Patent Publication Number: US-2023146459-A1

Title: Photosensitive color-changing touch control display device

Description:
FIELD OF INVENTION 
     The present disclosure relates to the field of display technology, and more particularly, to a photosensitive color-changing touch control display device. 
     BACKGROUND OF INVENTION 
     Large-size liquid crystal display devices in commercial display application, especially in a field of conference integrated machines and electronic whiteboards, have a wide market demand. For conference integrated machines and electronic whiteboards, liquid crystal display devices are required to meet multi-functional requirements. Firstly, in conference scenes or educational scenes under ambient light, the liquid crystal display devices have a good wide-angle visibility to realize meeting interaction. Secondly, conference panels need to have touch control function in the conference scenes to realize conference interaction. Thirdly, in a conference industry and an education industry, users want to have a visual effect of laser pointer to realize a function of teaching pointer. However, traditional TV display modules have difficulty in achieving the above multimedia effects. 
     Therefore, current liquid crystal display technology urgently needs to be improved. 
     SUMMARY OF INVENTION 
     An embodiment of the present disclosure provides a photosensitive color-changing touch control display device to solve a technical problem that current display panel cannot meet multi-function requirements of a touch control function and a laser pointer with a visual effect at the same time in conference scenes or an educational scene. 
     In order to solve the above problems, technical solutions provided by the present disclosure are as follows. 
     The embodiment of the present disclosure provides a photosensitive color-changing touch control display device. The photosensitive color-changing touch control display device comprises a display panel, a photosensitive color-changing touch control panel, a driving chip, and a central processing unit. The photosensitive color-changing touch control panel comprises a plurality of touch control electrodes and a plurality of photoresistors. The driving chip is electrically connected to the photoresistors to obtain a current change signal of the photoresistors. The central processing unit is electrically connected to the driving chip and the display panel. Wherein, when a resistance of the photoresistor changes, the driving chip transmits the obtained current change signal to the central processing unit, and the central processing unit controls the display panel corresponding to a region where a current change occurs to change color. The photosensitive color-changing touch control display device further comprises a polarizer disposed on the photosensitive color-changing touch control panel. The photoresistors and the touch control electrodes are disposed on a same layer. 
     In at least one embodiment of the present disclosure, the photosensitive color-changing touch control display panel further comprises a base substrate disposed on the display panel, and the plurality of touch control electrodes and the plurality of photoresistors are disposed on the base substrate. 
     In at least one embodiment of the present disclosure, in a horizontal direction, the photoresistors and the touch control electrodes are alternately arranged on the base substrate. 
     In at least one embodiment of the present disclosure, the driving chip is further connected to the touch control electrodes to obtain touch signals from the touch control electrodes. 
     In at least one embodiment of the present disclosure, the photosensitive color-changing touch control display device further comprises a touch control driving chip, the touch control driving chip is connected to the touch control electrodes and the central processing unit, and the touch control driving chip is configured to obtain touch signals from the touch control electrodes. 
     In at least one embodiment of the present disclosure, the central processing unit further controls the display panel to make a touch feedback display. 
     In at least one embodiment of the present disclosure, the display panel comprises an array substrate and a color film substrate that are oppositely arranged, and the photoresistors and the touch control electrodes may be disposed in the array substrate or the color film substrate of the display panel. 
     The embodiment of the present disclosure further provides a photosensitive color-changing touch control display device. The photosensitive color-changing touch control display device comprises a display panel, a photosensitive color-changing touch control panel, a driving chip, and a central processing unit. The photosensitive color-changing touch control panel comprises a plurality of touch control electrodes and a plurality of photoresistors. The driving chip is electrically connected to the photoresistors to obtain a current change signal of the photoresistors. The central processing unit is electrically connected to the driving chip and the display panel. Wherein, when a resistance of the photoresistor changes, the driving chip transmits the obtained current change signal to the central processing unit, and the central processing unit controls the display panel corresponding to a region where a current change occurs to change color. 
     In at least one embodiment of the present disclosure, the photoresistors and the touch control electrodes are disposed on a same layer. 
     In at least one embodiment of the present disclosure, the photoresistors and the touch control electrodes are disposed on different layers. 
     In at least one embodiment of the present disclosure, the photosensitive color-changing touch control display panel further comprises a base substrate disposed on the display panel, and the plurality of touch control electrodes and the plurality of photoresistors are disposed on the base substrate. 
     In at least one embodiment of the present disclosure, in a horizontal direction, the photoresistors and the touch control electrodes are alternately arranged on the base substrate. 
     In at least one embodiment of the present disclosure, the photosensitive color-changing touch control display device further comprises a polarizer disposed on the photosensitive color-changing touch control panel. 
     In at least one embodiment of the present disclosure, wherein the driving chip is connected to the touch control electrodes to obtain touch signals from the touch control electrodes. 
     In at least one embodiment of the present disclosure, the photosensitive color-changing touch control display device further comprises a touch control driving chip, the touch control driving chip is connected to the touch control electrodes and the central processing unit, and the touch control driving chip is configured to obtain touch signals from the touch control electrodes. 
     In at least one embodiment of the present disclosure, the central processing unit controls the display panel to make a touch feedback display. 
     In at least one embodiment of the present disclosure, the display panel comprises an array substrate and a color film substrate that are oppositely arranged, and the photoresistors and the touch control electrodes may be disposed in the array substrate or the color film substrate of the display panel. 
     In at least one embodiment of the present disclosure, the photoresistors is one of ultraviolet photoresistors, visible light photoresistors, or infrared photoresistors. 
     In at least one embodiment of the present disclosure, a material of the photoresistors is one of cadmium sulfide, cadmium selenide, lead sulfide, lead telluride, lead selenide, or indium antimonide. 
     In at least one embodiment of the present disclosure, a backlight module is disposed below the display panel. 
     A photoresistor is disposed on a substrate with a touch control function to realize a multimedia integrated display panel with a photosensitive color-changing function and a touch control function. When the photoresistor is irradiated by a laser pointer and a resistance changes, by collecting current change information, the driving chip feeds back a position where current change occurs to the central processing unit, and the central processing unit controls the display panel at a corresponding position to change colors. Therefore, a trajectory of a laser pointer irradiation is revealed, and multifunctional applications of liquid crystal display devices in the conference scene or the education scene is realized. 
    
    
     
       DESCRIPTION OF DRAWINGS 
         FIG.  1    is a schematic structural diagram of a photosensitive color-changing touch control display panel provided by an embodiment of the present disclosure. 
         FIG.  2    is a schematic structural diagram of a photosensitive pattern provided by the embodiment of the present disclosure. 
         FIG.  3    is schematic structural diagram of a photosensitive color-changing touch control display device provided by the embodiment of the present disclosure. 
         FIG.  4    is a schematic diagram of touch signals and photosensitive signals of the photosensitive color-changing touch control display panel provided by the embodiment of the present disclosure. 
         FIG.  5    is a signal processing flowchart of the photosensitive color-changing touch display device provided by the embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
     The present disclosure provides a photosensitive color-changing touch control display device. In order to make a purpose, technical solutions, and effects of the present disclosure clearer, following describes the present disclosure in further detail with reference to accompanying drawings and examples. It should be understood that specific embodiments described herein are only used to explain the present disclosure, and are not used to limit the present disclosure. 
     As shown in  FIG.  1    and  FIG.  3   , an embodiment of the present disclosure provides a photosensitive color-changing touch control display device  100  comprising a display panel  20  and a photosensitive color-changing touch control panel  10 . The photosensitive color-changing touch control panel  10  comprises a plurality of touch control electrodes  12  and a plurality of photoresistors  13 . 
     Current liquid crystal display devices are applied in conference scenes. Users want to have a display panel with a touch control function to realize meeting interaction. In the conference scenes and education scenes, users want to have a laser pointer with a visual effect to realize an indicator function. However, traditional TV display modules have difficulty in achieving the above multimedia effects. The embodiment of the present disclosure can solve the above defects. Photoresistors are integrated on a touch control panel. When exposed to ultraviolet light, a resistance of the photoresistor will change, which will cause current in a corresponding region to change. Current information will be collected by a signal processor to control a display panel at a corresponding position to change color to show a trajectory of the laser pointer. 
     The touch control electrodes  12  are configured to realize the touch control function. The touch control electrodes  12  comprise touch control sensing electrodes and touch control driving electrodes, and the touch control sensing electrodes and the touch control driving electrodes may be disposed in a same layer or on different layers. 
     When the touch control sensing electrodes and the touch control driving electrodes are arranged in the same layer, the touch control sensing electrodes are disconnected at an intersection with the touch control driving electrodes, and the disconnected touch control sensing electrodes can be connected through a bridge electrode. It can be understood that the disconnected electrodes may also be the touch control driving electrodes. 
     When the touch control sensing electrodes and the touch control driving electrodes are disposed in different layers, an insulating layer may be disposed between the touch control sensing electrodes and the touch control driving electrodes to achieve a purpose of insulation. 
     The photoresistor  13  and the touch control electrode  12  may be disposed in the same layer or in different layers. When the photoresistor  13  and the touch control electrode  12  are disposed in different layers, an insulating layer may be disposed between the two for insulation. 
     In one embodiment, as shown in  FIG.  1   , the photoresistor  13  and the touch control electrode  12  may be disposed in the same layer to reduce a thickness of the panel. 
     Specifically, the photoresistor  13  may be disposed in the same layer as one of the touch control sensing electrode and the touch control driving electrode of the touch control electrode  12 . 
     In one embodiment, the photoresistor  13  and the touch control electrode  12  are alternately arranged on a base substrate, so that a functional region of the photosensitive color-changing touch control panel  10  comprises the photoresistor  13  and the touch control electrode  12 . The functional region refers to a region irradiated with laser light and a touch control region. 
     In one embodiment, the photosensitive color-changing touch control display panel  10  further comprises the base substrate  11 , and the plurality of photoresistors  13  and the plurality of touch control electrodes  12  are disposed on the base substrate 11 . The photosensitive color-changing touch control panel  10  can be bonded to the display panel  20  through an optical adhesive layer. 
     Specifically, the base substrate  11  of the photosensitive touch control panel  10  is bonded to the display panel  20 . 
     The photoresistor  13  and the touch control electrode  12  may be strip-shaped. In a horizontal direction, the photoresistor  13  and the touch control electrode  12  are alternately arranged on the base substrate  11 . 
     The photoresistor  13  and the touch control electrode  12  may also be other shapes such as square, diamond, and grid, which are not limited here. 
     In one embodiment, the photosensitive touch control panel  10  may be directly disposed on the display panel  20 , that is, the photoresistor  13  and the touch control electrode  12  are directly prepared on a part of a film layer of the display panel  20 . 
     In one embodiment, as shown in  FIG.  2   , one photoresistor  13  may be composed of a plurality of thin strip-shaped resistance lines arranged in parallel. 
     The photosensitive color-changing touch control panel  10  further comprises a plurality of electrode terminals  14 , and the electrode terminals may be disposed on the base substrate  11 . 
     The electrode terminal  14  is connected to the photoresistor  13 , and the electrode terminal  14  may be disposed in a non-functional region of the photosensitive color-changing touch control panel  10 . 
     As shown in  FIG.  4   , the touch control electrode  12  is also connected to the electrode terminal  14 , and the electrode terminal  14  is connected to an external device to transmit touch signals and photosensitive signals of the photosensitive color-changing touch control panel  10 . The touch signal comprises position information and current change information of touch points, and the photosensitive signal comprises point information and current change information of laser irradiation. 
     The photoresistors  13  is one of ultraviolet photoresistors, visible light photoresistors, or infrared photoresistors. 
     When the photoresistor  13  is the ultraviolet photoresistor, a material of the photoresistors is cadmium sulfide, cadmium selenide, etc. may be configured to detect ultraviolet rays. 
     When the photoresistor  13  is the infrared photoresistor, the material of the photoresistors is lead sulfide, lead telluride, lead selenide, and indium antimonide, which is configured to detect infrared rays. 
     The photosensitive color-changing touch control panel can be applied to a display panel, and can be of in cell or on cell structures. The display panel can be a liquid crystal display panel or an organic light-emitting diode (OLED) display panel. 
     In one embodiment, a liquid crystal display panel and on cell structure are used as examples. As shown in  FIG.  3   , the display panel  20  comprises an array substrate  21 , a liquid crystal layer  22 , and a color film substrate  23  that are sequentially laminated. The photosensitive color-changing touch control panel  10  is disposed on the color film substrate  23 . 
     In one embodiment, the photosensitive color-changing touch control panel  10  can be bonded to the display panel  20  through the optical adhesive layer. Specifically, the base substrate  11  of the photosensitive color-changing touch control panel  10  is bonded to the color film substrate  23  of the display panel  20 . 
     In one embodiment, the photosensitive color-changing touch control panel  10  may be of an in cell structure, that is, the photosensitive color-changing touch control panel may be embedded inside the display panel  20 , and the photoresistor and the touch control electrode may be disposed in the array substrate  21  or the color film substrate  23  of the display panel  20 . 
     As shown in  FIG.  5   , the photosensitive color-changing touch control display device  100  further comprises a driving chip  70  and a central processing unit  80  electrically connected to the driving chip  70 , and the central processing unit  80  is further connected to the display panel  20 . The driving chip  70  is configured to obtain a photosensitive signal (namely a current change signal) of the photoresistor  13 , and the central processing unit  80  controls the display panel  20  at a corresponding position to change color according to the current change signal. 
     When the resistance of the photoresistor  13  changes, the driving chip  70  transmits the obtained current change signal to the central processing unit  80 , and the central processing unit  80  controls the display panel  20  corresponding to a region where a current change occurs to change color. 
     For example, when an ultraviolet laser pointer is irradiated onto the functional region on the photosensitive color-changing touch panel  10 , the resistance of the photoresistor  13  at an irradiation position changes, so that current changes at a position of the photoresistor  13 . The driving chip  70  obtains the position where current change occurs, and feeds back the current change signal to the central processing unit  80 , and the central processing unit  80  controls the display panel at the current change position to change the color. For example, controlling the display panel at the position to display red, so that naked eyes see an irradiation region of the laser pointer displaying red. Therefore, an irradiation trajectory of the laser pointer can be obtained instantly. 
     When the plurality of photoresistors  13  on the photosensitive color-changing touch control panel  10  are not irradiated with laser light, the resistance of the photoresistor  13  is a fixed value F, and current change at a position of the photoresistor  13  monitored by the driving chip  70  is zero, that is, the monitored current value remains unchanged. At this time, the central processing unit will not issue a control command to the display panel  20 , and the display panel  20  performs normal touch control display. When the laser pointer is irradiated on the photoresistor  13  at a certain position, the photoresistor changes its resistance due to the laser irradiation, and the resistance of the photoresistor is F′, the driving chip  70  monitors that the current value at the position changes, and a current change amount can be preset to be ΔI. When an actual monitored current value change exceeds the ΔI range value, the central processing unit controls the display panel  20  corresponding to the position to change the display color, that is, the region corresponding to the position irradiated by the laser in real time is displayed in red. 
     In one embodiment, a touch control chip may be integrated with a photosensitive chip, that is, the driving chip  70  may also obtain the touch signal of the touch control electrode  12 , so that the touch signal feeds back to the central processing unit  80 , and the central processing unit  80  controls the display panel  20  to make a touch feedback display. 
     In one embodiment, the photosensitive color-changing touch control display device  100  further comprises a touch control driving chip, the touch control driving chip is connected to the touch control electrodes  12  and the central processing unit  80 , and the touch control driving chip is configured to obtain touch signals from the touch control electrodes, so that the touch signal feeds back to the central processing unit  80 , and the central processing unit  80  controls the display panel  20  to make a touch feedback display. 
     As shown in  FIG.  3   , the photosensitive color-changing touch control display device  100  further comprises a polarizer  40  disposed on the photosensitive color-changing touch panel  10 , an air interval  101  is defined between the polarizer  40  and the photosensitive color-changing touch panel  10 , and the polarizer  40  is configured to reduce mixed light entering the air interval  101 . 
     A backlight module  60  is disposed below the display panel  20  and is configured to provide backlight. 
     Two opposite sides of the display panel  20  are respectively provided with an upper polarizer  30  and a lower polarizer. The upper polarizer  30  is disposed between the color film substrate  23  and the photosensitive color-changing touch panel  10 . The upper polarizer  30  may be a polarizer with a wide viewing angle, so that the backlight light has a wider viewing angle after being emitted from a display surface. Therefore, in conference scenes or educational scene under ambient light, meeting interaction is realized with a good wide-angles visibility. 
     The polarizer  40  is covered by a protective cover plate  50 , and a light-emitting surface of the protective cover plate  50  can be treated with antiglare (AG). The light-emitting surface of the protective cover plate  50  is processed with fine unevenness to prevent light from directly entering the eyes, thereby effectively reducing glare and reflection, and improving display effect. 
     The photoresistor is disposed on a substrate with a touch control function to realize a multimedia integrated display panel with a photosensitive color-changing function and a touch control function. When the photoresistor is irradiated by the laser pointer and a resistance changes, by collecting current change information, the driving chip feeds back a position where current change occurs to the central processing unit, and the central processing unit controls the display panel at a corresponding position to change colors. Therefore, a trajectory of a laser pointer irradiation is revealed, and multifunctional applications of liquid crystal display devices in the conference scene or the education scenes are realized. 
     In the above embodiments, the description of each embodiment has its own emphasis. For a part that is not detailed in an embodiment, referring to the related descriptions of other embodiments. 
     It can be understood that for those of ordinary skill in the art, equivalent replacements or changes can be made according to the technical solutions and inventive concepts of the present disclosure, and all such changes or replacements should fall within the protection scope of the claims appended to the present disclosure.