Transparent display and control method thereof

Abstract

The invention discloses a transparent display which comprises a plurality of pixels. Each pixel comprises at least one sub-pixel. Each sub-pixel comprises an electrode group, a polymer dispersed liquid crystal (PDLC) layer, a light-emitting part, a light-emitting control circuit, a judgment circuit and a light-transmitting driving circuit. The electrode group includes a first electrode and a second electrode between which a control voltage is provided. The PDLC layer is located between the first electrode and the second electrode so as to be in a scattering state or a penetrating state according to the control voltage. The light-emitting part is located in the PDLC layer, receives the bias voltage and is in a light-emitting state or a non-light-emitting state according to the bias voltage. The light-emitting control circuit is electrically connected to the light-emitting member and outputs a bias voltage to the light-emitting member. The judgment circuit is electrically connected to the light-emitting control circuit and outputs a driving signal according to the bias voltage. The light-transmitting driving circuit is electrically connected to the judgment circuit and the electrode group and generates a control voltage to the electrode group according to the driving signal.

Description

Technical Field

[0001] This invention relates to a transparent display, and more particularly to a transparent display capable of controlling the light transmission state when it is not emitting light. Background Technology

[0002] To achieve a light-transmitting effect, transparent displays typically utilize organic light-emitting diodes (OLEDs) or micro LEDs, liquid crystals, and a transparent substrate, allowing them to display images from both front and rear viewing angles. However, traditional transparent displays cannot display black pixels. Consequently, traditional transparent displays have a low native contrast ratio (NCR) and are prone to reflecting ambient light, affecting image quality; that is, they have a low ambient contrast ratio (ACR). Summary of the Invention

[0003] To address these issues, one known solution is to use polarizing films on both the front and back of a transparent display to achieve a black effect. However, this solution suffers from low transmittance and low contrast, resulting in a reduction of screen brightness by at least half.

[0004] Another solution known to the inventors comprises a lower substrate, a micro LED layer, a lower electrode layer, a polymer-dispersed liquid crystal (PDLC) layer, an upper electrode layer, and an upper substrate. The PDLC's liquid crystal alignment can be controlled by voltage, thereby controlling its light transmittance. Thus, light does not need to be controlled by a polarizer. However, this solution has the disadvantage of being relatively thick.

[0005] In some embodiments, a transparent display includes a plurality of pixels. Each pixel includes at least one sub-pixel. Each sub-pixel includes an electrode group, a PDLC layer, a light-emitting element, a light-emitting control circuit, a judgment circuit, and a light-transmitting drive circuit. The electrode group includes a first electrode and a second electrode. A control voltage is provided between the first electrode and the second electrode. The PDLC layer is located between the first electrode and the second electrode and is in a scattering state or a transmitting state according to the control voltage. The light-emitting element is located in the PDLC layer and receives a bias voltage and is in a light-emitting state or a non-light-emitting state according to the bias voltage. The light-emitting control circuit is electrically connected to the light-emitting element and configured to output a bias voltage to the light-emitting element. The judgment circuit is electrically connected to the light-emitting control circuit and configured to output a drive signal according to the bias voltage. The light-transmitting drive circuit is electrically connected to the judgment circuit and the electrode group and configured to generate a control voltage to the electrode group according to the drive signal.

[0006] In some embodiments, a method for controlling a transparent display includes: outputting a bias voltage to a light-emitting element to control the light-emitting element to be in a light-emitting state or a non-light-emitting state; generating a drive signal based on the bias voltage of the light-emitting element; and driving an electrode group to generate a control voltage based on the drive signal to control the PDLC layer.

[0007] As described above, in some embodiments of the transparent display, the light-emitting element is placed in the PDLC layer, thus enabling simultaneous control of the liquid crystal alignment state and a thinner thickness. Furthermore, the liquid crystal alignment state of the PDLC layer can be controlled by the bias voltage of the light-emitting element, resulting in a more streamlined control circuit architecture. Attached Figure Description

[0008] Figure 1 These are block diagrams of transparent displays according to some embodiments;

[0009] Figure 2 These are cross-sectional schematic diagrams of pixels in some embodiments;

[0010] Figure 3 These are schematic diagrams of control circuits in some embodiments;

[0011] Figure 4 This is a state table of some parameters in some embodiments;

[0012] Figure 5 These are schematic diagrams of control circuits in some embodiments;

[0013] Figure 6 This is a state table of some parameters in some embodiments;

[0014] Figure 7 These are flowcharts of control methods for transparent displays according to some embodiments;

[0015] Figure 8 This is a partial flowchart of a control method for a transparent display according to some embodiments;

[0016] Figure 9 This is a partial flowchart of a control method for a transparent display according to some embodiments;

[0017] Figure 10 These are partial flowcharts of control methods for transparent displays according to some embodiments; and

[0018] Figure 11 This is a partial flowchart of a control method for a transparent display according to some embodiments.

[0019] In the attached figures, the following labels are used:

[0020] 100: Transparent Display

[0021] 110: First light-transmitting layer

[0022] 120: Second light-transmitting layer

[0023] 200 pixels

[0024] 300: Subpixel

[0025] 310: PDLC layer

[0026] 320: Electrode assembly

[0027] 321: First electrode

[0028] 322: Second electrode

[0029] 330: Light-emitting components

[0030] 340: Control Circuit

[0031] 341: Comparator

[0032] 400: Input Interface

[0033] 500: Light sensing module

[0034] 600: Light-emitting control circuit

[0035] 700: Judgment Circuit

[0036] 800: Light transmission drive circuit

[0037] C: Capacitor

[0038] S: Drive signal

[0039] S101~S103, S201~S203, S301~S303: Steps

[0040] S SCAN Scan signal

[0041] T1: Light-emitting element drive switch

[0042] T2: PDLC drive switch

[0043] T SCAN Scan switch

[0044] V: Bias voltage

[0045] V CC PDLC power supply

[0046] V DATA Data voltage

[0047] V DD Power supply for light-emitting components

[0048] V PDLC Control voltage

[0049] V TH1 :Conduction condition voltage

[0050] V TH2 Threshold voltage Detailed Implementation

[0051] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention.

[0052] Reference Figures 1 to 3 . Figure 1 This is a block diagram of a transparent display 100 according to some embodiments. Figure 2 This is a cross-sectional schematic diagram of pixel 200 in some embodiments. Figure 3 This is a schematic diagram of a control circuit 340 in some embodiments, suitable for a PDLC layer 310 in normal mode. The transparent display 100 includes a plurality of pixels 200. Each pixel 200 includes at least one sub-pixel 300. Figure 1 In some embodiments, each pixel 200 includes three sub-pixels 300. For example, the three sub-pixels 300 may be a red sub-pixel 300, a green sub-pixel 300, and a blue sub-pixel 300. In some embodiments, each pixel 200 includes only one sub-pixel 300, such as a white sub-pixel 300. The number of sub-pixels 300 and their emitted colors described above are merely examples, and the present invention does not limit the number of sub-pixels 300 in pixel 200 or their emitted colors.

[0053] Each sub-pixel 300 includes a polymer-dispersed liquid crystal (PDLC) layer 310, an electrode assembly 320, a light-emitting element 330, and a control circuit 340. The control circuit 340 includes a light-emitting control circuit 600, a judgment circuit 700, and a light-transmitting drive circuit 800. The electrode assembly 320 includes a first electrode 321 and a second electrode 322. A control voltage V is maintained between the first electrode 321 and the second electrode 322. PDLC The PDLC layer 310 is located between the first electrode 321 and the second electrode 322, so as to control the voltage V. PDLC It is in either a scattering state or a transmission state. The light-emitting element 330 is located in the PDLC layer 310 and receives a bias voltage V, thus being in either a light-emitting or non-light-emitting state depending on the bias voltage V. The light-emitting control circuit 600 is electrically connected to the light-emitting element 330 and configured to output a bias voltage V to the light-emitting element 330. Figure 7 Step S101). The determination circuit 700 is electrically connected to the light-emitting control circuit 600 and configured to output a drive signal S according to the bias voltage V. Figure 7Step S102). The light-transmitting driving circuit 800 is electrically connected to the judgment circuit 700 and the electrode group 320 and configured to generate a control voltage V according to the driving signal S. PDLC To electrode assembly 320 ( Figure 7 Step S103).

[0054] In some embodiments, the transparent display 100 further includes a first light-transmitting layer 110 and a second light-transmitting layer 120. Each pixel 200 is located between the first light-transmitting layer 110 and the second light-transmitting layer 120. For example, the first light-transmitting layer 110 and the second light-transmitting layer 120 can be made of transparent materials such as glass, plastic or resin.

[0055] like Figure 3 As shown, in some embodiments, the light emission control circuit 600 includes a scanning switch T SCAN And the light-emitting element driver switch T1. Scan switch T SCAN Includes a control terminal, a first terminal, and a second terminal. Scan switch T SCAN The control terminal receives the scan signal S SCAN (For example, the progressive scan signal of a typical LED display), causing the scan switch T SCAN Scanned signal S SCAN Driven to be in an on or off state. Scan switch T SCAN The first terminal receives data voltage V DATA Scan switch T SCAN The second terminal is electrically connected to the light-emitting element driving switch T1. Scan switch T SCAN When turned on, the data voltage V DATA A light-emitting element driving switch T1 is provided. The light-emitting element driving switch T1 includes a control terminal, a first terminal, and a second terminal. The control terminal of the light-emitting element driving switch T1 is connected to the scan switch T. SCAN The second terminal receives data voltage V DATA This causes the light-emitting element to drive the switch T1 to be subjected to the data voltage V. DATA The light-emitting element is driven to be in an on or off state. The first terminal of the light-emitting element drive switch T1 receives the power supply V from the light-emitting element. DD The second terminal of the light-emitting element drive switch T1 is electrically connected to the light-emitting element 330. When the light-emitting element drive switch T1 is turned on, it supplies power V to the light-emitting element. DD A light-emitting element 330 is provided. The light-emitting element 330 includes a positive terminal and a negative terminal. The positive terminal of the light-emitting element 330 is connected to the second terminal of the light-emitting element drive switch T1 to receive the light-emitting element power supply V. DD The cathode of the light-emitting element 330 is connected to the position, so that the light-emitting element 330 is powered by the light-emitting element power supply V. DD The light-emitting element 330 is either in a conducting or turning-off state due to the driving force. When the bias voltage V of the light-emitting element 330 is greater than the turn-on condition voltage V0 of the light-emitting element 330...TH1 The light-emitting element 330 will then emit light. In some embodiments, the light-emitting element 330 is implemented as an organic light-emitting diode (OLED) or a micro LED. In some embodiments, a capacitor C is connected between the control terminal of the light-emitting element driving switch T1 and the second terminal of the light-emitting element driving switch T1.

[0056] In some embodiments, the PDLC layer 310 is implemented with a common mode PDLC material. In some embodiments, the PDLC layer 310 is implemented with a reverse mode PDLC material. When the electrode assembly 320 applies a voltage (e.g., at least 5 volts) to the PDLC layer 310, it can control the liquid crystal alignment state in the PDLC material to be either a scattering state or a transmitting state, thereby controlling the light transmittance of the PDLC layer 310 to be either transparent or opaque. A common mode PDLC material is opaque in a scattering state when no voltage is applied, and transparent in a transmitting state after a voltage is applied. A reverse mode PDLC material is transparent in a transmitting state when no voltage is applied, and transparent in a scattering state after a voltage is applied. Figure 3 As shown, in some embodiments, the light-transmitting driving circuit 800 includes a PDLC driving switch T2. The PDLC driving switch T2 includes a control terminal, a first terminal, and a second terminal. The control terminal of the PDLC driving switch T2 receives a driving signal S, causing the PDLC driving switch T2 to be driven by the driving signal S to be in an on or off state. The first terminal of the PDLC driving switch T2 receives a PDLC power supply V. CC The second terminal of the PDLC drive switch T2 is electrically connected to electrode group 320. When the PDLC drive switch T2 is turned on, it supplies power to the PDLC power supply V. CC Provided to electrode assembly 320.

[0057] The PDLC material is distributed across the entire display area of ​​the transparent display 100 and at least covers one light-emitting surface of each light-emitting element 330. In some embodiments, the thickness of the PDLC layer 310 (i.e., the distance between the first electrode 321 and the second electrode 322) is at least 6 micrometers. In some embodiments, the thickness of the PDLC material covering the light-emitting surface of the light-emitting element 330 is 0.5 to 3 micrometers.

[0058] When the light-emitting element 330 emits light, the PDLC layer 310 is in a transparent state for display purposes. When the light-emitting element 330 does not emit light, the determination circuit 700 generates a driving signal S to drive the PDLC layer 310 to be transparent or opaque, depending on different requirements. For example, when the desired display effect is opaque black, the bias voltage V is set to a first bias voltage. In response to the bias voltage V being the first bias voltage, the light-emitting element 330 is in a non-emitting state, and the PDLC layer 310 is in a transparent state. In some embodiments, the first bias voltage is between the conduction condition voltage V of the light-emitting element 330. TH1 and the conduction condition voltage V TH1 The bias voltage V is between half of the desired value. For example, when the desired display effect is transparent black, the bias voltage V is set to the second bias voltage. In response to the second bias voltage V, the light-emitting element 330 is in a non-light-emitting state, and the PDLC layer 310 is in a scattering state. In some embodiments, the second bias voltage is less than the turn-on condition voltage V of the light-emitting element 330. TH1 Half of it.

[0059] The above control can be achieved by comparing the bias voltage V of the light-emitting element 330 with a threshold voltage when the light-emitting element 330 is not emitting light. Please refer to... Figure 3 and Figure 4 . Figure 4 This is a state table of some parameters in some embodiments, suitable for the PDLC layer 310 in normal mode. In some embodiments, the determination circuit 700 includes a comparator 341. The comparator 341 is electrically connected between the light-emitting element 330 and the PDLC drive switch T2 of the light-transmitting drive circuit 800, and is configured to compare the bias voltage V of the light-emitting element 330 with the threshold voltage V. TH2 This generates a drive signal S. Specifically, comparator 341 includes a positive input, a negative input, and an output. The positive input of comparator 341 is electrically connected to the anode of the light-emitting element 330 to receive the bias voltage V from the light-emitting element 330, and the negative input of comparator 341 receives the threshold voltage V. TH2 Furthermore, the output of comparator 341 is connected to the control terminal of PDLC drive switch T2 to output the drive signal S to the control terminal of PDLC drive switch T2. Therefore, when the bias voltage V of the light-emitting element 330 is less than the threshold voltage V... TH2 The drive signal S is low, preventing the PDLC drive switch T2 from turning on, thus enabling the PDLC layer 310 in normal mode to obtain a low-level control voltage V. PDLC It is opaque; and when the bias voltage V of the light-emitting element 330 is greater than or equal to the threshold voltage V TH2 When the drive signal S is high, the PDLC drive switch T2 is turned on, thereby enabling the PDLC layer 310 in normal mode to obtain a high-level control voltage V. PDLC And it is light-transmitting. In some embodiments, the power supply V of the light-emitting element...DD As it is a controllable voltage source, it is possible to control the power supply V of the light-emitting element when the light-emitting element 330 is not emitting light. DD The bias voltage V controls the light-emitting element 330.

[0060] Please refer to Figure 5 and Figure 6 . Figure 5 This is a schematic diagram of a control circuit 340 in some embodiments, adapted for a PDLC layer 310 in inversion mode. Figure 6 This is a state table of some parameters in some embodiments, suitable for the PDLC layer 310 in inverted mode. This embodiment is similar to... Figure 3 and Figure 4 The difference in the embodiment is that the positive input of comparator 341 receives the threshold voltage V. TH2 Furthermore, the negative input terminal of comparator 341 is electrically connected to the anode terminal of light-emitting element 330 to receive the bias voltage V of light-emitting element 330. Therefore, when the bias voltage V of light-emitting element 330 is less than the threshold voltage V... TH2 When the drive signal S is high, the PDLC drive switch T2 is turned on, thereby enabling the PDLC layer 310 in inversion mode to obtain a high-level control voltage V. PDLC It is opaque; and when the bias voltage V of the light-emitting element 330 is greater than or equal to the threshold voltage V TH2 The drive signal S is low, preventing the PDLC drive switch T2 from turning on, thereby enabling the PDLC layer 310 in inversion mode to obtain a low-level control voltage V. PDLC And it allows light to pass through.

[0061] In some embodiments, the threshold voltage V TH2 The conduction condition voltage V of the light-emitting element 330 TH1 Half of it.

[0062] like Figure 4 and Figure 6 As shown, in some embodiments, in response to the bias voltage V of the light-emitting element 330 being greater than or equal to the threshold voltage V TH2 The comparator 341 outputs a drive signal S at the first level, causing the light-transmitting drive circuit 800 to drive the PDLC layer 310 to transmit light; and in response to the bias voltage V of the light-emitting element 330 being less than the threshold voltage V TH2 The drive signal S output by comparator 341 is at the second level, causing the light-transmitting drive circuit 800 to drive the PDLC layer 310 to be opaque. In some embodiments, the first level is high and the second level is low.

[0063] In some embodiments, the transparent display 100 further includes an input interface 400. The input interface 400 is configured to receive and generate a light transmission setting in response to input from a user. Figure 8 and Figure 9Step S201). The input interface 400 can be implemented, for example, as an application executed by an electronic device electrically connected to the transparent display 100 or as software such as an on-screen display (OSD) menu of the transparent display 100. In some embodiments, the input interface 400 can be implemented as hardware such as a button, mouse, or touch screen. Depending on the light transmission setting, the bias voltage V of the light-emitting element 330 of each sub-pixel 300 in a region of the transparent display 100 when it is not emitting light is between the threshold voltage V and the light-emitting element 330. TH2 The conduction condition voltage V of the light-emitting element 330 TH1 Between these conditions, the PDLC layer 310 is transparent when the light-emitting element 330 is not emitting light. Figure 8 Step S202). In some embodiments, based on the light transmission setting, the bias voltage V of the light-emitting element 330 of each sub-pixel 300 in a region of the transparent display 100 when not emitting light is less than the threshold voltage V. TH2 This makes the PDLC layer 310 opaque when the light-emitting element 330 is not emitting light. Figure 9 Step S203). That is, the user can set a specific area of ​​the transparent display 100 through the input interface 400, so that the area is transparent when the light-emitting element 330 in the area does not emit light, or is set to be opaque when the light-emitting element 330 in the area does not emit light.

[0064] In some embodiments, the transparent display 100 further includes a light sensing module 500 to sense ambient brightness and generate a light transmission setting. Figure 10 and Figure 11 Step S301). In some embodiments, based on the light transmission setting, the bias voltage V of the light-emitting element 330 of each sub-pixel 300 of the transparent display 100 when not emitting light is between the threshold voltage V. TH2 The conduction condition voltage V of the light-emitting element 330 TH1 Between these conditions, the PDLC layer 310 is transparent when the light-emitting element 330 is not emitting light. Figure 10 (Step S302). In some embodiments, based on the light transmission setting, the bias voltage V of the light-emitting element 330 of each sub-pixel 300 of the transparent display 100 when it is not emitting light is less than the threshold voltage V. TH2 This makes the PDLC layer 310 opaque when the light-emitting element 330 is not emitting light. Figure 11 (Step S303). That is, the transparent display 100 can control the light-emitting elements 330 of each sub-pixel 300 to be transparent when not emitting light, or opaque when not emitting light, according to the ambient brightness.

[0065] In some embodiments, the light sensing module 500 includes a controller and a light sensor, and the controller determines whether the PDLC layer 310 is transparent or opaque when the light-emitting element 330 is not emitting light based on the ambient brightness sensed by the light sensor. For example, for the PDLC layer 310 in normal mode, when the ambient brightness sensed by the light sensor exceeds a threshold, it indicates that the ambient light is too high and it is easy for the user to not be able to see the display screen clearly. Therefore, the light transmission setting generated by the controller makes the bias voltage V less than the threshold voltage V0. TH2 (It is opaque when not emitting light). Conversely, when the ambient brightness sensed by the light sensor is below this threshold, it indicates that the ambient light is suitable for transparent display. Therefore, the light transmission setting generated by the controller keeps the bias voltage V between the threshold voltage V0 and the light emission setting. TH2 The conduction condition voltage V of the light-emitting element 330 TH1 It is translucent when it is not emitting light.

[0066] As described above, in some embodiments of the transparent display 100, the light-emitting element 330 is placed in the PDLC layer 310, so the control of the liquid crystal alignment state and a thinner thickness can be achieved simultaneously. In addition, the liquid crystal alignment state of the PDLC layer 310 can be controlled by the bias voltage V of the light-emitting element 330, so the architecture of the control circuit 340 is more streamlined.

[0067] Of course, the present invention may have other various embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention, but these corresponding changes and modifications should all fall within the protection scope of the appended claims.

Claims

1. A transparent display, characterized in that, Include: Multiple pixels, wherein each pixel comprises at least one sub-pixel, and each sub-pixel comprises: An electrode assembly includes a first electrode and a second electrode, wherein a control voltage is provided between the first electrode and the second electrode; A polymer-dispersed liquid crystal (PDLC) layer is located between the first electrode and the second electrode, and is in a scattering state or a transmission state according to the control voltage; A light-emitting element is located in the PDLC layer and receives a bias voltage, and is in a light-emitting state or a non-light-emitting state according to the bias voltage. A light-emitting control circuit is electrically connected to the light-emitting element and configured to output the bias voltage to the light-emitting element; A judgment circuit is electrically connected to the light-emitting control circuit and is configured to output a drive signal according to the bias voltage; as well as A light-transmitting driving circuit is electrically connected to the judgment circuit and the electrode group, and is configured to generate the control voltage to the electrode group according to the driving signal.

2. The transparent display as described in claim 1, characterized in that, In response to the bias voltage being a first bias voltage, the light-emitting element is in the non-light-emitting state, and the PDLC layer is in the transparent state.

3. The transparent display as described in claim 1, characterized in that, In response to the bias voltage being a second bias voltage, the light-emitting element is in the non-light-emitting state, and the PDLC layer is in the scattering state.

4. The transparent display as described in claim 1, characterized in that, The determination circuit includes a comparator electrically connected between the light-emitting element and the light-transmitting driving circuit, and is configured to compare the bias voltage of the light-emitting element with a threshold voltage to generate the driving signal.

5. The transparent display as described in claim 4, characterized in that, The threshold voltage is half of the conduction condition voltage of the light-emitting element.

6. The transparent display as described in claim 4, characterized in that, In response to the bias voltage of the light-emitting element being greater than or equal to the threshold voltage, the driving signal output by the comparator is a first level, causing the light-transmitting driving circuit to drive the PDLC layer to transmit light. Furthermore, in response to the bias voltage of the light-emitting element being less than the threshold voltage, the driving signal output by the comparator is a second level, causing the light-transmitting driving circuit to drive the PDLC layer to be opaque.

7. The transparent display as described in claim 4, characterized in that, It also includes an input interface configured to receive and respond to an input to generate a light transmission setting, and according to the light transmission setting, the bias voltage of the light-emitting element of each sub-pixel in a region of the transparent display when it is not emitting light is between the threshold voltage and a conduction condition voltage of the light-emitting element, so that the PDLC layer is transparent when the light-emitting element is not emitting light.

8. The transparent display as claimed in claim 4, characterized in that, It also includes an input interface configured to receive and respond to an input to generate a light transmission setting, and according to the light transmission setting, the bias voltage of the light-emitting element of each sub-pixel in a region of the transparent display is less than the threshold voltage when the light-emitting element is not emitting light, so that the PDLC layer is opaque when the light-emitting element is not emitting light.

9. The transparent display as described in claim 4, characterized in that, It also includes a light sensing module to sense an ambient brightness and generate a light transmission setting, wherein, according to the light transmission setting, the bias voltage of the light-emitting element of each sub-pixel of the transparent display when it is not emitting light is between the threshold voltage and a conduction condition voltage of the light-emitting element, so that the PDLC layer is transparent when the light-emitting element is not emitting light.

10. The transparent display as claimed in claim 4, characterized in that, It also includes a light sensing module to sense an ambient brightness and generate a light transmission setting, wherein, according to the light transmission setting, the bias voltage of the light-emitting element of each sub-pixel of the transparent display is less than the threshold voltage when it is not emitting light, so that the PDLC layer is opaque when the light-emitting element is not emitting light.

11. A control method for a transparent display, characterized in that, The transparent display includes a plurality of pixels, each pixel including at least one sub-pixel, each sub-pixel including an electrode group, a polymer-dispersed liquid crystal (PDLC) layer, and a light-emitting element. The electrode group includes a first electrode and a second electrode, the PDLC layer is located between the first electrode and the second electrode, the light-emitting element is located in the PDLC layer, and the control method includes: A bias voltage is output to the light-emitting element to control the light-emitting element to be in a light-emitting state or a non-light-emitting state; A drive signal is generated based on this bias voltage; and A control voltage is generated to the electrode group according to the drive signal to control the PDLC layer to be in a scattering state or a transmission state.

12. The control method as described in claim 11, characterized in that, The step of generating the driving signal based on the bias voltage of the light-emitting element includes: in response to the bias voltage being a first bias voltage, the light-emitting element is in the non-light-emitting state, and the PDLC layer is in the transparent state.

13. The control method as described in claim 11, characterized in that, The step of generating the driving signal based on the bias voltage of the light-emitting element includes: in response to the bias voltage being a second bias voltage, the light-emitting element is in the non-light-emitting state, and the PDLC layer is in the scattering state.

14. The control method as described in claim 11, characterized in that, The step of generating the drive signal based on the bias voltage of the light-emitting element includes: comparing the bias voltage of the light-emitting element with a threshold voltage to generate the drive signal.

15. The control method as described in claim 14, characterized in that, The threshold voltage is half of the conduction condition voltage of the light-emitting element.

16. The control method as described in claim 14, characterized in that, The step of controlling the transmittance of the PDLC layer by driving the electrode group according to the driving signal includes: In response to the bias voltage of the light-emitting element being greater than or equal to the threshold, the output is a first-level driving signal to drive the PDLC layer to transmit light; as well as In response to the bias voltage of the light-emitting element being less than the threshold, the output is a second-level driving signal to drive the PDLC layer to be opaque.

17. The control method as described in claim 14, characterized in that, The step of comparing the bias voltage of the light-emitting element with the threshold voltage to generate the driving signal includes: receiving and generating a light transmission setting in response to an input; and according to the light transmission setting, the bias voltage of the light-emitting element of each sub-pixel in a region of the transparent display when it is not emitting light is between the threshold voltage and a conduction condition voltage of the light-emitting element, so that the PDLC layer is transparent when the light-emitting element is not emitting light.

18. The control method as described in claim 14, characterized in that, The step of comparing the bias voltage of the light-emitting element with the threshold voltage to generate the driving signal includes: receiving and generating a light transmission setting in response to an input; and according to the light transmission setting, the bias voltage of the light-emitting element of each sub-pixel in a region of the transparent display is less than the threshold voltage when it is not emitting light, so that the PDLC layer is opaque when the light-emitting element is not emitting light.

19. The control method as described in claim 14, characterized in that, The step of comparing the bias voltage of the light-emitting element with the threshold voltage to generate the driving signal includes: sensing an ambient brightness to generate a light transmission setting; and according to the light transmission setting, the bias voltage of the light-emitting element of each sub-pixel of the transparent display when it is not emitting light is between the threshold voltage and a conduction condition voltage of the light-emitting element, so that the PDLC layer is transparent when the light-emitting element is not emitting light.

20. The control method as described in claim 16, characterized in that, The step of comparing the bias voltage of the light-emitting element with the threshold voltage to generate the driving signal includes: sensing an ambient brightness to generate a light transmission setting; and according to the light transmission setting, the bias voltage of the light-emitting element of each sub-pixel of the transparent display is less than the threshold voltage when it is not emitting light, so that the PDLC layer is opaque when the light-emitting element is not emitting light.

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