TWI784654B - Liquid crystal lens device - Google Patents

Abstract

A liquid crystal lens device includes a glass substrate, a patterned circuit and a detecting circuit. The patterned circuit is disposed on a surface of the glass substrate. The detecting circuit is coupled to the patterned circuit, and is configured to output a driving signal for driving the patterned circuit to output a detecting signal. The detecting circuit is configured to receive the detecting signal, and is configured to determine whether the liquid crystal lens device is dysfunctional according to the detecting signal.

Description

LCD lens element

The present invention relates to a projection element, and more particularly to a liquid crystal lens element.

A variety of projection devices can project images with different light emitting methods, including: for example, liquid crystal projection devices can use liquid crystal lens elements and backlight elements to project light. The liquid crystal lens element is disposed on the glass substrate and used for modulating the direction of light. Therefore, when at least one of the liquid crystal lens element or the glass substrate is damaged or abnormal, the image projected by the liquid crystal projection device will be affected.

The present invention provides a liquid crystal lens element, which can self-detect whether abnormalities such as damage, separation, or rupture occur, and when abnormalities are detected, the projection device can be notified of the occurrence of abnormalities for proper disposal.

The liquid crystal lens element of the present invention includes a first glass substrate, a patterned circuit and a detection circuit. The patterned circuit is disposed on the surface of the first glass substrate. The detection circuit is coupled to the patterned circuit, and is used to output a driving signal to drive the patterned circuit to output detection signal. The detection circuit receives the detection signal, and judges whether the liquid crystal lens element is abnormal according to the detection signal.

In an embodiment of the present invention, the above-mentioned liquid crystal lens element further includes a liquid crystal layer and a second glass substrate. The liquid crystal layer is disposed on the first glass substrate. The second glass substrate is disposed on the liquid crystal layer. The patterned circuit is further disposed on the surface of the second glass substrate.

In an embodiment of the present invention, the surface of the second glass substrate on which the patterned circuit is disposed is the upper surface and/or the lower surface of the second glass substrate.

In an embodiment of the invention, the second glass substrate includes an active area and a non-active area. The patterned circuit is disposed on the active area and/or the non-active area of the second glass substrate.

In an embodiment of the present invention, the surface of the first glass substrate on which the patterned circuit is disposed is the upper surface and/or the lower surface of the first glass substrate.

In an embodiment of the invention, the first glass substrate includes an active area and a non-active area. The patterned circuit is disposed on the active area and/or the non-active area of the first glass substrate.

In an embodiment of the present invention, the above detection circuit includes a driver circuit, a voltage acquisition circuit and a judgment circuit. The driver circuit is coupled to the patterning circuit, and is used for outputting a driving signal to drive the patterning circuit to output a detection signal according to at least one control signal. The voltage fetching circuit is coupled to the patterning circuit and is used for receiving a detection signal from the patterning circuit according to the control signal. The voltage acquisition circuit is used for obtaining the detection voltage of the detection signal, and outputting the detection voltage. The judging circuit is coupled to the voltage fetching circuit for receiving the detection voltage, and judging whether the liquid crystal lens element is abnormal according to the detection voltage and the reference voltage.

In an embodiment of the present invention, the above-mentioned control signal includes a first control signal and a second control signal. The above-mentioned voltage acquisition circuit includes a capacitive voltage acquisition circuit and a resistive voltage acquisition circuit. The capacitive voltage acquisition circuit is coupled to the patterned circuit for receiving a detection signal from the patterned circuit according to the first control signal. The capacitive voltage acquisition circuit obtains and outputs a detection voltage to the judgment circuit, and the detection voltage includes capacitance information of the patterned circuit. The resistive voltage-taking circuit is coupled to the patterned circuit for receiving a detection signal from the patterned circuit according to the second control signal. The resistive voltage acquisition circuit obtains and outputs a detection voltage to the judgment circuit, and the detection voltage includes resistance information of the patterned circuit.

In an embodiment of the present invention, the above-mentioned capacitive voltage-taking circuit and the above-mentioned resistive voltage-taking circuit do not operate at the same time.

In an embodiment of the present invention, the above judgment circuit includes a comparator circuit and a digital circuit. The comparator circuit is coupled to the voltage acquisition circuit for receiving and comparing the detection voltage and the reference voltage to output a comparison signal. The digital circuit is coupled to the comparator circuit for receiving the comparison signal and outputting a notification signal according to the comparison signal. The notification signal includes whether the liquid crystal lens element is abnormal.

Based on the above, the embodiment of the present invention can determine whether the liquid crystal lens element is abnormal according to the detection signal output by the patterned circuit by driving the patterned circuit disposed on the surface of the glass substrate. In this way, when abnormalities such as damage to the liquid crystal lens element, especially the glass substrate, or failure to work normally occur, the abnormality can be detected by itself to facilitate subsequent treatment.

In order to make the above-mentioned features and advantages of the present invention more obvious and understandable, the following special citations Embodiments, together with the accompanying drawings, are described in detail as follows.

1: Projection device

10: Liquid crystal element

11: Liquid crystal drive components

100: LCD lens element

110, 120: glass substrate

110a, 120a: inner surface

110b, 120b: outer surface

130: electrode layer

140: liquid crystal layer

150: Patterned circuit

160: Detection circuit

161: The first module

162: Second module

170: Optical components

180: Substrate

190:Laser

200: LCD lens element

250: Patterned circuit

251: first end

252: second end

300: LCD lens element

350: Patterned circuits

400: LCD lens element

410, 420: glass substrate

420a: inner surface

420b: External surface

430: electrode layer

440: liquid crystal layer

450: Patterned circuits

460: Detection circuit

500: LCD lens element

510, 520: glass substrate

510b: Outer surface

520a: inner surface

550: Patterned circuits

560: detection circuit

561: The first module

562: Second module

600: detection circuit

610: Driver circuit

611: control circuit

620: Take voltage circuit

621: Capacitive voltage taking circuit

622: Resistive voltage taking circuit

630: judgment circuit

631: Comparator circuit

632: Digital circuit

A1: Active area

A2: Non-active area

FLAG: notification signal

FOPEN, FSHORT: compare signals

LG1, LG2: scratchpad

LG3: OR gate

LT: cast light

S1: Drive signal

S2: Detection signal

ODT, SDT: control signal

VDET: detection voltage

VREF1: Reference signal

VREF2: reference voltage

FIG. 1A is a schematic cross-sectional view of a liquid crystal lens element according to an embodiment of the present invention.

FIG. 1B is a schematic diagram of a liquid crystal lens element according to an embodiment of the present invention.

FIG. 1C is an application schematic diagram of a liquid crystal lens element according to an embodiment of the present invention.

FIG. 1D is an application schematic diagram of a liquid crystal lens element according to an embodiment of the present invention.

FIG. 1E is a schematic diagram of a projection device according to an embodiment of the present invention.

FIG. 2 is a schematic top view of a liquid crystal lens element according to an embodiment of the present invention.

FIG. 3 is a schematic top view of a liquid crystal lens element according to an embodiment of the present invention.

FIG. 4 is a schematic cross-sectional view of a liquid crystal lens element according to an embodiment of the present invention.

FIG. 5 is a schematic top view of a liquid crystal lens element according to an embodiment of the present invention.

FIG. 6 is a schematic circuit diagram of a detection circuit according to an embodiment of the present invention.

FIG. 1A is a schematic cross-sectional view of a liquid crystal lens element according to an embodiment of the present invention, please refer to FIG. 1A . The liquid crystal lens element 100 can be disposed in a projection device (the projection device 1 shown in FIG. 1E ) for projecting light. The liquid crystal lens element 100 includes a glass substrate 110 , a glass substrate 120 , a plurality of electrode layers 130 , a liquid crystal layer 140 , a patterning circuit 150 and a detection circuit 160 . The glass substrate 110 has an inner surface 110a and an outer surface 110b, and the glass substrate 120 has an inner surface 120a and an outer surface 120b. The glass substrate 110 and the glass substrate 120 are disposed correspondingly and separated in space, and the liquid crystal layer 140 is disposed between the glass substrate 110 and the glass substrate 120 . In this embodiment, the glass substrate 110 is disposed on the glass substrate 120 , and the liquid crystal layer 140 is disposed on the glass substrate 120 . The electrode layer 130 is respectively disposed on the inner surface 110 a of the glass substrate 110 and the inner surface 120 a of the glass substrate 120 . The patterned circuit 150 is disposed on the glass substrate 120 . The detection circuit 160 is coupled to the patterning circuit 150 and can be disposed on the glass substrate 120 . In this embodiment, the patterned circuit 150 and the detection circuit 160 are both disposed on the inner surface 120 a of the glass substrate 120 .

The patterned circuit 150 can be a printed circuit formed on the surface to sense the abnormality or non-abnormality of the liquid crystal lens element 100, wherein the abnormality includes: for example, the glass substrate 110 or/and 120 is broken, disconnected and separated into multiple glass substrates, Or other damages that affect the normal display operation. The patterned circuit 150 can cooperate with at least one of the electrode layer 130 and the liquid crystal layer 140 to design a circuit. Thereby, when the liquid crystal lens element 100 is operating, abnormality or non-abnormality of the liquid crystal lens element 100 can be sensed without affecting the operation of the electrode layer 130 and/or the liquid crystal layer 140 .

The detection circuit 160 can be a circuit for driving and detecting the patterning circuit 150 to know whether the glass substrate 120 is abnormal. The detection circuit 160 is used to output a driving signal (a driving signal S1 shown in FIG. 6 ) to drive the patterning circuit 150 to output a detection signal (a detection signal S2 shown in FIG. 6 ). In addition, the detection circuit 160 is used for receiving the detection signal, and judging whether the liquid crystal lens element 100 is abnormal according to the detection signal. The detection circuit 160 can be a printed circuit formed on the surface.

FIG. 1B is a schematic diagram of a liquid crystal lens element 100 , please refer to FIG. 1A and FIG. 1B . Both the patterned circuit 150 and the detection circuit 160 are disposed on the inner surface 120 a of the glass substrate 120 . The detection circuit 160 is divided into at least two parts coupled to each other, wherein the at least two parts include: for example, a first module 161 and a second module 162 . The first module 161 and the second module 162 are disposed separately. The first module 161 and the second module 162 are respectively coupled to different terminals of the patterning circuit 150 to form an electrical loop with the patterning circuit 150 .

The first module 161 may include a driver circuit (the driver circuit 610 shown in FIG. 6 ). The first module 161 is used to drive the patterning circuit 150 . The second module 162 may include a voltage acquisition circuit (the voltage acquisition circuit 620 shown in FIG. 6 ) and a judgment circuit (the judgment circuit 630 shown in FIG. 6 ). The second module 162 is used for judging whether the liquid crystal lens element 100 is abnormal according to the detection signal output by the patterning circuit 150 .

In this way, the patterned circuit 150 disposed on the inner surface 120a of the glass substrate 120 can detect the detection signal output by the patterned circuit 150, and judge whether the operating element between the glass substrate 110 and the glass substrate 120 appears. abnormal. Therefore, the liquid crystal lens element 100 can not be limited to the use state, and can not need external detection The equipment can self-detect abnormalities to further reduce the occurrence of poor focus and light leakage affecting the normal operation of the projection device, and can further reduce the risk of eye damage caused by abnormalities.

FIG. 1C is a schematic diagram of the application of the liquid crystal lens element 100 , please refer to FIG. 1A and FIG. 1C . The liquid crystal lens element 100 can be applied in a projection device to project a plurality of projected light beams LT to superimpose and display projected images. The projected image includes: for example, a dot pattern, a flood pattern, a cross pattern or a special dot pattern, etc., but is not limited thereto.

Compared with the embodiment in FIG. 1A , in FIG. 1C , the liquid crystal lens element 100 further includes an optical element 170 , a substrate 180 and at least one laser 190 . The laser 190 is disposed on the substrate 180 , and the optical element 170 is disposed between the substrate 180 and the glass substrate 120 .

The laser 190 can be a diffractive optical element (Diffraction Optical Element, DOE), and the optical element 170 can be a vertical-cavity surface-emitting laser (Vertical-Cavity Surface-Emitting Laser, VCSEL). According to the content of the projected image, at least one laser 190 is driven to output corresponding laser light to the optical element 170 , and then output to the liquid crystal layer 140 after post-processing by the optical element 170 to project an image.

FIG. 1D is a schematic diagram of the application of the liquid crystal lens element 100 , and is another implementation manner of the embodiment shown in FIG. 1C , please refer to FIG. 1D . Compared with the embodiment of FIG. 1C , due to the different content of the projected image, in FIG. 1D , after the laser light is processed by the optical element 170 and the liquid crystal layer 140 , the projected beams of projection light LT are different.

FIG. 1E is a schematic diagram of a projection device according to an embodiment of the present invention. The projection device 1 may be a laser projection device, or may be a light emitting diode (LED) projection device. The projection device 1 includes a liquid crystal element 10 and a liquid crystal drive element 11 . The liquid crystal element 10 is coupled to the liquid crystal driving element 11 .

The liquid crystal element 10 may be provided with at least one liquid crystal lens element, such as the liquid crystal lens element 100 shown in FIGS. 1A to 1D , to project an image using the projection light LT. The liquid crystal drive element 11 may be provided with a detection circuit, such as at least a part of the detection circuit 160 shown in FIGS. 1A to 1B or the detection circuit 600 shown in FIG. It is judged whether or not abnormality has occurred in the liquid crystal lens element 100 .

FIG. 2 is a schematic top view of a liquid crystal lens element according to an embodiment of the present invention, please refer to FIG. 2 . FIG. 2 illustrates the upper glass substrate or the surface of the upper glass substrate (hereinafter referred to as the glass substrate) of the liquid crystal lens element 200, wherein the upper glass substrate and the upper glass substrate are respectively another embodiment of the glass substrates 110, 120 of FIG. 1 . More specifically, FIG. 2 shows the inner surface or the outer surface of the glass substrate, wherein the inner surface and the outer surface are respectively another embodiment of the inner surface 110a and the outer surface 110b of FIG. Alternative embodiments of surface 120a and outer surface 120b.

The glass substrate of the liquid crystal lens element 200 includes an active area A1 and an inactive area A2. The active area A1 is adjacent to the non-active area A2, and the non-active area A2 is arranged around the active area A1. The active area A1 can be the area where the liquid crystal is projected, such as the area where the glass substrates 110 and 120 overlap the liquid crystal layer 140 as seen in the cross-sectional direction of FIG. 1 . The non-active area A2 may be an area where projection of liquid crystals is excluded. Non-active area A2 is used to set up other circuit packages Including: for example, a liquid crystal driving circuit, a control circuit 611 shown in FIG. 6 and a detection circuit 160 shown in FIGS. 1A-1B .

In this embodiment, the patterned circuit 250 of the liquid crystal lens element 200 includes a first end 251 and a second end 252 , and is disposed in the inactive area A2 . The first end 251 of the patterning circuit 250 is coupled to a first module of the detection circuit (not shown) for receiving an initial detection signal driven by the first module. After the initial detection signal is transmitted through the patterned circuit 250, it is affected by the patterned circuit 250 and other surrounding circuit elements to generate a detection signal. The second terminal 252 of the patterning circuit 250 is coupled to the second module of the detection circuit for outputting a detection signal to the second module.

In this way, the patterned circuit 250 can be disposed on the surface of the glass substrate, which can reflect the circuit characteristics of at least one of the glass substrate or other surrounding circuit elements (eg, the electrode layer 130 ). In other words, the detection signal output by the patterning circuit 250 indicates the state of the glass substrate and/or other surrounding circuit elements, and indicates whether the liquid crystal lens element is abnormal or not.

FIG. 3 is a schematic top view of a liquid crystal lens element according to an embodiment of the present invention, please refer to FIG. 3 . FIG. 3 is another embodiment of FIG. 2 , and illustrates the inner surface or the outer surface of the glass substrate of the liquid crystal lens element 300 . Compared with the embodiment in FIG. 2 , in FIG. 3 , the patterned circuit 350 of the liquid crystal lens element 300 is disposed in the active area A1 . In this embodiment, the patterning circuit 350 is designed considering the structure and operation characteristics of the electrode layer 130 and the liquid crystal layer 140 to avoid blocking the operation of liquid crystal projection when the liquid crystal lens element 300 is working.

As shown in Figure 2-3, the patterned circuit can be placed on the glass substrate The inner surface or the outer surface of the glass substrate, and the patterned circuit can be disposed on the active area A1 or the inactive area A2 of the glass substrate. Accordingly, the liquid crystal lens element has good design flexibility to cope with different circuit designs.

FIG. 4 is a schematic cross-sectional view of a liquid crystal lens element according to an embodiment of the present invention, please refer to FIG. 4 . The liquid crystal lens element 400 of FIG. 4 is another embodiment of the liquid crystal lens element 100 of FIGS. 1A-1B . Specifically, the glass substrate 410, the glass substrate 420, the plurality of electrode layers 430, the liquid crystal layer 440, the patterning circuit 450, and the detection circuit 460 included in the liquid crystal lens element 400 are respectively another corresponding element in FIG. 1A. Example. Compared with the embodiment in FIG. 3 , in FIG. 4 , the patterned circuit 450 and the detection circuit 460 are disposed on the outer surface 420 b of the glass substrate 420 .

FIG. 5 is a schematic top view of a liquid crystal lens element according to an embodiment of the present invention, please refer to FIG. 5 . The liquid crystal lens element 500 of FIG. 5 is another embodiment of the liquid crystal lens element 100 of FIGS. 1A-1B and/or the liquid crystal lens element 400 of FIG. 4 . Specifically, the glass substrate 510, the glass substrate 520, the patterned circuit 550, the detection circuit 560, and the first module 561 and the second module 562 of the detection circuit 560 included in the liquid crystal lens element 500 are shown in FIG. 1B respectively. Another embodiment of the corresponding elements in . Compared with the embodiment in FIG. 1B , in FIG. 5 , the second module 562 of the detection circuit 560 is disposed on the outer surface 510 b of the glass substrate 510 . In addition, the patterned circuit 550 may have multiple configurations, and is disposed on the inner surface 510a and/or the outer surface 510b of the glass substrate 510 and the inner surface 520a and/or the outer surface 520b of the glass substrate 520 .

In this way, disposing the first module 561 and the second module 562 of the detection circuit 560 at different places can increase the design flexibility of the liquid crystal lens element 500 to cope with different same circuit design. For example, in the embodiment of FIGS. 1A-1B , the first module 161 and the second module 162 are separately disposed on the inner surface 120a of the glass substrate 120; in the embodiment of FIG. 4 , the corresponding module of the detection circuit 460 The group is separately arranged on the outer surface 120b of the glass substrate 120; in the embodiment of FIG. The surface 520a is not limited thereto. In other embodiments, multiple modules of the detection circuit can also be arranged at different positions in any combination of the inner and outer surfaces of the upper and lower glass substrates.

FIG. 6 is a schematic circuit diagram of a detection circuit according to an embodiment of the present invention, please refer to FIG. 6 . The detection circuit 600 is another embodiment of any one of the detection circuit 160 of FIGS. 1A-1B , the detection circuit 460 of FIG. 4 , or the detection circuit 560 of FIG. 5 . The detection circuit 600 includes a driver circuit 610 , a voltage acquisition circuit 620 and a judgment circuit 630 . At least one of the driver circuit 610 , the voltage fetching circuit 620 and the judging circuit 630 can be integrated into the same element, for example, the liquid crystal driving element 11 shown in FIG. 1E .

The driver circuit 610 is coupled to the control circuit 611 for receiving the control signals ODT, SDT and the reference signal VREF1. The driver circuit 610 is also coupled to the first end of the patterning circuit (for example, the first end 251 of the patterning circuit 250 in FIG. The patterning circuit is driven to output a detection signal S2.

The voltage fetching circuit 620 is coupled to the driver circuit 610 for receiving the control signals ODT and SDT. The voltage fetching circuit 620 is also coupled to the second terminal of the patterning circuit (for example, the second terminal 252 of the patterning circuit 250 in FIG. and at least one of the control signal SDT, receives the detection signal S2 from the patterning circuit and obtains the detection voltage VDET of the detection signal S2, and is used to output the detection voltage VDET.

The judging circuit 630 is coupled to the voltage fetching circuit 620 and is used for receiving the detection voltage VDET, and is used for judging whether the liquid crystal lens element is abnormal according to the detection voltage VDET and the corresponding reference voltage VREF2.

In this embodiment, the control signal ODT and the control signal SDT respectively instruct the voltage acquisition circuit 620 to operate in the capacitance mode and the resistance mode, so as to obtain the detection voltage VDET representing the capacitance information and the resistance information respectively. The control signal ODT and the control signal SDT respectively correspond to the reference signal VREF1 having respective voltage values.

In this embodiment, the voltage acquisition circuit 620 includes a capacitive voltage acquisition circuit 621 and a resistive voltage acquisition circuit 622 . The capacitive voltage acquisition circuit 621 is coupled to the resistive voltage acquisition circuit 622 . The capacitive voltage acquisition circuit 621 and the resistive voltage acquisition circuit 622 are respectively driven in response to the control signals ODT and SDT input from the driver circuit 610 , and do not operate simultaneously. The operation sequence and times of the capacitive voltage acquisition circuit 621 and the resistive voltage acquisition circuit 622 are not limited here.

When the driver circuit 610 inputs the control signal ODT to the voltage acquisition circuit 620 , the capacitive voltage acquisition circuit 621 is enabled, and the resistive voltage acquisition circuit 622 is disabled. At this time, the capacitive voltage acquisition circuit 621 is used to receive the detection signal S2 from the patterning circuit according to the control signal ODT, and is used to obtain and output the detection voltage VDET of the detection signal S2 to the judgment circuit 630, wherein the detection voltage VDET includes capacitance information of the patterned circuit.

When the driver circuit 610 inputs the control signal SDT to the voltage acquisition circuit 620 , the resistive voltage acquisition circuit 622 is enabled, and the capacitive voltage acquisition circuit 621 is disabled. At this time, the resistive voltage acquisition circuit 622 is used to receive the detection signal S2 from the patterning circuit according to the control signal SDT, and is used to obtain and output the detection voltage VDET of the detection signal S2 to the judgment circuit 630, wherein the detection voltage VDET includes resistance information of the patterned circuit.

In this way, by operating the voltage acquisition circuit 620 at different timings, the capacitance information and resistance information corresponding to the detection signal S2 can be obtained to cooperate with the judgment circuit 630 to judge whether the liquid crystal lens element is abnormal, or to further judge the type of the abnormality .

For example, if the glass substrate is broken and separated into multiple pieces of glass, the patterned circuit therein is correspondingly broken to form an open circuit. Therefore, the detection signal S2 output by the patterned circuit has extremely large resistance information. If the glass substrate and the electrode layer 130 fall off, or there are different gaps between the glass substrates due to deformation, different capacitance values will be formed between the patterned circuit and the electrode layer 130 accordingly. Therefore, the detection signal S2 output by the patterned circuit has variable capacitance information. If the glass substrate or other surrounding circuits are short-circuited, the patterned circuits therein are short-circuited accordingly. Therefore, the detection signal S2 output by the patterned circuit has extremely small resistance information and capacitance information.

In this embodiment, the judging circuit 630 includes a comparator circuit 631 and a digital circuit 632 . The comparator circuit 631 is coupled between the voltage acquisition circuit 620 and the digital circuit 632 . The comparator circuit 631 is used to process and compare the detection voltage VDET and the corresponding The corresponding reference voltage VREF2 is used to output a comparison signal to the digital circuit 632 . The digital circuit 632 is used for outputting a notification signal FLAG according to the comparison signal, wherein the notification signal FLAG indicates information including whether the liquid crystal lens element is abnormal.

The comparator circuit 631 can be realized by a comparator. In response to the control signal ODT or the control signal SDT, the comparator circuit 631 can selectively operate the open circuit detection function or the short circuit detection function to determine whether the capacitance information or the resistance information is abnormal.

When the voltage fetching circuit 620 operates in the capacitance mode according to the control signal ODT, the comparator circuit 631 compares the detection voltage VDET with the reference voltage VREF2 corresponding to the capacitance, and outputs a comparison signal, wherein the comparison signal indicates whether the capacitance information of the patterned circuit exceeds preset capacitance range.

When the voltage fetching circuit 620 operates in the resistance mode according to the control signal SDT, the comparator circuit 631 compares the detection voltage VDET with the reference voltage VREF2 corresponding to the resistance, and outputs a comparison signal, wherein the comparison signal indicates whether the resistance information of the patterned circuit exceeds Preset resistance range.

The digital circuit 632 may include registers LG1 , LG2 and an OR (OR) gate LG3 . The register LG1 and the register LG2 are connected in parallel between the comparator circuit 631 and the OR gate LG3.

The input terminal of the register LG1 is coupled to the comparator circuit 631 for temporarily storing a comparison signal corresponding to capacitance information. The output end of the register LG1 is inverted and then coupled to the OR gate LG3 for outputting the inverted comparison signal FOPEN to the OR gate LG3. The input end of the register LG2 is coupled to the comparator circuit 631 for temporarily storing the comparison signal corresponding to the resistance information. The output terminal of the register LG2 is coupled to the OR gate LG3 for outputting a comparison signal FSHORT to OR gate LG3.

The OR gate LG3 is used to determine whether at least one of the comparison signal FOPEN or the comparison signal FSHORT exceeds a corresponding preset range, and outputs a notification signal FLAG. When the notification signal FLAG is at the first logic level, it indicates that the liquid crystal lens element is abnormal. On the contrary, when the notification signal FLAG is at the second logic level, it indicates that there is no abnormality in the liquid crystal lens element.

In this embodiment, the detection voltage VDET and the reference voltage VREF2 can be analog signals, and the comparison signals FOPEN, FSHORT and the notification signal FLAG can be digital signals.

To sum up, the liquid crystal lens element of the embodiment of the present invention can judge whether the liquid crystal lens element is abnormal by detecting the patterned circuit arranged on the surface of the glass substrate, so that it can self-detect the abnormality, so as to reduce the influence on the normal operation of the projection device occurrence and risk. In some embodiments, the patterned circuit and the detection circuit can be arranged at any place on any surface of any glass substrate to detect abnormalities, so that the liquid crystal lens element has good circuit design flexibility. In some embodiments, the detection circuit can acquire corresponding capacitance information and resistance information according to different control signals, so as to further determine the type of the abnormality.

Although the present invention has been disclosed above with the embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the technical field may make some changes and modifications without departing from the spirit and scope of the present invention. The scope of protection of the present invention should be defined by the scope of the appended patent application.

100: LCD lens element

110, 120: glass substrate

110a, 120a: inner surface

110b, 120b: outer surface

130: electrode layer

140: liquid crystal layer

150: Patterned circuit

160: Detection circuit

Claims (10)

A liquid crystal lens element comprising: a first glass substrate; a patterned circuit disposed on a surface of the first glass substrate; and A detection circuit, coupled to the patterned circuit, and used to output a driving signal to drive the patterned circuit to output a detection signal, wherein the detection circuit receives the detection signal, and according to the detection signal It is judged whether the liquid crystal lens element is abnormal. The liquid crystal lens element as described in claim 1, further comprising: a liquid crystal layer disposed on the first glass substrate; and A second glass substrate is arranged on the liquid crystal layer, wherein the patterned circuit is further arranged on a surface of the second glass substrate. The liquid crystal lens element as claimed in claim 2, wherein the surface of the second glass substrate on which the patterned circuit is disposed is the upper surface and/or the lower surface of the second glass substrate. The liquid crystal lens element according to claim 2, wherein the second glass substrate includes an active area and an inactive area, and the patterned circuit is disposed on the active area and/or the inactive area of the second glass substrate. The liquid crystal lens element according to claim 1, wherein the surface of the first glass substrate on which the patterned circuit is disposed is an upper surface and/or a lower surface of the first glass substrate. The liquid crystal lens element according to claim 5, wherein the first glass substrate includes an active area and an inactive area, and the patterned circuit is disposed on the active area and/or the inactive area of the first glass substrate. The liquid crystal lens element as claimed in item 1, wherein the detection circuit includes: a driver circuit, coupled to the patterned circuit, for outputting the driving signal to drive the patterned circuit to output the detection signal according to at least one control signal; a voltage fetching circuit, coupled to the driver circuit and the patterning circuit, for receiving the detection signal from the patterning circuit according to the at least one control signal, wherein the voltage fetching circuit is used for obtaining the detection signal a detection voltage, and outputting the detection voltage; and A judging circuit, coupled to the voltage fetching circuit, is used to receive the detection voltage, and judge whether the liquid crystal lens element is abnormal according to the detection voltage and a reference voltage. The liquid crystal lens element as described in claim 7, wherein the at least one control signal includes a first control signal and a second control signal, and the voltage obtaining circuit includes: a capacitive voltage acquisition circuit coupled to the patterned circuit for receiving the detection signal from the patterned circuit according to the first control signal, wherein the capacitive voltage acquisition circuit obtains and outputs the detection voltage to the judgment circuit, and the detection voltage includes capacitance information of the patterned circuit; and a resistive voltage acquisition circuit coupled to the patterned circuit for receiving the detection signal from the patterned circuit according to the second control signal, wherein the resistive voltage acquisition circuit obtains and outputs the detection voltage to The judging circuit, and the detection voltage includes resistance information of the patterned circuit. The liquid crystal lens element as claimed in claim 8, wherein the capacitive voltage acquisition circuit and the resistive voltage acquisition circuit do not operate at the same time. The liquid crystal lens element as claimed in item 7, wherein the judgment circuit includes: a comparator circuit, coupled to the voltage fetching circuit, for receiving and comparing the detection voltage and the reference voltage to output a comparison signal; and A digital circuit, coupled to the comparator circuit, is used to receive the comparison signal and output a notification signal according to the comparison signal, wherein the notification signal includes whether the liquid crystal lens element is abnormal.

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