposed outside the display screen and attached to each other. The capacitive touch screen includes a glass substrate and a touch circuit layer provided on its inner side. The feature is that: the capacitive touch screen further includes a light extinction layer, the light extinction layer is sandwiched between the touch circuit layer and the glass substrate, and the light extinction layer is a black or dark color light absorption film layer with an average light transmittance of less than 30%.

[0007] The above capacitive touch screen and the display screen can be fixed to each other by means of frame pasting (i.e., only pasting around the perimeter) (there is generally an air layer between the capacitive touch screen and the display screen), or can be fixed to each other by means of full lamination (there is generally a transparent adhesive layer between the capacitive touch screen and the display screen).

[0008] The touch circuit layer generally includes a plurality of sensing electrodes and connection circuits thereof arranged in the display area. The sensing electrodes are generally formed by patterning (e.g., photolithography) a transparent conductive film layer (e.g., indium tin oxide (ITO), aluminum zinc oxide (AZO), indium gallium zinc oxide (IGZO)); the connection circuits generally include jumpers, peripheral circuits, or external terminals for connecting the sensing electrodes, which can generally be formed by patterning a metal film (e.g., a molybdenum-niobium-aluminum-niobium-molybdenum-niobium three-layer alloy (molybdenum-aluminum-molybdenum)) and the above-mentioned transparent conductive film.

[0009] The above-mentioned matte layer and touch circuit layer constitute the display area of ​​the vehicle-mounted touch display device. When ambient light irradiates the display area of ​​the vehicle-mounted touch display device, the ambient light passes through the glass substrate and the matte layer, is reflected on the film layer of the touch circuit layer, and then passes through the matte layer and the glass substrate in sequence. The ambient light is significantly weakened (at least 90% weakened) by passing through the matte layer twice, and the reflected light of the touch circuit layer is greatly eliminated, achieving a screen effect close to pure black; because in this touch display device, the touch circuit layer of the capacitive touch screen can achieve low reflection without the need for a complex anti-reflection design, its manufacturing process is simpler, and there will be no difficult-to-eliminate reflected light color, which can greatly reduce the difficulty of manufacturing the capacitive touch screen.

[0010] Since the touch circuit layer is made on the matte layer, in order to ensure the flatness of the matte layer (and thus ensure the accuracy of the pattern of the touch circuit layer), in the preferred solution, the matte layer is a black or dark photosensitive resin coating. The photosensitive resin coating is coated into a film by extrusion coating, and then further irradiated with ultraviolet light for curing.

[0011] In a more preferred embodiment, the black or dark photosensitive resin coating is formed by coating a negative photosensitive resin mixed with carbon particles or a dark dye.

[0012] In a more preferred embodiment, the thickness of the above-mentioned matte layer is 0.5μm to 4μm.

[0013] Considering that the matte layer will also reduce the light transmittance of the capacitive touch screen, in a preferred embodiment, the display screen is a flat panel display, and its maximum screen brightness is greater than 1000 nit, so as to ensure that the display image still has sufficient brightness after passing through the capacitive touch screen.

[0014] The above display screen can adopt a display device that directly uses light-emitting diodes (LEDs) as pixels (or sub-pixels). The pixels of this display device are directly composed of LEDs, and its brightness is extremely high, making it easier for the display screen to reach a high brightness above 1000 nits. In a more preferred embodiment, the above display screen is a microLED or miniLED display, in which an LED arrangement area is defined within the pixel area, and the area ratio of the LED arrangement area to the pixel area is ≤ 50%. The LEDs of the microLED or miniLED display are arranged within the LED arrangement area. Several LEDs, especially LEDs of different colors, can be arranged in the LED arrangement area of each pixel to form a color display.

[0015] In a further more preferred embodiment, the above extinction layer includes a first extinction layer and a second extinction layer. The first extinction layer covers the inner side surface of the glass substrate, and the light transmittance of the first extinction layer is less than 60%; the second extinction layer covers the inner side surface of the first extinction layer, the light transmittance of the second extinction layer is less than 5%, and the second extinction layer is provided with a plurality of light-transmitting holes, and the positions of the light-transmitting holes correspond to the LED arrangement area. Each of the above light-transmitting holes is a hollow hole formed by patterning the second extinction layer. The light emitted by each LED mainly emits through the corresponding light-transmitting hole. In the light-transmitting hole, the light emitted by the LED is only absorbed by the first extinction layer. The light transmittance of the first extinction layer is relatively high, so the display brightness can be improved; since the influence of the second extinction layer on the light emission of the LED is very small, the second extinction layer can adopt a design with a lower light transmittance (even completely opaque) to eliminate the reflection of the touch circuit layer in the non-LED arrangement area; this design can not only improve the display brightness but also effectively reduce the reflection of the touch circuit layer.

[0016] In a further more preferred embodiment, the cross-sectional area of the above light-transmitting hole is 0.8 to 1.4 times that of the LED arrangement area. Specifically, the cross-sectional area of the light-transmitting hole can be controlled so that the average light transmittance of the extinction layer is less than 30%.

[0017] When the above capacitive touch screen and the display screen are fixed to each other by frame pasting (i.e., only pasted around the perimeter) (an air layer is generally sandwiched between the touch screen and the display screen), in order to improve the angle of light emission of the LED light from the light-transmitting hole (and the mixing of colors), in a further more preferred embodiment, a scattering layer is provided on the inner side of the above light-transmitting hole, and the scattering layer is a white or gray ink layer or a photosensitive resin coating. The scattering layer is formed by printing or exposure and development to form a graphic block covering the inner side of the above light-transmitting hole.

[0018] In order to improve the display brightness or reduce the area of the light-transmitting hole, in a further more preferred embodiment, a microlens is provided between the above scattering layer and the LED arrangement area. The microlens can converge the light emitted by the corresponding LED to the corresponding scattering layer, thereby improving the display brightness; or reduce the area of the light-transmitting hole and further reduce the reflection.

[0019] The in-vehicle touch display device of the present invention is provided with an extinction layer between the touch circuit layer and the glass substrate. The extinction layer is a black or dark light-absorbing film layer with an average light transmittance of less than 30%. When ambient light irradiates the display area of the in-vehicle touch display device, it can greatly eliminate the reflected light of the touch circuit layer, achieving a screen effect close to pure black. Moreover, in such a touch display device, the touch circuit layer of the capacitive touch screen can achieve low reflection without adopting a complex anti-reflection design, with a simple manufacturing process and no difficult-to-eliminate reflected light color, which can greatly reduce the manufacturing difficulty of the capacitive touch screen. Description of the Drawings

[0020] Figure 1 It is a schematic structural diagram of the first embodiment of the preferred embodiment of the present invention.

[0021] Figure 2 It is a schematic structural diagram of the second embodiment of the preferred embodiment of the present invention.

[0022] Figure 3 is Figure 2 top view of

[0023] Figure 4 It is a size table of pixels, LED arrangement areas, LEDs, and light-transmitting holes in the case where the average light transmittance of the extinction layer in the second embodiment is 8%.

[0024] Figure 5 It is a schematic structural diagram of the third embodiment of the preferred embodiment of the present invention. Detailed Embodiment

[0025] Embodiment 1

[0026] As Figure 1 shown, such an in-vehicle touch display device includes a capacitive touch screen 1 and a display screen 2. The capacitive touch screen 1 is disposed outside the display screen 2 and is attached to each other. The capacitive touch screen 1 includes a glass substrate 11, a touch circuit layer 12 disposed on its inner side, and an extinction layer 13. The extinction layer 13 is sandwiched between the touch circuit layer 12 and the glass substrate 11, and the extinction layer 13 is a black or dark light-absorbing film layer with an average light transmittance of less than 30%.

[0027] In this embodiment, the extinction layer 13 is a black or dark photosensitive resin coating, which is formed by coating a negative photosensitive resin mixed with carbon particles or dark dyes. The photosensitive resin coating is coated into a film by an extrusion coating method and then further cured by irradiating ultraviolet light.

[0028] In this embodiment, the thickness of the extinction layer 13 is 0.5 μm to 4 μm.

[0029] In this embodiment, the display screen 2 is a flat panel display 21, and its maximum screen brightness is greater than 1000 nits, so as to ensure that its displayed image still has sufficient brightness after passing through the capacitive touch screen 1 for presentation.

[0030] The touch control circuit layer 12 and the light extinction layer 13 form the display area of the in-vehicle touch control display device. When ambient light irradiates the display area of the in-vehicle touch control display device, after the ambient light passes through the glass substrate 11 and the light extinction layer 13 and is reflected on the film layer of the touch control circuit layer 12, it then passes through the light extinction layer 13 and the glass substrate 11 in sequence and comes out. It passes through the light extinction layer 13 twice successively and is significantly weakened (at least weakened by 90%), greatly eliminating the reflected light of the touch control circuit layer 12 and achieving a screen effect close to pure black.

[0031] Embodiment 2

[0032] Reference Figure 2 、 Figure 3 In other parts that are the same as Embodiment 1, the difference is that: in this embodiment, the display screen 2 is a microLED or miniLED display, its maximum screen brightness is greater than 1000 nits, an LED arrangement area 22 is defined within the pixel area 21, the area ratio of the LED arrangement area 22 to the pixel area 21 is ≤ 50%, and the LEDs 221 of the microLED or miniLED display are arranged within the LED arrangement area 22.

[0033] In this embodiment, the light extinction layer 13' includes a first light extinction layer 131' and a second light extinction layer 132'. The first light extinction layer 131' covers the inner side surface of the glass substrate 11, and the light transmittance of the first light extinction layer 131' is less than 60%; the second light extinction layer 132' covers the inner side surface of the first light extinction layer 131', and the light transmittance of the second light extinction layer 132' is less than 5%; the second light extinction layer 132' is provided with a plurality of light transmission holes 1321, the positions of the light transmission holes 1321 correspond to those of the LED arrangement area 22, and the cross-sectional area of the light transmission holes 1321 is 0.8 to 1.4 times that of the LED arrangement area 22. Specifically, the cross-sectional area of the light transmission holes 1321 can be controlled so that the average light transmittance of the light extinction layer 13' is less than 30% (see Figure 4 for the specific solution, the light transmittance of the first light extinction layer 131' is 40%, the light transmittance of the second light extinction layer 132' ≈ 0, the final area ratio of the LED arrangement area 22 to the pixel is 12%, and the average light transmittance of the light extinction layer 13' is 8%).

[0034] Each light-transmitting hole 1321 is a hollow hole formed by patterning the second light extinction layer 132'. The light emitted by each LED 221 mainly passes through the corresponding light-transmitting hole 1321. In the light-transmitting hole 1321, the light emitted by the LED 221 is only absorbed by the first light extinction layer 131'. The light transmittance of the first light extinction layer 131' is relatively high, so the display brightness can be improved. Since the influence of the second light extinction layer 132' on the light emission of the LED 221 is very small, the second light extinction layer 132' can be designed with a lower light transmittance (even completely opaque) to eliminate the reflection of the touch circuit layer 12 in the non-LED arrangement area 22. This design can not only improve the display brightness but also effectively reduce the reflection of the touch circuit layer 12.

[0035] Embodiment 3

[0036] Reference Figure 5 , under the condition that other parts are the same as those in Embodiment 2, the difference lies in that: in this embodiment, the capacitive touch screen 1 and the display screen 2 can be fixedly connected to each other by frame pasting (that is, only pasting around a circle) (generally, an air layer is sandwiched between the capacitive touch screen 1 and the display screen 2); a scattering layer 31 is provided inside the light-transmitting hole 1321, and the scattering layer 31 is a white or gray ink layer or a photosensitive resin coating; a transparent isolation layer 32 is provided on the outer side surface of the display screen 2, a SiO2 thin film 33 is provided on the outer side surface of the transparent isolation layer 32, and a microlens 34 is provided on the outer side surface of the SiO2 thin film 33 (formation of the microlens 34: coating a photosensitive resin coating, patterning into dots, and heating and melting to form a lens shape), and the microlens 34 is located between the scattering layer 31 and the LED arrangement area 22.

[0037] The scattering layer 31 is formed by printing or exposure and development to form a graphic block covering the inside of the light-transmitting hole 1321; the lens layer 34 can converge the light emitted by the corresponding LED 221 to the corresponding scattering layer 31, thereby improving the display brightness; or reducing the area of the light-transmitting hole 1321 to further reduce reflection.

[0038] In addition, it should be noted that for the specific embodiments described in this specification, the names of their respective parts and the like can be different. Any equivalent or simple changes made according to the structure, features, and principles described in the inventive concept of this invention patent are included in the protection scope of this invention patent. Those skilled in the technical field to which this invention belongs can make various modifications, supplements, or use similar methods to replace the specific embodiments described as long as they do not deviate from the structure of this invention or exceed the scope defined by this patent claim book, and they should all belong to the protection scope of this invention.

Claims

1. A vehicle-mounted touch display device, comprising a capacitive touch screen and a display screen. The capacitive touch screen is arranged outside the display screen and is attached to each other. The capacitive touch screen includes a glass substrate and a touch circuit layer provided on its inner side. It is characterized in that: The display screen is a MicroLED or MiniLED display, its maximum screen brightness is greater than 1000 nit, an LED arrangement area is defined in its pixel area, and the area ratio of the LED arrangement area to the pixel area is ≤ 50%. The LEDs of the display are arranged in the LED arrangement area; the capacitive touch screen further includes a light extinction layer, and the light extinction layer is sandwiched between the touch circuit layer and the glass substrate. The light extinction layer is a dark light-absorbing film layer with an average light transmittance of less than 30%. The light extinction layer includes a first light extinction layer and a second light extinction layer. The first light extinction layer covers the inner side surface of the glass substrate, and the light transmittance of the first light extinction layer is less than 60%. The second light extinction layer covers the inner side surface of the first light extinction layer, and the light transmittance of the second light extinction layer is less than 5%. The second light extinction layer is provided with a plurality of light-transmitting holes, and the positions of the light-transmitting holes correspond to the LED arrangement area. A scattering layer is provided inside the light-transmitting holes. The scattering layer is an ink layer or a photosensitive resin coating, and the scattering layer is formed into a graphic block covering the inside of the light-transmitting holes by printing or exposure and development; a microlens is provided between the scattering layer and the LED arrangement area.

2. A vehicle-mounted touch display device according to claim 1, It is characterized in that: The light extinction layer is a dark photosensitive resin coating.

3. A vehicle-mounted touch display device according to claim 2, It is characterized in that: The dark photosensitive resin coating is formed by coating a negative photosensitive resin mixed with carbon particles or a dark dye.

4. A vehicle-mounted touch display device according to claim 2 or 3, It is characterized in that: The thickness of the light extinction layer is 0.5 μm - 4 μm.

5. A vehicle-mounted touch display device according to any one of claims 1 - 3, It is characterized in that: The cross-sectional area of the light-transmitting hole is 0.8 - 1.4 times that of the LED arrangement area.

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