TWI783757B - Touch pad with instruction light - Google Patents

Abstract

A touch pad with instruction light is disclosed. The touch pad with instruction light includes a rigid touch circuit board, a front light module, an adhesive layer and a protection cover. The front light module is arranged on the rigid touch circuit board, and includes: a reflective material; a first light guide sheet superimposed on the reflective material; a light transmitting adhesive layer on the first light guide sheet; a second light guide sheet superimposed on the light transmitting adhesive layer; a first light source and a second light source that alternatively provide light to the first light guide sheet and a the second light guide sheet through a first light incident side and a second light incident side; and a first light absorbing member to prevent light from the second light source to entering the first light guide sheet and a second light absorbing member to prevent light from the first light source to entering the second light guide sheet; and the protection cover is arranged on the second light guide sheet via the optical adhesive layer. Therefore, the first light guide sheet and the second light guide sheet are kept level on the rigid touch circuit board , and in response to different light sources, the first dot pattern of the first light guide sheet or the second dot pattern of the second light guide sheet are triggered to be visible respectively.

Description

touch display device

The present invention is related to a touch panel, in particular to a touch display device.

The touchpad is an input device widely used in notebook computers. It senses the movement of the user's fingers to control the movement of the cursor, and can be regarded as a substitute for the mouse. With the progress of the times, the input device on the notebook computer has more and more stringent requirements on specifications and aesthetics. Taking the luminous keyboard as an example, the specification of the luminous module requires lightness, thinness, and power saving. The aesthetic requirement is that the luminous uniformity of each key character must reach a certain level, so that its defects cannot be seen by the naked eye. Therefore, the existing touch panel, even the touch panel with the basic number key guiding function, has deficiencies in thinning, aesthetic appearance and functional diversification.

In view of this, based on years of rich experience in related industries, the inventor conceived and proposed a touch display device to provide a touch panel with thinner and multiple guidance keys.

One object of the present invention is to provide a touch display device, which can effectively reduce the thickness of the overall device, and can display different images that can be touched by switching the light source, and the performance of the images is clearer. It is bright, and thus meets the product requirements of thinness, multi-function and excellent display performance required by the market.

In order to achieve the above purpose, the present invention proposes a touch display device in one embodiment, comprising: a rigid touch circuit substrate, which is an inflexible board body; a front light module, arranged on the rigid touch circuit board On the circuit substrate, it includes: a reflective material disposed on the upper surface of the rigid touch circuit substrate; a first light guide sheet stacked on the reflective material and having a first light-incident side, the first light guide A first dot pattern is provided on the upper or lower surface of the light sheet; a light-transmitting adhesive layer is coated on the upper surface of the first light-guiding sheet; a second light-guiding sheet is stacked on the light-transmitting adhesive layer, And has a second light-incident side, a second dot pattern is provided on the upper or lower surface of the second light-guiding sheet; a first light source is used to provide light to the first light-guiding sheet through the first light-incident side ; A second light source, used to provide light to the second light guide sheet through the second light incident side; wherein, the first light source and the second light source are respectively arranged on both sides of the front light module; The first light-absorbing member is used to block the light from the second light source from entering the first light-guiding sheet; and a second light-absorbing member is used to block the light from the first light source from entering the second light-guiding sheet; an optical adhesive layer , coated on the upper surface of the second light guide sheet; and a protective cover, covered on the optical adhesive layer; thereby, the first light guide sheet and the second light guide sheet pass through the rigid touch The structure of the circuit board is rigid to maintain the levelness of the main body, and when the first light source is activated, the first dot pattern is displayed, and when the second light source is activated, the second dot pattern is displayed. Through the above structural features, the touch display module can effectively maintain its light guiding performance even though the thickness of the light guide sheet is greatly reduced, and by switching between the first light source and the second light source, different displays can be displayed. The pattern has dual display function, which has better functionality in application, and the dot pattern can maintain excellent light emission and display performance through the setting of light-absorbing materials.

In another embodiment, the first light-absorbing element is attached to the reflective material, and the second light-absorbing element is attached to the optical adhesive layer, so as to at least facilitate assembly and block the light to be shielded respectively.

In order to increase the amount of incident light on the first light guide sheet and the second light guide sheet, in yet another embodiment, it is disclosed that the first light incident side and the second light incident side are bell mouth structures with platforms respectively, and the First The light-absorbing element is at least attached to the platform area of the second light-incident side, and the second light-absorbing element is at least attached to the platform area of the first light-incident side.

Based on the above-mentioned embodiment, further, the thickness of the first light-absorbing member and the second light-absorbing member is 0.025-0.075 mm, so as to achieve the light-shielding effect under the thinning configuration.

In another embodiment, it is disclosed that the platform on the first light incident side is provided with a first through hole for accommodating the first light source, and the platform on the second light incident side is provided with a second through hole , for accommodating the second light source, so as to improve light utilization rate, and facilitate assembly and positioning to improve yield.

In yet another embodiment, it is disclosed that the first and second light guide sheets and the first and second light absorbing members are oppositely arranged. In this state, the first light guide sheet has a One of the light sides is a first high beam side, and the first light absorbing member is arranged corresponding to the first high beam side; the second light guide sheet further has a second high beam side opposite to the second light incident side, and the The second light absorbing member is disposed corresponding to the second high beam side.

In the foregoing embodiments, the thicknesses of the first light-absorbing member and the second light-absorbing member are also 0.025-0.075 mm, so as to achieve the light-shielding effect under the thinning configuration.

Based on the demand for thinner products, in one embodiment, the thickness of the first light guide sheet and the second light guide sheet can be 0.15 mm.

In addition, in yet another embodiment, the first light-absorbing member and the second light-absorbing member are made of water glue mixed with black ink particle material, and the light-transmitting adhesive layer is made of water-gel material, so as to have better light-absorbing effect and light-transmitting effect respectively. light effect.

In an application state, in an embodiment, it is disclosed that the first dot pattern includes a plurality of functional symbols and is located on the lower surface of the first light guide sheet, and the second dot pattern at least includes a plurality of numeral symbols and is located on the second The lower surface of the light guide sheet to improve the clarity of the dot pattern.

To sum up, the touch display device of the present invention has guiding functions of at least two different dot patterns through at least two light guide sheets. At the same time, the touch display device includes an inflexible rigid touch circuit substrate, so that the thickness of the first and second light guide sheets can still achieve the expected optical adjustment and light output effect after being reduced, thereby meeting the requirements of thinning the display device. market demand. In addition, due to the structural characteristics of the touch display device, the displayed pattern can also have a clear and bright display effect, which really provides a thin and high-performance multiple image display product, especially suitable for use as a notebook Computer touchpad.

1: Touch display device

10: Rigid touch circuit substrate

11: Front light module

111: reflective material

112: The first light guide sheet

1121: the first incident light side

1122: The first dot pattern

1123: function symbol

1124: The first high beam side

1125: The first through hole

113: light-transmitting adhesive layer

114: The second light guide sheet

1141: the second incident light side

1142: Second dot pattern

1143: number symbol

1144: Second high beam side

1145: Second through hole

115: The first light source

116: Second light source

117: The first light-absorbing member

118: Second light absorbing member

12: Optical adhesive layer

13: Protective cover

FIG. 1 is an exploded schematic view of a touch display device according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of a stacked structure of a touch display device according to an embodiment of the present invention.

FIG. 3 is a schematic diagram of an application state of a touch display device according to an embodiment of the present invention.

FIG. 4 is a schematic diagram of a stacked structure of a touch display device according to another embodiment of the present invention.

Fig. 5 is a schematic diagram of a stacked structure of a touch display device according to a second embodiment of the present invention.

In view of the need for both effective light extraction and thinning, the inventor proposed a touch display device to solve the adverse effects of excessive thickness of the light guide plate on thinning and improve the image display effect. Drive different light sources to transform and display different images. The following is a description of the detailed technical features of the touch display device of the present invention through text combined with drawings; wherein, the figures shown are only for illustrative purposes of illustrating the technical features of the present invention, and do not represent the actual length, width, and height. Or the ratio of ruler and gauge such as thickness, please describe first.

Please refer to Figures 1 and 2 together, which are exploded schematic diagrams of a touch display device according to an embodiment of the present invention. The touch display device 1 of the present invention includes a rigid touch circuit substrate 10 , a front light module 11 , an optical adhesive layer 12 and a protective cover 13 . The rigid touch circuit substrate 10 is an inflexible board on which electrical components such as circuits related to touch driving are arranged. The front light module 11 is set on the rigid touch circuit substrate 10, including a reflective material 111, a first light guide sheet 112, a light-transmitting adhesive layer 113, a second light guide sheet 114, a first light source 115, A second light source 116 , a first light absorbing element 117 and a second light absorbing element 118 .

The reflective material 111 is arranged on the upper surface of the rigid touch circuit substrate 10, wherein the reflective material 111 can be a thin film laminated on the rigid touch circuit substrate 10, or can be printed with reflective ink on the rigid touch circuit substrate 10. formed on the upper surface. The first light guide sheet 112 is stacked on the reflective material 111 and has a first light incident side 1121 , and a first dot pattern 1122 is disposed on the top or bottom surface of the first light guide sheet 112 . The light-transmitting adhesive layer 113 is usually optical clear adhesive (OCA, Optical Clear Adhesive) coated on the upper surface of the first light guide sheet 112 to achieve the effect of adhesion and fixation. The second light guide sheet 114 is stacked on the light-transmitting adhesive layer 113 and has a second light-incident side 1141 , and a second dot pattern 1142 is disposed on the upper or lower surface of the second light guide sheet 1141 . It is also added that, generally speaking, light guide elements in the industry can be divided into light guide plates and light guide sheets according to the difference in thickness. If the light guide plate is not specifically defined, in principle, its thickness is one level higher than that of the light guide sheet. The number, for example, is 2, 3 mm, and the first light guide sheet 112 and the second light guide sheet 114 of the present invention are light guide sheet grades, and the thickness is about a few tenths of mm. More specifically, in one embodiment Among them, the first light guide sheet 112 and the second light guide sheet 114 of the front light module 11 are selected to have a thickness of less than 0.3mm.

The first light source 115 is used to provide light to the first light guide sheet 112 through the first light incident side 1121, and the second light source 116 is used to provide light to the second light guide sheet 114 through the second light incident side 1141, wherein the first The light source 115 and the second light source 116 are respectively disposed on two sides of the front light module 11, which may be opposite or adjacent sides, which will be described later. The first light absorbing member 117 is used to block the light from the second light source 116 from entering the first light guide sheet 112, the second light-absorbing member 118 is used to block the light from the first light source 115 from entering the second light guide sheet 114, so as to prevent the light from entering the second light guide sheet 114 when the first light source 115 works, and prevent the first light source 115 from entering the second light guide sheet 114. When the two light sources 116 function, their light rays are incident on the first light guide sheet 112 together, causing the patterns that should not be displayed to be lighted and displayed at the same time, and have an excellent concealing effect; in the figure, for easy understanding, the opposite sides are shown case. The optical adhesive layer 12 is coated on the upper surface of the second light guide sheet 114 , and the protective cover 13 is covered on the optical adhesive layer 12 .

In this way, the first light guide sheet 112 and the second light guide sheet 114 maintain the levelness of the body through the structural stiffness of the rigid touch circuit substrate 10, and when the first light source 115 is activated, the first dots are displayed The pattern 1122 displays a second dot pattern 1142 when the second light source 116 is activated. In other words, the general touch circuit board is either a capacitive or inductive touch film, which is laid on a circuit board (PCB) or a flexible circuit board (FPC), and equipped with a light guide element with a certain thickness, which is difficult to achieve. Thinning requirements. If the light guide element is selected as a thinner sheet structure, the flexible plate used to carry the light guide element will cause the light guide element to not have sufficient horizontal support force, so that the main body will lose weight during the pressing operation. Local bending and bending phenomenon occurs. At this time, when the light provided by the first light source 115 or the second light source 116 reaches the depressions of the first light guide sheet 112 and the second light guide sheet 114, abnormal The expected light output greatly affects the light output effect and image display status. Therefore, the present invention specially selects the rigid touch circuit substrate 10 with inflexibility to carry the first light guide sheet 112 and the second light guide sheet 114, so as to provide the first light guide sheet 112 through the rigid touch circuit substrate 10 The sufficient horizontal supporting force of the second light guide sheet 114 allows the first light guide sheet 112 and the second light guide sheet 114 to operate effectively without being dented, bent, or bent while being thinned.

In terms of display performance, the touch display device 1 of the present invention controls different light sources to irradiate the corresponding light guide sheet to display the desired pattern, that is, after the first light source 115 acts, the first entry of the first light guide sheet 112 The light side 1121 receives light, and the position of the first dot pattern 1122 can emit light to display the corresponding pattern. After the second light source 116 acts, the second light incident side 1141 of the second light guide sheet 114 receives light, and the second The position of the dot pattern 1142 can emit light to display the corresponding pattern, in this way the purpose of switching between different display patterns is achieved, and it has the function of dual display screens. In other words, taking the rectangular touch display device 1 as an example, this case can also be designed as a stack of four light guide sheets with different preset dot patterns, which are lit by four sets of light strips, and each is equipped with a blocking non- The four sets of light-absorbing parts that are expected to enter the light can integrate the function keys of four preset guide patterns into a light module in front of a touch panel, which is both thin and functional.

In the application scenario of a notebook computer, the touch display device 1 can be extended to a position equal to the length of the keyboard, that is, the entire plane above the host, except for the keyboard; It can even replace the keyboard to become an integrated input interface. At this time, the aforementioned stacked structure of four light guide sheets has potential. For example, when the user taps the original position of the keyboard, the third light source and the third light guide sheet are driven to provide luminous characters, and the rigid touch circuit substrate 10 provides the user with the function of typing; When the left or right side of the traditional touchpad is clicked, the fourth light source and the fourth light guide sheet are driven to provide guidance on the luminous outer frame of the operating area to guide the user's next operation and make them fall on the desired position. The rigid touch circuit substrate 10 corresponding to the range of the light-emitting outer frame. In this way, in addition to the number keys and function keys, the preset dot pattern can also be a flat touch ball, or even keyboard characters used for typing in various countries.

In practice, the first light source 115 and the second light source 116 can be LED light strips, or a plurality of LEDs arranged at intervals, and are directly arranged on the rigid touch circuit substrate 10 in an SMT manner; in an implementation state, the second A light source 115 and a second light source 116 are arranged on opposite sides of the front light module 11. Of course, the direction in which the first light source 115 and the second light source 116 are arranged is not limited to this, and they can also be adjacent to each other as mentioned above. And it is located on both sides of the front light module 11 . Wherein, when the reflective material 111 is a piece, in an implementation state, the reflective material 111 can be provided with openings to allow the first light source 115 and the second light source 116 to pass through; if the reflective material 111 is realized by coating, then It can also be integrated into the above-mentioned SMT process of the LED.

Furthermore, since the light guide sheet selected in this case is based on thinner considerations, in terms of overall design planning, considering the light incident efficiency, the first light source 115 and the second light source 116 can also use Mini LEDs in the form of flip chips Positioning on the rigid touch circuit substrate 10 through SMT, it is only necessary to design a supporting side light incident solution at this time, for example, add a reflector on the top of the Mini LED, and the direct light source can be converted into a side light solution. , into the aforementioned light guide sheet.

Continuing to describe the structures in FIGS. 1 and 2 , the first light-incident side 1121 and the second light-incident side 1141 correspond to the first light source 115 and the second light source 116 respectively, so as to receive incident light. And in this setting state, the first light-absorbing member 117 can be arranged on the opposite side corresponding to the first light-incident side 1121, and the second light-absorbing member 118 can be arranged on the opposite side corresponding to the second light-incident side 1141. 1 and 2, to have a more accurate light blocking effect. The first dot pattern 1122 and the second dot pattern 1142 are patterns formed by the arrangement of optical dots, so that light enters the first light guide sheet 112 and the second light guide sheet 114 to form light according to these optical dots, and Create corresponding patterns. Among them, in order to highlight the outline of the pattern, a blank area can be set on the periphery of the optical dots constituting the pattern, so as to enhance the contrast between light and dark when the light is emitted, so that the outline of the pattern is more obvious. Previously applied for and approved patent technologies are not listed here.

Further, in order to facilitate the installation of the first light-absorbing member 117 and the second light-absorbing member 118, in one embodiment, the first light-absorbing member 117 can be attached to the reflective material 111, and the second light-absorbing member 118 can be attached to the optical adhesive layer 12, as shown in Figures 1 and 2. Thereby, in terms of arranging the first light-absorbing member 117 and the second light-absorbing member 118 , it can have better stability and convenience, and there is no need to rely on external components for positioning or alignment. For example, the first light-absorbing member 117 can be quickly installed on the reflective material 111 by brushing, and the second light-absorbing member 118 can also be painted on the optical adhesive layer 12 synchronously during manufacture, so that the assembly process can be more convenient And save time.

In addition, in practical application, in one embodiment, the thickness of the first light guide sheet 112 and the second light guide sheet 114 is 0.15 mm, so as to have a better thinning effect. And to reiterate here, because the touch display device 1 of the present invention includes an inflexible rigid touch circuit substrate 10 to provide the supporting force of the first light guide sheet 112 and the second light guide sheet 114, so that its body can be used in the application Therefore, the first light guide sheet 112 and the second light guide sheet 114 can be used to be as thin as 0.15 mm.

Considering the efficiency of blocking light and the convenience of manufacture or assembly, etc., the first light-absorbing member 117 and the second light-absorbing member 118 can be made of water glue mixed with black ink particles, and the light-transmitting adhesive layer 113 can be made of water glue. The water glue material is a kind of optical glue, generally called OCR, which is used to make the components fit and fix each other. Since light must be allowed to pass between the protective cover 13 and the second light guide sheet 114, the light-transmitting adhesion The layer 113 can meet the needs of fixation and light transmission by using water glue, but it is certainly not limited thereto. The first light-absorbing member 117 and the second light-absorbing member 118 need to effectively block light, so black ink particles can be mixed in the water glue to absorb and block light through the black ink, and thus can be quickly installed by painting.

The touch display device 1 of the present invention can be applied in various fields, for example, as a control panel of general household appliances such as washing machines and water heaters, or as a central control panel of an electric vehicle, and in an implementation state, the first network point The pattern 1122 includes a plurality of functional symbols 1123 and is located on the lower surface of the first light guide sheet 112, and the second dot pattern 1142 includes at least a plurality of numerical symbols 1143 and is located on the lower surface of the second light guide sheet 114, as shown in FIG. 1 Show. Wherein the first dot pattern 1122 and the second dot pattern 1142 are located on the lower surface of the first light guide sheet 112 and the second light guide sheet 114 respectively, which can further improve the efficiency of light use and the uniformity of light output, and optimize the quality of light output Effect. Please also refer to FIG. 3 , which is a schematic diagram of the application state of the touch display device according to an embodiment of the present invention. In the above embodiment, after the first light source 115 acts to allow light to enter the first light guide sheet 112, the light is formed in response to the first dot pattern 1122 to emit light, displaying a plurality of function symbols 1123, such as volume adjustment symbols, brightness adjustment Symbols, etc., the user can perform corresponding control by touching each function symbol. When the second light source 116 acts to allow light to enter the second light guide sheet 114, the light is formed in response to the second dot pattern 1142 to emit light, and then a plurality of numerical symbols 1143 are displayed. Depending on the actual application, in addition to the numerical symbols 1143, further The second dot pattern 1142 includes, for example, input, delete, operation symbols, and grid lines. (a) in Figure 3 is to turn on the second light source 116 to light up the second dot pattern 1142, and then display the application status of a plurality of numeral symbols 1143 and grid lines, etc., and (b) in Figure 3 is to turn on the second dot pattern 1142 A light source 115 causes the first dot pattern 1122 to be illuminated, thereby displaying the application status of a plurality of function symbols 1123 .

Please continue to refer to FIG. 4 , which is a schematic diagram of a stacked structure of a touch display device according to another embodiment of the present invention. The first light-incident side 1121 and the second light-incident side 1141 of this embodiment respectively have a bell mouth structure with a platform, and the first light-absorbing member 117 is at least attached to the platform area of the second light-incident side 1141, and the second light-absorbing The component 118 is at least attached to the platform area of the first light-incident side 1121 . The bell-mouth structure with a platform is shown in Figure 4, so that the thicknesses of the first light incident side 1121 and the second light incident side 1141 are respectively greater than the thicknesses of the opposite sides, thereby lifting the first light guide sheet 112 and the second light incident side 2. Light utilization efficiency of the light guide sheet 114. For such a thin sheet structure, the size of the side receiving light is mostly smaller than the size of the light source. Therefore, the first light-incident side 1121 and the second light-incident side 1141 respectively have a platform-shaped bell-mouth structure, which can transmit Increase the light receiving area to increase the amount of light entering the first light guide sheet 112 and the second light guide sheet 114, avoiding the waste of light energy and allowing the first light guide sheet 112 and the second light guide sheet 114 to have better light output brightness . Wherein, when the first light-incident side 1121 and the second light-incident side 1141 are bell mouth structures respectively, their thicknesses may be about 0.3 mm. In this structural state, the first light-absorbing member 117 can be directly attached to the platform position of the second light-incident side 1142, and the second light-absorbing member 118 can also be directly attached to the platform of the first light-incident side 1121. The position is set in a way, which can simplify the assembly process and reduce the difficulty of alignment, so as to achieve rapid assembly and truly block the light that should not enter. Among them, in order to block specific light more reliably, the first light-absorbing member 117 and the second light-absorbing The attachment range of the component 118 can also extend beyond the platform area to the inclined surface, as well as the local plane positions of the first light guide sheet 112 and the second light guide sheet 114, so that a more comprehensive light absorption shielding effect can be formed relative to the light to be blocked .

Further, under the aforementioned structural state, the thickness of the first light-absorbing member 117 and the second light-absorbing member 118 is 0.025-0.075 mm, which can effectively achieve the effect of shielding light and meet the thinning requirements, allowing the touch display device 1 to maintain overall Advantages of thin structure. In this embodiment, it is taken as an example that the thickness of the first light-absorbing member 117 and the second light-absorbing member 118 is 0.05 mm.

In this embodiment, the first light source 115 and the second light source 116 and the first light-incident side 1121 and the second light-incident side 1141 can also be arranged opposite to each other, as shown in FIG. 4 . More specifically, in this structural state, it can be defined that the first light guide sheet 112 further has a first high-beam side 1124 opposite to the first light-incident side 1121, and the first light-absorbing member 117 corresponds to the first high-beam side 1124, the second light guide sheet 114 further has a second far light side 1144 opposite to the second light incident side 1141, and the second light absorbing member 118 is set corresponding to the second far light side 1144, so as to effectively prevent the first light source 115 from The light enters the second light guide sheet 114 , and the light from the second light source 116 enters the first light guide sheet 112 . And in this embodiment, the first light-absorbing member 117 and the second light-absorbing member 118 can also use water glue mixed with black ink particle materials, the light-transmitting adhesive layer 113 can use water glue material, and the first dot pattern 1122 can also include a plurality of Functional symbols 1123 are located on the lower surface of the first light guide sheet 112, and the second dot pattern 1142 may also include a plurality of numeral symbols 1143 and are located on the lower surface of the second light guide sheet 114, so that the touch display device 1 acts on the second light source 116 When the first light source 115 acts, the screen shown in (a) of Figure 3 appears, and when the first light source 115 acts, the screen shown in (b) of Figure 3 appears.

Please refer to FIG. 5 again, which is a schematic diagram of a stacked structure of a touch display device according to a second embodiment of the present invention. In this embodiment, the platform of the first light incident side 1121 is provided with a first through hole 1125 for accommodating the first light source 115, and the platform of the second light incident side 1141 is provided with a second through hole 1145 for accommodate The second light source 116 . In order to improve the light utilization rate of the first light guide sheet 112 and the second light guide sheet 114, and achieve the effect of precise assembly and alignment, the first light source 115 and the second light source 116 are directly arranged on the first light incident side 1121 and the second light source. The first through hole 1125 and the second through hole 1145 on the two light incident sides 1141 are beneficial to the selection of assembly alignment, thereby also solving the problem of assembly of the light source and the light guide sheet.

Similarly, in this embodiment, the thickness of the first light-absorbing member 117 and the second light-absorbing member 118 can also be 0.025-0.075 mm, and the first light-incident side 1121 and the second light-incident side 1141 and the first light source 115 and The second light source 116 can be arranged oppositely, and then the first light guide sheet 112 and the second light guide sheet 114 respectively define a first high beam side 1124 and a second high beam side 1144, the first light absorbing member 117 and the second light absorbing The components 118 can be provided respectively corresponding to the first high beam side and the second high beam side. The material of the first light-absorbing member 117 and the second light-absorbing member 118 can also be made of water glue mixed with black ink particles, the light-transmitting adhesive layer 113 can be made of water glue material, and the first dot pattern 1122 can also include a plurality of functional symbols 1123 And located on the lower surface of the first light guide sheet 112, the second dot pattern 1142 may also include a plurality of numeral symbols 1143 and located on the lower surface of the second light guide sheet 114, so that the touch display device 1 appears when the second light source 116 acts. As the picture shown in (a) of Figure 3, when the first light source 115 acts, the picture shown in (b) of Figure 3 appears. For further explanations and achievable effects, etc., please refer to the corresponding paragraphs above, and will not repeat them here.

To sum up, the touch display device proposed by the present invention achieves the effect of keeping the ultra-thin light guide sheet horizontal and eliminating unexpected light emission through the structure of the inflexible rigid touch circuit substrate, thereby reducing the size of the device. The purpose of thinning the thickness. And under such a stacked module structure, the front light module can not only achieve the effect of dual display screens through the first light guide sheet and the second light guide sheet, but also enhance the display screen through the first light absorbing member and the second light absorbing member Accuracy and clarity, to avoid the bad application state that when one of the light guide sheets emits light, the dot pattern of the other light guide sheet also malfunctions and displays. Among the detailed features of specific implementation, the first light-absorbing member and the second light-absorbing member can be directly attached to the optical adhesive layer and the reflective material, for example. In this way, the assembly process can be effectively simplified and precise alignment effect can be maintained to improve the accuracy of light blocking. In addition, the first light-incident side and the second light-incident side can also be set as a trumpet structure with a platform to increase the amount of incident light and improve light utilization efficiency. In this structural state, the first light-absorbing member can be attached On the platform area of the first light-incident side, the second light-absorbing member can be attached to the platform area of the second light-incident side, so as to surely block the light. Furthermore, the first through-hole and the second through-hole can be further provided in the platform area of the first light-incident side and the second light-incident side, so that the first light source and the second light source can be accommodated inside, in addition to improving light In addition to the utilization rate, it can also make the transmission of light more accurate and reduce the chance of irradiating another light guide sheet.

To reiterate here, the present invention is a touch display device using at least two front light modules of light guide sheets, and has at least two display patterns. The double light guide sheets in the aforementioned embodiments are not only for guiding light To form the light, it is necessary to directly display the corresponding pattern for the user to see when the corresponding light source is turned on through the dot pattern on it. In the past, there may be an optical module with double light guide plates stacked, but most of them are backlight modules installed on the bottom side of the display panel, and are used to provide light to the display panel, or even just as a lighting fixture. In this application, the purpose of setting the double light guide plate is to achieve multi-color light mixing effect, to achieve double-sided display light or to facilitate segment control, etc. The content of the displayed screen depends on the control and adjustment of the display panel, not relying on the light guide plate Therefore, there is no need to install light absorbing parts to prevent the light source from entering the two light guide plates at the same time. On the other hand, in the field of touch display, in order to meet the demand for thinning, some technologies are achieved by using flexible circuit boards to reduce the thickness of circuit components. However, if the development is based on this basis, the matching light guide plate must have A certain thickness can avoid unexpected light emission at the bend. However, the present invention adopts a method of reducing the thickness of the light guide plate, and uses a thinner light guide plate as the main optical light output and display components. On this basis, the present invention selects an inflexible rigid touch circuit substrate to carry Light guide sheet, to keep the body of the light guide sheet consistent by virtue of its structural stiffness Leveling, to eliminate the above-mentioned unintended light phenomenon. Therefore, compared with the present invention, the prior art is a completely different technical means, and there is no possibility of mutual replacement.

1: Touch display device

10: Rigid touch circuit substrate

11: Front light module

111: reflective material

112: The first light guide sheet

1121: the first incident light side

1122: The first dot pattern

1123: function symbol

113: light-transmitting adhesive layer

114: The second light guide sheet

1141: the second incident light side

1142: Second dot pattern

1143: number symbol

115: The first light source

116: Second light source

117: The first light-absorbing member

118: Second light absorbing member

12: Optical adhesive layer

13: Protective cover

Claims (10)

A touch display device, comprising: A rigid touch circuit substrate, which is an inflexible board body; A front light module, located on the rigid touch circuit substrate, includes: a reflective material arranged on the upper surface of the rigid touch circuit substrate; A first light guide sheet, stacked on the reflective material, and has a first light incident side, and a first dot pattern is provided on the upper or lower surface of the first light guide sheet; a light-transmitting adhesive layer coated on the upper surface of the first light guide sheet; A second light guide sheet, stacked on the light-transmitting adhesive layer, and has a second light-incident side, and a second dot pattern is provided on the upper or lower surface of the second light guide sheet; a first light source for providing light to the first light guide sheet through the first light incident side; A second light source is used to provide light to the second light guide sheet through the second light incident side; wherein, the first light source and the second light source are respectively arranged on both sides of the front light module; a first light-absorbing member, used to block the light from the second light source from entering the first light-guiding sheet; and A second light-absorbing member, used to block the light from the first light source from entering the second light-guiding sheet; an optical adhesive layer coated on the upper surface of the second light guide sheet; and A protective cover is set on the optical adhesive layer; In this way, the first light guide sheet and the second light guide sheet maintain the levelness of the main body through the structural stiffness of the rigid touch circuit substrate, and when the first light source is activated, the first dots are displayed pattern, when the second light source is active, the second dot pattern is displayed. The touch display device according to claim 1, wherein the first light-absorbing element is attached to the reflective material, and the second light-absorbing element is attached to the optical adhesive layer. The touch display device according to claim 1, wherein the first light-incident side and the second light-incident side are bell-mouth structures with platforms respectively, and the first light-absorbing member is at least attached to the second light-incident side For the platform area on the light-incident side, the second light-absorbing member is at least attached to the platform area on the first light-incident side. The touch display device according to claim 3, wherein the thickness of the first light-absorbing member and the second light-absorbing member is 0.025-0.075mm. The touch display device as described in claim 3, wherein the platform on the first light-incident side is provided with a first through hole for accommodating the first light source, and the platform on the second light-incident side is provided with There is a second through hole for accommodating the second light source. The touch display device according to claim 5, wherein the first light guide sheet further has a first high light side opposite to the first light incident side, and the first light absorbing member corresponds to the first high light side Setting; the second light guide sheet further has a second far-beam side opposite to the second light-incident side, and the second light-absorbing member is disposed corresponding to the second far-beam side. The touch display device according to Claim 6, wherein the thickness of the first light-absorbing member and the second light-absorbing member is 0.025-0.075mm. The touch display device according to claim 1, wherein the thickness of the first light guide sheet and the second light guide sheet is 0.15 mm. The touch display device according to Claim 1, wherein the first light-absorbing member and the second light-absorbing member are made of water glue mixed with black ink particle material, and the light-transmitting adhesive layer is made of water glue material. The touch display device according to claim 1, wherein the first dot pattern includes a plurality of functional symbols and is located on the lower surface of the first light guide sheet, and the second dot pattern at least includes a plurality of numeral symbols and is located on the The lower surface of the second light guide sheet.

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