TWI815468B - Display device - Google Patents

Abstract

The present disclosure provides a display device, including multiple first light emitting circuits, multiple second light emitting circuits, and a driving circuit. The first and second light emitting circuits are arranged on a substrate. The driving circuit is arranged outside the substrate and configured to generate a first current signal and a second current signal. The first current signal and the second current signal have different amplitudes and duty cycles. The driving circuit is configured to transmit the first current signal to at least one of the first light emitting circuits and transmit the second current signal to at least one of the second light emitting circuits. The at least one of the first light emitting circuits and the at least one of the second light emitting circuits are configured to receive the first current signal and the second current signal respectively and emit light.

Description

display device

The present case relates to a display device, and in particular to a display device including a plurality of first light-emitting circuits, a plurality of second light-emitting circuits and a driving circuit.

When consumers use electronic products such as mobile phones or laptops, the display of the electronic product may display important business information or private personal information. If others use a camera or other shooting device to take pictures of the display of an electronic product, they can obtain important information about consumers. Although when a camera is used to photograph the display of an electronic product, since the shutter frequency of the camera is higher than the refresh rate of the display, the image captured by the camera may have bright and dark lines or scanning lines, but the important information is still clear enough and may be captured by malicious persons. Scholars use.

An embodiment of the present invention provides a display device including a plurality of first light-emitting circuits, a plurality of second light-emitting circuits and a driving circuit. The first light-emitting circuit and the second light-emitting circuit are disposed on the substrate. The driving circuit is disposed outside the substrate and used to generate the first current signal and the second current signal. The first current signal and the second current signal have different amplitudes and duty cycles. The driving circuit is used to transmit a first current signal to at least one of the first light-emitting circuits, and transmit a second current signal to at least one of the second light-emitting circuits. At least one of the first light-emitting circuits and at least one of the second light-emitting circuits are used to respectively receive the first current signal and the second current signal and emit light.

Another embodiment of the present invention provides a display device including a plurality of first light-emitting circuits, a plurality of second light-emitting circuits and a plurality of driving circuits. The first light-emitting circuit and the second light-emitting circuit are disposed on the substrate. The driving circuit is disposed on the substrate and electrically connected to at least one of the first light-emitting circuits and at least one of the second light-emitting circuits. Each of the driving circuits includes a pulse signal generator and a current generator. The pulse signal generator is used to generate the first pulse signal and the second pulse signal. The first pulse signal and the second pulse signal have different amplitudes and duty cycles. The current generator is used to generate a first current signal according to the first pulse signal, and to generate a second current signal according to the second pulse signal. The first current signal and the second current signal have different amplitudes and duty cycles.

The following embodiments are described in detail with the accompanying figures. However, the embodiments provided are not intended to limit the scope of the present disclosure, and the description of the structural operation is not intended to limit its execution sequence. Any recombination of components Structures and devices with equal functions are all within the scope of this disclosure. In addition, the illustrations are for illustrative purposes only and are not drawn to original size. To facilitate understanding, the same elements or similar elements will be designated with the same symbols in the following description.

In this article, unless the context specifically limits the article, "a" and "the" can generally refer to one or more. In addition, the words "includes," "includes," "having," and similar words used herein are used to specify the described features, regions, integers, steps, operations, elements and/or components.

When an element is described herein as being "connected," "coupled," or "electrically connected" to another element, that element can be directly connected, directly coupled, or directly electrically connected to the other element. An additional component may also exist between the two components, and the component may be indirectly connected, indirectly coupled, or indirectly electrically connected to the other component. In addition, although terms such as "first", "second", ... are used to describe different components in this document, these terms are only used to distinguish components or operations described with the same technical terms.

Some embodiments of the present disclosure provide a display device. Please refer to picture 1. Figure 1 is a schematic diagram of a display device 100 according to some embodiments of the present disclosure. The display device 100 includes a substrate 120 and a control board 140 . The control board 140 is provided outside the substrate 120 .

The substrate 120 includes a plurality of general light-emitting areas 122 and a plurality of variable-frequency light-emitting areas 124 . As shown in FIG. 1 , the general light-emitting area 122 is a white square in the substrate 120 , and the variable frequency light-emitting area 124 is a square with diagonal lines in the substrate 120 . A light-emitting circuit (not shown in Figure 1) is provided in each of the general light-emitting area 122 and the variable frequency light-emitting area 124, and the light-emitting circuit is used to receive current signals and emit light.

The control board 140 is used to control the light-emitting circuits provided in the general light-emitting area 122 and the variable frequency light-emitting area 124, and the control board 140 includes a driving circuit 150. The driving circuit 150 is used to generate a current signal and transmit the current signal to the light-emitting circuit through wiring (such as the wiring L1 ~ L4 in Figure 1) to drive the light-emitting circuit to emit light.

In some embodiments, the driving circuit 150 includes a pulse signal generator 152 and a current generator 154. The pulse signal generator 152 is electrically connected to the current generator 154 . The pulse signal generator 152 is used to generate a pulse signal and send the pulse signal to the current generator 154 . The current generator 154 is used to generate a current signal according to the received pulse signal, and transmit the current signal to the light-emitting circuit in the substrate 120 .

The following paragraphs will take the general light-emitting area 122 and the variable-frequency light-emitting area 124 in Figure 1 as examples to illustrate the operational differences between the two light-emitting areas. To keep the diagram simple, the light-emitting circuits in the general light-emitting area 122 and the variable frequency light-emitting area 124 are not shown in Figure 1 . The details of the light-emitting circuit are explained below with Figure 2.

Please refer to Figure 1 and Figure 2 at the same time. FIG. 2 is a partial schematic diagram of the display device 100 in FIG. 1 according to some embodiments of the present disclosure. Figure 2 uses the same numbers as those in Figure 1 to represent the same components. The general light-emitting area 122a and the variable frequency light-emitting area 124a in Figure 2 correspond to the general light-emitting area 122 and the variable frequency light-emitting area 124 in Figure 1, and the Figure 2 omits the substrate 120 and other details of the display device 100 shown in Figure 1 .

As shown in FIG. 2 , the general light-emitting area 122a and the variable-frequency light-emitting area 124a are adjacent to each other. The light-emitting circuit D1 is arranged in the general light-emitting area 122a, and the light-emitting circuit D2 is arranged in the variable frequency light-emitting area 124a. In some embodiments, each general light-emitting area 122 in the display device 100 in Figure 1 is provided with a light-emitting circuit similar to the light-emitting circuit D1, and each variable frequency light-emitting area 124 is provided with a light-emitting circuit similar to the light-emitting circuit D2.

In the embodiment of FIG. 2, the light-emitting circuit D1 and the light-emitting circuit D2 are both a light emitting diode. It should be noted that the embodiment of Figure 2 is only illustrative in nature. In different embodiments, the light-emitting circuits disposed in the general light-emitting area 122a and other general light-emitting areas 122 in Figure 1 may include multiple light-emitting diodes, additional transistors and circuits, and are disposed in the variable frequency light-emitting area 124a and The light-emitting circuits of other variable frequency light-emitting areas 124 in the figure may include multiple light-emitting diodes, additional transistors and circuits.

As shown in FIG. 2 , the control board 140 includes a driving circuit 150 , and the driving circuit 150 includes a pulse signal generator 152 and a current generator 154 .

The pulse signal generator 152 is used to generate pulse signals PS1 and PS2, and transmit the pulse signals PS1 and PS2 to the current generator 154 electrically connected to the pulse signal generator 152. The pulse signals PS1 and PS2 have different amplitudes and duty cycles.

The current generator 154 is used to receive the pulse signals PS1 and PS2 from the pulse signal generator 152, generate the current signal CS1 according to the pulse signal PS1, and generate the current signal CS2 according to the pulse signal PS2. The current signals CS1 and CS2 have different amplitudes and duty cycles.

In other words, the driving circuit 150 is used to generate two different current signals CS1 and CS2 through the pulse signal generator 152 and the current generator 154, and then transmit the current signal CS1 to the light-emitting circuit provided in the general light-emitting area 122a through the wiring L1. the anode of D1, and transmits the current signal CS2 to the anode of the light-emitting circuit D2 provided in the frequency conversion light-emitting area 124a through the trace L3. When the light-emitting circuit D1 receives the current signal CS1, the light-emitting circuit D1 emits light according to the current signal CS1. When the light-emitting circuit D2 receives the current signal CS2, the light-emitting circuit D2 emits light according to the current signal CS2.

The cathode of the light-emitting circuit D1 is electrically connected to the control board 140 through the trace L2, and the cathode of the light-emitting circuit D2 is electrically connected to the control board 140 through the trace L4. In some embodiments, the cathode of the light-emitting circuit D1 and the cathode of the light-emitting circuit D2 are further connected to ground or other circuits in the control board 140 .

In some embodiments, the pulse signal generator 152 includes a pulse width modulation circuit M1 and a pulse amplitude modulation circuit M2. The pulse width modulation circuit M1 is used to modulate the duty cycle of the pulse signals PS1 and PS2. The amplitude modulation circuit M2 is connected to the pulse width modulation circuit M1 and used to modulate the amplitudes of the pulse signals PS1 and PS2.

The following paragraphs are combined with Figure 3A to illustrate the differences in amplitude and duty cycle of the current signals CS1 and CS2, and the resulting differences in the brightness of the light-emitting circuits D1 and D2. Please refer to Figure 2 and Figure 3A at the same time. Figure 3A is a timing diagram of current signals CS1 and CS2 according to some embodiments of the present disclosure. In the embodiment of FIG. 3A, the lengths of the period P1 and the period P2 are both 1/2 T, and the length of the period P3 is 1 T. As shown in Figure 3A, in the period of 0 to 1 T seconds (that is, the period P3), the amplitude of the current signal CS1 is 1 H, that is, the current signal CS1 is 1 H ampere. In the period of 0 to 1/2 T seconds (that is, the period P1), the amplitude of the current signal CS2 is 2 H, that is, the current signal CS2 is 2 H amps. In the period from 1/2 T second to 1 T second (that is, the period P2), the amplitude of the current signal CS2 is 0, that is, the current signal CS2 is 0 ampere. Accordingly, in any one of the periods P1, P2 and P3, the current signals CS1 and CS2 have different amplitudes.

In addition, assuming that the periods of the current signals CS1 and CS2 are both 2 T seconds, according to Figure 3A, the current signals CS1 and CS2 have different duty cycles. In some embodiments, the duty cycle may be defined as the ratio of the total time in a cycle during which the current signal amplitude is greater than zero to the total time in the cycle. If the periods of current signals CS1 and CS2 are both 2 T seconds, then the duty cycle of current signal CS1 is 1/2, and the duty cycle of current signal CS2 is 1/4.

In some embodiments, regarding the generation of the current signals CS1 and CS2, the pulse signal generator 152 first generates pulses with different amplitudes and duty cycles through the pulse width modulation circuit M1 and the pulse amplitude modulation circuit M2. The signals PS1 and PS2 are then generated by the current generator 154 according to the pulse signals PS1 and PS2. The amplitude and duty cycle of the current signals CS1 and CS2 respectively correspond to the amplitude and duty cycle of the pulse signals PS1 and PS2.

In some embodiments, the pulse width modulation circuit M1 is used to modulate the duty cycle of the pulse signals PS1 and PS2, so that the duty cycle of the current signal CS1 generated by the current generator 154 is 1/2, and the current The duty cycle of signal CS2 is 1/4.

In some embodiments, the pulse amplitude modulation circuit M2 is used to modulate the amplitude of the pulse signals PS1 and PS2, so that the amplitude of the current signal CS1 generated by the current generator 154 is 1 H, and the amplitude of the current signal CS2 is 2H.

As shown in Figure 3A, during the period P1, the current integral of the current signal CS1 over time is half of the area A1, that is, 1 H × 1/2 T, which is equal to 1/2 H × T. This integral represents the brightness of the light-emitting circuit D1 that receives the current signal CS1 when it is illuminated by the light source for the exposure time of period P1. On the other hand, in the period P1, the integral of the current of the current signal CS2 with respect to time is the area A2, that is, 2 H × 1/2 T, which is equal to 1 H × T. This integral represents the brightness of the light-emitting circuit D2 that receives the current signal CS2 when it is illuminated by the light source for the exposure time of the period P1.

In some embodiments, using a light source to illuminate the light-emitting circuits D1 and D2 with a specific exposure time means using a shooting device (such as a camera) to capture images of the light-emitting circuits D1 and D2 with a specific exposure time.

Accordingly, in the period P1, the integral of the current of the current signal CS1 with respect to time (1/2 H×T) is less than the integral of the current with time of the current signal CS2 (1 H×T), but is only the current of the current signal CS2 Half of the integral over time. In other words, when a photographing device is used to photograph the light-emitting circuits D1 and D2 with the exposure time of the period P1, the light-emitting circuit D1 will have a lower brightness, while the light-emitting circuit D2 will have a higher brightness.

In the period P2, the current integral of the current signal CS1 over time is half of the area A1, that is, 1 H × 1/2 T, which is equal to 1/2 H × T. This integral represents the brightness of the light-emitting circuit D1 that receives the current signal CS1 when it is illuminated by the light source for the exposure time of period P2. On the other hand, in period P2, the integral of the current signal CS2 over time is equal to 0. This integral represents the brightness of the light-emitting circuit D2 receiving the current signal CS2 when it is illuminated by the light source for the exposure time of period P2.

Accordingly, in the period P2, the current integral of the current signal CS1 over time (1/2 H×T) is greater than the current integral over time of the current signal CS2 (0), and the current integral of the current signal CS2 over time is equal to 0. . In other words, when a photographing device is used to photograph the light-emitting circuits D1 and D2 with the exposure time of the period P2, the light-emitting circuit D1 will have a higher brightness, while the light-emitting circuit D2 will have a lower brightness.

In the period P3, the integral of the current of the current signal CS1 with respect to time is the area A1, that is, 1 H × 1 T, which is equal to 1 H × T. This integral represents the brightness of the light-emitting circuit D1 that receives the current signal CS1 when it is illuminated by the light source for the exposure time of period P3. On the other hand, in the period P3, the integral of the current of the current signal CS2 with respect to time is the area A2, that is, 2 H × 1/2 T, which is equal to 1 H × T. This integral represents the brightness of the light-emitting circuit D2 that receives the current signal CS2 when it is illuminated by the light source for the exposure time of period P3.

Accordingly, in the period P3, the current integral of the current signal CS1 over time is equal to the current integral of the current signal CS2 over time, and the integral of both currents over time is equal to 1 H×T. In other words, when a photographing device is used to photograph the light-emitting circuits D1 and D2 with the exposure time of the period P3, the light-emitting circuit D1 and the light-emitting circuit D2 will have the same brightness.

According to the above description of the embodiment of FIG. 3A , if the light-emitting circuits D1 and D2 are photographed with the exposure time of period P1 or period P2, the light-emitting circuits D1 and D2 will display different brightnesses. In addition, if the light-emitting circuits D1 and D2 are photographed with other exposure times (such as the period from 1/4 T to 3/4 T, the period from 0 to 3/5 T, or other periods), due to the relationship between the current of the current signal CS1 and the time, The integral and time integral of the current signal CS2 are not the same, and the light-emitting circuits D1 and D2 will also display different brightnesses.

In some embodiments, when the light-emitting circuits D1 and D2 are photographed with a specific exposure time, the light-emitting circuit D2 has a relatively low brightness and the light-emitting circuit D1 has a relatively high brightness, so the substrate 120 has a variable frequency light-emitting area of the light-emitting circuit D2 124 will have relatively low brightness, and the general light-emitting area 122 with the light-emitting circuit D1 in the substrate 120 will have relatively high brightness. In this embodiment, the frequency conversion light-emitting area 124 with lower brightness will appear on the substrate 120 as shown in FIG. 1 .

In the embodiment of FIG. 1 , the lower brightness frequency conversion light-emitting area 124 forms a pattern similar to the word “AUO”. It should be noted that the embodiment of Figure 1 is only illustrative in nature. In different embodiments, the general light-emitting area 122 and the variable-frequency light-emitting area 124 in the display device 100 may have different settings and arrangements, so that when the general light-emitting area 122 and the variable-frequency light-emitting area 124 receive different current signals CS1 and CS2 respectively, and are When the photographing device takes a picture, the variable frequency light-emitting area 124 will present a pattern different from that of the embodiment in Figure 1 .

In some embodiments, based on the general light-emitting area 122 and the variable frequency light-emitting area 124 with different brightness, the picture and content displayed by the display device 100 will have a difference between bright and dark, and the picture displayed by the display device 100 can be avoided. The information was clearly captured by someone else's camera device.

In addition, as mentioned above, if a photographing device is used to photograph the light-emitting circuits D1 and D2 with the exposure time of the period P3, the light-emitting circuits D1 and D2 will display the same brightness. If the light-emitting circuits D1 and D2 are photographed with a multiple of the period P3 or with an exposure time much longer than the period P3, the light-emitting circuits D1 and D2 will also display the same or almost the same brightness. Accordingly, when a user observes the display device 100 in FIG. 1 with the naked eye, although the current signals CS1 and CS2 respectively received by the light-emitting circuits D1 and D2 are different, the user's eyes are much longer than the period P3. time to observe the light-emitting circuits D1 and D2. In such a long period of time, the current integral of the current signal CS1 over time will be similar to the current integral of the current signal CS2 over time. Therefore, the light-emitting circuits D1 and D2 seen by the user have Same or close to the same brightness.

Please refer to Figure 3B. Figure 3B is a timing diagram of current signal CS2 according to some embodiments of the present disclosure. In some embodiments, through the modulation of the pulse width modulation circuit M1 and the pulse amplitude modulation circuit M2 in the pulse signal generator 152, the current signal CS2 may have a different amplitude and amplitude from the current signal CS2 shown in FIG. 3A. duty cycle.

For example, the current signal CS2 received by the light-emitting circuit D2 in Figure 2 can be the current signal CS2a in Figure 3B. Relative to the current signal CS1 received by the light-emitting circuit D1 (having the timing shown in the current signal CS1 in FIG. 3A), the current signal CS2a in FIG. 3B has a phase difference PD.

In some embodiments, within the period of 0 to 1 T seconds, the integral of the current and time of the current signal CS1 (that is, the area A1, whose size is equal to 1 H×T) and the integral of the current and time of the current signal CS2a ( That is, the area A3, whose size is equal to 1 H × T) is the same, so when the light-emitting circuits D1 and D2 are illuminated by the light source with an exposure time of 0 to 1 T seconds, the light-emitting circuits D1 and D2 have the same brightness.

In some embodiments, within the period from the phase difference PD to the phase difference PD plus 1/2 T seconds, the integral of the current and time of the current signal CS1 (equal to 1/2 H × T) is equal to the current sum of the current signal CS2a The integral of time (that is, the area A3, whose size is equal to 1 H×T) is not the same, so when the light-emitting circuits D1 and D2 are illuminated by the light source with an exposure time of phase difference PD to phase difference PD plus 1/2 T second , the light-emitting circuits D1 and D2 have different brightness.

For another example, in some embodiments, the current signal CS2 received by the light-emitting circuit D2 in Figure 2 can be the current signal CS2b, the current signal CS2c or the current signal CS2d in Figure 3B. Similarly, in these embodiments, when the light-emitting circuits D1, D2 are illuminated by a light source with an exposure time of 0 to 1 T seconds or an exposure time much longer than 1 T seconds (such as the observation time of the human eye), the light-emitting circuits D1, D2 emit light. Circuits D1 and D2 have the same brightness. On the other hand, when the light-emitting circuits D1 and D2 are illuminated by the light source with an exposure time of, for example, 0 to 2/3 T seconds, 0 to 1/6 T seconds, 0 to 1/3 T seconds or other periods, the light-emitting circuits D1, D2 D2 may have different brightness.

Please refer to Figure 3C. Figure 3C is a timing diagram of current signals CS1 and CS2 according to some embodiments of the present disclosure. Different from the aforementioned embodiment of Figure 3A, the current signals CS1 and CS2 may also have the timing sequence shown in Figure 3C. As shown in Figure 3C, the period of the current signal CS1 is 1/6 T, and the period of the current signal CS2 is 1/3 T. The periods of the current signals CS1 and CS2 are not the same. In other words, since the frequency is the reciprocal of the period, the current signals CS1 and CS2 have different frequencies.

In the embodiment of Figure 3C, when the light-emitting circuits D1 and D2 are illuminated by the light source with an exposure time of 0 to 1 T seconds, since the integral of the current signals CS1 and CS2 with respect to time is the same, the light-emitting circuits D1 and D2 will have the same brightness. On the other hand, when the light-emitting circuits D1 and D2 are irradiated by the light source with an exposure time of, for example, 0 to 1/6 T seconds, since the integration of the current signals CS1 and CS2 with respect to time is different, the light-emitting circuits D1 and D2 will have Different brightness.

Please refer to Figure 4. FIG. 4 is a schematic diagram of a display device 400 according to some embodiments of the present disclosure. Similar to the display device 100 in FIG. 1 , the display device 400 includes a substrate 120 and a control board 140 disposed outside the substrate 120 . The substrate 120 includes a plurality of general light-emitting areas 122 and a plurality of variable-frequency light-emitting areas 124 . The control board 140 includes a driving circuit. 150. The driving circuit 150 includes a pulse signal generator 152 and a current generator 154.

Different from the display device 100 in FIG. 1 , the substrate 120 of the display device 400 is divided into a plurality of scanning areas S1 - S4 , and each scanning area S1 - S4 includes a plurality of general light-emitting areas 122 and/or a plurality of variable frequency light-emitting areas. 124. In some embodiments, the control board 140 is used to transmit current signals to the scanning areas S1 to S4 at different timings to sequentially drive the scanning areas S1 to S4 to emit light. In other words, the display device 400 sequentially drives the light-emitting circuits in the scanning areas S1 to S4 to emit light.

To keep the diagram simple, the light-emitting circuits provided in the general light-emitting area 122 and the variable frequency light-emitting area 124 of the scanning areas S1 to S4 are not shown in FIG. 4 . In some embodiments, the light-emitting circuits disposed in the general light-emitting area 122 and the variable frequency light-emitting area 124 in Figure 4 are both single light-emitting diodes. In different embodiments, the light-emitting circuits in the general light-emitting area 122 and the variable frequency light-emitting area 124 include multiple light-emitting diodes, multiple transistors, and/or other circuits.

Specifically, the drive circuit 150 in the control board 140 will be connected to the light emitting diodes of each general light-emitting area 122 or variable frequency light-emitting area 124 in the scanning areas S1 to S4 through a plurality of traces (not shown in Figure 4). The anode of the circuit. In other words, the anode of each light-emitting circuit provided in the substrate 120 is connected to the driving circuit 150 through a trace.

On the other hand, each of the scanning areas S1 to S4 only uses one trace to connect the cathodes of all light-emitting circuits in one scanning area to the control board 140 . As shown in Figure 4, the cathodes of all the light-emitting circuits in the scanning area S1 are connected to the control board 140 through the wiring L5, the cathodes of all the light-emitting circuits in the scanning area S2 are connected to the control board 140 through the wiring L6, and the scanning area S3 The cathodes of all the light-emitting circuits in the scanning area S4 are connected to the control board 140 through the wiring L7, and the cathodes of all the light-emitting circuits in the scanning area S4 are connected to the control board 140 through the wiring L8.

In other words, each light-emitting circuit disposed in the general light-emitting area 122 or the multiple variable frequency light-emitting areas 124 in the scanning areas S1 to S4 receives the current signal from the driving circuit 150 from the anode, and its cathode passes through the corresponding one of the scanning area where it is located. Run wires to connect to control board 140. For example, the anode of the light-emitting circuit in the general light-emitting area 122a in the scanning area S3 receives the current signal CS1 from the driving circuit 150 through the wiring L1, and its cathode is connected to the control through the wiring L7 common to all light-emitting circuits in the scanning area S3. Plate 140. For another example, the anode of the light-emitting circuit in the variable frequency light-emitting area 124a in the scanning area S3 receives the current signal CS2 from the driving circuit 150 through the wiring L3, and the cathode is connected to the light-emitting circuit through the wiring L7 common to all light-emitting circuits in the scanning area S3. Control panel 140.

Please refer to Figure 4 and Figure 5A at the same time. FIG. 5A is a timing diagram of current signals received by the general light-emitting area 122 in the scanning areas S1˜S4 according to some embodiments of the present disclosure. In some embodiments, as shown in Figure 5A, the general light-emitting areas 122 of each of the scanning areas S1 to S4 sequentially receive current signals from the driving circuit 150 in the control board 140, and the time length of the current signals is 1 T seconds. And the amplitude is 1 H Ampere. That is, the driving circuit 150 first sends a current signal to the light-emitting circuit of the general light-emitting area 122 in the scanning area S1, and then the driving circuit 150 sends a current signal to the light-emitting circuit of the general light-emitting area 122 of the scanning area S2. The driving circuit 150 then sends a current signal to The light-emitting circuit of the general light-emitting area 122 in the scanning area S3 is scanned, and finally the driving circuit 150 transmits a current signal to the light-emitting circuit of the general light-emitting area 122 of the scanning area S4. After the light-emitting circuits in the scanning areas S1 to S4 have received a current signal once, the driving circuit 150 of the control board 140 will transmit current signals to the scanning areas S1 to S4 sequentially starting from the scanning area S1 again.

Please refer to Figure 4 and Figure 5B at the same time. Figure 5B is a timing diagram of current signals CS1 and CS2 according to some embodiments of the present disclosure. As mentioned above, the current signal CS1 is a current signal received by the light-emitting circuit provided in the general light-emitting area 122a of the display device 400. Accordingly, the current signal CS1 in Figure 5B is the current signal received by the light-emitting circuits of all general light-emitting areas 122 in the scanning area S3, and therefore has the same timing diagram as the current signal received by the scanning area S3 shown in Figure 5A. .

The current signal CS2 is a current signal received by the light-emitting circuit provided in the frequency conversion light-emitting area 124a of the display device 400. As described in other embodiments of the present disclosure, the current signal received by the light-emitting circuit in the variable frequency light-emitting area 124 will have different amplitude, duty cycle and/or frequency from the current signal received by the light-emitting circuit in the general light-emitting area 122 . In the embodiment of Figure 5B, as shown in Figure 5B, the current signal CS1 and the current signal CS2 have different duty cycles and amplitudes. Therefore, when the different light-emitting circuits receiving the current signal CS1 and the current signal CS2 use a relatively short When illuminated by a light source during the exposure time, the two will show different brightness. However, when different light-emitting circuits receiving the current signal CS1 and the current signal CS2 are irradiated by the light source with a relatively long exposure time, since the current signal CS1 and the current signal CS2 have the same or approximately the same current integral with time in a long period of time, Different lighting circuits will display the same or approximately the same brightness.

Please refer to Figure 6. FIG. 6 is a schematic diagram of a display device 600 according to some embodiments of the present disclosure. The display device 600 includes a substrate 120 that includes a plurality of general light-emitting areas 122 , a plurality of variable-frequency light-emitting areas 124 and a plurality of driving circuits 620 . Similar to the embodiments in FIGS. 1 and 4 of the present disclosure, a light-emitting circuit is disposed in each of the general light-emitting area 122 and the variable frequency light-emitting area 124 .

Different from the embodiments in FIGS. 1 and 4 , the display device 600 does not include a control board and a driving circuit arranged outside the substrate 120 , but has a plurality of driving circuits 620 arranged on the substrate 120 . In the embodiment of FIG. 6, a driving circuit 620 is adjacent to four light-emitting areas and is electrically connected to the light-emitting circuits in these light-emitting areas. For example, the driving circuit 620a is adjacent to the general light-emitting areas 122b, 122c and the variable frequency light-emitting areas 124b, 124c. , and is electrically connected to the respective light-emitting circuits of the general light-emitting areas 122b and 122c and the variable frequency light-emitting areas 124b and 124c.

Figure 6 does not show the details of the light-emitting circuit and the driving circuit 620a in the general light-emitting areas 122b, 122c and the variable frequency light-emitting areas 124b, 124c. The details of the light-emitting circuit are explained below with Figure 7.

Please refer to Figure 6 and Figure 7 at the same time. FIG. 7 is a partial schematic diagram of the display device 600 in FIG. 6 according to some embodiments of the present disclosure. FIG. 7 uses the same numbers as in FIG. 6 to represent the same components, and FIG. 7 omits the details of the substrate 120 and other display devices 600 shown in FIG. 6 .

As shown in Figure 7, the light-emitting circuit D3 is arranged in the general light-emitting area 122b, the light-emitting circuit D4 is arranged in the general light-emitting area 122c, the light-emitting circuit D5 is arranged in the variable frequency light-emitting area 124b, and the light-emitting circuit D6 is arranged in the variable frequency light-emitting area 124c. . In some embodiments, each general light-emitting area 122 in the display device 600 in Figure 6 is provided with a light-emitting circuit similar to the light-emitting circuit D3 or the light-emitting circuit D4, and each variable frequency light-emitting area 124 is provided with a light-emitting circuit similar to the D5 or D5 circuit. Light-emitting circuit D6.

In the embodiment of FIG. 7 , each of the light-emitting circuits D3, 4, 5, and 6 is a single light-emitting diode. It should be noted that this embodiment is illustrative only. In different embodiments, the light-emitting circuit disposed in the general light-emitting area 122 and the variable frequency light-emitting area 124 may include a plurality of light-emitting diodes, additional transistors and circuits.

As shown in FIG. 7 , the driving circuit 620a includes a pulse signal generator 622 and a current generator 624.

The pulse signal generator 622 is used to generate a pulse signal and transmit the pulse signal to the current generator 624 that is electrically connected to the pulse signal generator 622 . In some embodiments, the pulse signal generator 622 is used to generate pulse signals with different amplitudes and duty cycles.

The current generator 624 is used to receive the pulse signal from the pulse signal generator 622 and generate a current signal according to the pulse signal. In the embodiment of FIG. 7, the current generator 624 receives a plurality of pulse signals with different amplitudes and duty cycles from the pulse signal generator 622, and then generates pulse signals with different amplitudes and duty cycles based on these pulse signals. The current signals CS3, CS4, CS5, and CS6 are sent to the anodes of the light-emitting circuits D3 to D6 respectively. When the light-emitting circuits D3 ~ D6 receive the current signals CS3 ~ CS6 respectively, the light-emitting circuits D3 ~ D6 are used to emit light.

In some embodiments, the pulse signal generator 622 includes a pulse width modulation circuit and a pulse amplitude modulation circuit (not shown in the figure). The pulse width modulation circuit is used to modulate the duty of different pulse signals. Pulse amplitude modulation circuit is used to modulate the amplitude of different pulse signals.

Please refer to Figure 7 and Figure 8 at the same time. Figure 8 is a timing diagram of current signals CS3-CS6 according to some embodiments of the present disclosure. As shown in Figure 8, in the period of 0 to 1 T seconds, the amplitudes of the current signals CS3 and CS4 are both 1 H, that is, the current signals CS3 and CS4 are 1 H ampere. In the period of 0 to 1/2 T seconds, the amplitudes of the current signals CS5 and CS6 are 2 H, that is, the current signals CS5 and CS6 are 2 H amperes. During the period from 1/2 T seconds to 1 T seconds, the amplitudes of the current signals CS5 and CS6 are 0, that is, the current signals CS5 and CS6 are 0 amperes.

In some embodiments, the periods of the current signals CS3 ~ CS6 are all 2 T seconds, and according to Figure 8, the current signals CS3 ~ CS6 will have different duty cycles. The duty cycle of current signals CS3 and CS4 is 1/2, and the duty cycle of current signals CS5 and CS6 is 1/4.

When the light-emitting circuits D3~D6 respectively receiving the current signals CS3~CS6 are illuminated by the light source with an exposure time of 0~1 T seconds (for example, using a shooting device to photograph the light-emitting circuits D3~D6), because the current signals CS3~CS6 are exposed during such a period With the same current integration over time, the light-emitting circuits D3~D6 will display the same brightness. On the other hand, when the light-emitting circuits D3 to D6 are illuminated by the light source with an exposure time of 0 to 1/2 T seconds or 1/2 T to 1 T seconds, the current signals CS3 to CS6 have different characteristics during such periods. The integration of current over time, the light-emitting circuits D3~D6 will display different brightness. For relevant details, please refer to the description of Figure 3A in the previous paragraph.

Accordingly, the general light-emitting area 122 and the variable-frequency light-emitting area 124 in the display device 600 in Figure 6 may have different brightnesses under a specific exposure time, so the variable-frequency light-emitting area 124 may have lower brightness than the general light-emitting area 122. The "AUO" graphic shown in Figure 6 is formed.

In summary, the display devices 100, 400, and 600 proposed in this disclosure provide current signals with different amplitudes, duty cycles, and/or frequencies to the general light-emitting area 122 and the variable frequency light-emitting area 124, so that when the display device 100 , 400, 600 will display a specific bright pattern when illuminated by a light source with a specific exposure time, which can be used to prevent the screen information displayed by the display device 100, 400, 600 from being stolen by others using a shooting device.

Although the present disclosure has been disclosed in the above embodiments, it is not intended to limit the present invention. Any person skilled in the art may make various modifications and embellishments without departing from the spirit and scope of this disclosure. The scope of protection of this disclosure shall be determined by the scope of the patent application attached.

100:Display device 120:Substrate 122:General luminous area 122a, 122b, 122c: general luminous area 124: Frequency conversion luminous area 124a, 124b, 124c: Frequency conversion light-emitting area 140:Control panel 150:Drive circuit 152:Pulse signal generator 154:Current generator L1,L2,L3,L4,L5,L6,L7,L8: routing D1, D2, D3, D4, D5, D6: light-emitting circuit CS1, CS2, CS3, CS4, CS5, CS6: current signal PS1, PS2: pulse signal M1: Pulse width modulation circuit M2: Pulse amplitude modulation circuit A1,A2,A3,A4,A5,A6,A7,A8,A9,A10: area P1, P2, P3: period CS2a, CS2b, CS2c, CS2d: current signal PD: phase difference 400: Display device S1, S2, S3, S4: scanning area 600: Display device 620: Drive circuit 620a: Drive circuit 622:Pulse signal generator 624:Current generator

Figure 1 is a schematic diagram of a display device 100 according to some embodiments of the present disclosure. Figure 2 is a partial schematic diagram of the display device in Figure 1 according to some embodiments of the present disclosure. Figure 3A is a timing diagram of current signals according to some embodiments of the present disclosure. Figure 3B is a timing diagram of current signals according to some embodiments of the present disclosure. Figure 3C is a timing diagram of current signals according to some embodiments of the present disclosure. Figure 4 is a schematic diagram of a display device according to some embodiments of the present disclosure. Figure 5A is a timing diagram of current signals received by the general light-emitting area in the scanning area according to some embodiments of the present disclosure. Figure 5B is a timing diagram of current signals according to some embodiments of the present disclosure. Figure 6 is a schematic diagram of a display device according to some embodiments of the present disclosure. FIG. 7 is a partial schematic diagram of the display device in FIG. 6 according to some embodiments of the present disclosure. Figure 8 is a timing diagram of current signals according to some embodiments of the present disclosure.

100:Display device

120:Substrate

122:General luminous area

122a: General luminous area

124: Frequency conversion luminous area

124a: Frequency conversion luminous area

140:Control panel

150:Drive circuit

152:Pulse signal generator

154:Current generator

L1,L2,L3,L4: routing

Claims (8)

A display device includes: a plurality of first light-emitting circuits and a plurality of second light-emitting circuits, arranged on a substrate; and a driving circuit, arranged outside the substrate and used to generate a first current signal and a second current signals, the first current signal and the second current signal have different amplitudes and duty cycles; wherein, the driving circuit is used to transmit the first current signal to at least one of the first light-emitting circuits, and transmit The second current signal is sent to at least one of the second light-emitting circuits, and the at least one of the first light-emitting circuits and the at least one of the second light-emitting circuits are used to respectively receive the first The current signal and the second current signal emit light together; wherein: when the at least one of the first light-emitting circuits and the at least one of the second light-emitting circuits are illuminated by the light source for a first exposure time, The at least one of the first light-emitting circuits and the at least one of the second light-emitting circuits have different brightnesses; when the at least one of the first light-emitting circuits and the second light-emitting circuits When the at least one of the first light-emitting circuits is illuminated by the light source with a second exposure time, the at least one of the first light-emitting circuits and the at least one of the second light-emitting circuits have the same brightness; the second The exposure time is greater than the first exposure time. The display device of claim 1, wherein the driving circuit includes: a pulse signal generator for generating a first pulse signal and a second pulse signal, the first pulse signal and the second pulse signal having different characteristics. The amplitude and duty cycle; and a current generator for generating the first current signal according to the first pulse signal, and generating the second current signal according to the second pulse signal. The display device of claim 1, wherein: within a first period of time, the integral of the current with respect to time of the first current signal is different from the integral of the current with time of the second current signal; within a second period of time , the integral of the current over time of the first current signal is the same as the integral of the current over time of the second current signal; the second period is greater than the first period. The display device of claim 1, wherein: the first light-emitting circuits are provided in a plurality of first light-emitting areas of the substrate, and the second light-emitting circuits are provided in a plurality of second light-emitting areas of the substrate. ; When the at least one of the first light-emitting circuits and the at least one of the second light-emitting circuits are irradiated by the light source with an exposure time, the second light-emitting areas are used to form a light source on the substrate. graphics. The display device as claimed in claim 1, wherein: The first current signal and the second current signal have different frequencies. The display device of claim 1, wherein the first current signal and the second current signal have a phase difference. The display device of claim 2, wherein the pulse signal generator includes: a pulse width modulation circuit for modulating the duty cycle of the first pulse signal and the second pulse signal; and a pulse width. A modulation circuit is connected to the pulse width modulation circuit and used to modulate the amplitude of the first pulse signal and the second pulse signal. A display device includes: a plurality of first light-emitting circuits and a plurality of second light-emitting circuits, arranged on a substrate; and a plurality of driving circuits, arranged on the substrate and electrically connected to at least one of the first light-emitting circuits. One and at least one of the second light-emitting circuits. Each of the driving circuits includes: a pulse signal generator for generating a first pulse signal and a second pulse signal, wherein the first The pulse signal and the second pulse signal have different amplitudes and duty cycles; and a current generator is used to generate a first current signal according to the first pulse signal and a second current according to the second pulse signal. signal, wherein the first current signal and the second current signal have different amplitudes and a duty cycle; wherein: the driving circuits are used to transmit the first current signal to at least one of the first light-emitting circuits, and transmit the second current signal to the second light-emitting circuits. At least one; when the at least one of the first light-emitting circuits and the at least one of the second light-emitting circuits receive the first current signal and the second current signal respectively, the first light-emitting circuits The at least one of the circuits and the at least one of the second light-emitting circuits are used to emit light; when the at least one of the first light-emitting circuits and the at least one of the second light-emitting circuits When illuminated by the light source with a first exposure time, the at least one of the first light-emitting circuits and the at least one of the second light-emitting circuits have different brightness; when the at least one of the first light-emitting circuits When the at least one of the first light-emitting circuits and the at least one of the second light-emitting circuits are illuminated by the light source with a second exposure time, the at least one of the first light-emitting circuits and the at least one of the second light-emitting circuits At least one of them has the same brightness; the second exposure time is greater than the first exposure time.

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