Electronic device

Abstract

This invention relates to an electronic device comprising: a display unit, a display driving circuit, and a circuit element. The display driving circuit is coupled to the display unit and is capable of driving the display unit to display an image at several refresh rate modes, including a first refresh rate and a second refresh rate. The circuit element is disposed under a display area of ​​the display unit, coupled to the display driving circuit, and receives a dynamic update signal generated by the display driving circuit, the dynamic update signal including several start pulses and several delay pulses. This solves the problem in the prior art where interference between display pixels and under-display circuit elements cannot be reliably avoided when the screen refresh rate changes.

Description

Technical Field

[0001] The present invention relates to an electronic device, in particular to an electronic device in which circuit elements are arranged under a screen. Prior Art

[0002] In today's consumer electronics (such as smartphones and tablets), manufacturers are striving to maximize screen size by moving circuit components previously located within the screen's bezel to the underside of the display area. This reduces the area previously occupied by these components and further reduces the bezel's size. This allows electronic products to have larger screens within a given form factor, achieving a better screen-to-body ratio. Currently, components that can be relocated to the underside of the screen include the camera lens, fingerprint sensor, and various optical sensors.

[0003] However, the display pixels and the underlying circuitry can interact with each other. For example, the under-display lens may receive light from the display pixels, causing image distortion. Conversely, when circuitry with light emitters (such as proximity sensors, time-of-flight range finders, and dot projectors) is located beneath the display, the invisible light it emits can still affect the image, easily causing bright spots on the screen. Manufacturers have proposed various technical solutions to address this interference between display pixels and under-display circuitry, including solutions that disable under-display circuitry when display pixels are emitting light, and solutions that disable display pixels when under-display circuitry is activating.

[0004] As display technology advances toward higher screen resolutions and higher refresh rates, along with improvements in system computing and communication performance, the power consumption of electronic devices increases. Given limited battery capacity, some industry players have proposed dynamically adjusting the refresh rate to reduce overall power consumption. For example, the refresh rate can be controlled to 120Hz or higher for gaming, 60Hz for video playback, and 1Hz to 30Hz for static images.

[0005] Fluctuations in the screen's refresh rate make it difficult for electronic devices to accurately determine when display pixels should illuminate relative to their underlying circuitry. This renders many existing solutions for preventing interference between display pixels and underlying circuitry ineffective. One existing approach involves providing the display panel's refresh rate information to the underlying circuitry via an additional pin, but this approach significantly increases overall system cost.

[0006] On the other hand, the applicant previously filed Taiwan Patent Application No. TW202331681, which describes a method of integrating the refresh rate information of the display panel into a dynamic update signal generated by the display driver circuit, and then decoding the refresh rate information by the circuit elements under the screen and controlling the operation of the circuit elements based on the refresh rate information. The applicant has now proposed further improvements to this technology. Summary of the Invention

[0007] One purpose of the present invention is to provide an electronic device that allows an under-screen circuit element to receive a dynamic update signal generated by a display driver circuit. The dynamic update signal includes several start pulses and several delay pulses. When the circuit element is controlled by the dynamic update signal, the actuation of the control element can be coordinated with the display driver circuit to effectively avoid interference between the display pixels and the under-screen circuit element, thereby solving the problem of failure of the prior art when the screen refresh rate changes.

[0008] The present invention discloses an electronic device comprising a display unit, a display driver circuit, and a circuit element. The display driver circuit is coupled to the display unit and is capable of driving the display unit to display an image at a plurality of refresh rate modes, including a first refresh rate and a second refresh rate. The circuit element is disposed below a display area of ​​the display unit and is coupled to the display driver circuit. The circuit element receives a dynamic update signal generated by the display driver circuit. The dynamic update signal comprises a plurality of start pulses and a plurality of delay pulses. In the dynamic update signal, the start pulse represents the time point at which the display driver circuit controls the refresh of the display unit; the delay pulses comprise a first delay pulse corresponding to the first refresh rate and a second delay pulse corresponding to the second refresh rate. Simple diagram description

[0009] Figure 1: It is a schematic structural diagram of an electronic device according to an embodiment of the present invention; Figure 2: It is a schematic diagram of a dynamic update signal of an electronic device of a preferred embodiment of the present invention; FIG3 is a schematic diagram showing the structure of a circuit element of an electronic device according to an embodiment of the present invention; FIG4 is a schematic diagram illustrating a variation of the dynamic update signal of the electronic device embodiment of the present invention; and Figure 5 is a schematic diagram of another variation of the implementation of the dynamic update signal of the electronic device embodiment of the present invention. Implementation Method

[0010] To help you, the review committee, gain a deeper understanding of the features and effects of the present invention, we would like to provide examples and accompanying explanations as follows:

[0011] Certain terms are used throughout the specification and claims to refer to specific components. However, those skilled in the art will understand that different terms may be used to refer to the same component. Furthermore, this specification and claims do not distinguish components based on differences in name, but rather on differences in the overall technology used. Throughout the specification and claims, the terms "including," "having," and "having" are open-ended and should be interpreted as meaning "including, but not limited to." Furthermore, the term "coupled" encompasses both direct and indirect connection methods. Therefore, if a first device is described as being coupled to a second device, this means that the first device can be directly connected to the second device or indirectly connected to the second device through another device or other means, enabling signal transmission between the first and second devices.

[0012] The following further describes the characteristics and structures of the electronic device and its circuit elements disclosed in the present invention using different embodiments:

[0013] First, please refer to Figure 1, which is a schematic diagram of the structure of an embodiment of an electronic device according to the present invention. As shown, the electronic device 1 according to the present invention includes a display driver circuit 12, a circuit element 14, and a display unit 16. In this embodiment, the circuit element 14 includes a light-emitting unit 142, a sensor unit 144, and a control circuit 146. The control circuit 146 is coupled to the light-emitting unit 142 and the sensor unit 144, respectively. The display unit 16 can include a display panel such as a liquid crystal display (LCD) or an organic light-emitting diode (OLED) display. The display unit 16 can also generally integrate a touch circuit to provide touch functionality. The light-emitting unit 142 and the sensor unit 144 included in the circuit element 14 are disposed below a display area A of the display unit 16. Therefore, the circuit element 14 of this embodiment is an under-screen design. In this embodiment, the light-emitting unit 142 and the sensor unit 144 can be integrated with the control circuit 146 into an integrated circuit chip. However, the present invention is not limited thereto. The light-emitting unit 142 and the sensor unit 144 can be disposed at different locations below the display area A and coupled to the control circuit 146. The display area A refers to the area of ​​the display unit 16 that has effective display pixels and can be used to display images, and is not blocked by the frame area B of the electronic device.

[0014] This embodiment uses a circuit element 14 comprising a light-emitting unit 142, a sensing unit 144, and a control circuit 146 as an example. These circuit elements 14 can be used to form various sensing devices, such as proximity sensors, time-of-flight sensors, and dot projectors. However, these circuit elements 14 are used for illustration because the light-emitting unit 142 they contain may affect screen imaging, making it crucial to prevent interference between the display pixels of the display unit 16 and the light-emitting unit 142. Compared to circuit elements such as lenses, fingerprint sensors, and ambient light sensors, which are typically only unilaterally affected by screen illumination, using these circuit elements 14 makes it easier to fully explain the various technical effects brought about by the improvements of the present invention.

[0015] Continuing with the above, the circuit element 14 of this embodiment is further coupled to a display driver circuit 12, which is in turn coupled to the display unit 16. Specifically, the display driver circuit 12 can be coupled to the control circuit 146 of the circuit element 14 via a transmission unit 202, which can be a flat cable or other electrical connection structure. The transmission unit 202 and the circuit element 14 can be disposed on a substrate 20, which can be a motherboard of an electronic product such as a mobile phone, but the present invention is not limited thereto. The display driver circuit 12 is generally composed of one or more independent integrated circuit chips, responsible for controlling the drive timing, drive voltage, and display data access of the display unit 16, thereby correctly driving the display unit 16 to display an image.

[0016] The display driver circuit 12 generates a dynamic refresh signal SS, which may include information about the refresh rate (i.e., refresh frequency) of the display unit 16. In this embodiment, the display driver circuit 12 outputs the dynamic refresh signal SS to the control circuit 146 of the circuit element 14. It is worth noting that in actual commercially available products, the display driver circuit 12 and the circuit element 14 are often designed and manufactured by different manufacturers. Therefore, if the technology of the present invention is to achieve high market acceptance, it is necessary to reduce the design difficulty of both the display driver circuit 12 and the circuit element 14.

[0017] To this end, this embodiment employs a technical solution for the display driver circuit 12 that easily integrates the refresh rate of the display unit 16 into the dynamic update signal SS. For details, please refer to the signal diagram shown in FIG2 . S1 is a display data synchronization signal (hereinafter referred to as the data synchronization signal), such as a vertical synchronization signal. Assuming that the display driver circuit 12 is located in an environment where the display data is updated at a fixed frequency of 120 Hz per frame, the frequency of the data synchronization signal S1 can be fixed at 120 Hz. However, to provide the function of dynamically adjusting the frame refresh rate of the display unit 16, the synchronization signal S2 (hereinafter referred to as the display synchronization signal) used for display control in the display driver circuit 12 is not fixed at 120 Hz. For example, as shown in the figure, it includes three modes: 120 Hz, 60 Hz, and 30 Hz. The display synchronization signal S2 can be a tearing effect (TE) signal, a scan line synchronization signal, or other synchronization signal used for display control. It should be noted that the three modes of 120 Hz, 60 Hz and 30 Hz are merely examples given for the purpose of illustration of the present invention and the present invention is not limited thereto.

[0018] The dynamic update signal SS includes several start pulses P and several delay pulses D1 and D2. The start pulse P represents the point in time when the display driver circuit 12 actually controls the display unit 16 to begin refreshing and can be synchronized with the display synchronization signal S2. Delay pulses D1 and D2 are inserted at the point in time when the display driver circuit 12 controls the display unit 16 to pause refreshing in order to reduce the refresh rate. When the display synchronization signal S2 is 120 Hz, the dynamic update signal SS may not include a delay pulse. When the display synchronization signal S2 is 60 Hz, the dynamic update signal SS may include a shorter first delay pulse D1 in the second half. When the display synchronization signal S2 is 30 Hz, the dynamic update signal SS may include a longer second delay pulse D2 in the last three-quarters.

[0019] Through the above preferred embodiments of the present invention, the technical effect of reducing the design difficulty of both the display driving circuit 12 and the circuit element 14 can be achieved, as described in detail below:

[0020] For the display driver circuit 12, the data synchronization signal S1, display synchronization signal S2, and the refresh rate information of the display unit 16 are all existing signals. Therefore, it is easy to infer the timing at which the display driver circuit 12 controls the display unit 16 to pause updating in order to reduce the refresh rate. This allows the display driver circuit 12 to generate the dynamic update signal SS with the inserted delayed pulses D1 and D2, without requiring any special signal processing. Furthermore, the delayed pulses D1 and D2 do not require additional circuitry to generate. For example, a system typically has a clock signal C with a higher frequency (e.g., 360 Hz), so the display driver circuit 12 can directly use segments of the existing clock signal C as the delayed pulses D1 and D2. In other words, the display driver circuit 12 can generate the dynamic update signal SS required by the preferred embodiment of the present invention through a simple design.

[0021] On the other hand, after receiving the dynamic update signal SS, circuit element 14 does not need to decode the dynamic update signal SS to control the operation of other components and coordinate with the display driver circuit 12. Specifically, referring to Figures 1 and 2, since circuit element 14 is fixed in position within electronic device 1, when light-emitting unit 142 is positioned below display unit 16, the sensing light R1 it emits will only affect one or several rows of display pixels within a local display area on display unit 16. Therefore, by simply controlling light-emitting unit 142 to operate at a specific time, the light-emitting time of the display pixels in local display area A1 can be avoided, thereby preventing interference with display unit 16 and preventing the formation of bright spots or flickering. For example, if it is desired to control the light-emitting unit 142 to be activated only after the local display area A1 is enabled, under the condition of a refresh rate of 120 Hz, it is only necessary to use the position of the starting pulse P in the dynamic update signal SS as a reference to calculate a preset duration, and repeatedly activate the light-emitting unit 142 at the same 120 Hz frequency to control the light-emitting unit 142 to be activated at the appropriate time point.

[0022] When the refresh rate of the display unit 16 is dynamically adjusted, for example, to 60 Hz, if no processing is performed, the light-emitting unit 142 will be activated twice during a single display update, potentially affecting screen imaging. However, because the dynamic update signal SS is inserted with a shorter first delay pulse D1 when the refresh rate is adjusted to 60 Hz, this first delay pulse D1 can be used to prevent the light-emitting unit 142 from activating at the originally scheduled time T (the dotted box in FIG. 2 indicates that the original activation of the light-emitting unit 142 has been stopped), thereby ensuring that the circuit element 14 does not activate twice during a single display update when controlled by the dynamic update signal SS. Similarly, if the refresh rate of the display unit 16 is adjusted to 30 Hz, if no processing is performed, the light-emitting unit 142 will be activated four times in a single display update. However, because the dynamic update signal SS is inserted with a longer second delay pulse D2 at this time, it is ensured that the circuit element 14 will not be activated four times in a single display update when controlled by the dynamic update signal SS.

[0023] It should be noted that, when the circuit element 14 is controlled by the dynamic update signal SS, it is not necessary to decode the dynamic update signal SS to determine the current refresh rate of the display unit 16 in order to control the operation of the light-emitting unit 142 in coordination with the display driver circuit 12. This greatly simplifies the design of the circuit element 14 and significantly reduces control delay, making the present invention particularly suitable for applications in products where the screen refresh rate needs to be continuously changed.

[0024] As described above, in this embodiment, the circuit element 14 includes a light-emitting unit 142, allowing the circuit element 14 to be used to form various sensing devices, such as distance sensors, time-of-flight sensors, and dot projectors. The following uses a distance sensor as an example to illustrate the operation of the circuit element 14 after receiving the dynamic update signal SS. As shown in FIG3 , the circuit element 14 may include a light drive signal LD ​​and a sensing drive signal SD. The control circuit 146 receives the dynamic update signal SS and controls the operation of the light-emitting unit 142 based on the dynamic update signal SS. When the light-emitting unit 142 needs to be activated, the control circuit 146 generates the light drive signal LD ​​and transmits it to the light-emitting unit 142, driving the light-emitting unit 142 to emit a sensing light R1. Simultaneously, in this embodiment, the control circuit 146 further generates the sensing drive signal SD and transmits it to the sensing unit 144, driving the sensing unit 144 to sense a reflected light R2 of the sensing light R1. Furthermore, in some embodiments of the present invention, the sensing unit 144 continuously senses light without stopping, so the control circuit 146 can only use the light driving signal LD ​​to drive the light-emitting unit 142. The light-emitting unit 142 can be a light-emitting diode (LED) or a laser diode (LD). In general distance sensing operations, the sensing light R1 is mainly invisible light such as infrared light.

[0025] In addition, as shown in FIG. 1 , the circuit element 14 transmits a sensing signal DS generated by the sensing unit 144 to a processing unit 22 on the substrate 20. The processing unit 22 can determine whether the display unit 16 is close to an object or a human body based on the sensing signal DS provided by the sensing unit 144, and further determine whether to disable the touch function and display function of the display unit 16.

[0026] Through the above-described embodiment of the present invention, the circuit element 14 can cooperate with the display driver circuit 12, so that regardless of the current refresh rate of the display unit 16, the circuit element 14 can control the light-emitting unit 142 to actuate a preset number of times in a single display update, thereby preventing the sensing light R1 of the light-emitting unit 142 from interfering with the normal display color of the display pixel, ensuring that the display unit 16 is unlikely to form bright spots or flicker.

[0027] The following describes various variations of the above preferred embodiments of the present invention:

[0028] Continuing with FIG. 2 , those skilled in the art, based on the teachings of the present invention, may attempt to combine the aforementioned delayed pulses D1 and D2 with the immediately following start pulse P into a single pulse, thereby forming another form of dynamic update signal SS. This can further simplify the design of both the driver circuit 12 and the circuit element 14. However, the single pulse still essentially consists of the delayed pulses D1 and D2, which are inserted at the point where the display driver circuit 12 controls the display unit 16 to pause updating in order to reduce the refresh rate, and the subsequent start pulse P, thus remaining within the scope of the present invention.

[0029] Although in the aforementioned embodiment, when the circuit element 14 is controlled by the dynamic update signal SS, it is not necessary to decode the dynamic update signal SS to confirm the current update rate of the display unit 16, and the operation of the light-emitting unit 142 can be controlled to cooperate with the display driving circuit 12. However, as shown in FIG. 4 , those skilled in the art who are willing to incur the circuit cost of decoding the dynamic update signal SS and tolerate the drawback of a control delay can still refer to the technical content disclosed in the applicant's previous Taiwan Patent Application No. TW202331681. By decoding the dynamic update signal SS (for example, determining that no delayed pulse is inserted, indicating 120 Hz; determining that the shorter first delayed pulse D1 is inserted, indicating 60 Hz; or determining that the longer second delayed pulse D2 is inserted, indicating 30 Hz), they can determine the current refresh rate of the display unit 16. Based on this real-time refresh rate information, they can calculate a specific time period from the position of the starting pulse P in the dynamic update signal SS as a reference to determine the optimal time point T' for controlling the activation of the light-emitting unit 142 under various modes, such as 120 Hz, 60 Hz, and 30 Hz. Although the applicant has also marked the same time points T' in the display synchronization signal S2, those skilled in the art will understand that if the display synchronization signal S2 is set to control the operation of the light-emitting unit 142 at these time points T', it is necessary to obtain the refresh rate information of the display panel and perform corresponding signal processing.

[0030] It is worth noting that even in the variation shown in FIG. 4 , the display driver circuit 12 still has the advantage of being able to generate the dynamic update signal SS with the inserted delayed pulses D1 and D2 without having to perform special signal processing. This allows the display driver circuit 12 to generate the dynamic update signal SS required by the above-mentioned variation implementation of the present invention through a simple design.

[0031] Furthermore, while the aforementioned embodiments and variations all insert delayed pulses D1 and D2 at the point where the display driver circuit 12 controls the display unit 16 to pause updating in order to reduce the refresh rate, those skilled in the art may, based on the teachings of the present invention, attempt to employ other simple variations to generate different forms of dynamic update signals SS, thereby achieving the same or similar technical effects. For example, referring to FIG. 5 , those skilled in the art may attempt to insert delayed pulses D1 and D2 adjacent to the start pulse P. While this approach may require additional signal processing steps for the display driver circuit 12 and incur costs, the dynamic update signal SS generated by inserting different delayed pulses D1 and D2 adjacent to the start pulse P can still timely control the circuit element 14. Regardless of whether the dynamic update signal SS update rate is adjusted to 60 Hz or 30 Hz, it effectively prevents the light-emitting unit 142 from activating at the wrong time, ensuring that the light-emitting unit 142 only activates a predetermined number of times during a single display update. Furthermore, in a circuit system with a slower processing speed, the above-mentioned variation can provide more time for the circuit element 14 to effectively prevent the light-emitting unit 142 from operating at an incorrect time point.

[0032] The difference between the delayed pulses D1 and D2 may refer to the difference in the number of pulses (for example, the delayed pulses D1 and D2 shown in FIG5 have 1 and 2 pulses respectively) or the difference in the pulse duration, but the present invention is not limited thereto.

[0033] As mentioned above, in other embodiments of the present invention, the circuit element 14 may also be a lens (image sensor), a fingerprint sensor, or other various application components. However, even if the circuit element 14 does not have the light-emitting unit 142, the dynamic update signal SS can still be used to determine the current refresh rate of the display unit 16, thereby causing the circuit element 14 to correspond to or avoid the display pixel light-emitting time of the display unit 16.

[0034] To highlight the outstanding effects of various embodiments of the present invention, the following example illustrates how a commercially available product dynamically adjusts its refresh rate. To avoid noticeable flicker during the refresh rate adjustment process, products advertised as adaptive typically employ a gradual, adaptive adjustment between the initial refresh rate and the target refresh rate. For example, if the refresh rate of display unit 16 needs to be reduced from 120Hz to 1Hz, the display unit 16 might be gradually adjusted in a very short period of time, sequentially from 120Hz to 90Hz, 60Hz, 30Hz, and finally 1Hz. In this case, if the preferred embodiment of the present invention is used, the display driver circuit 12 outputs the dynamic update signal SS to the circuit element 14. The circuit element 14 does not decode the dynamic update signal SS to determine the current refresh rate of the display unit 16, but directly uses it to control the actuation of a component (e.g., the light-emitting unit 142) in coordination with the display driver circuit 12. This significantly reduces control delay, allowing the circuit element 14 to instantly adapt to the current image refresh rate even when the refresh rate changes within a very short period of time, ensuring that it actuates at the appropriate time.

[0035] In summary, the present invention provides an electronic device that, by allowing an under-display circuit element to receive a dynamic update signal generated by a display driver circuit, comprising a plurality of start pulses and a plurality of delay pulses, controls the circuit element's operation in coordination with the display driver circuit when controlled by the dynamic update signal, thereby effectively preventing interference between display pixels and the under-display circuit element. In particular, when the under-display circuit element includes a light-emitting unit, this prevents the light emitted by the light-emitting unit from interfering with the normal display color of the display pixels, thereby minimizing the risk of bright spots or flickering on the display panel.

[0036] Furthermore, the display driver circuit of the present invention can generate the dynamic update signal required by the present invention through a simple design, and can also simplify the design difficulty of circuit components and even reduce the control delay of the circuit, which can effectively avoid mutual interference between display pixels and circuit components under the screen.

[0037] Therefore, this invention is novel, progressive and can be used in industry. It should undoubtedly meet the patent application requirements of my country's Patent Law. Therefore, I have filed an invention patent application in accordance with the law and pray that the patent office will be approved as soon as possible. I am deeply grateful.

[0038] However, the above is only a preferred embodiment of the present invention and is not intended to limit the scope of implementation of the present invention. All equivalent changes and modifications based on the shape, structure, characteristics and spirit described in the scope of the patent application of the present invention should be included in the scope of the patent application of the present invention.

[0039] 1: Electronic devices 12: Display driver circuit 14: Circuit components 142: Light-emitting unit 144: Sensing unit 146: Control circuit 16: Display unit 20:Substrate 202: Transmission unit 22: Processing unit A: Display area A1: Partial display area B: Border area SS: Dynamic update signal DS:Sensor signal R1: Senses light R2: reflected light LD: Light drive signal SD: Sense drive signal S1: Data synchronization signal S2: Display synchronization signal SS: Dynamic update signal SS': Dynamic update signal P: Starting pulse D1: First delayed pulse D2: Second delayed pulse T: Time T': time point

Claims

1. An electronic device, comprising: a display unit; a display driving circuit coupled to the display unit, the display driving circuit being capable of driving the display unit to display an image at a plurality of refresh rate modes, the plurality of refresh rate modes including a first refresh rate and a second refresh rate; a circuit element disposed under a display area of ​​the display unit, the circuit element being coupled to the display driving circuit and receiving a dynamic update signal generated by the display driving circuit, the dynamic update signal including a plurality of start pulses and a plurality of delay pulses; wherein, In this dynamic update signal, the starting pulse represents the point in time when the display driving circuit controls the display unit to refresh; the delay pulse includes a first delay pulse corresponding to the first update rate and a second delay pulse corresponding to the second update rate.

2. The electronic device as described in claim 1, wherein, At the first update rate, the first delayed pulse is inserted between two adjacent starting pulses, and the display driving circuit controls the display unit to pause updating at the same time. At the second update rate, the second delayed pulse is inserted between two adjacent starting pulses, and the display driving circuit controls the display unit to pause updating at the same time.

3. The electronic device as described in claim 2, wherein, The plurality of update rate modes include a third update rate, which is higher than the first update rate and the second update rate, and below the third update rate, no delayed pulse is inserted between two adjacent start pulses.

4. The electronic device as described in claim 3, wherein, At this third update rate, the dynamic update signal controls the circuit element to operate repeatedly at the frequency of the third update rate.

5. The electronic device as described in claim 4, wherein, At the first update rate, the first delayed pulse is used to prevent the circuit element from operating at one point in time; at the second update rate, the first delayed pulse is used to prevent the circuit element from operating at several points in time.

6. The electronic device as described in claim 1, wherein, The dynamic update signal contains update rate information of the display unit. When the circuit element is controlled by the dynamic update signal, it does not decode the dynamic update signal to obtain the update rate information.

7. The electronic device as described in claim 2, wherein, The first delayed pulse and the second delayed pulse are formed by the display driving circuit using a segment of a clock signal, the frequency of which is greater than the first update rate and the second update rate.

8. The electronic device as described in claim 2, wherein, The first delayed pulse wave merges with an adjacent starting pulse wave to form a single pulse wave; the second delayed pulse wave merges with another adjacent starting pulse wave to form a single pulse wave.

9. The electronic device as described in claim 1, wherein, The dynamic update signal contains update rate information of the display unit. When the circuit element is controlled by the dynamic update signal, it decodes the dynamic update signal to obtain the update rate information.

10. The electronic device as described in claim 1, wherein, At the first update rate, the first delayed pulse is inserted at a position adjacent to a starting pulse; at the second update rate, the second delayed pulse is inserted at a position adjacent to another starting pulse.

11. The electronic device as described in claim 10, wherein, The first delayed pulse and the second delayed pulse are formed by the display driving circuit using a segment of a clock signal, the frequency of which is greater than the first update rate and the second update rate.

12. The electronic device as described in claim 11, wherein, The number of pulses in the clock signal contained in the first delayed pulse wave is different from that in the second delayed pulse wave.

13. The electronic device as described in claim 1, wherein, The circuit element includes a light-emitting unit, which controls the operation of the light-emitting unit according to the dynamic update signal.

14. The electronic device as described in claim 13, wherein, The light-emitting unit is a light-emitting diode or a laser diode.

15. The electronic device as described in claim 13, wherein, The circuit element further includes a sensing unit and a control circuit. The control circuit generates a light driving signal to the light-emitting unit and a sensing driving signal to the sensing unit according to the dynamic update signal. The light-emitting unit generates a light source according to the light driving signal. The sensing unit receives a reflected light corresponding to the light source according to the sensing driving signal to generate a corresponding sensing signal.

16. The electronic device as described in claim 13, wherein, The circuit element operates according to the dynamic update signal to prevent the light emitted by the light-emitting unit from interfering with the normal display of the display unit.

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