A multi-voltage liquid crystal gate driving system

Abstract

The application discloses a multi-voltage liquid crystal gate driving system, which comprises a power module, a pixel voltage modulation module, a common voltage modulation module and a voltage output module. The power module is used for outputting a power voltage. The pixel voltage modulation module is used for modulating a pixel voltage required by multi-voltage liquid crystal gate driving. The common voltage modulation module is used for modulating a common voltage required by multi-voltage liquid crystal gate driving. The voltage output module is electrically connected to the common voltage modulation module to output a voltage to be modulated to the common voltage modulation module. The voltage switching module is electrically connected to the power module and the voltage output module respectively, so that the voltage switching module can output a plurality of switching voltages coupled with the power voltage to the voltage output module. The application has the beneficial effect of providing a multi-voltage liquid crystal gate driving system based on switching different resistances and voltage polarity reversal to output a plurality of common voltages and pixel voltages to modulate a plurality of gray scale voltages.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of liquid crystal gate driving system, more particularly, to a multi-voltage liquid crystal gate driving system. BACKGROUND

[0002] LCOS(Liquid Crystal on Silicon, silicon-based liquid crystal) is a micro display device closely combined with large-scale integrated circuits and liquid crystal display technology. LCOS uses a semiconductor CMOS integrated circuit chip as the substrate of a reflective LCD. A thin layer of liquid crystal silicon is coated on the CMOS chip. The control circuit is placed behind the display device, which can improve the light transmittance, thereby achieving greater light output and higher resolution. The driving mode of LCOS pixels includes analog driving and digital driving. LCOS screens implemented by digital driving mode have the advantage of small area and are widely used.

[0003] In the related art, such as Chinese patent document CN105529007A, a driving circuit of an ITO electrode in an LCOS display structure is integrated in the LCOS display structure. The driving circuit generates a driving voltage of the ITO electrode according to the working voltage of the LCOS display structure. The driving circuit of the ITO electrode and the LCOS display structure use the same power supply.

[0004] However, this scheme does not provide a multi-voltage liquid crystal gate driving system based on switching different resistances and voltage polarity inversion to output multiple common voltages and pixel voltages to modulate multiple gray scale voltages. SUMMARY

[0005] The summary part of the present application is used to introduce the concepts in a brief form, which will be described in detail in the specific embodiment part. The summary part of the present application is not intended to identify the key features or essential features of the claimed technical solution, nor is it intended to limit the scope of the claimed technical solution.

[0006] Some embodiments of the present application propose a positive and negative electrode multi-voltage timing modulation LCOS liquid crystal gate driving system to solve the technical problems mentioned in the background part.

[0007] As a first aspect of the present application, some embodiments of the present application provide a multi-voltage liquid crystal gate driving system, comprising: a power supply module configured to output a power supply voltage; a pixel voltage modulation module configured to modulate a pixel voltage required for multi-voltage liquid crystal gate driving; and a common voltage modulation module configured to modulate a common voltage required for multi-voltage liquid crystal gate driving; wherein the power supply module is electrically connected to the pixel voltage modulation module to couple the pixel voltage with the power supply voltage; the common voltage modulation module is electrically connected to the power supply module and the pixel voltage modulation module to couple the common voltage with the power supply voltage and the pixel voltage; the multi-voltage liquid crystal gate driving system comprises: a voltage output module electrically connected to the common voltage modulation module to output a to-be-modulated voltage to the common voltage modulation module; and a voltage switching module electrically connected to the power supply module and the voltage output module to enable the voltage switching module to output a plurality of switching voltages coupled with the power supply voltage to the voltage output module.

[0008] Further, the power supply module comprises a digital-to-analog conversion unit configured to convert a digital quantity into an analog quantity to output a stable analog voltage.

[0009] Further, the digital-to-analog conversion unit comprises a digital-to-analog converter.

[0010] Further, the power supply module comprises a voltage follower unit electrically connected to the digital-to-analog conversion unit to enable the voltage follower unit to convert the analog voltage output by the digital-to-analog conversion unit into a power supply voltage having the same value and lower impedance.

[0011] Further, the voltage follower unit comprises a first amplifier.

[0012] Further, the voltage output module comprises a voltage inverter unit configured to convert a lower-impedance power supply voltage input into an inverting output voltage having opposite polarity and coupled therewith.

[0013] Further, the voltage inverter unit comprises a second amplifier.

[0014] Further, the pixel voltage modulation module comprises an amplification unit electrically connected to the power supply module to enable the amplification unit to convert the power supply voltage input into an amplification output voltage greater than the power supply voltage and coupled therewith.

[0015] Further, the amplification unit comprises a third amplifier.

[0016] Further, the common voltage modulation module comprises a fourth amplifier.

[0017] The application has the beneficial effect of providing a multi-voltage liquid crystal gate drive system capable of outputting multiple common voltages and pixel voltages based on switching different resistances and voltage polarity inversion to modulate multiple gray scale voltages.

[0018] More specifically, some embodiments of the application can produce the following specific beneficial effects:

[0019] By dynamically controlling the input voltage through software to adjust the gray scale voltage, the internal liquid crystal can be rotated by 90°, solving the LCoS liquid crystal fatigue problem, prolonging the LCOS liquid crystal display life and ensuring the stability of the LCOS liquid crystal display. BRIEF DESCRIPTION OF DRAWINGS

[0020] The accompanying drawings, which form a part of this application, are intended to provide further understanding of the application and are incorporated herein in their entirety, and they illustrate specific embodiments of the application. The detailed description of the application and its illustrations serve to explain the application without imposing undue limitation on the application.

[0021] In addition, throughout the drawings, the same or similar reference numerals are used to represent the same or similar elements. It should be understood that the drawings are schematic, and the elements and elements are not necessarily drawn to scale.

[0022] In the drawings:

[0023] Figure 1 is a schematic diagram of a multi-voltage liquid crystal gate drive system according to an embodiment of the application;

[0024] Figure 2 is a schematic diagram of a pixel voltage modulation module according to an embodiment of the application;

[0025] Figure 3 is a schematic diagram of a common voltage modulation module according to an embodiment of the application;

[0026] Figure 4 is a schematic diagram of a voltage output module according to an embodiment of the application;

[0027] Figure 5 is a schematic diagram of a voltage switching module according to an embodiment of the application.

[0028] Figure 6 is a schematic diagram of a power supply module according to an embodiment of the application;

[0029] Figure 7 is a schematic diagram of a multi-voltage liquid crystal gate drive system circuit according to an embodiment of the application;

[0030] Figure 8 is a schematic diagram of a common voltage cycle change according to an embodiment of the application;

[0031] Figure 9 is a gray voltage diagram according to an embodiment of the present application.

[0032] The meanings of the reference numerals in the figures are as follows:

[0033] V p , a first digital-to-analog converter input voltage;

[0034] V A2 , a second digital-to-analog converter input voltage;

[0035] V1, a pixel voltage;

[0036] V2, a common voltage;

[0037] V_LC, a gray voltage;

[0038] 100, a power module;

[0039] 200, a voltage output module;

[0040] 300, a pixel voltage modulation module;

[0041] 400, a common voltage modulation module;

[0042] 500, a voltage switching module;

[0043] 600, a multi-voltage liquid crystal gate drive system;

[0044] 102, a first amplifier;

[0045] 202, a second amplifier;

[0046] 302, a third amplifier;

[0047] 402, a fourth amplifier;

[0048] 502, a voltage switching module;

[0049] DAC1, a first digital-to-analog converter;

[0050] DAC2, a second digital-to-analog converter;

[0051] VCC1, a first reference voltage;

[0052] VCC2, a second reference voltage;

[0053] VCC3, a third reference voltage;

[0054] 310, a metal oxide semiconductor transistor;

[0055] 308, a non-polar capacitor;

[0056] 406, a first voltage dividing resistor;

[0057] 304, second voltage dividing resistor;

[0058] 410, third voltage dividing resistor;

[0059] 404, fourth voltage dividing resistor;

[0060] 208, fifth voltage dividing resistor;

[0061] 306, sixth voltage dividing resistor;

[0062] 408, seventh voltage dividing resistor;

[0063] 204, eighth voltage dividing resistor;

[0064] 206, ninth voltage dividing resistor;

[0065] 104, tenth voltage dividing resistor;

[0066] 5011, eleventh voltage dividing resistor;

[0067] 5012, twelfth voltage dividing resistor;

[0068] 5013, thirteenth voltage dividing resistor;

[0069] 5014, fourteenth voltage dividing resistor;

[0070] 5015, fifteenth voltage dividing resistor;

[0071] 5020, zero channel;

[0072] 5021, first channel;

[0073] 5022, second channel;

[0074] 5023, third channel;

[0075] 5024, fourth channel;

[0076] 5025, fifth channel. DETAILED DESCRIPTION

[0077] Embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. While certain embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be embodied in various forms and should not be interpreted as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be more thoroughly and completely understood. It should be understood that the drawings of the present disclosure are for illustrative purposes only and are not intended to limit the scope of the present disclosure.

[0078] In addition, it needs to be noted that only parts related to the present application are shown in the drawings for the convenience of description. The embodiments in the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0079] It should be noted that the concepts of "first", "second", and the like mentioned in the present disclosure are only used to distinguish different devices, modules or units, and are not intended to limit the order or interdependence of the functions performed by these devices, modules or units.

[0080] It should be noted that the modification of "one" or "multiple" mentioned in the present disclosure is illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise explicitly indicated in the context, it should be understood as "one or more".

[0081] The names of the messages or information exchanged between the plurality of devices in the embodiments of the present disclosure are only for illustrative purposes, and are not intended to limit the scope of the messages or information.

[0082] The present disclosure will be described in detail below with reference to the drawings and in conjunction with embodiments.

[0083] As shown in Figure 1 The multi-voltage liquid crystal gate drive system 600 includes a power supply module 100 for outputting a power supply voltage, a pixel voltage modulation module 300 for modulating a pixel voltage V1 required for multi-voltage liquid crystal gate drive, a common voltage modulation module 400 for modulating a common voltage V2 required for multi-voltage liquid crystal gate drive, a voltage output module 200 electrically connected to the common voltage modulation module 400 to output a to-be-modulated voltage to the common voltage modulation module 400, and a voltage switching module 500 electrically connected to the power supply module 100 and the voltage output module 200 respectively so that the voltage switching module 500 can output a plurality of switching voltages coupled with the power supply voltage to the voltage output module 200.

[0084] In combination with Figure 2 and Figure 7As shown in the figure, the pixel voltage modulation module 300 is used to modulate the pixel voltage V1 required by the multi-voltage liquid crystal gate drive. The pixel voltage modulation module 300 comprises an amplification unit, and the amplification unit is electrically connected with the power module 100 so that the amplification unit converts the power voltage input by the power module 100 into an amplified output voltage greater than and coupled with the power voltage. The pixel voltage modulation module 300 comprises a third amplifier 302, a second voltage dividing resistor 304, a sixth voltage dividing resistor 306, a non-polar capacitor 308, and a metal oxide transistor 310. The positive input end 3022 of the third amplifier 302 is connected with the second digital-to-analog converter DAC2. The output end 3021 of the third amplifier 302 is electrically connected to the positive input end 4022 of the fourth amplifier 402 through a first voltage dividing resistor 406, the negative input end 3023 of the third amplifier 302 is electrically connected to the output end 3021 of the third amplifier 302 through a second voltage dividing resistor 304, the positive power supply end 3024 of the third amplifier 302 is connected with the second reference voltage VCC2, the negative power supply end 3025 of the third amplifier 302 is grounded, the negative input end 3023 of the third amplifier 302 is grounded through a sixth voltage dividing resistor 306, the output end 3021 of the third amplifier 302 is grounded through a non-polar capacitor 308, and the output end 3021 of the third amplifier 302 is connected with the first reference voltage VCC1 through a metal oxide transistor. The resistance values of the second voltage dividing resistor 304 and the sixth voltage dividing resistor 306 are equal to R. The voltage after the non-polar capacitor 308 and the metal oxide diode at the output end 3021 of the third amplifier 302 is the pixel voltage V1.

[0085] In combination Figure 3 And Figure 7As shown in the figure, the common voltage modulation module 400 is used to modulate the common voltage V2 required by the multi-voltage liquid crystal gate drive. The common voltage modulation module 400 includes: a fourth amplifier 402, a seventh voltage dividing resistor 408, a third voltage dividing resistor 410, and a fourth voltage dividing resistor 404. The positive input end 4022 of the fourth amplifier 402 is connected to ground through the seventh voltage dividing resistor 408, the negative input end 4023 of the fourth amplifier 402 is electrically connected to the output end 4021 of the fourth amplifier 402 through the third voltage dividing resistor 410, the negative input end 4023 of the fourth amplifier 402 is electrically connected to the output end 2021 of the second amplifier 202 through the fourth voltage dividing resistor 404, the positive power supply end 4024 of the fourth amplifier 402 is connected to the second reference voltage VCC2, and the negative power supply end 4025 of the fourth amplifier 402 is connected to the negative phase of the second reference voltage VCC2. Among them, the third voltage dividing resistor 410 is 2 times the resistance value of the fourth voltage dividing resistor 404, which is 2R, and the first voltage dividing resistor 406 is 5 times the resistance value of the seventh voltage dividing resistor 408, which is 5R. The voltage at the output end 4021 of the fourth amplifier 402 after passing through the third voltage dividing resistor 410 is the common voltage V2.

[0086] In combination Figure 4 And Figure 7 As shown in the figure, the voltage output module 200 is electrically connected to the common voltage modulation module 400 to output the to-be-modulated voltage to the common voltage modulation module 400. The voltage output module 200 includes a voltage flipping unit, which is used to convert the power supply voltage with lower impedance input into the flipped output voltage with opposite polarity and coupling. The voltage output module 200 includes: a second amplifier 202, an eighth voltage dividing resistor 204, a fifth voltage dividing resistor 208, and a ninth voltage dividing resistor 206. The positive input end 2022 of the second amplifier 202 is electrically connected to the output end 1021 of the first amplifier 102 through the eighth voltage dividing resistor 204, the negative input end 2023 of the second amplifier 202 is electrically connected to the output end 2021 of the second amplifier 202 through the fifth voltage dividing resistor 208, the negative input end 2023 of the second amplifier 202 is electrically connected to the output end 1021 of the first amplifier 102 through the ninth voltage dividing resistor 206, the positive power supply end 2024 of the second amplifier 202 is connected to the second reference voltage VCC2, and the negative power supply end 2025 of the second amplifier 202 is connected to the negative phase of the second reference voltage VCC2. Among them, the resistance values of the fifth voltage dividing resistor 208, the eighth voltage dividing resistor 204, and the ninth voltage dividing resistor 206 are equal, which is R.

[0087] In combination Figure 5 And Figure 7As shown, the voltage switching module 500 is electrically connected to the power supply module 100 and the voltage output module 200, enabling the voltage switching module 500 to output multiple switching voltages coupled to the power supply voltage to the voltage output module 200. The voltage switching module 500 provides loads with different resistance values ​​for the multi-voltage liquid crystal gate driving system. The voltage switching module 500 has a common terminal and several channel terminals. The common terminal of the voltage switching module 500 is electrically connected to the positive input terminal 2022 of the second amplifier 202, and the channel terminals of the voltage switching module 500 are electrically connected to load resistors with different resistance values. Specifically, the zeroth channel 5020 is grounded, the fifth channel 5025 is floating, and the resistance values ​​of the eleventh voltage divider resistor 5011, the twelfth voltage divider resistor 5012, the thirteenth voltage divider resistor 5013, the fourteenth voltage divider resistor 5014, and the fifteenth voltage divider resistor 5015 are 0, R / 2, R / 4, 3R / 4, and R, respectively. The input terminal of the voltage switching module is connected to a control signal, which is generated by a CPU or FPGA chip.

[0088] Combination Figure 6 and Figure 7 As shown, the power supply module 100 is used to output a power supply voltage. The power supply module 100 includes a digital-to-analog converter (DAC) unit that converts a digital signal to an analog signal to output a stable analog voltage. The DAC unit includes a digital-to-analog converter (DAC). The power supply module includes a voltage follower unit, which is electrically connected to the DAC unit so that the voltage follower unit converts the analog voltage output by the DAC unit into a power supply voltage with the same value but lower impedance. The voltage follower unit includes a first amplifier. The power supply module 100 includes: a first amplifier 102 and a tenth-degree voltage resistor 104. The first amplifier 102 is used to generate a stable input voltage. The positive input terminal 1022 of the first amplifier 102 is connected to the first DAC 1, the negative input terminal 1023 of the first amplifier 102 is electrically connected to the output terminal 1021 of the first amplifier 102 through the tenth-degree voltage resistor 104, the positive power supply terminal 1024 of the first amplifier 102 is connected to a third reference voltage VCC3, and the negative power supply terminal 1025 of the first amplifier 102 is grounded.

[0089] Multi-voltage liquid crystal gate driving system circuit, such as Figure 7 As shown, taking the voltage switching module 500 selecting the zero channel 5020 and the fifth channel 5025 as an example, the input voltage of the first digital-to-analog converter DAC1 is set to Vp. After the input voltage Vp passes through the first amplifier, the output terminal 1021 of the first amplifier outputs a stable input voltage Vp. The input voltage Vp passes through the first amplifier 102 and is input to the second amplifier 202.

[0090] When the voltage switching module 500 selects the zero channel 5020, since the resistance of the eleventh voltage divider resistor 5011 is 0, i.e., the zero channel 5020 is grounded, -Vp is obtained at the output terminal 2021 of the second amplifier 202, thus achieving a voltage polarity reversal from Vp to -Vp. When the voltage switching module 500 selects the fifth channel 5025, since the fifth channel 5025 is floating, Vp is obtained at the output terminal 2021 of the second amplifier 202.

[0091] Set the input voltage of the second digital-to-analog converter DAC2 to V. A2 V A2 After being amplified by 2 times by the third amplifier 302, the pixel voltage V1 is obtained at the output terminal 3021 of the third amplifier 302. The calculation formula for pixel voltage V1 is as follows:

[0092] V1 = 2V A2 (Formula 1)

[0093] The voltage at the output terminal 2021 of the second amplifier 202 is input to the negative input terminal 4023 of the fourth amplifier 402, and the voltage at the output terminal 3021 of the third amplifier 302 is input to the positive input terminal 4022 of the fourth amplifier 402. After being amplified by 2 times by the fourth amplifier 402, a common voltage V2 is obtained at the output terminal 4021 of the fourth amplifier 402. The formula for calculating the common voltage V2 is as follows:

[0094] V2 = V A2 -2V p Or V2 = V A2 +2V p (Formula 2)

[0095] According to Equations 1 and 2, it is only necessary to control the input voltage V of the first digital-to-analog converter DAC1. p The input voltage V of the second digital-to-analog converter DAC2 A2 It can control the pixel voltage V1 and the common voltage V2, and the pixel voltage V1 and the common voltage V2 are related.

[0096] like Figure 8 The positive and negative changes and alternating recovery period of the common voltage V2 shown have a total of 9 voltage output points, which are V1->Vp+->Vp-->Vss->Vp-->Vp+->Vp-->Vss-->Vp-, where Vss=0V.

[0097] like Figure 9 As shown, the formula for calculating the grayscale voltage V_LC is as follows:

[0098] V_LC=V2-V1(or VSS=0V) (Formula 3)

[0099] The above description is merely exemplary of some of the many possible embodiments of the present disclosure and of the principles thereof. It is to be understood that those skilled in the art will be able to devise various embodiments of the present disclosure without departing from the scope of the present disclosure as disclosed in the above description and attached claims, and that the scope of the present disclosure is not limited to the specific technical features described above. For example, the technical features described above can be replaced with other technical features with similar functions disclosed in the embodiments of the present disclosure (but not limited to) to form other technical solutions.

Claims

1. A multi-voltage liquid crystal gate driving system, comprising: a power module for outputting a power voltage; a pixel voltage modulation module for modulating a pixel voltage required by the multi-voltage liquid crystal gate driving; a common voltage modulation module for modulating a common voltage required by the multi-voltage liquid crystal gate driving; wherein the power module is electrically connected to the pixel voltage modulation module to couple the pixel voltage with the power voltage; the common voltage modulation module is electrically connected to the power module and the pixel voltage modulation module to couple the common voltage with the power voltage and the pixel voltage; characterized in that: the multi-voltage liquid crystal gate driving system comprises: a voltage output module electrically connected to the common voltage modulation module to output a voltage to be modulated to the common voltage modulation module; a voltage switching module electrically connected to the power module and the voltage output module to enable the voltage switching module to output a plurality of switching voltages coupled with the power voltage to the voltage output module; the pixel voltage modulation module (300) comprises an amplification unit electrically connected to the power module (100) to enable the amplification unit to convert the power voltage input by the power module (100) into an amplified output voltage greater than the power voltage and coupled with the power voltage; the positive input end (3022) of the third amplifier (302) is connected to the second digital-to-analog converter (DAC2); the negative input end (4023) of the fourth amplifier (402) is electrically connected to the output end (2021) of the second amplifier (202) through a fourth voltage dividing resistor (404); the voltage output module (200) is electrically connected to the common voltage modulation module (400) to output a voltage to be modulated to the common voltage modulation module (400); the voltage switching module (500) is electrically connected to the power module (100) and the voltage output module (200) to enable the voltage switching module (500) to output a plurality of switching voltages coupled with the power voltage to the voltage output module (200); the voltage switching module (500) has a common end and a plurality of channel ends; the common end of the voltage switching module (500) is electrically connected to the positive input end (2022) of the second amplifier (202); the channel ends of the voltage switching module (500) are electrically connected to load resistors with different resistances, respectively; the output end (3021) of the third amplifier (302) inputs a voltage to the positive input end (4022) of the fourth amplifier (402). 2.The multi-voltage liquid crystal gate driving system according to claim 1, characterized in that: the power module comprises a digital-to-analog conversion unit for converting a digital quantity into an analog quantity to output a stable analog voltage. 3.The multi-voltage liquid crystal gate driving system according to claim 2, characterized in that: the digital-to-analog conversion unit comprises a digital-to-analog converter. 4.The multi-voltage liquid crystal gate driving system according to claim 2, characterized in that: The power module comprises a voltage follower unit, and the power follower unit is electrically connected with the digital-to-analog conversion unit so that the voltage follower unit converts the analog voltage output by the digital-to-analog conversion unit into the power voltage with the same value and lower impedance.

5. The multi-voltage liquid crystal gate driving system according to claim 4, wherein: The voltage follower unit comprises a first amplifier.

6. The multi-voltage liquid crystal gate driving system according to claim 1, wherein: The voltage output module comprises a voltage flipping unit, and the voltage flipping unit is used to convert the power voltage with lower impedance input into the flipping output voltage with opposite polarity and coupling.

7. The multi-voltage liquid crystal gate driving system according to claim 6, wherein: The voltage flipping unit comprises a second amplifier.

8. The multi-voltage liquid crystal gate driving system according to claim 1, wherein: The pixel voltage modulation module comprises an amplification unit, and the amplification unit is electrically connected with the power module so that the amplification unit converts the power voltage input into the amplification output voltage greater than the power voltage and coupled with the power voltage.

9. The multi-voltage liquid crystal gate driving system according to claim 8, wherein: The amplification unit comprises a third amplifier.

10. The multi-voltage liquid crystal gate driving system according to claim 1, wherein: The common voltage modulation module comprises a fourth amplifier.

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