WO2020125316A1 - 投影显示装置及其控制方法 - Google Patents

投影显示装置及其控制方法 Download PDF

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Publication number
WO2020125316A1
WO2020125316A1 PCT/CN2019/120164 CN2019120164W WO2020125316A1 WO 2020125316 A1 WO2020125316 A1 WO 2020125316A1 CN 2019120164 W CN2019120164 W CN 2019120164W WO 2020125316 A1 WO2020125316 A1 WO 2020125316A1
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Prior art keywords
light source
signal
control signal
circuit
control
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PCT/CN2019/120164
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English (en)
French (fr)
Inventor
陈许
吴凯
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青岛海信激光显示股份有限公司
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Publication of WO2020125316A1 publication Critical patent/WO2020125316A1/zh

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/001—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2053—Intensity control of illuminating light
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]

Definitions

  • the present application relates to projection display technology, in particular to a projection display device and its control method.
  • DLP Digital Light Processing
  • FIG. 1 shows a schematic diagram of a DLP projection control system.
  • the DLP control circuit is the core of the entire projection system control.
  • the DLP control processing section 200 may be a main control chip.
  • the power supply unit 300 supplies power to the entire DLP control circuit system, and supplies power to the laser assembly 110 by connecting the laser drive circuit 120.
  • the DLP control processing section 200 generates an image display enable signal and a PWM brightness adjustment signal to the laser drive circuit 120 based on the image signal decoded by the video source, and the DLP control processing section 200 outputs the image signal to the light valve 210 and converts it into The drive signal corresponding to the light valve DMD chip drives the tiny mirror on the surface of the DMD chip to flip at different angles.
  • the DLP control processing unit sends the red light control signal R_PWM, the green light control signal G_PWM, the blue light control signal B_PWM, and the yellow light control signal Y_PWM to cause the light source to display red light, green light, blue light, or yellow light, respectively.
  • the DLP control processing section 210 outputs a red primary color light enable signal R_EN and a red primary color light brightness adjustment signal R_PWM to the laser driving circuit 120, and the laser driving circuit 120 processes the above signals After (such as anti-attenuation, and digital-to-analog conversion) output to the laser assembly 110, the laser assembly 110 emits red primary color light of corresponding color and brightness according to the corresponding signal.
  • the light valve 210 receives the image display content signal corresponding to the red component and is driven by the corresponding driving signal, thereby completing the signal modulation of the red primary light.
  • the DLP control processing part controls the output of the three primary colors through time sequence, and synchronously controls the light valve to perform signal modulation on the color, and finally forms a projection image through the projection lens.
  • the present application provides a projection display device and a control method thereof, which can adjust the control signal used by the DLP control circuit to control the display state of the light source component, and ensure the reliability of the light source component brightness adjustment signal, and can make the projection display device dynamic
  • the contrast reaches the maximum state, improves the layering of the image displayed by the projection display device, and improves the visual perception effect of the image.
  • a first aspect of the present application provides a projection display device, including:
  • DLP control circuit used to output image display enable signal and brightness adjustment signal to drive and control the light source component
  • the light source driving chip is connected to the DLP control circuit, and is used to transmit the above-mentioned image display enable signal and brightness adjustment signal to the light source assembly;
  • Light source assembly electrically connected to the light source drive circuit, used to switch the display state according to the image display enable signal and the brightness adjustment signal;
  • the light source driving circuit includes a processing circuit and a light source driving chip
  • the DLP circuit is connected to the light source driving chip through the processing circuit, and sends a first control signal to the light source driving chip, so that the light source driving chip controls the display state of the light source assembly;
  • the processing circuit When the voltage of the first control signal sent by the DLP circuit to the light source driving chip through the processing circuit is less than or equal to a preset threshold, the processing circuit outputs a second control signal to the light source driving chip, the second control signal is used to make the light source driving chip control the light source The component is off.
  • a second aspect of the present application provides a control method of a projection display device, including:
  • the DLP control circuit receives the image display signal and outputs a first control signal to the light source driving circuit.
  • the first control signal is used to enable the light source driving circuit to control the display state of the light source assembly;
  • the light source driving circuit receives the first control signal and outputs a second control signal, and the second control signal is used to put the light source assembly in an extinguished state;
  • the light source driving circuit receives and outputs the first control signal to the light source assembly and causes the light source assembly to emit light.
  • a third aspect of the present application also provides a control method of a projection display device, including:
  • the DLP control circuit outputs the timing signal corresponding to the signal component of at least one color and the first brightness adjustment signal
  • the light source driving circuit receives the timing signal and the first brightness adjustment signal, and combines the timing signal to adjust the output value of the first brightness adjustment signal, where the value of the first brightness adjustment signal is not zero.
  • a fourth aspect of the present application provides a device for executing an instruction, including:
  • a processor a memory, and a computer program; wherein the computer program is stored in the memory and is configured to be executed by the processor, the computer program includes a program for performing any one of the foregoing second aspect Instructions for the method described.
  • a fifth aspect of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed, the computer program can be implemented as described in any one of the foregoing second aspects method.
  • the present application provides a projection display device and a control method thereof. If the voltage of the first control signal sent by the DLP control circuit of the projection display device to the light source driving circuit is less than or equal to a preset threshold, the light source driving circuit outputs to the light source assembly
  • the second control signal enables the projection display device to control the light source driving circuit not to output a non-zero voltage to the light source assembly according to the second control signal when it is required to display a pure black image, which also enables the light source driving circuit not to output more than the light source
  • the threshold current of the light source is turned on, so that the dynamic contrast of the projection display device reaches the maximum state, the layered sense of the image displayed by the projection display device is improved, and the visual perception effect of the image is improved.
  • FIG. 1 is a schematic diagram of the principle of the DLP control system in the related art
  • FIG. 2 is a schematic diagram of a DLP projection system provided by an embodiment of this application.
  • FIG. 3 is a schematic diagram of an exemplary light source driving circuit of the projection display device provided by the present application.
  • FIG. 4 is a schematic diagram of a circuit connection structure of a light source driving of a projection display device
  • FIG. 5 is a schematic diagram of an exemplary circuit structure of a projection display device provided by this application.
  • FIG. 6 is a schematic diagram of an exemplary circuit structure of a projection display device provided by this application.
  • FIG. 7 is a schematic diagram of an exemplary technical effect of a projection display device provided by this application.
  • FIG. 8 is a schematic flowchart of an exemplary control method of a projection display device provided by this application.
  • FIG. 9 is an exemplary timing control diagram of a projection display device provided by this application.
  • FIG. 10 is a schematic flowchart of an exemplary control method of a projection display device provided by the present application.
  • FIG. 2 is a schematic diagram of a projection system architecture provided by an embodiment of the present application.
  • the DLP control circuit displays the target image as required Content, by sending a control signal to the light source drive circuit, the light source drive circuit controls the color and brightness emitted by the light source, and finally the light source controls the color information and brightness information of the target image in accordance with the control of the light source drive circuit.
  • the micro lens device Digital Micromirror Device, DMD for short
  • DMD Digital Micromirror Device
  • the DLP control processing section needs to control the light source display by sending a red light control signal R_PWM, a green light control signal G_PWM, a blue light control signal B_PWM, and a yellow light control signal Y_PWM to the light source drive circuit, respectively Red light, green light, blue light or yellow light.
  • R_PWM red light control signal
  • G_PWM green light control signal
  • B_PWM blue light control signal
  • Y_PWM yellow light control signal
  • the DLP control circuit needs to set R_PWM, G_PWM, B_PWM, and Y_PWM to control signals with a voltage of 0V and send them to the light source driving circuit.
  • the DLP control circuit and the light source driving circuit are usually provided in the form of an integrated chip in the projection display device.
  • the voltage transmitted between the DLP control circuit and the light source driving circuit is 0V
  • the signal of the DLP control circuit if it needs to send a control signal with a voltage of 0V to the light source driving circuit, the DLP control circuit actually outputs the control signals R_PWM, G_PWM, B_PWM and Y_PWM to the light source driving circuit may be configured as The voltage is slightly greater than 0V.
  • the DLP control circuit when the DLP control circuit needs to display a pure black image or the voltage of the control signal of a certain color in the image to be displayed needs to be 0V, due to the control in the projection display device
  • the configuration of the system the voltage of the control signal R_PWM, G_PWM, B_PWM or Y_PWM that the DLP control circuit actually sends to the light source drive circuit is not 0V.
  • the voltage of the control signal is slightly greater than 0V and applied to the light source driving circuit, it is easy to cause the light source driving circuit to output current to the light source. The controllability of this non-zero signal is poor.
  • the definition of dynamic contrast is: the ratio of white image information to black image information in a frame.
  • the layering of the image can be enhanced, making the image more vivid visual experience, so it is necessary to improve
  • the dynamic contrast of the display device makes it possible to maximize the dynamic contrast within the range allowed by the projection display device. And this non-zero signal output phenomenon also brings instability to the circuit control, which is not conducive to the reliability of the control circuit.
  • a processing circuit is provided, and the voltage of the first control signal sent by the DLP control circuit of the projection display device to the light source driving circuit is determined to be less than or equal to a preset threshold ,
  • the second control signal is output to the light source driving circuit, so that when the display device needs to display a pure black image, the light source driving circuit can be controlled according to the second control signal not to output a voltage to the light source, so that the light source driving circuit can not
  • the light source outputs a current that exceeds the threshold for lighting the light source, which further maximizes the dynamic contrast of the projection display device, improves the layering of the image displayed on the projection display device, and improves the visual perception of the image.
  • the projection display device provided in this embodiment includes: a DLP control circuit 1, a light source driving circuit 2 and a light source assembly 3, wherein the light source driving circuit 2 includes a processing circuit 21 and a light source driving chip 22.
  • the DLP control circuit 1 is used to send a control signal to the light source driving chip 22 through the processing circuit 21, so that the light source driving chip 22 controls the display state of the light source assembly 3 according to the control signal.
  • the display state includes: turning on or off the light source, brightness of each color of the light source, and so on.
  • the processing circuit 21 is provided between the DLP control circuit 1 and the light source driving chip 22 and is used to process the control signal sent by the DLP control circuit 1 to the light source driving chip 22.
  • the processing circuit 21 is specifically configured to, if it is determined that the voltage of the first control signal sent by the DLP control circuit 1 to the light source driver 3 is less than or equal to the preset threshold, the processing circuit 21 controls not to output the received light to the light source driver chip 22 The first control signal, but output a second control signal to the light source driving chip 22, wherein the second control signal is used to make the light source driving chip 22 control the light source assembly 3 in the off state; and when the voltage of the first control signal is greater than the If the threshold is set, the processing circuit 21 controls the output of the first control signal sent by the DLP control circuit 1 to the light source driving chip 22.
  • the first control signal sent by the DLP control circuit 1 to the light source driving chip 22 in this embodiment may include a light source for controlling the light source driving chip to display red light, green light, and blue light, respectively.
  • a yellow light control signal R_PWM, a green light control signal G_PWM, a blue light control signal B_PWM, and in some embodiments, may also include a yellow light control signal Y_PWM.
  • the preset threshold value is the first control signal that actually sends a voltage greater than 0V due to the working mechanism of the DLP projection control system when the DLP control circuit 1 in the display device needs to send a control signal with a voltage of 0V to the light source driving chip 22 Voltage value.
  • the second control signal may be any control signal for indicating to the light source driving chip 22 that the light source assembly 3 is in the extinguished state.
  • the second control signal may be a control signal with a voltage of 0V; or, the second control signal may be a signal for indicating to the light source driving chip 22 that the voltage of the first control signal is 0V;
  • the signal is a control signal with a voltage of 0V as an example for description, and is not intended to be a limitation.
  • the DLP control circuit 1 when the DLP control circuit 1 needs to control the light source assembly 3 to turn off, it sends a first control signal with a voltage of 0 to the light source driving chip 22. Due to the reliability of the operation of the projection display device, the actual DLP control circuit 1 drives the light source The first control signal sent by the chip 22 is configured to 0.1V.
  • the current output by the light source driving chip 22 to the light source is 0.05A greater than the threshold current for lighting the light source, such as 0.03A, which in turn causes the light source driving chip 22
  • the light source assembly 3 is actually lit according to the first control signal, which affects the dynamic contrast of the image displayed by the light source and the display effect.
  • the preset threshold can be set to 0.1V, when the voltage of the first control signal is less than or equal to 0.1V, it means that the first control signal is a signal for controlling the light source assembly 3 to turn off, regardless of the first
  • the control circuit 2 will output a second control with a voltage value of 0V to the light source driving chip 22
  • the signal current that the light source driving chip 22 outputs to the light source assembly 3 according to the second control signal is 0A, so that the light source assembly 3 is in an extinguished state.
  • the processing circuit 21 provided in this embodiment is specifically used to obtain the first control signal sent by the DLP control circuit 1 to the light source driving chip 22, and determine whether the voltage of the first control signal is less than or equal to a preset threshold.
  • the processing circuit 21 may be a circuit provided between the DLP control circuit 1 and the light source driving chip 22. The signals sent by the DLP control circuit 1 to the light source driving chip 22 will pass through the processing circuit 21 and be judged by the processing circuit 21.
  • the processing circuit 21 determines that the voltage of the first control signal is less than or equal to the preset threshold, the processing circuit 21 is further used to output the second control signal to the light source driving chip 22.
  • the second control signal may be a signal with a voltage of 0V.
  • the processing circuit 21 determines that the voltage of the first control signal is greater than a preset threshold, the processing circuit 21 is further used to output the first control signal to the light source driving chip 22.
  • the processing circuit 21 can directly output the acquired first control signal to the light source driving chip 22 after acquiring the first control signal; or, the processing circuit 21 can output the first control signal to the light source driving chip 22 A control signal having the same voltage value as the control signal causes the light source driving chip 22 to receive the control signal having the same voltage as the first control signal through the processing circuit 21.
  • the processing circuit 21 may output the first control signal or the second control signal to the light source driving chip 22 through an internal comparator and a logic circuit device. For example, when the processing circuit 21 determines that the voltage of the first control signal is less than or equal to the preset threshold, it can send the first level signal to the comparator and the logic circuit device. After the comparator and the logic circuit device receive the first level signal , Output the second control signal to the light source driving chip 22; and when the processing circuit 21 judges that the voltage of the first control signal is greater than the preset threshold, it can send the second level signal to the comparator and logic circuit device, the comparator and the logic circuit After receiving the second level signal, the device outputs the first control signal to the light source driving chip 22.
  • the processing circuit can output the second control signal to the light source driving chip , so that the projection display device can control the light source driving chip not to output a voltage to the light source according to the second control signal when it is required to display a pure black image, which also enables the light source driving chip not to output a current exceeding the light source lighting threshold to the light source, Therefore, it is possible to prevent the light source originally controlled by the DLP control circuit from being extinguished due to the configuration of the projection display device when it should be extinguished, on the one hand, it improves the reliability of the brightness control of the light source assembly, and can maximize the dynamic contrast of the projection display device
  • the state improves the sense of hierarchy of the image displayed by the projection display device, and improves the visual experience of the image.
  • the projection display device provided in this embodiment specifically improves the dynamic contrast of the
  • the embodiments of the present application further provide specific circuit structures of processing circuits in two projection display devices.
  • control signals sent by the DLP control circuit 1 to the light source driving circuit 3 in the related art one is a color control signal for controlling the display of the light source, such as R_PWM, G_PWM, B_PWM, and Y_PWM; the other It is a duty signal used to control the light source, for example: PWM duty signal.
  • FIG. 4 is a schematic diagram of a circuit connection structure of a light source driving of a projection display device.
  • a circuit connection mode of the light source driving chip N2 is shown.
  • the voltage of the control signal obtained by the light source driving chip N2 through the control pin VCTRL is not 0, the voltage of the control signal will be loaded on the sampling resistor R8 connected to the light source driving chip N2, and for the sampling resistor R8 in the figure
  • the corresponding current value Ilaser will also be obtained according to the formula.
  • Vctrl is the voltage of the control pin CTRL of the light source driving chip N2
  • R8 is the resistance value of the sampling resistor
  • LD_PWM_IN is the first control signal sent by the DLP control circuit to the light source driving chip N2.
  • the DLP control circuit 1 sends the first control signal to the light source driving chip N2, and the light source driving chip N2 receives the control signal (the first control signal or Second control signal).
  • the processing circuit provided in this embodiment is provided between the output end of the DLP control circuit 1 and the control pin CTRL1 of the light source driving chip N2, and the first control signal output by the DLP control circuit 1 acquired by the processing circuit 21 is recorded as LD_PWM_IN And the control signal actually sent by the processing circuit 21 to the control pin CTRL1 of the light source driving chip N2 is recorded as LD_PWM_OUT.
  • the processing circuit 21 provided in the embodiment shown in FIG. 5 includes a voltage comparator N3.
  • the first input terminal IN- of the voltage comparator N3 is used to receive the first control signal LD_PWM_IN output by the DLP control circuit 1
  • the second input terminal IN+ of the voltage comparator N3 is used to receive the comparison that the voltage is the preset threshold Signal Vref.
  • the voltage comparator N3 is used to compare the voltage of the first control signal LD_PWM_IN and the voltage of the comparison signal Vref. And if the LD_PWM_IN voltage of the first control signal is less than or equal to the voltage of the comparison signal Vref, the output terminal VOUT of the voltage comparator N3 outputs a first level signal to the selector N8.
  • the first level signal is used to control the selector N8 to The control pin CTRL1 of the light source driving chip N2 outputs a second control signal; if the voltage of the first control signal LD_PWM_IN is greater than the voltage of the comparison signal Vref, the output terminal VOUT of the voltage comparator N3 outputs a second level signal to the selector N8, The second level signal is used to control the selector N8 to output the first control signal to the control pin CTRL1 of the light source driving chip N2.
  • the processing circuit provided in the embodiment shown in FIG. 5 further includes: a selector N8.
  • the first input terminal B1 of the selector N8 is used to receive the first control signal LD_PWM_IN, the second input terminal B2 of the selector N8 is grounded; the selection terminal S of the selector N8 is used to receive the first power output by the voltage comparator N3 Level signal or second level signal.
  • the output terminal A of the selector N8 outputs a second control signal to the control pin CTRL1 of the light source driving chip N2; if When the selection terminal S of the selector N8 receives the second level signal sent by the voltage comparator N3, the output terminal A of the selector N8 outputs the first control signal to the control pin CTRL1 of the light source driving chip N2.
  • the states of the voltage comparator N3 and the selector N8 can refer to Table 1 and Table 2.
  • the voltage of the first control signal LD_PWM_IN of the input voltage comparator N3 is less than or equal to the voltage of the comparison signal Vref
  • the first level signal output from the output terminal VOUT of the voltage comparator N3 to the selector N8 is a low-level signal.
  • the output terminal A of the selector N8 outputs the second control signal to the control pin CTRL1 of the light source driving chip N2 It is a control signal with a voltage of 0V.
  • the second level signal output from the output terminal VOUT of the voltage comparator N3 to the selector N8 is a high level signal.
  • the voltage of 5V after the selector S of the selector N8 receives the high level signal, the output A of the selector N8 outputs the received first control signal to the control pin CTRL1 of the light source driving chip N2 LD_PWM_IN.
  • FIG. 6 is a schematic diagram of a circuit structure of another embodiment of a projection display device provided by the present application; the control circuit provided in the embodiment shown in FIG. 6 is also provided at the output end of the DLP control circuit 1 and the duty of the light source driving chip N2 Between the pins PWM and used to compare the voltage of the first control signal LD_PWM_IN sent by the DLP control circuit 1 to the light source driving chip N2 with the preset contrast signal Vref, and then to the light source driving chip N2.
  • the duty cycle pin PWM sends the duty cycle signal.
  • the setting mode and working principle of the voltage comparator N136 shown in FIG. 6 are the same as those of the voltage comparator N3 shown in FIG. 5 and will not be repeated here.
  • the processing circuit further includes: an AND circuit N135.
  • the first input PIN1 of the AND circuit N135 is used to receive the duty signal LD_DUTY_R_INPUT of the first control signal
  • the second input PIN2 of the AND circuit N135 is used to receive the first output of the AND circuit N135.
  • the AND circuit N135 is used to AND the duty signal LD_DUTY_R_INPUT of the first level signal and the first control signal, Output to the duty cycle pin PWM of the light source driving chip N2; if the second input pin PIN2 of the AND circuit N135 receives the second flat signal, the AND circuit N135 is used to convert the second level signal and the first control signal After performing the AND operation on the duty ratio signal LD_DUTY_R_INPUT, it is output to the second pin.
  • the states of the voltage comparator N136 and the AND circuit N135 can be referred to Tables 3 and 4.
  • the first level signal output from the output terminal VOUT of the voltage comparator N136 to the AND circuit N135 is a low level signal, low
  • the output terminal PIN3 of the AND circuit N135 outputs the second control signal to the duty cycle pin PWM of the light source driving chip N2 is A low-level duty cycle signal of 0V obtained by calculating the sum of the duty cycle signal LD_DUTY_R_INPUT of the first control signal and the low-level signal.
  • the second level signal output from the output terminal VOUT of the voltage comparator N3 to the AND circuit N135 is a high level signal, and the AND gate After the PIN2 of the circuit N135 receives the high-level signal, the output terminal PIN3 of the AND circuit N135 outputs the first control signal to the duty cycle pin PWM of the light source driving chip N2, which is the duty cycle of the first control signal
  • the ratio signal LD_DUTY_R_INPUT and the high-level signal are compared with the duty cycle signal LD_DUTY_R.
  • FIG. 7 is a schematic diagram of the technical effect of the projection display device provided by the present application.
  • the left coordinate system shown in FIG. 7 shows a voltage schematic diagram of the first control signal LD_PWM_IN sent by the DLP control circuit to the light source driving circuit in the related art, where when the voltage of the first control signal is less than the contrast voltage Vref There is no situation where the voltage is zero.
  • the processing of the processing circuit after adding the processing circuit between the DLP control circuit and the light source driving chip, the processing of the processing circuit makes the voltage of the first control signal sent by the DLP control circuit to the light source driving chip through the processing circuit less than When comparing the voltage Vref, the processing circuit actually sends a second control signal with a voltage of 0V to the light source driving chip. Furthermore, when the display device needs to display a pure black image, it can control the light source driving circuit not to output a voltage to the light source according to the second control signal with a voltage of 0V, so that the light source driving circuit cannot output more light to the light source than the light source is lit.
  • Threshold current which can prevent the light source originally controlled by the DLP control circuit from being extinguished due to the configuration of the display device when it should be extinguished, which improves the reliability of the brightness control of the light source assembly and maximizes the dynamic contrast of the projection display device
  • the state improves the sense of hierarchy of the image displayed by the projection display device, and improves the visual experience of the image.
  • FIG. 8 is a schematic flowchart of an embodiment of a method for controlling a projection display device provided by this application.
  • the control method of this example uses a DLP projection display device.
  • the DLP projection display device includes a DLP control circuit, a light source driving circuit, and a light source assembly.
  • the control method of the projection display device provided in this embodiment includes:
  • the DLP control circuit receives the image display signal and outputs a first control signal to the light source driving circuit.
  • the first control signal is used to enable the light source driving circuit to control the display state of the light source assembly;
  • the DLP control circuit outputs the enable signal of the primary light of the image signal, and the PWM brightness adjustment signal corresponding to the primary light to the light source driving circuit.
  • the light source includes a laser component, or a laser component and a wavelength conversion device.
  • the light emission of the wavelength conversion device is also indirectly controlled by driving the laser component. Therefore, the light source driving circuit is specifically a driving circuit of a laser assembly.
  • the control chip in the light source drive circuit has input pins, such as the CTRL1 pin and the CTRL2 pin of the light source drive chip shown in FIG. 4, which are used to receive the PWM brightness adjustment signal and enable the actual output to the laser component, respectively. Energy signal.
  • the processing circuit shown in FIG. 5 or FIG. 6 is provided between the output end of the DLP control circuit and the input end of the light source driving circuit. Specifically, the processing circuit shown in FIG. 5 or FIG. 6 is used to receive at least the output of the DLP control circuit. PWM brightness adjustment signal of a primary color.
  • the above-mentioned first control signal corresponds to the PWM brightness adjustment signal of a certain primary color light.
  • the light source driving circuit receives the first control signal and outputs a second control signal, and the second control signal is used to put the light source assembly in an extinguished state;
  • the processing circuit illustrated in FIG. 5 or FIG. 6 After the first control signal corresponding to the PWM brightness adjustment signal of the primary color light passes through the processing circuit illustrated in FIG. 5 or FIG. 6, a circuit composed of a voltage comparator and the like in the processing circuit outputs a corresponding output control signal according to the input signal.
  • the output control signal is specifically a second control signal, and the second control signal may specifically be a voltage signal with a value of zero.
  • the second control signal is output to the CTRL1 pin of the light source driving chip N2 shown in FIG. 4 and becomes a PWM brightness adjustment signal to be actually output to the laser assembly.
  • the light source driving circuit receives and outputs the first control signal to the light source component, and causes the light source component to emit light.
  • a circuit composed of a voltage comparator and the like in the processing circuit outputs a corresponding output control signal according to the input signal.
  • the output control signal is specifically the first control signal input by the processing circuit .
  • the first control signal is output to the CTRL1 pin of the light source driving chip N2 shown in FIG. 4 and becomes the PWM brightness adjustment signal to be actually output to the laser assembly.
  • steps 102 and 103 do not have a sequential order, but have different processing results when different input conditions are satisfied.
  • the implementation method and principle of the control method of the projection display device provided in this embodiment are the same as the implementation method and principle of the projection display device shown in FIG. 3 and will not be repeated here.
  • FIG. 10 is a schematic flowchart of another embodiment of a method for controlling a projection display device provided by this application.
  • the method embodiment is applied to a DLP projection display device, where the DLP projection display device includes a DLP control circuit, a light source driving circuit and a light source assembly.
  • the control method of the projection display device provided in this embodiment includes:
  • S201 Analyze the screen content of the image to be displayed to obtain at least one color signal component of the screen content.
  • the control method of the projection display device provided in the embodiment shown in FIG. 10 can be applied to the projection display device using DLP technology as shown in FIG. 2, when the projection display device further includes a codec circuit and an FPGA algorithm
  • the processing circuit, etc. can decode the image to be displayed, and output the decoded image signal to the DLP control circuit. After processing the screen content of the image to be displayed through the DLP control circuit, it can be used to represent the image to be displayed.
  • the signal component of at least one color of the screen content for example, the projection display device can determine the gray scale value of the signal component of the three primary colors.
  • the DLP control circuit outputs the timing signal and the first brightness adjustment signal corresponding to the signal component of the at least one color.
  • FIG. 9 is a diagram showing an example of timing control of three primary colors of light in a projection display device.
  • red, green, and blue are the three primary colors used for image display
  • a light valve component is used, and the three primary colors are irradiated to the light valve component in sequence, and the light valve decomposes the three primary color components according to the image.
  • the display signal modulates the light beams of the three primary colors separately so as to enter the projection lens for imaging.
  • the timing signals corresponding to the green and blue display signal components are both in an invalid state.
  • the effective means that the timing signal is high level (in circuit control, usually the high level is an effective signal), which is used to allow the primary light to be in a specific period within an output cycle Output.
  • Invalid means that the primary light is not allowed to be output during an output period except for a certain period of time.
  • the light source assembly may include three laser light sources: a red laser, a green tri-color laser, and a blue laser.
  • the red laser is allowed to light up at this time, but the blue laser and green laser are not allowed to light up.
  • the light emission brightness of the red laser is controlled by the brightness adjustment signal PWM signal, which is the first in step S202 Determined by the brightness adjustment signal, not shown in this illustration.
  • the blue laser is allowed to light, and the red laser and green laser are not allowed to light.
  • the specific lighting value is still determined by the corresponding PWM brightness adjustment signal.
  • the timing signal B_EN of the blue laser is invalid, it means that the blue laser is not allowed to light up in theory. At this time, the brightness adjustment signal corresponding to the blue laser should be zero.
  • the light source driving circuit receives the timing signal and the first brightness adjustment signal, and combines the timing signal to adjust the output value of the first brightness adjustment signal, where the value of the first brightness adjustment signal is not zero.
  • the light source driving circuit may adjust the output value of the first brightness adjustment signal in combination with the timing signal as follows:
  • the light source driving circuit When the timing signal is an invalid signal and the first brightness adjustment signal does not satisfy the preset condition, the light source driving circuit outputs a second brightness adjustment signal, and the second brightness adjustment signal is used to make the light source driving chip adjust to the light source The output current value is smaller than the lighting current value of the light source assembly.
  • the gray scale values of the signal components of at least one color determined in S101 are all 0
  • the voltage value of the first brightness adjustment signal determined in S202 is also 0.
  • the DLP control circuit and the light source driving circuit are usually provided in the form of an integrated chip in the projection display device. In order to ensure the reliability of the chip operation, the voltage transmitted between the DLP control circuit and the light source driving circuit is 0V , The voltage value of the first brightness adjustment signal may not be 0.
  • the light source driving circuit outputs the second brightness adjustment signal after processing, so that the light source driving circuit adjusts The current value output to the light source is less than the lighting current value of the light source, to ensure that the light source is in an extinguished state, and to achieve a situation where no light beam is emitted during image display, the image is displayed as black.
  • the above-mentioned preset condition may be a voltage preset value range.
  • the first brightness adjustment signal satisfies the preset condition, that is, the first brightness signal corresponds to the brightness adjustment signal of the laser required for displaying the pure black image to be displayed, then The first brightness adjustment signal is output to the light source driving circuit to provide the driving signal to the laser.
  • the second brightness adjustment signal is output to the light source driving circuit, so that the light source driving circuit adjusts the current value output to the light source to be less than the lighting current value of the light source, ensuring that the light source is in an extinguished state
  • the inherent defects of the hardware of the DLP control circuit are overcome, so that the driving current or driving voltage at the laser end is theoretically 0, and the displayed image to be displayed is pure black, which improves the reliability of the brightness control of the light source component and improves The contrast of the projection screen display.
  • the present application also provides an apparatus for executing instructions by a device, including: a processor, a memory, and a computer program; wherein the computer program is stored in the memory and is configured to be executed by the processor, the computer
  • the program includes instructions for performing the method as described in any of the foregoing embodiments shown in FIG. 8.
  • the present application also provides a computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program, and when the computer program is executed, it is implemented as any one of the foregoing embodiments shown in FIG. 8 Described method.

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Abstract

一种投影显示装置及显示控制方法，当DLP控制电路（1）向光源驱动电路（2）发送的第一控制信号的电压小于或等于预设阈值时，光源驱动电路（2）将第一控制信号调整输出为第二控制信号，第二控制信号用于使光源组件（3）处于熄灭状态。

Description

投影显示装置及其控制方法
本申请要求于2018年12月19日提交中国专利局、申请号为201811556851.9、申请名称为“投影显示装置及其控制方法”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及投影显示技术，尤其涉及一种投影显示装置及其控制方法。
背景技术
目前，随着电子技术的快速发展，电子设备所使用的投影显示装置也出现了越来越多的新技术，能够使投影显示装置向用户所显示的内容愈加丰富、真实。在投影显示技术中，数字光处理(Digital Light Procession，简称：DLP)技术是一种将需要显示的图像经过处理后，再通过向光源驱动电路发送控制信号的方式，使得光源驱动电路根据控制信号指示显示的红、绿、蓝三基色(有时也会使用黄色基色)来控制光源显示的图像的亮度，从而通过数字处理方式提供更清晰的图像画面以及色彩显示。
图1示出了一种DLP投影控制系统原理图，在该电路系统架构中，DLP控制电路是整个投影系统控制的核心。具体地，如图2所示，DLP控制处理部200可以为主控芯片。电源部300为整个DLP控制电路系统供电，以及通过连接激光器驱动电路120来对激光器组件110提供供电。
DLP控制处理部200根据由视频源解码得到的图像信号，生成图像显示使 能信号以及PWM亮度调节信号至激光器驱动电路120，以及，DLP控制处理部200将图像信号输出至光阀210，转换成光阀DMD芯片对应的驱动信号，驱动DMD芯片表面的微小反射镜进行不同角度的翻转。
DLP控制处理部分别通过向发送红色光控制信号R_PWM、绿色光控制信号G_PWM、蓝色光控制信号B_PWM和黄色光控制信号Y_PWM来使得光源显示红色光、绿色光、蓝色光或黄色光。比如，当显示一幅图像画面的红色分量时，DLP控制处理部210输出红色基色光使能信号R_EN，以及红色基色光亮度调节信号R_PWM，至激光器驱动电路120，激光器驱动电路120将上述信号处理后(比如防衰减，以及数模转换)输出至激光器组件110，激光器组件110根据对应的信号发出对应颜色和亮度的红色基色光。与此同步地，光阀210接收到红色分量对应图像显示内容信号，并被对应的驱动信号驱动，从而完成对红色基色光的信号调制。依次类推，DLP控制处理部通过时序性对三基色的输出进行控制，并同步的控制光阀对该颜色进行信号调制，最终经投影镜头成像输出投影画面。
发明内容
本申请提供一种投影显示装置及其控制方法，能够对DLP控制电路用于控制光源组件显示状态的控制信号进行调整，并保证光源组件亮度调整信号的可靠性，并可以使投影显示装置的动态对比度达到最大状态，提高投影显示装置所显示的图像的层次感，提高图像的视觉感受效果。
本申请第一方面提供一种投影显示装置，包括：
DLP控制电路，用于输出图像显示使能信号和亮度调节信号以驱动控制光源 组件；
光源驱动芯片，连接DLP控制电路，用于将上述图像显示使能信号和亮度调节信号传递至光源组件；
光源组件，电连接光源驱动电路，用于根据图像显示使能信号和亮度调节信号进行显示状态的切换；
其中，光源驱动电路包括处理电路和光源驱动芯片，
DLP电路通过处理电路连接光源驱动芯片，并向光源驱动芯片发送第一控制信号，以使光源驱动芯片控制光源组件的显示状态；
当DLP电路通过处理电路向光源驱动芯片发送的第一控制信号的电压小于或等于预设阈值时，处理电路向光源驱动芯片输出第二控制信号，第二控制信号用于使光源驱动芯片控制光源组件处于熄灭状态。
本申请第二方面提供一种投影显示装置的控制方法，包括：
DLP控制电路接收图像显示信号，并输出第一控制信号至光源驱动电路，第一控制信号用于使光源驱动电路控制光源组件的显示状态；
当第一控制信号的电压小于或等于预设阈值时，光源驱动电路接收第一控制信号并输出第二控制信号，第二控制信号用于使光源组件处于熄灭状态；
当第一控制信号的电压大于预设阈值时，光源驱动电路接收并输出第一控制信号至光源组件并使光源组件发光。
本申请第三方面还提供一种投影显示装置的控制方法，包括：
解析待显示图像的画面内容，得到画面内容的至少一种颜色的信号分量；
DLP控制电路输出至少一种颜色的信号分量对应的时序信号和第一亮度调节信号，
光源驱动电路接收时序信号和第一亮度调节信号，并结合时序信号，调节第一亮度调节信号的输出值，其中，第一亮度调节信号数值不为零。
本申请第四方面提供一种设备执行指令的装置，包括：
处理器，存储器以及计算机程序；其中，所述计算机程序被存储在所述存储器中，并且被配置为由所述处理器执行，所述计算机程序包括用于执行如前述第二方面任一项所述的方法的指令。
本申请第五方面提供一种计算机可读存储介质，其特征在于，所述计算机可读存储介质存储有计算机程序，所述计算机程序被执行时，实现如前述第二方面任一项所述的方法。
综上，本申请提供一种投影显示装置及其控制方法，若投影显示装置的DLP控制电路向光源驱动电路发送的第一控制信号电压小于或等于预设阈值时，光源驱动电路向光源组件输出第二控制信号，能够使得投影显示装置在需要显示纯黑色图像时能够根据第二控制信号控制光源驱动电路不会向光源组件输出非零电压，也就能够使得光源驱动电路不会向光源输出超过光源点亮的阈值的电流，进而使得投影显示装置的动态对比度达到最大状态，提高投影显示装置所显示的图像的层次感，提高图像的视觉感受效果。
附图说明
为了更清楚地说明本申请实施例或相关技术中的技术方案，下面将对实施例或相关技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付 出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。
图1为相关技术中DLP控制系统的原理示意图；
图2为本申请实施例提供的DLP投影系统示意图；
图3为本申请提供的投影显示装置的一示例性光源驱动电路示意图；
图4为一种投影显示装置的光源驱动的电路连接结构示意图；
图5为本申请提供的投影显示装置一示例性的电路结构示意图；
图6为本申请提供的投影显示装置一示例性的电路结构示意图；
图7为本申请提供的投影显示装置示例性技术效果的示意图；
图8为本申请提供的投影显示装置的示例性控制方法的流程示意图；
图9为本申请提供的投影显示装置的示例性时序控制图；
图10为本申请提供的投影显示装置的示例性控制方法的流程示意图。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
本申请的说明书和权利要求书及上述附图中的术语“第一”、“第二”、“第三”、“第四”等(如果存在)是用于区别类似的对象，而不必用于描述特定的顺序或先后次序。应该理解这样使用的数据在适当情况下可以互换，以便这里描述的本申请的实施例例如能够以除了在这里图示或描述的那些以外的顺序实施。此外，术语“包括”和“具有”以及他们的任何变形，意图在于覆盖不排 他的包含，例如，包含了一系列步骤或单元的过程、方法、系统、产品或设备不必限于清楚地列出的那些步骤或单元，而是可包括没有清楚地列出的或对于这些过程、方法、产品或设备固有的其它步骤或单元。
图2为本申请实施例提供的投影系统架构示意图。如图2所示，在使用DLP技术的投影系统架构中，在对需要显示的图像经过图像信号解码、FPGA对图像进行的图像timing转换以及信号格式转换后，DLP控制电路根据需要显示的目标图像的内容，通过向光源驱动电路发送控制信号的方式，使得光源驱动电路对光源所发出的颜色和亮度进行控制，最终由光源根据光源驱动电路的控制，将目标图像的颜色信息、亮度信息在数字微透镜装置(Digital Micromirror Device，简称：DMD)成像器件上进行时序显示，最终的图像经过镜头放大后进行投射，从而实现目标图像的显示。上述实施例的投影系统架构能够实现投影画面较佳的对比度显示。下面将根据具体示例进行说明。
由于在图1所示的相关技术中，DLP控制处理部需要分别通过向光源驱动电路发送红色光控制信号R_PWM、绿色光控制信号G_PWM、蓝色光控制信号B_PWM和黄色光控制信号Y_PWM来控制光源显示红色光、绿色光、蓝色光或黄色光。而当DLP控制电路处理一副纯黑色图像时，需要DLP控制电路将R_PWM、G_PWM、B_PWM和Y_PWM均设置为电压为0V的控制信号后向光源驱动电路发送。但是，相关技术中，DLP控制电路以及光源驱动电路通常是集成芯片形式设置在投影显示装置中，为了保证芯片工作的可靠性，不会在DLP控制电路和光源驱动电路之间传输的电压为0V的信号，也就导致了DLP控制电路如果需要向光源驱动电路发送的电压为0V的控制信号，DLP控制电路实际向光源驱动电路输出的控制信号R_PWM、G_PWM、B_PWM和Y_PWM 的电压可能被配置为电压略大于0V。
因此，在如图1所示的相关技术中，比如当DLP控制电路需要显示一副纯黑色图像或者需要显示的图像中某个颜色的控制信号的电压需要为0V时，由于投影显示装置中控制系统的配置，DLP控制电路实际向光源驱动电路发送的控制信号R_PWM、G_PWM、B_PWM或Y_PWM的电压并不是0V。一旦控制信号的电压略大于0V并施加在光源驱动电路上后，容易又会使得光源驱动电路向光源输出电流。而这种非零信号的可控性较差，如果光源驱动电路向光源输出的电流大于将光源点亮的阈值电流时，这会导致激光器组件被迫点亮，而整个光源就会输出某种基色某种程度亮度的光束，最终使得投影所显示的图像就不是黑色的图像，会使得投影显示装置的动态对比度并不是最大状态，影响投影显示装置所显示的图像的层次感，降低图像的视觉感受效果。其中，动态对比度的定义为：一帧画面中白色图像信息和黑色图像信息之比，通过提高图像的动态对比度，可以增强图像的层次感，使得图像给人更加鲜明的视觉感受，因此有必要改善显示装置的动态对比度，使得在投影显示装置允许的范围内实现动态对比度的最大化。并且这种非零信号的输出现象，也给电路控制带来了不稳定性，不利于控制电路的可靠性。
本申请实施例图2提供的DLP投影系统架构中，设置了处理电路，通过对设置的处理电路判断投影显示装置的DLP控制电路向光源驱动电路发送的第一控制信号电压小于或等于预设阈值时，向光源驱动电路输出第二控制信号，从而使得显示装置在需要显示纯黑色图像时能够根据第二控制信号控制光源驱动电路不会向光源输出电压，也就能够使得光源驱动电路不会向光源输出超过光源点亮的阈值的电流，进而使得投影显示装置的动态对比度达到最大状态，提 高投影显示装置所显示的图像的层次感，提高图像的视觉感受效果。
下面以具体示例对本申请的技术方案进行详细说明。下面这几个具体的实施例可以相互结合，对于相同或相似的概念或过程可能在某些实施例不再赘述。
图3为本申请提供的投影显示装置一实施例的驱动结构示意图。如图3所示，本实施例提供的投影显示装置包括：DLP控制电路1、光源驱动电路2和光源组件3，其中光源驱动电路2包括处理电路21和光源驱动芯片22。
DLP控制电路1用于通过处理电路21向光源驱动芯片22发送控制信号，以使光源驱动芯片22根据控制信号控制光源组件3的显示状态。所述的显示状态包括：光源的点亮或熄灭、光源每个颜色的亮度等。处理电路21设置在DLP控制电路1和光源驱动芯片22之间，用于对DLP控制电路1向光源驱动芯片22发送的控制信号进行处理。
其中，处理电路21具体用于若判断DLP控制电路1向光源驱动3发送的第一控制信号的电压若小于或等于预设阈值时，则处理电路21控制不向光源驱动芯片22输出所接收到的第一控制信号，而是向光源驱动芯片22输出第二控制信号，其中，第二控制信号用于使光源驱动芯片22控制光源组件3处于熄灭状态；而当第一控制信号的电压大于预设阈值，则处理电路21控制向光源驱动芯片22输出DLP控制电路1所发送的第一控制信号。
在一具体实施例中，本实施例中所述的DLP控制电路1向光源驱动芯片22发送的第一控制信号可以包括用于控制光源驱动芯片对应的光源分别显示红色光、绿色光、蓝色光或黄色光的红色光控制信号R_PWM、绿色光控制信号G_PWM、蓝色光控制信号B_PWM，以及在一些实施例中，还可以包括黄色光控制信号Y_PWM。则所述的预设阈值为显示装置中DLP控制电路1需要向光 源驱动芯片22发送电压为0V的控制信号时，由于DLP投影控制系统的工作机制，实际发送的电压大于0V的第一控制信号的电压值。则在一具体实施例中，第二控制信号可以是任何用于向光源驱动芯片22指示将光源组件3处于熄灭状态的控制信号。例如：第二控制信号可以是电压为0V的控制信号；或者，第二控制信号可以是用于向光源驱动芯片22指示第一控制信号的电压为0V的信号；本实施例后续以第二控制信号为电压为0V的控制信号为例进行说明，而并不作为对其进行的限定。
例如，DLP控制电路1需要控制光源组件3熄灭时，向光源驱动芯片22发送电压为0的第一控制信号，由于投影显示装置为了其工作的可靠性，会将实际DLP控制电路1向光源驱动芯片22发送的第一控制信号配置为0.1V。而该0.1V的第一控制信号施加在光源驱动芯片22上时，会使得光源驱动芯片22向光源输出的电流为0.05A大于将光源点亮的阈值电流例如0.03A，进而导致光源驱动芯片22应该在收到控制光源组件3其熄灭的第一控制信号时，实际却根据第一控制信号将光源组件3点亮，影响光源所显示的图像的动态对比度以及显示效果。因此，本实施例中可以将预设阈值设置为0.1V，则当第一控制信号的电压小于或等于0.1V时，说明第一控制信号是用于控制光源组件3熄灭的信号，则不论第一控制信号的电压作用在光源驱动芯片22上时向光源组件3输出的电流是否大于光源组件3点亮的预设阈值，控制电路2都会向光源驱动芯片22输出电压值为0V的第二控制信号，使得电压值为0V第二控制信号作用在光源驱动芯片22上时候，能够使得光源驱动芯片22根据第二控制信号向光源组件3输出的信号电流为0A，使得光源组件3处于熄灭状态。从而能够防止原本被DLP控制电路1控制熄灭的光源组件3，由于投影显示装置的配置原因 在应该熄灭时被点亮，进而提高投影显示装置的动态对比度以及显示效果，并且这也提高了光源组件亮度控制的可靠性。
具体地，本实施例提供的处理电路21具体用于获取DLP控制电路1向光源驱动芯片22发送的第一控制信号后，判断第一控制信号的电压是否小于或等于预设阈值。其中，处理电路21可以是设置在DLP控制电路1和光源驱动芯片22之间的电路，DLP控制电路1向光源驱动芯片22所发送的信号都会经过处理电路21，并由处理电路21进行判断。
若处理电路21判断第一控制信号的电压小于或等于预设阈值后，处理电路21还用于向光源驱动芯片22输出第二控制信号。其中，所述第二控制信号可以是电压为0V的信号。
而若处理电路21判断第一控制信号的电压大于预设阈值后，处理电路21还用于向光源驱动芯片22输出第一控制信号。其中，处理电路21可以获取第一控制信号后，直接将所获取的第一控制信号向光源驱动芯片22输出；或者，处理电路21可以获取第一控制信号后，向光源驱动芯片22输出与第一控制信号电压数值相同的控制信号，使得光源驱动芯片22通过处理电路21接收到与第一控制信号电压相同的控制信号。
在一具体实施例中，处理电路21可以通过内部的比较器以及逻辑电路器件向光源驱动芯片22输出第一控制信号或第二控制信号。例如：当处理电路21判断第一控制信号的电压小于或等于预设阈值后，可向比较器和逻辑电路器件发送第一电平信号，比较器和逻辑电路器件接收到第一电平信号后，向光源驱动芯片22输出第二控制信号；而当处理电路21判断第一控制信号的电压大于预设阈值后，可向比较器和逻辑电路器件发送第二电平信号，比较器和逻辑电 路器件接收到第二电平信号后，向光源驱动芯片22输出第一控制信号。
综上，本实施例提供的投影显示装置，若显示装置的DLP控制电路向光源驱动芯片发送的第一控制信号电压小于或等于预设阈值时，处理电路能够向光源驱动芯片输出第二控制信号，使得投影显示装置在需要显示纯黑色图像时能够根据第二控制信号控制光源驱动芯片不会向光源输出电压，也就能够使得光源驱动芯片不会向光源输出超过光源点亮的阈值的电流，从而能够防止原本被DLP控制电路控制熄灭的光源由于投影显示装置的配置原因在应该熄灭时被点亮，一方面提高了光源组件亮度控制的可靠性，并且能够使得投影显示装置的动态对比度达到最大状态，提高投影显示装置所显示的图像的层次感，提高图像的视觉感受效果。其中，本实施例提供的投影显示装置具体通过降低所显示的黑色图像信息从而实现了提高显示装置的动态对比度。
进一步地，在如图4所示的实施例基础上，本申请实施例还提供了两种投影显示装置中处理电路具体的电路结构。其中，由于相关技术中DLP控制电路1向光源驱动电路3所发送的控制信号有两种类型，一种是用于控制光源显示的颜色控制信号，例如R_PWM、G_PWM、B_PWM和Y_PWM；另一种是用于控制光源的占空比信号，例如：PWM占空比(Duty)信号。
在一具体实施例中，图4为一种投影显示装置的光源驱动的电路连接结构示意图。在如图4所示的实施例中，示出了光源驱动芯片N2一种电路连接方式。其中，对于光源驱动芯片N2通过控制管脚VCTRL所获取的控制信号电压不为0时，控制信号的电压会加载在光源驱动芯片N2所连接的采样电阻R8上，而对于图中的采样电阻R8也就会根据公式获得对应的电流值Ilaser。其中，Vctrl为光源驱动芯片N2的控制管脚CTRL的电压，R8为采样电阻的阻值， LD_PWM_IN为DLP控制电路向光源驱动芯片N2发送的第一控制信号。则当Ilaser大于光源的点亮的电流阈值，就会使光源组件3在应该熄灭时被点亮。则本实施例提供的DLP控制电路1通过处理电路21向光源驱动电路3发送控制信号或者占空比信号两种信号的设置，防止原本被DLP控制电路1的控制信号控制熄灭的光源组件3，由于显示装置的配置原因在应该熄灭时被点亮。下面对上述两种电路结构结合图5和图6分别进行说明。
图5为本申请提供的投影显示装置一实施例的电路结构示意图。如图5所示的实施例中，DLP控制电路1向光源驱动芯片N2发送的第一控制信号，光源驱动芯片N2通过控制管脚CTRL1接收DLP控制电路1发送的控制信号(第一控制信号或第二控制信号)。本实施例中设置的处理电路设置在DLP控制电路1的输出端以及光源驱动芯片N2的控制管脚CTRL1之间，将处理电路21所获取的DLP控制电路1输出的第一控制信号记为LD_PWM_IN，并将处理电路21实际向光源驱动芯片N2的控制管脚CTRL1发送的控制信号记为LD_PWM_OUT。
如图5所示的实施例提供的处理电路21包括：电压比较器N3。其中，电压比较器N3的第一输入端IN-用于接收DLP控制电路1输出的第一控制信号LD_PWM_IN，电压比较器N3的第二输入端IN+用于接收电压为所述预设阈值的对比信号Vref。电压比较器N3用于比较所述第一控制信号LD_PWM_IN的电压和所述对比信号Vref的电压。并且若第一控制信号的LD_PWM_IN电压小于或等于对比信号Vref的电压，电压比较器N3的输出端VOUT向选择器N8输出第一电平信号，第一电平信号用于控制选择器N8向所述光源驱动芯片N2 的控制管脚CTRL1输出第二控制信号；若第一控制信号LD_PWM_IN的电压大于对比信号Vref的电压，电压比较器N3的输出端VOUT向选择器N8输出第二电平信号，第二电平信号用于控制选择器N8向光源驱动芯片N2的控制管脚CTRL1输出第一控制信号。
如图5所示的实施例提供的处理电路还包括：选择器N8。其中，选择器N8的第一输入端B1用于接收第一控制信号LD_PWM_IN，选择器N8的第二输入端B2接地；选择器N8的选择端S用于接收电压比较器N3输出的第一电平信号或第二电平信号。并且若选择器N8的选择端S收到电压比较器N3发送的第一电平信号，则选择器N8的输出端A向所述光源驱动芯片N2的控制管脚CTRL1输出第二控制信号；若选择器N8的选择端S收到电压比较器N3发送的第二电平信号，则选择器N8的输出端A向光源驱动芯片N2的控制管脚CTRL1输出第一控制信号。
则在如图5所示的电路中，电压比较器N3和选择器N8的状态可参照表1和表2所示。当输入电压比较器N3的第一控制信号LD_PWM_IN的电压小于或等于对比信号Vref的电压，电压比较器N3的输出端VOUT向选择器N8输出的第一电平信号为低电平信号，所述低电平信号的电压为0V，则选择器N8的选择端S收到低电平信号后，选择器N8的输出端A向所述光源驱动芯片N2的控制管脚CTRL1输出的第二控制信号是电压为0V的控制信号。
当输入比较器N3的第一控制信号LD_PWM_IN的电压大于对比信号Vref的电压，电压比较器N3的输出端VOUT向选择器N8输出的第二电平信号为高电平信号，所高电平信号的电压为5V，则选择器N8的选择端S收到高电平信号后，选择器N8的输出端A向所述光源驱动芯片N2的控制管脚CTRL1输出 所接收到的的第一控制信号LD_PWM_IN。
表1
N3状态
N3输出电压
N3输入电压  VOUT VS＝VOUT
LD_PWM_IN＞Vref 5V高电平
LD_PWM_IN<Vref 0V低电平
表2
N8状态
S引脚输入电压VS A引脚输出电压
高电平 VA＝VB1＝LD_PWM_IN
低电平 VA＝VB2＝0V
图6为本申请提供的投影显示装置另一实施例的电路结构示意图；如图6所示的实施例中设置的控制电路同样设置在DLP控制电路1的输出端以及光源驱动芯片N2的占空比管脚PWM之间，并用于根据所获取的DLP控制电路1向光源驱动芯片N2所发送的第一控制信号LD_PWM_IN与预设的对比信号Vref的电压进行对比后，向光源驱动芯片N2的占空比管脚PWM发送占空比信号。
如图6所示的电压比较器N136的设置方式以及工作原理与图5中所示的电压比较器N3相同，不再赘述。所不同之处在于如图6所示的实施例中，处理电路还包括：与门电路N135。其中，与门电路N135的第一输入端PIN1用于 接收所述第一控制信号的占空比信号LD_DUTY_R_INPUT，与门电路N135的第二输入端PIN2用于接收所述与门电路N135输出的第一电平信号或第二电平信号。并且若与门电路N135的第二输入端PIN2收到第一电平信号，与门电路N135用于将所述第一电平信号和第一控制信号的占空比信号LD_DUTY_R_INPUT进行与运算后，输出至光源驱动芯片N2的占空比管脚PWM；若与门电路N135的第二输入端PIN2接收到第二平信号，与门电路N135用于将第二电平信号和第一控制信号的占空比信号LD_DUTY_R_INPUT进行与运算后，输出至所述第二引脚。
表3
N136状态
N136输出电压
N136输入电压VOUT N136输出引脚VOUT＝N135
的第二输入端PIN2
LD_PWM_IN＞Vref 高电平
LD_PWM_IN<Vref 低电平
表4
N135状态
N135第二输入端PIN2 N135第一输入端PIN1N135输出端PIN3
高电平 LD_DUTY_R_INPUT
LD_DUTY_R
低电平 低电平0V
则在如图6所示的电路中，电压比较器N136和与门电路N135的状态可参 照表3和表4所示。当输入电压比较器N136的第一控制信号LD_PWM_IN的电压小于或等于对比信号Vref的电压，电压比较器N136的输出端VOUT向与门电路N135输出的第一电平信号为低电平信号，低电平信号的电压为0V，则与门电路N135的PIN2收到低电平信号后，与门电路N135的输出端PIN3向光源驱动芯片N2的占空比管脚PWM输出的第二控制信号是将第一控制信号的占空比信号LD_DUTY_R_INPUT与低电平信号进行相与计算后得到的0V的低电平占空比信号。
而当输入比较器N3的第一控制信号LD_PWM_IN的电压大于对比信号Vref的电压，电压比较器N3的输出端VOUT向与门电路N135输出的第二电平信号为高电平信号，则与门电路N135的PIN2收到高电平信号后，与门电路N135的输出端PIN3向所述光源驱动芯片N2的占空比管脚PWM输出的第一控制信号，是将第一控制信号的占空比信号LD_DUTY_R_INPUT与高电平信号进行相与计算后得到的占空比信号LD_DUTY_R。
综上，在如图5或图6所提供的控制电路的实施例，能够实现的技术效果如图7所示，其中，图7为本申请提供的投影显示装置技术效果的示意图。在图7所示的左侧坐标系中，示出了相关技术中，DLP控制电路向光源驱动电路发送的第一控制信号LD_PWM_IN的电压示意图，其中当第一控制信号的电压小于对比电压Vref时并不会出现电压为0的情况。而通过本实施例中在加入DLP控制电路与光源驱动芯片之间的处理电路后，通过处理电路的处理，使得DLP控制电路通过处理电路向光源驱动芯片所发送的第一控制信号的电压在小于对比电压Vref时，处理电路实际向光源驱动芯片发送电压为0V的第二控制 信号。进而能够使得显示装置在需要显示纯黑色图像时能够根据电压为0V的第二控制信号控制光源驱动电路不会向光源输出电压，也就能够使得光源驱动电路不会向光源输出超过光源点亮的阈值的电流，从而能够防止原本被DLP控制电路控制熄灭的光源由于显示装置的配置原因在应该熄灭时被点亮，提高了光源组件亮度控制的可靠性，并且使得投影显示装置的动态对比度达到最大状态，提高投影显示装置所显示的图像的层次感，提高图像的视觉感受效果。
图8为本申请提供的投影显示装置的控制方法一实施例的流程示意图。本示例的控制方法应用DLP投影显示装置，该DLP投影显示装置包括，DLP控制电路，光源驱动电路和光源组件，如图8所示，本实施例提供的投影显示装置的控制方法包括：
S101：DLP控制电路接收图像显示信号，并输出第一控制信号至光源驱动电路，第一控制信号用于使光源驱动电路控制光源组件的显示状态；
对应图2所示的DLP投影控制系统架构，在实施上述方法时，DLP控制电路输出图像信号基色光的使能DUTY信号，以及对应基色光的PWM亮度调节信号给光源驱动电路，在具体实施中，光源包括激光器组件，或者激光器组件和波长转换装置，波长转换装置发光也是通过对激光器组件的驱动来间接控制。因此，光源驱动电路具体为激光器组件的驱动电路。光源驱动电路中的控制芯片具有输入引脚，比如图4所示的光源驱动芯片的CTRL1引脚，以及CTRL2引脚，分别用于接收将用于实际输出至激光器组件的PWM亮度调节信号和使能信号。
图5或图6所示例的处理电路设置于DLP控制电路的输出端和光源驱动电 路的输入端之间，具体地，图5或图6所示例的处理电路至少用于接收DLP控制电路输出的某基色的PWM亮度调节信号。上述第一控制信号对应于某基色光的PWM亮度调节信号。
S102：当第一控制信号的电压小于或等于预设阈值时，光源驱动电路接收上述第一控制信号并输出第二控制信号，第二控制信号用于使光源组件处于熄灭状态；
与基色光的PWM亮度调节信号对应的第一控制信号经过图5或图6所示例的处理电路后，处理电路内部的电压比较器等组成的电路会根据输入信号输出对应的输出控制信号。在满足上述条件时，该输出控制信号具体为第二控制信号，该第二控制信号具体可以为数值为零的电压信号。该第二控制信号输出至图4所示的光源驱动芯片N2的CTRL1引脚，成为实际要输出给激光器组件的PWM亮度调节信号。
S103：当上述第一控制信号的电压大于预设阈值时，光源驱动电路接收并输出该第一控制信号至光源组件，并使光源组件发光。
与步骤S103处理原理相同，利用处理电路中的电压比较器等组成的电路根据输入信号输出对应的输出控制信号，在满足上述条件时，输出控制信号具体为该处理电路所输入的第一控制信号。同理地，该第一控制信号输出至图4所示的光源驱动芯片N2的CTRL1引脚，成为实际要输出给激光器组件的PWM亮度调节信号。
需要说明的是，上述步骤102，步骤103并没有时序上的先后顺序，而是在满足不同的输入条件时，具有不同的处理结果。
本实施例提供的投影显示装置的控制方法的实现方式与原理与如图3所示 的投影显示装置实现方式与原理相同，不再赘述。
图10为本申请提供的投影显示装置的控制方法另一实施例的流程示意图。
该方法实施例应用于DLP投影显示装置，其中该DLP投影显示装置包括DLP控制电路，光源驱动电路和光源组件，如图10所示，本实施例提供的投影显示装置的控制方法包括：
S201：解析待显示图像的画面内容，得到所述画面内容的至少一种颜色的信号分量。
具体地，如图10所示实施例中提供的投影显示装置的控制方法，能够应用于如图2所示的使用DLP技术的投影显示装置，当该投影显示装置还包括编解码电路和FPGA算法处理电路等，能够对待显示图像进行解码，并将解码后的图像信号输出至DLP控制电路，通过DLP控制电路对待显示的图像的画面内容进行处理后，能的到用于表示该待显示图像的画面内容的至少一种颜色的信号分量，例如：投影显示装置能够确定三基色的信号分量的灰阶值。
S202：DLP控制电路输出上述至少一种颜色的信号分量对应的时序信号和第一亮度调节信号。
图9示出了一种投影显示装置的三基色光时序控制示例图。
由于红、绿、蓝为图像显示使用的三原色，在本示例的DLP投影显示装置中，使用一个光阀部件，三基色是时序照射至光阀部件上，光阀根据图像分解得到的三基色分量显示信号对三种基色的光束分别进行调制，以便进入投影镜头成像。
如图9所示，当红色显示信号分量的对应的时序信号R_EN有效时，绿色 和蓝色显示信号分量对应的时序信号均为无效状态。需要说明的是，此处的有效是指时序信号为高电平(在电路控制中，通常高电平为有效信号)，用于允许该种基色光在一个输出周期内的某一个特定时段内输出。而无效是指在该种基色光在一个输出周期内、除了某特定时段外的时间段内是不允许输出的。
为了方便介绍对光源组件的控制，光源组件可包括红色激光器，绿三色激光器和蓝色激光器三种激光光源。
当时序信号R_EN有效时，此时允许红色激光器点亮，而不允许蓝色激光器和绿色激光器点亮，而具体地红色激光器的发光亮度则由亮度调节信号PWM信号，即步骤S202中的第一亮度调节信号来确定，此图示中未体现。
同理地，当蓝色显示信号分量对应的时序信号B_EN有效时，允许蓝色激光器点亮，而红色激光器和绿色激光器不允许点亮。具体点亮的数值仍由对应的PWM亮度调节信号来确定。
而当蓝色激光器的时序信号B_EN无效时，即表示理论设计上不允许蓝色激光器点亮。而此时，对应蓝色激光器的亮度调节信号应为零值。
S203：光源驱动电路接收时序信号和第一亮度调节信号，并结合时序信号，调整第一亮度调节信号的输出值，其中，所述第一亮度调节信号数值不为零。
具体地，光源驱动电路结合时序信号，调整第一亮度调节信号的输出值可以具体为：
当时序信号为无效信号，且第一亮度调节信号不满足预设条件时，光源驱动电路输出第二亮度调节信号，所述第二亮度调节信号用于使所述光源驱动芯片调节向所述光源输出的电流值小于所述光源组件的点亮电流值。
其中，在本示例提供的方法中，以待显示图像的颜色为全黑的情况为例， 对于一张全黑的图像，S101中所确定的至少一个颜色的信号分量的灰阶值都为0，并且S202中所确定的第一亮度调节信号的电压值也为0。但是由于相关技术中，DLP控制电路以及光源驱动电路通常是集成芯片形式设置在投影显示装置中，为了保证芯片工作的可靠性，不会在DLP控制电路和光源驱动电路之间传输的电压为0V的信号，也就会导致第一亮度调节信号电压值可能不为0。
因此，本实施例在S203中优选地，在当前图像为纯黑图像时，若第一亮度调节信号不满足预设条件，则光源驱动电路处理后输出第二亮度调节信号，从而光源驱动电路调整向光源输出的电流值小于光源的点亮电流值，确保光源处于熄灭状态，达到一种图像显示时无光束出射的情况，图像显示为全黑。
例如：S203中可以通过第一亮度调节信号的电压是否在预设数值范围内进行判断，上述预设条件可以为电压预设数值范围。
若第一亮度信号的电压值落在预设范围内，则确定第一亮度调节信号满足预设条件，即第一亮度信号对应纯黑色的待显示图像显示所需的激光器的亮度调节信号，则向光源驱动电路输出第一亮度调节信号以给激光器提供驱动信号。
若第一亮度信号的电压值不在预设范围内，则向光源驱动电路输出第二亮度调节信号，使得光源驱动电路调整向光源输出的电流值小于光源的点亮电流值，确保光源处于熄灭状态，这样克服DLP控制电路硬件本身的固有缺陷，使得激光器端的驱动电流或驱动电压为理论上的0值，而所显示的待显示图像为纯黑，提高了光源组件亮度控制的可靠性，并且提高了投影画面显示的对比度。
本申请还提供一种设备执行指令的装置，包括：处理器，存储器以及计算机程序；其中，所述计算机程序被存储在所述存储器中，并且被配置为由所述 处理器执行，所述计算机程序包括用于执行如前述图8所示实施例中任一项所述的方法的指令。
本申请还提供一种计算机可读存储介质，其特征在于，所述计算机可读存储介质存储有计算机程序，所述计算机程序被执行时，实现如前述图8所示实施例中任一项所述的方法。
本领域普通技术人员可以理解：实现上述各方法实施例的全部或部分步骤可以通过程序指令相关的硬件来完成。前述的程序可以存储于一计算机可读取存储介质中。该程序在执行时，执行包括上述各方法实施例的步骤；而前述的存储介质包括：ROM、RAM、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅是本申请的较佳实施例而已，并非对本申请作任何形式上的限制，依据本申请的技术实质对以上实施例所作的任何简单修改、等同变化与修饰，均仍属于本申请技术方案的范围内。
最后应说明的是：以上各实施例仅用以说明本申请的技术方案，而非对其限制；尽管参照前述各实施例对本申请进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分或者全部技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例技术方案的范围。

Claims (12)

  1. 一种投影显示装置，其特征在于，包括：
    DLP控制电路，用于输出图像显示使能信号和亮度调节信号以驱动控制光源组件；
    光源驱动芯片，连接所述DLP控制电路，用于将上述图像显示使能信号和亮度调节信号传递至光源组件；
    光源组件，电连接所述光源驱动电路，用于根据图像显示使能信号和亮度调节信号进行显示状态的切换；
    其中，所述光源驱动电路包括处理电路和光源驱动芯片，
    所述DLP电路通过所述处理电路连接所述光源驱动芯片，并向所述光源驱动芯片发送第一控制信号，以使所述光源驱动芯片控制所述光源组件的显示状态；
    当所述DLP电路通过所述处理电路向所述光源驱动芯片发送的第一控制信号的电压小于或等于预设阈值时，所述处理电路向所述光源驱动芯片输出第二控制信号，所述第二控制信号用于使所述光源驱动芯片控制所述光源组件处于熄灭状态。
  2. 根据权利要求1所述的投影显示装置，其特征在于，
    若所述第一控制信号的电压大于所述预设阈值，所述处理电路用于向所述光源驱动芯片输出所述第一控制信号。
  3. 根据权利要求2所述的投影显示装置，其特征在于，
    所述第二控制信号的电压为0V。
  4. 根据权利要求3所述的投影显示装置，其特征在于，
    所述光源驱动芯片用于，根据所述第二控制信号控制向所述光源输出的信号电流为0A，以使所述光源处于熄灭状态。
  5. 根据权利要求1-4任一项所述的投影显示装置，其特征在于，
    所述处理电路包括：电压比较器；
    所述电压比较器的第一输入端用于接收所述第一控制信号，所述电压比较器的第二输入端用于接收电压为所述预设阈值的对比信号；
    所述电压比较器用于比较所述第一控制信号和所述对比信号的电压；
    若所述第一控制信号的电压小于或等于所述对比信号的电压，所述电压比较器的输出端输出第一电平信号；所述第一电平信号用于控制所述处理电路向所述光源驱动芯片输出第二控制信号；
    若所述第一控制信号的电压大于所述对比信号的电压，所述电压比较器的输出端输出第二电平信号；所述第二电平信号用于控制所述处理电路向所述光源驱动芯片输出所述第一控制信号。
  6. 根据权利要求5所述的投影显示装置，其特征在于，所述处理电路还具体用于，
    向所述光源驱动芯片的第一引脚输出所述第一控制信号或所述第二控制信号；
    其中，所述第一引脚为所述光源驱动芯片接收所述第一控制信号的引脚。
  7. 根据权利要求5所述的投影显示装置，其特征在于，
    所述处理电路还包括：选择器；
    所述选择器的第一输入端用于接收所述第一控制信号，所述选择器的第二输入端接地，所述选择器的选择端用于接收所述第一电平信号或第二电平信号；
    若所述选择器的选择端收到所述第一电平信号，所述选择器的输出端输出所述第二输入端的接地信号；
    若所述选择器的选择端收到所述第二电平信号，所述选择器的输出端输出所述 第一控制信号。
  8. 根据权利要求5所述的投影显示装置，其特征在于，所述处理电路还具体用于，
    向所述光源驱动芯片的第二引脚输出所述第一控制信号或所述第二控制信号；
    其中，所述第二引脚为所述光源驱动芯片接收所述第一控制信号的占空比信号的引脚。
  9. 根据权利要求8所述的投影显示装置，其特征在于，
    所述处理电路还包括：与门电路；
    所述与门电路的第一输入端用于接收所述第一控制信号的占空比信号，所述与门电路的第二输入端用于接收所述第一电平信号或第二电平信号；
    若所述与门电路的第二输入端收到所述第一电平信号，所述与门电路用于将所述第一电平信号和所述第一控制信号的占空比信号进行与运算后，输出至所述第二引脚；
    若所述与门电路的第二输入端收到所述第二电平信号，所述与门电路用于将所述第二电平信号和所述第一控制信号的占空比信号进行与运算后，输出至所述第二引脚。
  10. 一种投影显示装置的控制方法，应用于DLP投影显示装置，所述DLP投影显示装置包括DLP控制电路，光源驱动电路和光源组件，其特征在于，包括：
    DLP控制电路接收图像显示信号，并输出第一控制信号至所述光源驱动电路，所述第一控制信号用于使光源驱动电路控制光源组件的显示状态；
    当所述第一控制信号的电压小于或等于所述预设阈值时，所述光源驱动电路接收所述第一控制信号并输出第二控制信号，所述第二控制信号用于使所述光源 组件处于熄灭状态；
    当所述第一控制信号的电压大于所述预设阈值时，所述光源驱动电路接收并输出所述第一控制信号至所述光源组件并使所述光源组件发光。
  11. 一种投影显示装置的控制方法，应用于DLP投影显示装置，所述DLP投影显示装置包括DLP控制电路，光源驱动电路和光源组件，其特征在于，包括：
    解析待显示图像的画面内容，得到所述画面内容的至少一种颜色的信号分量；
    DLP控制电路输出所述至少一种颜色的信号分量对应的时序信号和第一亮度调节信号，
    光源驱动电路接收所述时序信号和所述第一亮度调节信号，并结合所述时序信号，调节所述第一亮度调节信号的输出值，其中，所述第一亮度调节信号数值不为零。
  12. 根据权利要求11所述的投影显示装置的控制方法，其特征在于，所述光源驱动电路结合所述时序信号，调节所述第一亮度调节信号的输出值，可以具体为：
    当所述时序信号为无效信号，且所述第一亮度调节信号不满足预设条件时，所述光源驱动电路输出第二亮度调节信号，所述第二亮度调节信号用于使所述光源驱动芯片调节向所述光源输出的电流值小于所述光源组件的点亮电流值。
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