Bottom plate controller for controlling LCOS (Liquid Crystal On Silicon) and micro light-emitting diode display screen and display device
By introducing a display pixel array, a programmable processing unit array, and a capacitor array into the baseboard controller, the problem of compatibility between Micro LED and LCOS display driving control was solved, enabling stable driving and switching of the two types of displays.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- XDMICRO (ZHONGSHAN) OPTOELECTRONIC SEMICON CO LTD
- Filing Date
- 2026-01-08
- Publication Date
- 2026-04-28
AI Technical Summary
Existing baseboard controllers cannot simultaneously drive and control both Micro LED and LCOS displays.
A baseboard controller is provided, comprising a display pixel array, a programmable processing unit array, and a capacitor array. The programmable processing unit array adjusts the pulse width of the pixels, and the capacitor array stabilizes the driving voltage to achieve driving control of LCOS and Micro LED displays.
It achieves stable driving of LCOS and Micro LED displays, can switch between different displays, provides stable driving current, and ensures continuous and stable operation of the display.
Smart Images
Figure CN121938318A_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of display technology, and in particular relates to a baseboard controller and display device for controlling LCOS and micro light-emitting diode displays. Background Technology
[0002] Liquid Crystal on Silicon (LCOS) display technology is a reflective micro-display technology based on liquid crystal on silicon (LCOS). It integrates LCD liquid crystal and CMOS integrated circuit, and is mainly used in optical projection systems, high-definition television (HDTV), head-mounted display devices (HMD), and automotive display fields (such as HUD, instrument panel, and center console). Its core adopts a silicon substrate integrated CMOS driving circuit, combined with aluminum reflective electrodes and off-axis optical design. It achieves optical path separation through polarizing beam splitter, concave reflective mirror architecture, and polarizing film, which can meet the display requirements of high light efficiency and high resolution.
[0003] With the continuous development of technology, Micro LED displays, due to their realistic colors and rich details, are widely used in augmented reality display devices. However, Micro LEDs are current-driven light-emitting devices, which differ from voltage-driven light-emitting devices such as LCOS.
[0004] How to provide a baseboard controller that can drive and control both Micro LED displays and LCOS displays is a technical problem that urgently needs to be solved. Summary of the Invention
[0005] This application provides a baseboard controller and display device for controlling LCOS and micro LED displays, aiming to solve the problem that current baseboard controllers cannot simultaneously control the driving of micro LED displays and LCOS displays.
[0006] In a first aspect, embodiments of this application provide a baseboard controller for controlling LCOS and micro-light-emitting diode displays, comprising: Display pixel array; A programmable processing unit array; the programmable processing unit array is configured to execute an instruction sequence, and the programmable processing unit array adjusts the control pulse width corresponding to the display pixels in the display pixel array to adjust the display brightness of the pixels by executing the instruction sequence, and the instruction sequence is generated by the programmable processing unit according to the display data; A capacitor array is connected to the display pixel array to stabilize the driving voltage of the display pixel array.
[0007] In one implementation of the first aspect, the display pixel array is a multi-primary-color display pixel array or a monochrome display pixel array.
[0008] In one implementation of the first aspect, the display pixel array is a silicon-based liquid crystal pixel array, and the programmable processing unit is configured to generate a corresponding pulse width modulation signal according to the display data, and to drive the silicon-based liquid crystal pixels with voltage through the pulse width modulation signal.
[0009] In one implementation of the first aspect, the display pixel array is a micro-light-emitting diode pixel array, and the programmable processing unit is configured to generate a corresponding pulse width modulation signal and adjust the current density of the micro-light-emitting diode pixels according to the display data. The pulse width modulation signal is used to control the on-time of the micro-light-emitting diode pixels under the controlled current density.
[0010] In one implementation of the first aspect, the display pixel array is a monochrome display array, the display data is converted into luminance component data of an image, and the programmable processing unit is configured to determine the pulse width of a pulse width modulation signal based on the luminance component data of the image.
[0011] In one implementation of the first aspect, the display pixel array is a multi-primary-color display array, the display data includes the color component data of the image and the display order, and the programmable processing unit is configured to determine the pulse width of the corresponding pulse width modulation signal and the bus selection signal that enables the corresponding color component based on the color component data of the image and the display order.
[0012] In one implementation of the first aspect, the display brightness of the silicon-based liquid crystal pixel is determined based on the voltage of the silicon-based liquid crystal and the pulse width of the pulse width modulation signal generated by the programmable processing unit.
[0013] In one implementation of the first aspect, the micro-light-emitting diode pixel array includes a micro-light-emitting diode pixel array having a common cathode or a micro-light-emitting diode pixel array having a common anode.
[0014] In one implementation of the first aspect, the capacitor array includes capacitors; The capacitor is connected to the power supply of the pixel driver transistor of the micro-LED pixel and is configured to provide a stable current to the micro-LED pixel when the micro-LED pixel in the micro-LED pixel array with a common cathode is turned on.
[0015] In one implementation of the first aspect, the capacitor includes an on-chip capacitor.
[0016] In one implementation of the first aspect, the on-chip capacitor includes a metal-oxide-metal capacitor or a metal-insulator-metal capacitor.
[0017] In one implementation of the first aspect, the capacitor array includes an external capacitor array; The external capacitor array is connected to the common anode of the micro-LED pixels with a common anode and is configured to provide a stable current to the micro-LED pixels when they are turned on.
[0018] In one implementation of the first aspect, the baseboard controller includes a baseboard on which the external capacitor array is mounted.
[0019] In one implementation of the first aspect, the external capacitor array includes ceramic capacitors.
[0020] In one implementation of the first aspect, the baseboard controller includes a silicon-based liquid crystal panel controller chip, and the external capacitor array is connected to the silicon-based liquid crystal panel controller chip via metal balls, metal films, or metal paste.
[0021] In one implementation of the first aspect, the display brightness of the micro-light-emitting diode pixels in the micro-light-emitting diode pixel array is determined based on the current density of the micro-light-emitting diode pixels and the pulse width of the pulse width modulation signal generated by the programmable processing unit.
[0022] In one implementation of the first aspect, the micro-light-emitting diode pixel is turned on when the voltage between the non-common electrode and the common cathode of the micro-light-emitting diode pixel is greater than the turn-on voltage threshold.
[0023] In one implementation of the first aspect, the micro-light-emitting diode pixel is turned on when the voltage between the common anode and the non-common electrode of the micro-light-emitting diode pixel is greater than the turn-on voltage threshold.
[0024] In one implementation of the first aspect, the micro-light-emitting diode pixel of the common cathode is turned off when the voltage between the non-common electrode and the common cathode of the micro-light-emitting diode pixel is less than the turn-off voltage threshold.
[0025] In one implementation of the first aspect, the micro-light-emitting diode pixel with common anode is turned off when the voltage between the common anode and non-common electrode of the micro-light-emitting diode pixel is less than the turn-off voltage threshold.
[0026] In one implementation of the first aspect, when the micro-light-emitting diode pixel array is a micro-light-emitting diode pixel array with a common cathode, the programmable processing unit adjusts the voltage on the common cathode so that a corresponding peak current is applied to the turned-on micro-light-emitting diode pixel.
[0027] In one implementation of the first aspect, when the micro-light-emitting diode pixel array is a micro-light-emitting diode pixel array with a common anode, the programmable processing unit adjusts the voltage on the common anode so that a corresponding peak current is applied to the turned-on micro-light-emitting diode pixel.
[0028] In one implementation of the first aspect, the micro-LED pixel includes at least one of a quantum rod, a quantum dot, an indium gallium nitride / gallium nitride diode, a combination of a quantum rod and an indium gallium nitride / gallium nitride diode, and a combination of a quantum dot and an indium gallium nitride / gallium nitride diode.
[0029] Secondly, embodiments of this application provide a display device, which includes a baseboard controller as described in the first aspect and various implementations thereof.
[0030] The baseboard controller and display device for controlling LCOS and micro-LED displays provided in the embodiments of this application have the following beneficial effects: The baseboard controller provided in this application includes a display pixel array and a programmable processing unit array. The programmable processing unit array executes an instruction sequence, thereby adjusting the pulse width of the pulse width adjustment signal corresponding to each pixel in the pixel array according to the display data. This enables display driving of LCOS pixels. When driving MicroLED display pixels, a capacitor array can be used to stabilize the driving voltage of the display pixel array, thereby providing a stable driving current to ensure continuous and stable conduction of the MicroLED display pixels. Therefore, the baseboard controller provided in this application can achieve both MicroLED display driving control and LCOS display driving control. Attached Figure Description To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0031] Figure 1 This is a schematic diagram of the structure of a spatial light modulator chip for an LCOS display provided in an embodiment of this application; Figure 2This is a functional block diagram of the LCOS pixel provided in the embodiments of this application; Figure 3 This is a schematic diagram of a baseboard controller provided in an embodiment of this application; Figure 4 This is a schematic diagram of another baseboard controller architecture provided in an embodiment of this application; Figure 5 This is a functional block diagram of a Micro LED monochrome pixel with a common cathode provided in an embodiment of this application; Figure 6 This is a functional block diagram of a Micro LED monochrome pixel with a common anode provided in an embodiment of this application; Figure 7 This is a functional block diagram of a Micro LED multi-color pixel with a common cathode provided in an embodiment of this application; Figure 8 This is a functional block diagram of a Micro LED multi-color pixel with a common anode provided in an embodiment of this application. Detailed Implementation
[0032] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.
[0033] It should be understood that the term "and / or" as used in this application specification and the appended claims refers to any combination of one or more of the associated listed items, as well as all possible combinations, and includes such combinations. Furthermore, in the description of this application specification and the appended claims, the terms "first," "second," "third," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance.
[0034] It should also be understood that references to "one embodiment" or "some embodiments" in this specification mean that one or more embodiments of this application include the specific features, structures, or characteristics described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.
[0035] Liquid Crystal on Silicon (LCOS) display technology is a reflective micro-display technology based on liquid crystal on silicon (LCOS). It integrates liquid crystal and CMOS integrated circuits and is mainly used in optical projection systems, high-definition televisions (HDTV), head-mounted displays (HMD), and automotive displays (such as HUD, dashboards, and center consoles). Its core uses a silicon substrate integrated CMOS driving circuit, combined with aluminum reflective electrodes and off-axis optical design. It achieves optical path separation through polarizing beam splitters, concave reflective mirror architecture, and polarizing films, which can meet the display requirements of high light efficiency and high resolution.
[0036] Please see Figure 1 , Figure 1 A schematic diagram of the spatial light modulator (SLM) chip 10 for an LCOS display is shown. Figure 1 As shown, the spatial light modulator chip 10 for an LCOS display may include an LCOS panel controller chip 20, a substrate 30, input / output pins (I / O pins) 40, wire bonding 50, ITO pads 60, and ITO glass 70. The LCOS panel controller chip 20 internally includes a display pixel array 21, a programmable processing element (PPE) array 22, and bonding pads 23. External system controller chips can transmit commands and display data to the LCOS panel controller chip 20 via the I / O pins 40, wire bonding 50, and bonding pads 23. Since the driving of LCOS pixels depends on the electric field generated by the liquid crystal voltage, the voltage on the ITO glass is typically provided by the LCOS panel controller chip 20.
[0037] Figure 2 A functional block diagram of an LCOS pixel is shown. For example... Figure 2 As shown, an LCOS pixel in an LCOS display may include a glass 201, a top electrode 202, a liquid crystal layer 203, a bottom electrode 204, a bottom electrode voltage driver 205, a pixel switch status bit 206, a pulse width modulation (PWM) module 207, a programmable processing unit (PPE) 208, and an instruction data buffer 209. The output of the LCOS panel controller is typically stored in the pixel switch status bit 206, which is then used to regulate the output of the bottom electrode voltage driver 205, i.e., to control the amount of charge on the bottom electrode 204 to adjust the driving voltage of the liquid crystal material.
[0038] In the traditional LCOS pixel output control method, the output of the bottom electrode voltage driver 205 is adjusted by the pulse width of the PWM signal output by the PWM module 207.
[0039] The output value of PWM module 207 is determined by a combination of pixel values cached in instruction data buffer 209 and counters and / or timing control information in programmable processing unit (PPE) 208. This combination is used to generate the next output signal of PWM module 207 corresponding to the current output.
[0040] In some embodiments, the output of the PWM module 207 is typically a single pulse to reduce the number of switching operations and thus save power.
[0041] With the continuous development of technology, Micro LED displays, due to their realistic colors and rich details, are widely used in augmented reality display devices. However, Micro LEDs are current-driven light-emitting devices, which differ from voltage-driven light-emitting devices such as LCOS.
[0042] Therefore, how to provide a baseboard controller that can drive and control both Micro LED displays and LCOS displays is a technical problem that urgently needs to be solved.
[0043] Based on this, embodiments of this application provide a baseboard controller for controlling LCOS and micro-light-emitting diode displays. The baseboard controller includes a display pixel array and a programmable processing unit array. The programmable processing unit array executes instruction sequences to adjust the pulse width corresponding to the pixels in the pixel array according to the display data, thereby enabling display driving of LCOS pixels. When driving micro-LED display pixels, a capacitor array can be used to stabilize the driving voltage of the display pixel array, thereby providing a stable driving current to ensure continuous and stable conduction of micro-LED display pixels. Therefore, the baseboard controller provided in this application can realize both micro-light-emitting diode (Micro LED) display driving control and LCOS display driving control.
[0044] The display device provided in the embodiments of this application will now be described in detail with reference to the accompanying drawings: Please see Figure 3 , Figure 3This illustration shows a schematic diagram of a baseboard controller according to an embodiment of this application. Specifically, the baseboard controller can be a spatial light modulator chip; more specifically, it can also be a panel controller chip, such as a panel controller chip formed by adding a capacitor array to the architecture of an LCOS panel controller chip. The display device provided in this embodiment can be applied to both LCOS display panel controllers and MicroLED display panel controllers.
[0045] like Figure 3 As shown, the baseboard controller 300 provided in this application embodiment may include a display pixel array 21, a programmable processing unit array (PPE) 202, and a capacitor array 80.
[0046] In practical applications, the capacitor array 80 described above can be connected to the display pixel array 21.
[0047] In this embodiment, the display pixel array 21 can be an LCOS pixel array or a MicroLED pixel array. That is, the display pixel array 21 can be a display pixel array composed of LCOS pixels or a display pixel array composed of MicroLED display pixels.
[0048] In one embodiment of this application, the baseboard controller 300 can retain the original architecture of the original LCOS display panel controller and add a capacitor array 80. The original LCOS display panel controller architecture is used to drive the LCOS display; for Micro LED displays, the capacitor array 80 is used to stabilize the driving voltage of the Micro LED pixels to maintain stable conduction of the Micro LEDs.
[0049] For example, please refer to Figure 4 , Figure 4 A schematic diagram of the architecture of the baseboard controller 300 provided in an embodiment of this application is shown. Figure 4 As shown, the aforementioned baseboard controller 300 may specifically include an LCOS panel controller chip 20, a substrate 30, input / output pins (I / O pins) 40, wire bonding 50, ITO pads 60, ITO glass 70, and a capacitor array 80. The LCOS panel controller chip 20 internally includes a display pixel array 21, a programmable processing element (PPE) array 202, and bonding pads 23.
[0050] The controller chip of the external system can transmit instructions and display data to the LCOS panel controller chip 20 through I / O pin 40, wire bonding 50 and bonding pad 23.
[0051] In specific applications, the programmable processing unit array 22 may include several programmable processing units (PPEs). These programmable processing units can adjust the pulse width of the PWM signal output by the PWM module according to the instructions and display data transmitted by the control chip of the external system, thereby controlling the output of the bottom electrode voltage driver of the display pixel and adjusting the driving voltage of the liquid crystal.
[0052] Since the driving current of the Micro LED pixel originates from the driving voltage, the voltage on the ITO glass is provided by a programmable external power supply, the ITO pads are located on the substrate 30, and the capacitor array 80 ensures that the Micro LED is continuously and stably turned on by stabilizing the ITO voltage.
[0053] For Micro LED pixels, the programmable processing unit can be used to generate corresponding pulse width modulation signals and Micro LED pixel current densities based on display data. The pulse width modulation signals are used to control the on-time of the Micro LED pixels under the controlled current density.
[0054] As can be seen from the above, the display device provided in this application embodiment can drive the LCOS display through the original LCOS display panel controller architecture; for the Micro LED display, the driving voltage of the MicroLED pixels is stabilized by the capacitor array 80 to maintain the stable conduction of the Micro LED and thus drive the Micro LED display.
[0055] In one embodiment of this application, the above-mentioned display device can be applied to a monochrome pixel display or a multi-color pixel display, that is, the display pixel array 21 can be a monochrome pixel array or a multi-color pixel array.
[0056] In one embodiment of this application, the aforementioned monochrome pixel array may be a display pixel array composed of Micro LED monochrome pixels. The Micro LED monochrome pixels may be monochrome pixels with a common cathode or monochrome pixels with a common anode.
[0057] For example, please refer to Figure 5 , Figure 5 A functional block diagram of a Micro LED monochrome pixel with a common cathode is shown. Figure 5 As shown, a Micro LED monochrome pixel may include glass 211, top electrode 212, Micro LED 213, bottom electrode 214, bottom electrode voltage driver 215, Micro LED switch status bit 216, PWM module 217, programmable processing unit (PPE) 218, and instruction and data storage unit 219.
[0058] The Micro LED monochrome pixel in this example is a Micro LED monochrome pixel with a common cathode.
[0059] The output of a Micro LED monochrome pixel is typically controlled by the Micro LED switch status bit 216. In common cathode mode (i.e., the cathodes of the Micro LED monochrome pixels are connected together), the Micro LED switch status bit 216 outputs '1' to indicate on and '0' to indicate off. This Micro LED switch status bit 216 is also used to drive the bottom electrode voltage driver 215. The bottom electrode voltage driver 215 works in conjunction with the capacitor 220 in the capacitor array 80 to maintain a stable current between the bottom electrode 214 and the top electrode 212, thereby regulating the luminous brightness of the Micro LED.
[0060] In practical applications, the capacitor 220 can be connected to the power supply of the pixel driver transistor to provide a stable current to the Micro LED pixel when it is turned on in common cathode mode.
[0061] In controlling the output brightness of a Micro LED monochrome pixel, the pulse width of the PWM signal output by the PWM module 217 is determined by a combination of the pixel value stored in the instruction and data storage unit 219 and the counter and / or timing control information in the programmable processing unit (PPE) 218. This combination result is used to generate the next output signal of the PWM module 217 relative to the current output.
[0062] In some embodiments, the output of the PWM module 217 is typically a single pulse to reduce the number of switching operations and thus save power.
[0063] In specific applications, the capacitor 220 described above can be a metal-oxide-metal capacitor (MOM capacitor) or a metal-insulator-metal capacitor (MIM capacitor).
[0064] MOM capacitors are small, multifunctional devices commonly used in chips, with their metal layers employing an interlaced, multi-finger structure. The plates of a MOM capacitor can include standard metal wiring and optional vias (i.e., plated through-holes on a circuit board), generating the desired capacitance value through the lateral (interlayer) capacitive coupling effect between the plates.
[0065] In some embodiments, to increase capacitance density, multiple metal layers can be connected in parallel using vias to form vertical metal walls or mesh structures.
[0066] In one embodiment of this application, the capacitor 220 may employ a top three metal layers, such as M4-M6 or M3-M5, as the plates of the MOM capacitor. These metal layers have the minimum metal linewidth and spacing, thereby maximizing capacitance density while reserving circuit space for other lower metal layers (such as M1-M3 or M1-M2).
[0067] Metal-insulator-metal (MIM) capacitors are another type of compact capacitor. Similar to parallel-plate capacitors, MIM capacitors consist of metal plates (electrodes) and a dielectric material (insulating layer). MIM capacitors have a high capacitance per unit area.
[0068] To improve capacitance performance, metal-insulator-metal (MIM) capacitors typically employ a three-layer structure: the outermost layer consists of two metal plates manufactured using standard processes (usually located on top), with a special metal layer sandwiched in between. This allows MIM capacitors to achieve higher capacitance density while preserving circuit space for other lower metal layers (such as M1-M4 or M1-M3).
[0069] In practical applications, the Micro LED 213 can be, but is not limited to, quantum rods, quantum dots, indium gallium nitride (InGaN) / gallium nitride (GaN) diodes, combinations of quantum rods and InGaN / gaN diodes, or combinations of quantum dots and InGaN / gaN diodes.
[0070] When displaying an RGB image on a monochrome display (i.e., the display driven by the aforementioned display device is a monochrome display), the pulse width of the PWM signal can be determined using only the luminance component of the image.
[0071] In practical applications, the conversion formula from RGB values to luminance components in an RGB image can be defined as: Y = 0.299 R + 0.587 G + 0.114 B, where Y represents the luminance value, R represents the red component, G represents the green component, and B represents the blue component.
[0072] In this embodiment of the application, the display time of each brightness frame can be set between 1 / 180 second and 1 / 60 second by a programmable processing unit.
[0073] For another example, please refer to Figure 6 , Figure 6 A functional block diagram of a Micro LED monochrome pixel with a common anode is shown. Figure 6As shown, a Micro LED monochrome pixel may include glass 211, top electrode 212, Micro LED 213, bottom electrode 214, bottom electrode voltage driver 215, Micro LED switch status bit 216, PWM module 217, programmable processing unit (PPE) 218, and instruction and data storage unit 219.
[0074] In this example, the Micro LED monochrome pixel is a Micro LED monochrome pixel with a common anode. That is, the anodes of the Micro LED monochrome pixels are connected together.
[0075] Micro LED monochrome pixel output is typically controlled by Micro LED switch status bit 216. In common anode mode, Micro LED switch status bit 216 outputs '1' to indicate off and '0' to indicate on. Micro LED switch status bit 216 is then used by bottom electrode voltage driver 215. Capacitor array 80 may include capacitor 220 and external capacitor array 225. The bottom electrode voltage driver 215 works in conjunction with capacitor 220, external capacitor array 225, and external power supply VPP (ITO glass voltage) to ensure a stable current is maintained between top electrode 212 and bottom electrode 214, thereby controlling the luminous intensity of the Micro LED monochrome pixel.
[0076] In specific applications, the external capacitor array 225 can be connected to the common anode of the common anode Micro LED pixel to provide a stable current to the Micro LED pixel when it is turned on in the common anode mode (when it is in the on state).
[0077] In specific applications, the aforementioned external capacitor array may include ceramic capacitors mounted on a chip substrate, with each ceramic capacitor having a capacitance between 1nF and 1uF.
[0078] In practical applications, the aforementioned external capacitor array can be connected to the LCOS panel control chip via metal balls, transparent metal films, or metal paste.
[0079] In another embodiment of this application, the multi-color pixel array can be a display pixel array composed of Micro LED multi-color pixels. The Micro LED multi-color pixels can be multi-color pixels with a common cathode or multi-color pixels with a common anode.
[0080] For example, please refer to Figure 7 , Figure 7 A functional block diagram of a MicroLED multi-color pixel with a common cathode according to an embodiment of this application is shown. Figure 7As shown, Figure 7 The Micro LEDs 221a, 221b, 221c, and 221d in the design correspond to the three primary colors of RGB, with two of them using the same color. For example, Micro LED 221a and 221b are red pixels, Micro LED 221c is a green pixel, and Micro LED 221d is a blue pixel; or Micro LED 221a and 221b are green pixels, Micro LED 221c is a red pixel, and Micro LED 221d is a blue pixel; or Micro LED 221a and 221b are blue pixels, Micro LED 221c is a green pixel, and Micro LED 221d is a red pixel, etc. The specific selection can be set according to the actual application requirements, and this application does not impose specific restrictions on this.
[0081] like Figure 7 As shown, Micro LED 221a is connected to bottom electrode 214a, Micro LED 221b is connected to bottom electrode 214b, Micro LED 221c is connected to bottom electrode 214c, and Micro LED 221d is connected to bottom electrode 214d. Bottom electrodes 214a, 214b, 214c, and 214d are controlled by bus selection signal 224, which is generated by programmable processing unit PPE 218. The bus selection signal controls the on / off state of switches 222a, 222b, 222c, and 222d. Switch 222a is connected to bottom electrode 214a, switch 222b is connected to bottom electrode 214b, switch 222c is connected to bottom electrode 214c, and switch 222d is connected to bottom electrode 214d. When switch 222a is selected (i.e., the switch is closed), the corresponding Micro LED 221a is turned on. When switch 222a is not selected, the corresponding Micro LED 221a is turned off. Similarly, the on / off state of the Micro LED can be controlled by the bus selection signal.
[0082] In practical applications, different colors of Micro LEDs need to be selected one by one, meaning that only one color of Micro LED is on at any given time.
[0083] The programmable processing unit can determine the pulse width of the corresponding pulse width modulation signal and the bus selection signal that enables the corresponding color component based on the data of each color component of the image and the display order.
[0084] In practical applications, the brightness of a Micro LED can be controlled by the current density flow in the Micro LED and the pulse width corresponding to the PWM signal output based on the display data of the RGB image to be displayed.
[0085] In practical applications, different colored Micro LEDs can achieve peak current at different voltages. That is, the driving voltage corresponding to the peak current of different colored Micro LEDs is different.
[0086] In practical applications, when the Micro LED is turned on, a corresponding driving voltage is applied to make the Micro LED be in a peak current state. The brightness of the Micro LED pixels is adjusted by controlling the turn-on time of the Micro LED (controlled by a PWM signal).
[0087] In one embodiment of this application, the base plate controller 300 can adjust the voltage of the bottom electrode to make the driving voltage of the Micro LED higher than the turn-on voltage threshold, and provide a stable driving current for the Micro LED when the driving voltage of the Micro LED is higher than the first voltage threshold.
[0088] In practical applications, when the voltage between the non-common electrode and the common cathode of a micro-LED pixel is greater than the threshold voltage, the micro-LED pixel at the common cathode is turned on; or when the voltage between the common anode and the non-common electrode of a micro-LED pixel is greater than the threshold voltage, the micro-LED pixel at the common anode is turned on.
[0089] In specific applications, the aforementioned turn-on voltage threshold can be set according to the actual application situation. In one embodiment, the aforementioned turn-on voltage threshold can be within the voltage range of 2V to 3V.
[0090] In one embodiment of this application, the Micro LED is turned off when the forward voltage of the Micro LED is lower than the shutdown voltage threshold.
[0091] In specific applications, the aforementioned shutdown voltage threshold can be set according to the actual application situation. In one embodiment, the aforementioned shutdown voltage threshold can be within the voltage range of 1V to 2V.
[0092] By controlling the voltage on the non-common electrode (bottom electrode), the forward voltage of the Micro LED can be made higher than the turn-on voltage threshold or lower than the turn-off voltage threshold, thereby enabling the Micro LED to be turned on or off.
[0093] In practical applications, when the voltage between the non-common electrode and the common cathode of a micro-LED pixel is less than the shutdown voltage threshold, the micro-LED pixel with the common cathode is turned off; or when the voltage between the common anode and the non-common electrode of a micro-LED pixel is less than the shutdown voltage threshold, the micro-LED pixel with the common anode is turned off.
[0094] In other embodiments, when the Micro LED display pixel array is configured in common cathode mode, the voltage on the common cathode can be adjusted by a programmable processing unit so that the activated Micro LED is subjected to the peak current corresponding to the Micro LED of the corresponding color.
[0095] For example, Figure 8 A functional block diagram of a Micro LED multi-color pixel with a common anode, provided in an embodiment of this application, is shown. Figure 8 As shown, Figure 8 The Micro LEDs 223a, 223b, 223c, and 223d, which share a common anode, correspond to the three primary colors of RGB, with two of them using the same color. For example, Micro LED 223a and 223b are red pixels, Micro LED 223c is a green pixel, and Micro LED 223d is a blue pixel; or Micro LED 223a and 223b are green pixels, Micro LED 223c is a red pixel, and Micro LED 223d is a blue pixel; or Micro LED 223a and 223b are blue pixels, Micro LED 223c is a green pixel, and Micro LED 223d is a red pixel, etc. The specific selection can be set according to the actual application requirements, and this application does not impose specific restrictions on this.
[0096] like Figure 8As shown, Micro LED 223a is connected to bottom electrode 214a, Micro LED 223b is connected to bottom electrode 214b, Micro LED 223c is connected to bottom electrode 214c, and Micro LED 223d is connected to bottom electrode 214d. Bottom electrodes 214a, 214b, 214c, and 214d are controlled by bus selection signal 224, which is generated by programmable processing unit PPE 218. The bus selection signal controls the on / off state of switches 222a, 222b, 222c, and 222d. Switch 222a is connected to bottom electrode 214a, switch 222b is connected to bottom electrode 214b, switch 222c is connected to bottom electrode 214c, and switch 222d is connected to bottom electrode 214d. When switch 222a is selected (i.e., the switch is closed), the corresponding Micro LED 223a is turned on; when switch 222a is not selected, the corresponding Micro LED 223a is turned off. Similarly, the on / off state of the Micro LED can be controlled by the bus selection signal.
[0097] In practical applications, different colors of Micro LEDs need to be selected one by one, meaning that only one color of Micro LED is on at any given time.
[0098] In practical applications, the brightness of a Micro LED can be controlled by the current density flow in the Micro LED and the pulse width (i.e., the on-time) of the PWM signal output based on the display data of the RGB image to be displayed.
[0099] In practical applications, different colored Micro LEDs can achieve peak current at different voltages. That is, the driving voltage corresponding to the peak current of different colored Micro LEDs is different.
[0100] In practical applications, when the Micro LED is turned on, a corresponding driving voltage is applied to make the Micro LED be in a peak current state. The brightness of the Micro LED pixels is adjusted by controlling the turn-on time of the Micro LED (controlled by a PWM signal).
[0101] In one embodiment of this application, the base plate controller 300 can adjust the voltage of the bottom electrode to make the driving voltage of the Micro LED higher than the turn-on voltage threshold, and provide a stable driving current for the Micro LED when the driving voltage of the Micro LED is higher than the first voltage threshold.
[0102] In specific applications, the aforementioned turn-on voltage threshold can be set according to the actual application situation. In one embodiment, the aforementioned turn-on voltage threshold can be within the voltage range of 2V to 3V.
[0103] In one embodiment of this application, the Micro LED is turned off when the forward voltage of the Micro LED is lower than the shutdown voltage threshold.
[0104] In specific applications, the aforementioned shutdown voltage threshold can be set according to the actual application situation. In one embodiment, the aforementioned shutdown voltage threshold can be within the voltage range of 1V to 2V.
[0105] By controlling the voltage on the non-common electrode (bottom electrode), the forward voltage of the Micro LED can be made higher than the turn-on voltage threshold or lower than the turn-off voltage threshold, thereby enabling the Micro LED to be turned on or off.
[0106] In other embodiments, when the Micro LED display pixel array is configured in common anode mode (i.e., operating mode with a common anode), the voltage on the common anode can be adjusted by a programmable processing unit so that the activated Micro LED is subjected to the peak current corresponding to the Micro LED of the corresponding color.
[0107] It should be noted that when the display pixel array is a multi-primary color display pixel array, each time a primary color corresponding to a primary color is displayed, the order of the displayed primary color frames can be programmed as RGBRGB, RGBRGBRGB, GRGBGR, GRGBGRGRGBGR or other combinations, and the display time of each primary color frame can be programmed to be between 1 / 720 second and 1 / 360 second.
[0108] As can be seen from the above, the baseboard controller provided in this application embodiment can drive LCOS displays, Micro LED displays, Micro LED displays with a common cathode, Micro LED displays with a common anode, monochrome displays, and multi-color displays, and has a wide range of applications.
[0109] This application also provides a display device, which includes a baseboard controller as provided in any of the above embodiments.
[0110] In specific applications, the aforementioned display device may be a display device including a Micro LED display panel or an LCOS display panel.
[0111] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the terminal device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.
[0112] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, refer to the relevant descriptions of other embodiments.
[0113] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.
[0114] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.
Claims
1. A baseboard controller for controlling LCOS (Liquid Crystal on Silicon) and micro-light-emitting diode displays, characterized in that, include: Display pixel array; Programmable processing unit array; The programmable processing unit array adjusts the control pulse width corresponding to the display pixels in the display pixel array by executing a sequence of instructions to adjust the display brightness of the pixels; The instruction sequence is generated by the programmable processing unit based on the display data; A capacitor array is connected to the display pixel array to stabilize the driving voltage of the display pixel array.
2. The base plate controller according to claim 1, characterized in that, The display pixel array is a multi-color display pixel array or a monochrome display pixel array.
3. The base plate controller according to claim 1 or 2, characterized in that, The display pixel array is a silicon-based liquid crystal pixel array, and the programmable processing unit is configured to generate a corresponding pulse width modulation signal according to the display data, and to drive the silicon-based liquid crystal pixels with voltage through the pulse width modulation signal.
4. The base plate controller according to claim 1 or 2, characterized in that, The display pixel array is a micro-light-emitting diode pixel array. The programmable processing unit is configured to generate a corresponding pulse width modulation signal and adjust the current density of the micro-light-emitting diode pixels according to the display data. The pulse width modulation signal is used to control the on-time of the micro-light-emitting diode pixels under the controlled current density.
5. The base plate controller according to claim 2, characterized in that, The display pixel array is a monochrome display array, the display data is converted into luminance component data of the image, and the programmable processing unit is configured to determine the pulse width of the pulse width modulation signal based on the luminance component data of the image.
6. The base plate controller according to claim 2, characterized in that, The display pixel array is a multi-primary-color display array, the display data includes the data of each color component of the image and the display order, and the programmable processing unit is configured to determine the pulse width of the corresponding pulse width modulation signal and the bus selection signal that enables the corresponding color component according to the data of each color component of the image and the display order.
7. The base plate controller according to claim 3, characterized in that, The display brightness of the silicon-based liquid crystal pixel is determined based on the voltage of the silicon-based liquid crystal and the pulse width of the pulse width modulation signal generated by the programmable processing unit.
8. The base plate controller according to claim 4, characterized in that, The micro-light-emitting diode pixel array includes a micro-light-emitting diode pixel array with a common cathode or a micro-light-emitting diode pixel array with a common anode.
9. The base plate controller according to claim 8, characterized in that, The capacitor array includes capacitors; The capacitor is connected to the power supply of the pixel driver transistor of the micro-LED pixel and is configured to provide a stable current to the micro-LED pixel when the micro-LED pixel in the micro-LED pixel array with a common cathode is turned on.
10. The base plate controller according to claim 9, characterized in that, The capacitor includes an on-chip capacitor.
11. The base plate controller according to claim 10, characterized in that, The on-chip capacitor includes a metal-oxide-metal capacitor or a metal-insulator-metal capacitor.
12. The base plate controller according to claim 8, characterized in that, The capacitor array includes an external capacitor array; The external capacitor array is connected to the common anode of the micro-LED pixels with a common anode and is configured to provide a stable current to the micro-LED pixels when they are turned on.
13. The base plate controller according to claim 12, characterized in that, The baseboard controller includes a baseboard, and the external capacitor array is mounted on the baseboard.
14. The base plate controller according to claim 12, characterized in that, The external capacitor array includes ceramic capacitors.
15. The base plate controller according to claim 13, characterized in that, The baseboard controller includes a silicon-based liquid crystal panel controller chip, and the external capacitor array is connected to the silicon-based liquid crystal panel controller chip through metal balls, metal films, or metal paste.
16. The base plate controller according to claim 8, characterized in that, The display brightness of the micro-light-emitting diode pixels in the micro-light-emitting diode pixel array is determined according to the conduction current density of the micro-light-emitting diode pixels generated by the programmable processing unit and the pulse width of the pulse width modulation signal.
17. The base plate controller according to claim 8, characterized in that, When the voltage between the non-common electrode and the common cathode of the micro-LED pixel is greater than the turn-on voltage threshold, the micro-LED pixel of the common cathode is turned on; or when the voltage between the common anode and the non-common electrode of the micro-LED pixel is greater than the turn-on voltage threshold, the micro-LED pixel of the common anode is turned on.
18. The base plate controller according to claim 8, characterized in that, When the voltage between the non-common electrode and the common cathode of the micro-LED pixel is less than the shutdown voltage threshold, the micro-LED pixel of the common cathode is turned off; or when the voltage between the common anode and the non-common electrode of the micro-LED pixel is less than the shutdown voltage threshold, the micro-LED pixel of the common anode is turned off.
19. The base plate controller according to claim 8, characterized in that, When the micro-light-emitting diode pixel array is a micro-light-emitting diode pixel array with a common cathode, the programmable processing unit adjusts the voltage on the common cathode so that a corresponding peak current is applied to the micro-light-emitting diode pixel that is turned on.
20. The base plate controller according to claim 8, characterized in that, When the micro-light-emitting diode pixel array is a micro-light-emitting diode pixel array with a common anode, the programmable processing unit is configured to adjust the voltage on the common anode so that a corresponding peak current is applied to the turned-on micro-light-emitting diode pixel.
21. The base plate controller according to claim 4 or any one of claims 8 to 20, characterized in that, The micro-LED pixel includes at least one of the following: quantum rod, quantum dot, indium gallium nitride / gallium nitride diode, combination of quantum rod and indium gallium nitride / gallium nitride diode, and combination of quantum dot and indium gallium nitride / gallium nitride diode.
22. A display device, characterized in that, The display device includes a base plate controller as described in any one of claims 1 to 21.