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CN100359551C - Display device and power supply unit - Google Patents

Display device and power supply unit Download PDF

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CN100359551C
CN100359551C CNB2005101193394A CN200510119339A CN100359551C CN 100359551 C CN100359551 C CN 100359551C CN B2005101193394 A CNB2005101193394 A CN B2005101193394A CN 200510119339 A CN200510119339 A CN 200510119339A CN 100359551 C CN100359551 C CN 100359551C
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voltage
value
unit
display
supply unit
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CN1753070A (en
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胡硕修
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Optoelectronic Science Co ltd
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AU Optronics Corp
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Abstract

A display device includes a display panel, a first voltage supply unit, a second voltage supply unit, and a detection unit. The first voltage supply unit provides a first voltage to the display panel. The second voltage supply unit outputs a second voltage to the display panel according to the control signal. The detection unit detects a value of the first voltage and generates a control signal when detecting a change in the value of the first voltage.

Description

Display device and supply unit
Technical field
The invention relates to a kind of supply unit, particularly, be applicable to display panel relevant for a kind of supply unit.
Background technology
The 1st figure is the known organic light emitting display of expression (organic light emitting display, OLED) Zhuan Zhi a panel synoptic diagram.Panel 1 comprises data driver 10, scanner driver 11 and array of display 12.Many data line D of data driver 10 controls 1To D n, and scanner driver 11 control multi-strip scanning line S 1To S mArray of display 12 is by staggered in twos data line D 1To D nAnd sweep trace S 1To S mForm, and each staggered data line and display unit of sweep trace control, for example, data line D 1With sweep trace S 1Control display unit 100.As shown in the figure, the equivalent electrical circuit of display unit 100 (other display unit is also identical) comprises switching transistor T10, reservior capacitor C10, driving transistors T11 and light emitting diode (light-emitting diode, LED) D10.
The OLED device is the flat-panel screens of emissive type.The light source of LED D10 is from converting by electric current I itself, so the brightness of LED D10 then can be provided by the electric current I of adjusting driving transistors T11 and being provided.In the panel of OLED device, because the problem of driving transistors T11 process drift must be adjusted voltage Vdd so that the brightness that all display units provided of array of display 12 reaches set standard.Generally speaking, the adjusting range of voltage Vdd is approximately 2V.
Consult the 2nd figure, the voltage Vdd of each pixel cell and Vss are provided by external power source device 2, and therefore, supply unit 2 provides all LED of array of display 12 luminous required consumed power.The node of all voltage Vdd connects and is coupled in together in array of display 12, and the node of all voltage Vss also is coupled in together.The node of the node of voltage Vdd and voltage Vss directs into the outer rim of panel 1 respectively, and is connected to external power source device 2 by lead.
Known external power source device can only be adjusted voltage Vdd, or adjusts voltage Vdd and Vss respectively.3a figure is the known external power source device 2 of expression, and it adjusts voltage Vdd.Consult 3a figure, external power source device 2 comprises dc power converter 31 and 32 and adjustment unit 33 and 34, and wherein, dc power converter 31 and 32 provides voltage Vdd and Vss respectively.Adjustment unit 33 and 34 all comprises two impedors (R).The resistance value of the impedor R1 of adjustment unit 33 is adjustable, and the resistance value of impedor R2 is fixed.When dc power converter 31 provides voltage Vdd to panel 1, voltage Vdd by adjustment unit 33 impedor R1 and after R2 pass through dividing potential drop, acquisition feedback voltage V f1.31 of dc power converter decide voltage Vdd according to feedback voltage V f1.In the time voltage Vdd must being adjusted, change feedback voltage V f1 by the resistance value of adjusting impedor R1 because of the problem of driving transistors T11 process drift.Therefore, 31 of dc power converter can change voltage Vdd according to the feedback voltage V f1 after changing.Consult 3a figure, in this known technology, dc power converter 32 provides fixing Vss, so the impedor R3 of adjustment unit 34 and the resistance value of R4 are all fixed.Thus, for the panel that only needs 10V cross-pressure (between voltage Vdd and the Vss) originally, the cross-pressure of whole front panel can change between 10V to 12V.Therefore, the consumed power of panel increases by 20% through meeting.
3b figure is the known external power source device 3 of expression, and it adjusts voltage Vdd and Vss respectively.Consult 3b figure, external power source device 3 comprises dc power converter 35 and 36 and adjustment unit 37 and 38, and wherein, dc power converter 35 and 36 provides voltage Vdd and Vss respectively. Adjustment unit 37 and 38 all comprises two impedor R.The resistance value of the impedor R5 of adjustment unit 37 is adjustable, and the resistance value of impedor R6 is fixed.Dc power converter 35 and adjustment unit 37 are carried out respectively and dc power converter 31 and adjustment unit 33 identical operations.In the time voltage Vdd must being adjusted, change feedback voltage V f1 by the resistance value of adjusting impedor R5, and dc power converter 35 changes voltage Vdd according to the feedback voltage V f1 after changing because of the problem of driving transistors T11 process drift.After adjusting voltage Vdd, consume 20% power for fear of panel more than 1, therefore also need adjust voltage Vss, make that the cross-pressure between voltage Vdd and Vss maintains 10V.Consult 3b figure, in this known technology, the resistance value of the impedor R7 of adjustment unit 38 is adjustable, and the resistance value of impedor R8 is fixed.Dc power converter 36 and adjustment unit 38 are carried out respectively and dc power converter 31 and adjustment unit 33 identical operations.After adjusting voltage Vdd, changing feedback voltage V f2 because of the problem of driving transistors T11 process drift, and dc power converter 36 changes voltage Vss according to the feedback voltage V f2 after changing by the resistance value of adjusting impedor R5.According to the known external power source device of 3b figure, when adjusting voltage Vdd, must adjust voltage Vss in addition because of the problem of driving transistors T11 process drift, therefore increase the program of producing the OLED device.
Summary of the invention
In view of this, in order to address the above problem, fundamental purpose of the present invention is to provide a kind of display device, comprises display panel, the first voltage feeding unit, second voltage feeding unit and the detecting unit.The first voltage feeding unit provides first voltage to display panel.The second voltage feeding unit provides second voltage to this display panel, and changes the value of second voltage according to control signal.Detecting unit detects the value of first voltage, and when the value that detects first voltage changes, produces control signal.Wherein, the second voltage feeding unit changes second voltage according to this control signal, so that the variable quantity of the variable quantity of first voltage and second voltage equates.
In certain embodiments, when the value of first voltage increased, the value of second voltage increased; When the value of first voltage reduced, the value of this second voltage reduces to be increased.In addition, the variable quantity of first voltage equates with the variable quantity of second voltage.
The present invention also provides a kind of display device, comprises display panel, the first voltage feeding unit, second voltage feeding unit and the detecting unit.The first voltage feeding unit provides first voltage to display panel.The second voltage feeding unit provides second voltage to this display panel, and changes the value of second voltage according to control signal.Detecting unit detects the value of first and second voltage and calculates cross-pressure value between first and second voltage.When the cross-pressure value of calculating acquisition is not equal to reference to the cross-pressure value, detecting unit output control signal.Wherein, the second voltage feeding unit changes second voltage according to this control signal, so that the cross-pressure value between first and second voltages equals with reference to the cross-pressure value.
The present invention also provides a kind of supply unit that is used for display device, comprising: the first voltage feeding unit is used to provide first voltage; The second voltage feeding unit is used to provide second voltage to this display panel, and changes the value of second voltage according to control signal; And detecting unit, be used to detect the value of this first voltage, and when the value that detects this first voltage changes, produce this control signal, wherein, the second voltage feeding unit changes second voltage according to this control signal, so that the variable quantity of the variable quantity of first voltage and second voltage equates.
The present invention also provides a kind of supply unit that is used for display device, comprising: the first voltage feeding unit is used to provide first voltage; The second voltage feeding unit is used to provide second voltage to this display panel, and changes the value of second voltage according to control signal; And detecting unit, be used to detect the value of this first and second voltage and calculate cross-pressure value between this first and second voltage, wherein, when this cross-pressure value of calculating acquisition is not equal to reference to the cross-pressure value, this detecting unit is exported this control signal, wherein, the second voltage feeding unit changes second voltage according to this control signal, so that the cross-pressure value between first and second voltages equals with reference to the cross-pressure value.
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, a preferred embodiment cited below particularly, and cooperate appended graphicly, be described in detail below.
Description of drawings
The 1st figure represents the panel synoptic diagram of known OLED device.
The 2nd figure represents in the known OLED display device, panel and external power source schematic representation of apparatus.
3a and the known external power source device of 3b figure expression.
The 4th figure represents first embodiment of display device of the present invention.
The 5th figure represents second embodiment of display device of the present invention.
Label declaration:
1～panel; 2,3～external power source device; 10～data driver; 11～scanner driver; 12～array of display; 100～display unit; C10～reservior capacitor; D10～LED; D 1... D n～data line; S 1... S m～sweep trace; T10～switching transistor; T11～driving transistors;
31,32,35,36～dc power converter; 33,34,37,38～adjustment unit; R1...R8～impedor;
4,5～display device; 40,50～display panel; 41,51～supply unit; 410,510～Vdd voltage feeding unit; 411,511～Vss voltage feeding unit; 412,512～detecting unit; 413,513～adjustment unit.
Embodiment
The 4th figure is the display device of expression first embodiment of the invention.Consult the 4th figure, display device 4 comprises display panel 40 and supply unit 41.In the present embodiment, display panel 40 has the OLED array of display, and its structure is shown in the 1st figure, and each display unit of array of display all needs voltage Vdd and Vss.In this embodiment, the cross-pressure between voltage Vdd and Vss is 10V.Supply unit 41 comprises Vdd voltage feeding unit 410 and Vss voltage feeding unit 411, is used for providing respectively voltage Vdd and Vss to display panel 40.In the present embodiment, voltage feeding unit 410 and 411 is dc power converter (DC/DC converter), and voltage Vdd is positive voltage, and voltage Vss is a negative voltage.Supply unit 41 also comprises detecting unit 412 and adjustment unit 413.Adjustment unit 413 detects the value of voltage Vdd, and the adjustment signal S1 of output correspondence makes voltage feeding unit 410 continue the voltage Vdd that output equates to voltage feeding unit 410.When desire was adjusted voltage Vdd because of the problem of the driving transistors process drift in the display unit, adjustment unit 413 changes adjusted signal S1.410 of voltage feeding units change the value of voltage Vdd according to the adjustment signal S1 after changing, in other words, when adjusting signal S1 and change, 410 values that change voltage Vdd of voltage feeding unit.
Detecting unit 412 also detects the value of voltage Vdd, when the value that detects voltage Vdd changes, produces corresponding control signal S2.Voltage feeding unit 411 is according to the value of this control signal S2 with decision voltage Vss, so that the cross-pressure between voltage Vdd and Vss maintains 10V.Voltage Vdd increases, and then voltage Vss increases; Voltage Vdd reduces, and then voltage Vss reduces, and in other words, the variable quantity of voltage Vdd equates with the variable quantity of voltage Vss.
According to the first embodiment of the present invention, when the value of voltage Vdd changed, detecting unit 412 provided control signal S2 to voltage feeding unit 411 simultaneously, with the value of automatic change voltage Vss.Therefore, the cross-pressure between voltage Vdd and Vss can not change because of the adjustment of voltage Vdd, avoids the increase of power consumption by this.
The 5th figure is the display device of expression second embodiment of the invention.Consult the 5th figure, display device 5 comprises display panel 50 and supply unit 51.In the present embodiment, display panel 50 has the OLED array of display, and its structure is shown in the 1st figure, and each display unit of array of display all needs voltage Vdd and Vss.In this embodiment, the cross-pressure between voltage Vdd and Vss is 10V.Supply unit 51 comprises Vdd voltage feeding unit 510 and Vss voltage feeding unit 511, is used for providing respectively voltage Vdd and Vss to display panel 50.In the present embodiment, voltage feeding unit 510 and 511 is dc power converter (DC/DC converter), and voltage Vdd is positive voltage, and voltage Vss is a negative voltage.Supply unit 51 also comprises detecting unit 512 and adjustment unit 513.Adjustment unit 513 detects the value of voltage Vdd, and the adjustment signal S3 of output correspondence makes voltage feeding unit 510 continue the voltage Vdd that output equates to voltage feeding unit 510.When desire was adjusted voltage Vdd because of the problem of the driving transistors process drift in the display unit, adjustment unit 513 changes adjusted signal S3.510 of voltage feeding units change the value of voltage Vdd according to the adjustment signal S3 after changing, in other words, when adjusting signal S3 and change, 510 values that change voltage Vdd of voltage feeding unit.
Detecting unit 512 detects the value of voltage Vdd and the value of voltage Vss simultaneously.Detecting unit 512 has with reference to the cross-pressure value, in the present example, is 10V with reference to the cross-pressure value.Detecting unit 512 detects the value of voltage Vdd and the value of voltage Vss, and cross-pressure value between calculating voltage Vdd and Vss.When desire is adjusted voltage Vdd because of the problem of the driving transistors process drift in the display unit, calculate the cross-pressure value that obtains and be not equal to this, 512 control signal S4 that produce correspondence of detecting unit with reference to cross-pressure value (10V).Voltage feeding unit 511 decides the value of voltage Vss according to this control signal S4, so that the cross-pressure between voltage Vdd and Vss maintains 10V.
According to a second embodiment of the present invention, change and when making cross-pressure value between voltage Vdd and Vss change, detecting unit 512 provides control signal S4 to voltage feeding unit 511 simultaneously, with the value of automatic change voltage Vss when the value of voltage Vdd.Therefore, the cross-pressure between voltage Vdd and Vss can not change because of the adjustment of voltage Vdd, avoids the increase of power consumption by this.
Though the present invention discloses as above with preferred embodiment; so it is not to be used to limit scope of the present invention; any those skilled in the art; without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is as the criterion when looking appended the claim scope person of defining.

Claims (18)

1.一种显示装置，包括：1. A display device, comprising: 显示面板；display panel; 第一电压供应单元，用于提供第一电压至该显示面板；a first voltage supply unit, configured to provide a first voltage to the display panel; 第二电压供应单元，用于提供第二电压至该显示面板，并且根据控制信号改变第二电压的值；以及a second voltage supply unit, configured to provide a second voltage to the display panel, and change the value of the second voltage according to a control signal; and 检测单元，用于检测该第一电压的值，且当检测到该第一电压的值改变时，产生该控制信号，a detection unit, configured to detect the value of the first voltage, and generate the control signal when a change in the value of the first voltage is detected, 其中，第二电压供应单元根据该控制信号改变第二电压，以使得第一电压的变化量和第二电压的变化量相等。Wherein, the second voltage supply unit changes the second voltage according to the control signal, so that the variation of the first voltage is equal to the variation of the second voltage. 2.根据权利要求1所述的显示装置，还包括调整单元，提供调整信号至该第一电压供应单元，以改变该第一电压的值。2. The display device according to claim 1, further comprising an adjustment unit providing an adjustment signal to the first voltage supply unit to change the value of the first voltage. 3.根据权利要求1所述的显示装置，其中，该显示面板还包括由多个显示单元所构成的显示阵列，该第一及第二电压供应单元分别提供该第一及第二电压至每一该显示单元。3. The display device according to claim 1, wherein the display panel further comprises a display array composed of a plurality of display units, and the first and second voltage supply units respectively provide the first and second voltages to each a display unit. 4.根据权利要求1所述的显示装置，其中，该第一电压为正电压，且该第二电压为负电压。4. The display device according to claim 1, wherein the first voltage is a positive voltage, and the second voltage is a negative voltage. 5.根据权利要求1所述的显示装置，其中，该第一及第二电压供应单元为直流电源转换器。5. The display device according to claim 1, wherein the first and second voltage supply units are DC power converters. 6.一种显示装置，包括：6. A display device comprising: 显示面板；display panel; 第一电压供应单元，用于提供第一电压至该显示面板；a first voltage supply unit, configured to provide a first voltage to the display panel; 第二电压供应单元，用于提供第二电压至该显示面板，并且根据控制信号改变第二电压的值；以及a second voltage supply unit, configured to provide a second voltage to the display panel, and change the value of the second voltage according to a control signal; and 检测单元，用于检测该第一及第二电压的值并计算该第一与第二电压间的跨压值，其中，当计算获得的该跨压值不等于参考跨压值时，该检测单元输出该控制信号，The detection unit is used to detect the values of the first and second voltages and calculate the cross-voltage value between the first and second voltages, wherein, when the calculated cross-voltage value is not equal to the reference cross-voltage value, the detection unit outputs the control signal, 其中，第二电压供应单元根据该控制信号改变第二电压，以使得第一和第二电压间的跨压值等于参考跨压值。Wherein, the second voltage supply unit changes the second voltage according to the control signal, so that the cross-voltage value between the first and second voltages is equal to the reference cross-voltage value. 7.根据权利要求6所述的显示装置，还包括调整单元，提供调整信号至该第一电压供应单元，以改变该第一电压的值。7. The display device according to claim 6, further comprising an adjustment unit providing an adjustment signal to the first voltage supply unit to change the value of the first voltage. 8.根据权利要求6所述的显示装置，其中，该显示面板还包括由多个显示单元所构成的显示阵列，该第一及第二电压供应单元分别提供该第一及第二电压至每一该显示单元。8. The display device according to claim 6, wherein the display panel further comprises a display array composed of a plurality of display units, and the first and second voltage supply units respectively provide the first and second voltages to each a display unit. 9.根据权利要求6所述的显示装置，其中，该第一电压为正电压，且该第二电压为负电压。9. The display device according to claim 6, wherein the first voltage is a positive voltage, and the second voltage is a negative voltage. 10.根据权利要求6所述的显示装置，其中，该第一及第二电压供应单元为直流电源转换器。10. The display device according to claim 6, wherein the first and second voltage supply units are DC power converters. 11.一种用于显示装置的电源装置，包括：11. A power supply device for a display device, comprising: 第一电压供应单元，用于提供第一电压；a first voltage supply unit, configured to provide a first voltage; 第二电压供应单元，用于提供第二电压至该显示装置，并且根据控制信号改变第二电压的值；以及a second voltage supply unit, configured to provide a second voltage to the display device, and change the value of the second voltage according to the control signal; and 检测单元，用于检测该第一电压的值，且当检测到该第一电压的值改变时，产生该控制信号，a detection unit, configured to detect the value of the first voltage, and generate the control signal when a change in the value of the first voltage is detected, 其中，第二电压供应单元根据该控制信号改变第二电压，以使得第一电压的变化量和第二电压的变化量相等。Wherein, the second voltage supply unit changes the second voltage according to the control signal, so that the variation of the first voltage is equal to the variation of the second voltage. 12.根据权利要求11所述的电源装置，还包括调整单元，提供调整信号至该第一电压供应单元，以改变该第一电压的值。12. The power supply device according to claim 11, further comprising an adjustment unit providing an adjustment signal to the first voltage supply unit to change the value of the first voltage. 13.根据权利要求11所述的电源装置，其中，该第一电压为正电压，且该第二电压为负电压。13. The power supply device according to claim 11, wherein the first voltage is a positive voltage, and the second voltage is a negative voltage. 14.根据权利要求11所述的电源装置，其中，该第一及第二电压供应单元为直流电源转换器。14. The power supply device according to claim 11, wherein the first and second voltage supply units are DC power converters. 15.一种用于显示装置的电源装置，包括：15. A power supply device for a display device, comprising: 第一电压供应单元，用于提供第一电压；a first voltage supply unit, configured to provide a first voltage; 第二电压供应单元，用于提供第二电压至该显示装置，并且根据控制信号改变第二电压的值；以及a second voltage supply unit, configured to provide a second voltage to the display device, and change the value of the second voltage according to the control signal; and 检测单元，用于检测该第一及第二电压的值并计算该第一与第二电压间的跨压值，其中，当计算获得的该跨压值不等于参考跨压值时，该检测单元输出该控制信号，The detection unit is used to detect the values of the first and second voltages and calculate the cross-voltage value between the first and second voltages, wherein, when the calculated cross-voltage value is not equal to the reference cross-voltage value, the detection unit outputs the control signal, 其中，第二电压供应单元根据该控制信号改变第二电压，以使得第一和第二电压间的跨压值等于参考跨压值。Wherein, the second voltage supply unit changes the second voltage according to the control signal, so that the cross-voltage value between the first and second voltages is equal to the reference cross-voltage value. 16.根据权利要求15所述的电源装置，还包括调整单元，提供调整信号至该第一电压供应单元，以改变该第一电压的值。16. The power supply device according to claim 15, further comprising an adjustment unit providing an adjustment signal to the first voltage supply unit to change the value of the first voltage. 17.根据权利要求15所述的电源装置，其中，该第一电压为正电压，且该第二电压为负电压。17. The power supply device according to claim 15, wherein the first voltage is a positive voltage, and the second voltage is a negative voltage. 18.根据权利要求15所述的电源装置，其中，该第一及第二电压供应单元为直流电源转换器。18. The power supply device according to claim 15, wherein the first and second voltage supply units are DC power converters.
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CN109920372B (en) * 2017-12-12 2021-01-29 京东方科技集团股份有限公司 Display driving module, display device and voltage adjusting method

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US20050116657A1 (en) * 2003-11-27 2005-06-02 Sung-Chon Park Power control apparatus for a display device and method of controlling the same

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