TWI760184B - OLED display with pixel protection function and information processing device using the same - Google Patents

Abstract

An OLED display with pixel protection function, comprising: an OLED pixel array module, including a plurality of sub-pixel units in an array and a low voltage detection unit, wherein the low voltage detection unit is used for the When a source driving voltage of a sub-pixel unit in the plurality of sub-pixel units is lower than a threshold voltage, an output signal exhibits an inactive state; and a control circuit is used for driving the OLED pixel array module and its It includes a power module and a power enable unit, wherein the power module is used to provide a set of power supply voltages to each of the sub-pixel units when an enable signal is in an active state, and when the enable signal is displayed Turn off the set of power supply voltages in the inactive state; and the power enabling unit is used for enabling the enabling signal to present any level when the level of a pulse modulation signal is logic 0 and the output signal presents the inactive state Inactive state.

Description

OLED display with pixel protection function and information processing device using the same

The present invention relates to an OLED (organic light emitting diode; organic light emitting diode) display, in particular to an OLED display with pixel protection function.

Generally, the current driving circuit of the sub-pixel unit of an OLED display adopts PMOS (P-type gold-oxygen-semi) transistors. Therefore, the data voltage input terminal (or source driving voltage input terminal) of the sub-pixel unit generates If the signal connection is abnormal, for example, the signal line has poor conduction or breakage, and does not reach the normal potential, the sub-pixel unit is very likely to generate a large current and an ultra-bright white picture, causing it to be burned.

To solve the above problems, a novel OLED display structure is urgently needed in the art.

One objective of the present invention is to provide an OLED display with pixel protection function, which can prevent the OLED panel from being burned by turning off the power supply when an abnormal condition occurs in the data voltage signal transmission between the display control circuit and the OLED panel.

Another object of the present invention is to provide an information processing device, which has the aforementioned OLED display and can turn off the power supply when an abnormal condition occurs in the data voltage signal transmission between the display control circuit and the OLED panel to prevent the OLED panel from being burned.

In order to achieve the aforementioned purpose, an OLED display with pixel protection function is proposed, which has:

An OLED pixel array module, which includes a plurality of sub-pixel units in an array and a low-voltage detection unit, wherein the low-voltage detection unit is used for a sub-pixel in the plurality of sub-pixel units When a source drive voltage of a cell is lower than a threshold voltage, an output signal is rendered inactive; and

A control circuit is used for driving the OLED pixel array module and includes a power module, a light-emitting driving unit and a power enabling unit, wherein the power module is used for showing an active state when an enabling signal is used provide a set of power supply voltages to each of the sub-pixel units, and turn off the set of power supply voltages when the enable signal is in an inactive state; the light-emitting driving unit is used for generating a pulse modulation signal to the power source an enabling unit and each of the sub-pixel units; and the power enabling unit is used to make the enabling signal present all conditions when the level of the pulse modulation signal is logic 0 and the output signal presents the inactive state Inactive state.

In one embodiment, the low voltage detection unit is a logic and gate.

In one embodiment, the power enable unit is a logic OR gate.

In one embodiment, the sub-pixel unit includes a first PMOS transistor, a second PMOS transistor, a third PMOS transistor, and an OLED element in a stacked configuration, wherein the stacked group The state system is coupled between the set of supply voltages; the gates of the first PMOS transistor and the third PMOS transistor are coupled to the pulse modulation signal, and the gate of the second PMOS transistor is coupled to one of the source driving voltage and provide the voltage of the gate to the low voltage detection unit.

In one embodiment, the sub-pixel unit includes a first PMOS transistor, a second PMOS transistor, a third PMOS transistor, and an OLED element in a stacked configuration, and a comparator, wherein , the stacking configuration is coupled between the set of supply voltages; the gates of the first PMOS transistor and the third PMOS transistor are coupled to the pulse modulation signal, the second PMOS transistor is The gate is coupled to a source driving voltage; the positive input terminal of the comparator is coupled to the gate of the second PMOS transistor, the negative input terminal is coupled to a threshold voltage, and the output terminal provides a low voltage indication signal to the The low-voltage detection unit, wherein when the voltage of the positive input terminal is lower than the threshold voltage, the low-voltage indication signal presents a state of logic 0.

In order to achieve the aforementioned object, the present invention further provides an information processing device, which has a central processing unit and an OLED display, wherein the central processing unit is used for communicating with the OLED display, and the OLED display has:

An OLED pixel array module, which includes a plurality of sub-pixel units in an array and a low-voltage detection unit, wherein the low-voltage detection unit is used for a sub-pixel in the plurality of sub-pixel units When a source drive voltage of a cell is lower than a threshold voltage, an output signal is rendered inactive; and

A control circuit is used for driving the OLED pixel array module and includes a power module, a light-emitting driving unit and a power enabling unit, wherein the power module is used when an enabling signal is in an active state providing a set of power supply voltages to each of the sub-pixel units, and turning off the set of power supply voltages when the enabling signal is in an inactive state; the light-emitting driving unit is used for generating a pulse modulation signal to enable the power supply a unit and each of the sub-pixel units; and the power enabling unit is used for making the enabling signal present the enabling signal when the level of the pulse modulation signal is logic 0 and the output signal presents the inactive state inactive state.

In one embodiment, the low voltage detection unit is a logic AND gate, and the power enable unit is a logic OR gate.

In one embodiment, the sub-pixel unit includes a first PMOS transistor, a second PMOS transistor, a third PMOS transistor, and an OLED element in a stacked configuration, wherein the stacked group The state system is coupled between the set of supply voltages; the gates of the first PMOS transistor and the third PMOS transistor are coupled to the pulse modulation signal, and the gate of the second PMOS transistor is coupled to one of the source driving voltage and provide the voltage of the gate to the low voltage detection unit.

In one embodiment, the sub-pixel unit includes a first PMOS transistor, a second PMOS transistor, a third PMOS transistor, and an OLED element in a stacked configuration, and a comparator, wherein , the stacking configuration is coupled between the set of supply voltages; the gates of the first PMOS transistor and the third PMOS transistor are coupled to the pulse modulation signal, the second PMOS transistor is The gate is coupled to a source driving voltage; the positive input terminal of the comparator is coupled to the gate of the second PMOS transistor, the negative input terminal is coupled to a threshold voltage, and the output terminal provides a low voltage indication signal to the The low-voltage detection unit, wherein when the voltage of the positive input terminal is lower than the threshold voltage, the low-voltage indication signal presents a state of logic 0.

In a possible embodiment, the information processing device may be a portable computer or a smart handheld device.

Please refer to FIG. 1 , which shows a block diagram of an embodiment of an OLED display with pixel protection function of the present invention. As shown in FIG. 1 , an OLED display 100 includes an OLED pixel array module 110 and a control circuit 120 .

The OLED pixel array module 110 includes n*m sub-pixel units 111 and a logic AND gate 112 .

Each sub-pixel unit 111 has an OLED element and is provided with a working voltage by a voltage difference between a positive supply voltage ELVDD and a reference ground voltage ELVSS. During operation, each sub-pixel unit 111 determines the operating current of the OLED device according to a source driving voltage _VSR [i,j] and a pulse modulation signal EM, and simultaneously provides a power-off indication signal PD[ i,j], where i is an integer between 1 and n, n is an integer greater than 1, j is an integer between 1 and m, m is an integer greater than 1, and the power-off indication signal PD[i, j] represents an active state (in this embodiment, the active state is logic 0) when the source drive voltage V _SR [i,j] is lower than a threshold voltage.

The logic AND gate 112 is used to perform a logic AND operation on the n*m power-off indication signals PD[1,1]-PD[n,m] to generate a power-off signal PD, wherein when the n*m power-off indication signals PD[1,1]-PD[n,m] When any one of the electrical indication signals PD[1,1]-PD[n,m] assumes an active state (logic 0), the power-off signal PD exhibits an active state (logic 0).

The control circuit 120 includes a power module 121 , a light-emitting driving unit 122 , a source driving unit 123 and a logic OR gate 124 .

The power module 121 is used to output the positive supply voltage ELVDD and the reference ground voltage ELVSS when the enable signal EN is in an active state (logic 1), and turn off the positive supply when the enable signal EN is in an inactive state (logic 0). Voltage ELVDD and reference ground voltage ELVSS.

The light-emitting driving unit 122 is used for generating the pulse modulation signal EM to transmit to the OLED pixel array module 110 and the logic OR gate 124 .

The source driving unit 123 is used for generating n*m source driving voltages V _SR [1,1]-V _SR [n,m according to the display data signal provided by a timing controller (not shown in FIG. 1 ) ], wherein the timing controller can be located outside the control circuit 120 or included in the control circuit 120. When the OLED pixel array module 110 is a small-sized display module, the source driving unit 123 can be a single source When the OLED pixel array module 110 is a large-sized display module, the source driving unit 123 can be realized by a plurality of source driving ICs.

The logical OR gate 124 is used to perform a logical OR operation on the power-off signal PD and the pulse modulation signal EM to generate the enable signal EN, wherein, when the power-off signal PD and the pulse modulation signal EM are both active (logic 0), the enable signal EN exhibits an inactive state (logic 0) to drive the power module 121 to turn off the positive supply voltage ELVDD and the reference ground voltage ELVSS. Alternatively, the logic OR gate 124 may be a discrete component or integrated into a source driver IC or a timing controller.

In addition, please refer to FIG. 2 a , which illustrates a circuit diagram of an embodiment of the sub-pixel unit 111 of the OLED display of FIG. 1 . As shown in FIG. 2a, the sub-pixel unit 111 includes a first PMOS transistor 111a, a second PMOS transistor 111b, a third PMOS transistor 111c, and an OLED element 111d in a stacked configuration, wherein the The stacked configuration is coupled between the positive supply voltage ELVDD and the reference ground voltage ELVSS; the gates of the first PMOS transistor 111a and the third PMOS transistor 111c are coupled to the pulse modulation signal EM, and the second PMOS transistor 111b The gate is coupled to a source driving voltage _VSR [i,j] and provides a power-off indication signal PD[i,j].

In addition, please refer to FIG. 2 b , which shows a circuit diagram of another embodiment of the sub-pixel unit 111 of the OLED display of FIG. 1 . As shown in FIG. 2b, the sub-pixel unit 111 includes a first PMOS transistor 111a, a second PMOS transistor 111b, a third PMOS transistor 111c, and an OLED element 111d in a stacked configuration, and a comparison The device 111e, wherein the stacked configuration is coupled between the positive supply voltage ELVDD and the reference ground voltage ELVSS; the gates of the first PMOS transistor 111a and the third PMOS transistor 111c are coupled to the pulse modulation signal EM, The gate of the second PMOS transistor 111b is coupled to a source driving voltage V _SR [i,j]; the positive input terminal of the comparator 111e is coupled to the gate of the second PMOS transistor 111b, and the negative input terminal is coupled to a threshold voltage V _REF , the output terminal provides a power-off indication signal PD[i,j], wherein when the voltage of the positive input terminal is lower than the threshold voltage V _REF , the power-off indication signal PD[i,j] presents a logic 0 state.

According to the above arrangement, if a source driving voltage V _SR [i, j] is abnormal, the logical AND gate 112 will output a logical 0 to the logical OR gate 124 . If the level of the pulse modulation signal EM is logic 1 at this time, the channels of the first PMOS transistor 111a and the third PMOS transistor 111c will be disconnected, so even if the power module 121 still outputs the positive supply voltage ELVDD normally and the reference ground voltage ELVSS, the sub-pixel unit 111 will not generate a large current; on the contrary, if the level of the pulse modulation signal EM is logic 0 at this time, due to the first PMOS transistor 111a and the third PMOS transistor 111c Therefore, if the power supply module 121 still outputs the positive supply voltage ELVDD and the reference ground voltage ELVSS normally, the sub-pixel unit 111 will have the risk of generating a large current. Therefore, the logic OR gate 124 is at this time. The enable signal EN is rendered inactive (logic 0) to drive the power module 121 to turn off the positive supply voltage ELVDD and the ground reference voltage ELVSS, so as to protect the OLED pixel array module 110 . That is, the technical solution of the OLED display with pixel protection function of the present invention can be described as follows:

(1) It includes an OLED pixel array module and a control circuit;

(2) The OLED pixel array module includes a plurality of sub-pixel units in an array and a low-voltage detection unit, wherein the low-voltage detection unit is used for a sub-pixel unit in the plurality of sub-pixel units When a source driving voltage of a pixel unit is lower than a threshold voltage, an output signal is rendered inactive; and

(3) The control circuit is used to drive the OLED pixel array module and includes a power module, a light-emitting driving unit and a power enabling unit, wherein the power module is used for presenting an enabling signal when A set of power supply voltages are provided to each of the sub-pixel units in an active state, and the set of power supply voltages are turned off when the enabling signal is in an inactive state; the light-emitting driving unit is used for generating a pulse modulation signal to the a power enable unit and each of the sub-pixel units; and the power enable unit is used for enabling the enable signal when the level of the pulse modulation signal is logic 0 and the output signal exhibits the inactive state The inactive state is presented.

According to the above description, the present invention further provides an information processing device. Please refer to FIG. 3 , which shows a block diagram of an embodiment of the information processing apparatus of the present invention. As shown in FIG. 3 , an information processing device 200 has a central processing unit 210 and an OLED display 220 , wherein the central processing unit 210 is used for communicating with the OLED display 220 and the OLED display 220 is realized by the OLED display 100 . In addition, the information processing device 200 can be a portable computer or a smart handheld device.

According to the above description, the present invention can provide the following advantages:

1. The OLED display with pixel protection function of the present invention can prevent the OLED panel from being burned by turning off the power supply when an abnormal condition occurs in the data voltage signal transmission between the display control circuit and the OLED panel.

2. Since the information processing device of the present invention has the aforementioned OLED display, the power supply can be turned off when the data voltage signal transmission between the display control circuit and the OLED panel is abnormal to prevent the OLED panel from being burned.

What is disclosed in the present invention is one of the preferred embodiments, and any partial changes or modifications originating from the technical idea of the present invention and easily inferred by those skilled in the art are within the scope of the patent right of the present invention.

To sum up, regardless of the purpose, means and effect of this case, it shows that it is completely different from the conventional technology, and its first invention is suitable for practical use, and indeed meets the patent requirements of the invention. Society is to pray for the best.

100: OLED display 110: OLED pixel array module 111: Sub-pixel unit 111a: the first PMOS transistor 111b: Second PMOS transistor 111c: the third PMOS transistor 111d: OLED components 111e: Comparator 112: Logic and Gates 120: Control circuit 121: Power Module 122: Light-emitting drive unit 123: source drive unit 124: logical OR gate 200: Information processing device 210: Central Processing Unit 220: OLED display

In order to further disclose the specific technical content of the present invention, please refer to the drawings first, wherein: FIG. 1 is a block diagram illustrating an embodiment of an OLED display with pixel protection function of the present invention. FIG. 2a shows a circuit diagram of an embodiment of a sub-pixel unit of the OLED display of FIG. 1 . FIG. 2b shows a circuit diagram of another embodiment of the sub-pixel unit of the OLED display of FIG. 1 . FIG. 3 is a block diagram illustrating an embodiment of the information processing apparatus of the present invention.

100: OLED display

110: OLED pixel array module

111: Sub-pixel unit

112: Logic and Gates

120: Control circuit

121: Power Module

122: Light-emitting drive unit

123: source drive unit

124: logical OR gate

Claims (12)

An OLED display with pixel protection function, which has: an OLED pixel array module, which includes a plurality of sub-pixel units in an array and a low voltage detection unit, wherein the low voltage detection unit is used for In the plurality of sub-pixel units, a source driving voltage of a sub-pixel unit is lower than a threshold voltage to make an output signal in an inactive state; and a control circuit is used to drive the OLED pixel array module , and is used to provide a set of supply voltages to each of the sub-pixel units when an enable signal is in an active state, and to turn off the set of supply voltages when the enable signal is in an inactive state, wherein the enable The signal exhibits the inactive state when the output signal exhibits the inactive state and the level of a pulse modulation signal is logic 0. The OLED display with pixel protection function described in claim 1, wherein the low voltage detection unit is a logic and gate. The OLED display with pixel protection function described in claim 1, wherein the control circuit includes a power module, a light-emitting driving unit and a power enabling unit, wherein the power module is used for The set of supply voltages are provided when the enable signal is in the active state, and the set of supply voltages are turned off when the enable signal is in the inactive state; the light-emitting driving unit is used for generating the pulse modulation signal to The power enabling unit and each of the sub-pixel units; and the power enabling unit is used for generating the enabling signal. The OLED display with pixel protection function as described in claim 3, wherein the power enabling unit is a logic OR gate. The OLED display with pixel protection function as described in claim 1, wherein the sub-pixel unit comprises a first PMOS transistor, a second PMOS transistor, a third PMOS transistor in a stacked configuration PMOS transistors and an OLED device, wherein the stacked configuration is coupled between the set of supply voltages; the gates of the first PMOS transistor and the third PMOS transistor are coupled to the pulse modulation signal, The gate of the second PMOS transistor is coupled to a source driving voltage and provides the gate voltage to the low voltage detection unit. The OLED display with pixel protection function as described in claim 1, wherein the sub-pixel unit comprises a first PMOS transistor, a second PMOS transistor, a third PMOS transistor in a stacked configuration PMOS transistor and an OLED element, and a comparator, wherein the stacked configuration is coupled between the set of supply voltages; the gates of the first PMOS transistor and the third PMOS transistor are coupled Connected to the pulse modulation signal, the gate of the second PMOS transistor is coupled to a source driving voltage; the positive input terminal of the comparator is coupled to the gate of the second PMOS transistor, and the negative input terminal is coupled to Connected to the threshold voltage, the output terminal provides a low voltage indication signal to the low voltage detection unit, wherein when the voltage of the positive input terminal is lower than the threshold voltage, the low voltage indication signal presents a logic 0 state. An information processing device has a central processing unit and an OLED display, wherein the central processing unit is used for communicating with the OLED display, and the OLED display has: an OLED pixel array module, which includes an array of A plurality of sub-pixel units and a low-voltage detection unit, wherein the low-voltage detection unit is used when a source driving voltage of a sub-pixel unit in the plurality of sub-pixel units is lower than a threshold voltage making an output signal in an inactive state; and a control circuit for driving the OLED pixel array module and for providing a set of power supply voltages to each of the sub-pixels when an enabling signal is in an active state unit, and shutting off the set of supply voltages when the enable signal exhibits an inactive state, wherein the enabling signal is when the output signal exhibits the inactive state and a level of a pulse modulation signal is logic 0 The inactive state is presented. The information processing device as described in claim 7, wherein the control circuit includes a power module, a light-emitting driving unit and a power enable unit, wherein the power module is used for the enable signal Providing the set of power supply voltages when the active state is present, and turning off the set of power supply voltages when the enabling signal presents the inactive state; the light-emitting driving unit is used for generating the pulse modulation signal to enable the power supply The unit and each of the sub-pixel units; and the power enabling unit are used for generating the enabling signal. The information processing device of claim 8, wherein the low voltage detection unit is a logic AND gate, and the power enabling unit is a logic OR gate. The information processing device of claim 7, wherein the sub-pixel unit comprises a first PMOS transistor, a second PMOS transistor, a third PMOS transistor and a stacked configuration. An OLED device, wherein the stacked configuration is coupled between the set of supply voltages; the gates of the first PMOS transistor and the third PMOS transistor are coupled to the pulse modulation signal, and the second PMOS transistor The gate of the transistor is coupled to a source driving voltage and provides the gate voltage to the low voltage detection unit. The information processing device of claim 7, wherein the sub-pixel unit comprises a first PMOS transistor, a second PMOS transistor, a third PMOS transistor and a stacked configuration. an OLED element and a comparator, wherein the stacking configuration is coupled between the set of supply voltages; the gates of the first PMOS transistor and the third PMOS transistor are coupled to the pulse modulation The gate of the second PMOS transistor is coupled to a source driving voltage; the positive input terminal of the comparator is coupled to the gate of the second PMOS transistor, and the negative input terminal is coupled to the threshold voltage , the output terminal provides a low voltage indication signal to the low voltage detection unit, wherein when the voltage of the positive input terminal is lower than the threshold voltage, the low voltage indication signal presents a state of logic 0. The information processing device according to any one of items 7 to 11 of the scope of the application is a portable computer or a smart handheld device.

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