CN116805842A - Power supply circuit and power supply method applied to OLED display driving chip - Google Patents
Power supply circuit and power supply method applied to OLED display driving chip Download PDFInfo
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Abstract
The invention discloses a power supply circuit applied to an OLED display driving chip, which is characterized in that more than one auxiliary power supply is arranged in the OLED display driving chip on the basis of a traditional DC-DC switching power supply circuit and is connected to a power line near a storage and digital logic circuit unit. The invention also discloses a power supply method based on the power supply circuit. According to the invention, the auxiliary power supply which has certain power supply capacity and can detect the voltage drop of the power supply path nearby is arranged near the storage circuit and the digital logic circuit in the OLED display driving chip, and when the voltage drop is increased to the preset threshold value, the auxiliary power supply is provided nearby, so that the actual working voltages of the storage circuit and the digital logic circuit are not lower than the threshold voltage under the condition of ultrahigh load, and therefore, the reliability and the compatibility of the chip are enhanced and the cost is reduced under the conditions of not increasing the port and the power consumption of the chip and not reducing the power supply efficiency.
Description
Technical Field
The present invention relates to the field of electronic circuits and semiconductors, and more particularly to the field of Organic Light Emitting Diodes (OLEDs), and more particularly to power supply for OLED display driver chips.
Background
Organic Light Emitting Diode (OLED) display devices are favored by consumers because of their advantages of active light emission, good flexibility, high brightness, high efficiency, and the like. Because of the need to drive the screen pixels, according to the screen resolution, the OLED display driving chip often needs thousands of row driving units and column driving units; and in order to compensate for process variations and aging levels of individual pixels, a large number of memory cells are often required inside the chip to store compensation data. The above factors result in the OLED display driving chip being generally large in size, and the single side length may be tens of millimeters or even tens of millimeters.
The Memory circuit (Memory) and the digital Logic circuit (Logic) in the OLED display driving chip have larger working currents. In order to improve efficiency and reduce power consumption, under normal operation, a DC-DC switching power supply often generates a supply voltage. The DC-DC switching power supply has the advantages of high efficiency, and the disadvantage that the voltage can be used only through off-chip inductance and capacitance filtering, so that a port is occupied to input the power supply voltage into the chip from outside the chip.
As shown in fig. 1, a Memory and digital logic circuit (Memory&Logic) cell DC-DC switching power supply circuit has a large amount of parasitic resistance, including external PCB sub-wiring parasitic resistance R pcb Parasitic resistor R of package routing bond Parasitic resistance Rc of wiring inside chip hip (in FIG. 1, the lateral short side is assumed to be short, so that the lateral parasitic resistance is negligible, only the longitudinal parasitic resistance is considered; in addition, in FIG. 1, the sum of the parasitic resistances on the longitudinal power supply wires of the 1 st and nth modules furthest from the port is assumed to be R chip ). Because the width and thickness of the wiring metal inside the chip are limited, R is caused chip Is the largest of these parasitic resistances and the hazard is the largest.
Still for convenience of explanation, assume that only the 1 st block in the memory and digital logic circuit unit operates and the consumption current is I core1 Current I consumed by the whole memory and digital logic circuit unit core =I core1 . The current flowing through the parasitic resistor will generate a voltage Drop IR Drop, the actual operating voltage V of the 1 st module core1 Can be represented by the following formula:
wherein VDD is ext The power supply voltage which is generated by filtering the DC-DC switching power supply through the off-chip inductor L and the capacitor C and is used for supplying power to the whole storage and digital logic circuit unit. As can be seen from the above formula, I core1 The larger V core1 The smaller; r is R pcb 、R bond R is as follows chip The larger V core1 The smaller. When the 1 st module is in the high-frequency and high-load operation mode, I core1 Increase, or the chip PAD is longer from the 1 st module wiring, resulting in R chip Larger, these factors all lead to V core1 Is a drop in (c). Once V is core1 Falling below the threshold voltage V at which the 1 st module in the memory and digital logic circuit unit can operate normally th-core Time (i.e. V core1 ＜V th-core Threshold voltage V th-core Mainly determined by the chip use process and the frequency of operation required, the Vt of each module h-core And may be considered identical), possibly causing chip failure. In order to enhance the reliability of the chip, it is necessary to reduce the voltage Drop IR Drop as much as possible, i.e. reduce R chip 、R bond 、R pcb These parasitic resistances.
To solve the above problem, it is common practice to add power supply ports, as shown in fig. 2, which are placed at intervals. This approach reduces R to some extent chip (Port near the working Module of the memory and digital logic Unit) and R bond (multiple ports in parallel will reduce R) bond ) But is not effective in reducing R pcb . The disadvantages of this method are: 1) The chip port is occupied too much, the compatibility and flexibility of the chip are reduced, and meanwhile, the packaging cost is increased due to the added bonding line; 2) The method does not provide a detection mechanism for IR Drop to ensure V core Not lower than the threshold voltage V of the normal operation of the operation module th-core Therefore, reliability is not strong enough.
In addition to DC-DC switching power supplies, low dropout linear regulators (LDOs) are also currently used. The voltage can be generated in the chip, so that the LDO power supply has the advantages of not occupying too many chip ports, being simple in circuit design and small in ripple wave; but has the disadvantage of being inefficient.
Disclosure of Invention
One of the technical problems to be solved by the invention is to provide a power supply circuit applied to an OLED display driving chip, which has high compatibility, low power consumption and cost and strong reliability.
In order to solve the technical problems, the power supply circuit applied to the OLED display driving chip comprises a DC-DC switching power supply, an off-chip filter circuit unit, a power supply port and more than one auxiliary power supply. The off-chip filter circuit unit comprises an inductor and a capacitor, wherein one end of the inductor is connected with the DC-DC switching power supply, and the other end of the inductor is connected with the Pin of the power supply port; one end of the capacitor is grounded, and the other end of the capacitor is connected to a power line between the inductor and the Pin. Pin Pin connects PAD that the power supply port is located in the chip. And the PAD is led out of a power line and is respectively connected with each module in the internal storage and digital logic circuit unit of the chip. The auxiliary power supply is arranged near the storage and digital logic circuit unit inside the chip and is connected to the power line of the storage and digital logic circuit unit.
The number of auxiliary power supplies may be determined based on the current provided by the auxiliary power supply as needed and the parasitic resistance of the auxiliary power supply path of the auxiliary power supply to the storage and digital logic circuit unit. The more auxiliary power supplies, the shorter the auxiliary power supply path, the less parasitic resistance the auxiliary power supply path provides (because the maximum total current is fixed, the more auxiliary power supplies, the less current is averaged to each auxiliary power supply), and the less voltage drop is caused.
The auxiliary power supply preferably comprises a voltage drop detection unit and a power supply unit. The voltage drop detection unit preferably comprises a voltage comparator. The inverting input end of the voltage comparator is connected with the power line of the storage and digital logic circuit unit, and the voltage input by the inverting input end is the actual working voltage of the corresponding module in the storage and digital logic circuit unit. The voltage input by the non-inverting input end of the voltage comparator is the difference value between the power supply voltage generated by the DC-DC switching power supply after being filtered by the off-chip filter circuit unit and the voltage drop threshold value set by the voltage drop detection unit (the digital binary code of the difference value can be stored in a register, and the digital binary code can be converted into an analog voltage value through a digital-to-analog converter). The output end of the voltage comparator is connected with the power supply unit. The power supply unit preferably employs a low dropout linear regulator. The power tube in the low dropout linear voltage regulator can use a PMOS power tube or an NMOS power tube. And the voltage output end of the power supply unit is connected with the power line of the storage and digital logic circuit unit.
The second technical problem to be solved by the invention is to provide a power supply method based on the power supply circuit. The power supply method applied to the OLED display driving chip comprises the following steps:
the DC-DC switching power supply supplies power, and generates power supply voltage through off-chip inductance and capacitance filtering;
the current flows through the power line to generate voltage drop;
the auxiliary power supply in the chip detects the actual working voltage of the storage and digital logic circuit unit in real time, and if the actual working voltage is greater than or equal to the difference value between the power supply voltage and the voltage drop threshold value preset by the auxiliary power supply, the auxiliary power supply does not supply power; and if the actual working voltage is smaller than the difference value between the power supply voltage and the voltage drop threshold value, the auxiliary power supply and the DC-DC switching power supply together supply power to the storage and digital logic circuit unit.
The voltage drop threshold may be preset by the voltage drop detection unit. The voltage drop detection unit detects the actual working voltage of the storage and digital logic circuit unit in real time, and when the actual working voltage is greater than or equal to the difference value between the power supply voltage and the voltage drop threshold value, the voltage drop detection unit controls the power supply unit to be turned off; and when the actual working voltage is smaller than the difference value between the power supply voltage and the voltage drop threshold value, the voltage drop detection unit controls the power supply unit to be started to supplement power for the storage and digital logic circuit unit.
According to the invention, on the basis of power supply of the DC-DC switching power supply, an internal auxiliary power supply which has certain power supply capacity and can detect the voltage drop of the power supply path nearby is placed at intervals near the digital logic circuit unit and is stored in the OLED display driving chip, when the voltage drop is increased to a preset threshold value, the internal auxiliary power supply is started, and the power supply is supplemented nearby, so that the actual working voltage of the working module is ensured not to be lower than the normal working threshold voltage of the module, and therefore, the voltage drop on the power supply path is reduced under the condition that the chip port is not increased, the reliability and compatibility of the OLED display driving chip are enhanced, and meanwhile, the cost is reduced. In addition, the internal auxiliary power supply only starts the power supply protection chip when the voltage drop is increased to a preset threshold value, so that the voltage drop on the power supply path is prevented from further increasing, and the internal auxiliary power supply is not started in normal operation and is still powered by the external DC-DC switching power supply, so that the power consumption is not increased and the power supply efficiency is reduced.
Drawings
FIG. 1 is a schematic diagram of a conventional DC-DC switching power supply circuit applied to an OLED display driver chip;
FIG. 2 is a schematic diagram of a conventional DC-DC switching power supply circuit configuration with parasitic resistance reduction by adding a supply port;
FIG. 3 is a schematic diagram of a power supply circuit applied to an OLED display driving chip according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of the connection of the auxiliary power supply of FIG. 3;
FIG. 5 is a schematic diagram of a voltage drop detection unit in the auxiliary power supply of FIG. 3;
fig. 6 is a schematic diagram of a structure of a power supply unit in the auxiliary power supply of fig. 3;
fig. 7 is a schematic diagram of the workflow of the power supply circuit according to the embodiment of the invention.
Detailed Description
For a more specific understanding of the technical content, features and effects of the present invention, the technical solution of the present invention will now be described in detail with reference to the accompanying drawings and specific examples.
The power supply circuit applied to the OLED display driving chip in this embodiment has a structure as shown in fig. 3, and mainly includes a DC-DC switching power supply, a filter circuit unit, a power supply port and an auxiliary power supply. The DC-DC switching power supply and the filter circuit unit are arranged outside the chip; the filter circuit unit mainly comprises an inductor L and a capacitor C; the power supply port mainly comprises a wire bonding Pin outside the chip and a PAD inside the chip; one end of the inductor L is connected with the output end of the DC-DC switching power supply, and the other end of the inductor L is connected with a wire bonding Pin of a chip power supply port; one end of the capacitor C is grounded, and the other end of the capacitor C is connected to a power line between the inductor L and the Pin of the wire bonding Pin; the wire bonding Pin is connected with the PAD in the chip; and a power line led out of the chip PAD is respectively connected with each module in the internal storage and digital logic circuit unit of the chip. Auxiliary power supply PWR aux There are n, respectively, disposed near each module of the memory and digital logic circuit unit inside the chip (for convenience of explanation, one module is correspondingly provided with one auxiliary power supply, and the voltages of each auxiliary power supply are equal), and are coupled to the power lines of the memory and digital logic circuit units (see fig. 3, 4).
Each auxiliary power supply PWR aux The power supply device comprises a voltage Drop (IR Drop) detection unit and a power supply unit.
In the present embodiment, the auxiliary power supply PWR aux The voltage drop detection unit is realized by a voltage comparator, the structure of which is shown in figure 5, the inverting ("-") input end of the voltage comparator is connected with the power line near the storage and digital logic circuit unit, and the actual working voltage V of the corresponding module is input core The method comprises the steps of carrying out a first treatment on the surface of the The input voltage value of the in-phase ("+") input terminal is VDD ext -V th-IR Wherein VDD is the voltage of ex t is the voltage generated by the DC-DC switching power supply after being filtered by the filter circuit unit, V th-IR Voltage drop threshold value (voltage drop threshold value of each auxiliary power supply is set to the same value in the present embodiment) set for the voltage drop detection unit, voltage value VDD ext -V th-IR Generated by a digital binary code pre-stored in a register via a digital-to-analog converter (DAC), the stored value of the register is adjusted to adjust VDD ext -Vt h-IR The magnitude of the voltage value; the output end of the voltage comparator is connected with an auxiliary power supply PWR aux The output end of the voltage comparator outputs a PWR_ON signal to control the ON and off of the power supply unit. The operating logic of the voltage comparator is shown in table 1.
Table 1 operating logic of voltage comparator
When the voltage comparator outputs pwr_on=1, the auxiliary power supply PWR is turned ON aux The auxiliary power supply is carried out by the power supply unit; when the voltage comparator outputs pwr_on=0, the auxiliary power supply PWR is turned off aux Is provided.
In the present embodiment, the auxiliary power supply PWR aux The power supply unit in the system is realized by adopting a classical LDO (low dropout linear regulator), the circuit structure is shown in figure 6, wherein V H For high voltage power supply (which can be battery powered or can be powered in other ways), R div1 And R is div2 Is a voltage dividing resistor, VDD int For the output voltage of the power supply unit, VFB is VDD int Through a voltage dividing resistor R div1 The voltage after voltage division, VREF is the reference voltage, VG is the output voltage of an operational amplifier (called 'operational amplifier' for short), and a PMOS tube is adopted as a power tube. VFB is input to the non-inverting ("+") input of the operational amplifier. VREF is input to the inverting ("-") input of the operational amplifier. The voltage output end of the power supply unit is connected with a power line near the storage and digital logic circuit unit.
LDO can supply high-voltage power V H Conversion to auxiliary supply voltage VDD int . The working principle is as follows: when VDD int ＞VREF×(R div2 +R div1 )/R div2 When VFB > VREF, the voltage value of the operational amplifier output voltage VG rises, thereby controlling the output current of the PMOS power tube to be reduced and VDD int The voltage value of (2) decreases under discharge of the load current; when VDD int ＜VREF×(R div2 +R div1 )/R div2 When VFB < VREF, the operational amplifierThe voltage value of the output voltage VG is reduced, thereby controlling the output current of the PMOS power tube to be increased and VDD in the voltage value of t is increased under the charging of the power tube; eventually, VDD int Through the action of the feedback mechanism, the system can be stabilized at the VDD int =VREF×(R div2 +R div1 )/R div2 . From this equation, it can be seen that VREF and R can be adjusted div1 And R is div2 Is to adjust the ratio of VDD int Voltage value.
Auxiliary power supply PWR aux There are various implementation methods of the LDO of the power supply unit in the above, and in other embodiments, the power tube may be implemented using NMOS.
The following pair of auxiliary power supply PWR aux The working principle of (a) is described.
With the 1 st auxiliary power supply PWR aux1 As an example. No. 1 auxiliary power supply PWR aux1 The voltage drop detection unit in the memory and digital logic circuit unit can detect the voltage value V on the 1 st module power line core1 (i.e., the actual operating voltage of the 1 st module). The voltage drop threshold set by the voltage drop detection unit is V th-IR . For ease of illustration, it is assumed that the memory and digital logic circuit unit only operates with the 1 st block and consumes current I core1 . When the 1 st module is in high load operation, the current I is consumed core1 When the voltage is larger, the generated voltage drop is larger, if the actual working voltage V of the 1 st module core1 Down to VDD ext -V th-IR ＞V core1 ≥V th-core The 1 st auxiliary power supply PWR aux1 The voltage drop detection unit in (1) outputs a control signal to turn on the PWR aux1 The power supply unit in (2) supplements power supply for the 1 st module. Voltage VDD output by power supply unit int Meet VDD ext -V th-IR ＞VDD int ≥V th-core V at this time core1 =VDD int -R aux1 I aux1 (formula I) wherein R aux1 Is the 1 st auxiliary power supply PWR aux1 Parasitic resistance on the 1 st module path, I aux1 Is the 1 st auxiliary power supply PWR aux1 Is the current supplied by the 1 st module. Due to the supply ofThe electric unit is designed to be close to the 1 st module if the parasitic resistance R of the power supply path is ignored aux1 Then V can be derived from formula I core1 =VDD int So long as VDD is reasonably set int ≥V th-core It is ensured that the 1 st module in the memory and digital logic circuit unit can normally operate in a high load state.
When the 1 st module in the memory and digital logic circuit unit works in low load or normal operation, the data is stored in the memory and digital logic circuit unit due to I core1 Smaller, less voltage drop is generated, thus V core1 ≥VDD ext -Vt h-IR ≥V th-core ，PWR aux1 The voltage drop detection unit in (1) controls the power supply unit to be turned off, and the 1 st module is only powered by an external DC-DC switching power supply. Due to the 1 st auxiliary power supply PWR inside the chip at this time aux1 The power supply unit of the power supply system is not started, so that the power consumption of a chip is not increased, and the power supply efficiency is not reduced; and due to V at this time core1 ≥V th-core The 1 st module in the memory and digital logic circuit unit can still ensure normal operation.
The operation flow of the power supply circuit of this embodiment is shown in fig. 7. Still taking the 1 st module in the storage and digital logic circuit unit as an example, it is assumed that only the 1 st module in the storage and digital logic circuit unit operates. The external DC-DC switching power supply supplies power, and generates a power supply voltage VDD after filtering by an off-chip inductor L and a capacitor C ext The 1 st module consumes current I core1 Current flows through parasitic resistor R of external PCB board wiring pcb Parasitic resistor R of package routing bond Parasitic resistor R of chip internal wiring chip Generating a voltage Drop (IR Drop), the actual operating voltage V of the 1 st module core1 = VDD ext -(R pcb +R bond +R chip )I core1 . 1 st auxiliary power supply PWR inside chip aux1 The voltage drop detection unit in (1) detects the actual operating voltage V of the 1 st module core1 If V core1 ≥VDD ext -V th-IR Description I core1 And smaller, the 1 st module is in a low load or normal working mode, the voltage drop detection unit controls the power supply unit to be closed,continuously and independently supplying power to the 1 st module by an external DC-DC switching power supply; if V core1 ＜VDD ext -V th-IR Description I core1 The 1 st module is increased to enter the high-load operation mode, and the voltage drop detection unit controls the 1 st auxiliary power supply PWR aux1 The power supply unit in the (2) is started, and the power supply unit enters an auxiliary power supply state and supplies power to the 1 st module together with an external DC-DC switching power supply. No. 1 auxiliary power supply PWR aux1 The voltage drop detection unit in the circuit continuously detects the actual working voltage V of the 1 st module core1 If V core1 ＜VDD ext -V th-IR The voltage drop detection unit controls the power supply unit to be in an on state continuously so as to keep the hybrid power supply mode; if V is detected core1 ≥VDD ext -V th-IR And if the voltage drop detection unit controls the power supply unit to be turned off, and the external DC-DC switching power supply is used for independently supplying power to the 1 st module.
The foregoing embodiments are merely examples of possible or preferred embodiments of the present invention, which are not intended to limit the scope of the present invention, and therefore, all equivalent changes and modifications that are consistent with the scope of the present invention shall fall within the scope of the present invention.
Claims (10)
1. The power supply circuit applied to the OLED display driving chip comprises a DC-DC switching power supply, an off-chip filter circuit unit and a power supply port, wherein the off-chip filter circuit unit comprises an inductor and a capacitor, one end of the inductor is connected with the DC-DC switching power supply, the other end of the inductor is connected with a Pin of the power supply port, one end of the capacitor is grounded, the other end of the capacitor is connected with a power line between the inductor and the Pin, the Pin is connected with a PAD of which the power supply port is positioned in the chip, and the power line led out by the PAD is respectively connected with each module in the internal storage and digital logic circuit unit of the chip; the power supply circuit is characterized by further comprising more than one auxiliary power supply, wherein the auxiliary power supply is arranged inside the chip and is connected to the power line of the storage and digital logic circuit unit.
2. The power supply circuit according to claim 1, wherein the auxiliary power supply includes a voltage drop detection unit and a power supply unit.
3. The power supply circuit according to claim 2, wherein the voltage drop detection unit comprises a voltage comparator, an inverting input terminal of the voltage comparator is connected with a power line of the storage and digital logic circuit unit, and an input voltage is an actual operating voltage of a corresponding module in the storage and digital logic circuit unit; the voltage input by the non-inverting input end of the voltage comparator is the difference value between the power supply voltage generated by the DC-DC switching power supply after being filtered by the off-chip filter circuit unit and the voltage drop threshold value set by the voltage drop detection unit; the output end of the voltage comparator is connected with the power supply unit.
4. The power supply circuit of claim 2, wherein the power supply unit comprises a low dropout linear regulator, and wherein a voltage output terminal of the power supply unit is connected to a power line of the storage and digital logic circuit unit.
5. The power supply circuit of claim 4, wherein the power tube in the low dropout linear regulator is a PMOS tube or an NMOS tube.
6. The power supply method applied to the OLED display driving chip is characterized by comprising the following steps of:
the DC-DC switching power supply supplies power, and generates power supply voltage through off-chip inductance and capacitance filtering;
the current flows through the power line to generate voltage drop;
the auxiliary power supply in the chip detects the actual working voltage of the storage and digital logic circuit unit in real time, and if the actual working voltage is greater than or equal to the difference value between the power supply voltage and the voltage drop threshold value preset by the auxiliary power supply, the auxiliary power supply does not supply power; and if the actual working voltage is smaller than the difference value between the power supply voltage and the voltage drop threshold value, the auxiliary power supply and the DC-DC switching power supply together supply power to the storage and digital logic circuit unit.
7. The power supply method according to claim 6, wherein the auxiliary power supply includes a voltage drop detection unit and a power supply unit, the voltage drop threshold value being preset by the voltage drop detection unit; the voltage drop detection unit detects the actual working voltage of the storage and digital logic circuit unit in real time, and when the actual working voltage is greater than or equal to the difference value between the power supply voltage and the voltage drop threshold value, the voltage drop detection unit controls the power supply unit to be turned off; and when the actual working voltage is smaller than the difference value between the power supply voltage and the voltage drop threshold value, the voltage drop detection unit controls the power supply unit to be started to supplement power for the storage and digital logic circuit unit.
8. The power supply method according to claim 7, wherein the voltage drop detection unit is a voltage comparator, an inverting input terminal of the voltage comparator inputs an actual operating voltage of the storage and digital logic circuit unit, and a non-inverting input terminal inputs a difference value between the power supply voltage and a voltage drop threshold preset by the voltage drop detection unit; and the output end of the voltage comparator outputs a signal for controlling the switch of the power supply unit.
9. The power supply method according to claim 8, wherein the power supply unit is turned on when the output terminal of the voltage comparator outputs 1; when the output end of the voltage comparator is 0, the power supply unit is turned off.
10. The power supply method according to claim 7, wherein the power supply unit is a low dropout linear regulator.
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