Hybrid electro luminescence panel and driving method thereof

• US 20030059525A1
• Filed: 09/10/2002
• Published: 03/27/2003
• Est. Priority Date: 09/21/2001
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Moon, Seong-Hak
• Granted Patent: US 6,924,603 B2
• Time in Patent Office: Days
• US Class Current: 427/66
• CPC Class Codes: G09G 2300/023 Display panel composed of stacked panels
• CPC Class Codes: G09G 2300/0452 Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
• CPC Class Codes: G09G 2310/0254 Control of polarity reversal in general, other than for liquid crystal displays
• CPC Class Codes: G09G 2310/0256 with the purpose of reversing the voltage across a light emitting or modulating element within a pixel
• CPC Class Codes: G09G 2310/06 Details of flat display driving waveforms
• CPC Class Codes: G09G 2320/043 Preventing or counteracting the effects of ageing
• CPC Class Codes: G09G 3/30 using electroluminescent panels
• CPC Class Codes: G09G 3/3216 using a passive matrix
• CPC Class Codes: G09G 3/3266 Details of drivers for scan electrodes
• CPC Class Codes: G09G 3/3275 Details of drivers for data electrodes
• CPC Class Codes: H10K 59/35 comprising red-green-blue [RGB] subpixels

Abstract

A hybrid electro luminescence (EL) panel and a driving method thereof using advantages of an organic EL panel and inorganic EL panel comprise a first substrate having luminescent substance formed with organic substance, and a second substrate having luminescent substrate formed with inorganic substance, and construct the first substrate and the second substrate to be overlapped with each other, and thereby, a brightness can be improved, the panel can be scaled up, a life span of the panel is increased, and color balance can be controlled easily.

Claims

1. A hybrid electro luminescence (EL) panel comprising:

a first substrate having luminescent substance formed using organic substance; and

a second substrate having luminescent substance formed using inorganic substance,

wherein image displaying surfaces of the first substrate and the second substrate are overlapped with each other.

2. The panel of claim 1, wherein the luminescent substance formed on the first substrate is an organic substance having blue color property, and the luminescent substance formed on the second substrate is an inorganic substance having red color property.

3. The panel of claim 2 further comprising luminescent substance having green color property on one of the first substrate and the second substrate.

4. The panel of claim 3, wherein the luminescent substance having the green color property is an organic substance or an inorganic substance.

5. The panel of claim 1, wherein the first substrate includes blue color organic substances formed as a matrix form, and the second substrate includes red and green color inorganic substances formed as a matrix form.

6. The panel of claim 5, wherein the blue color organic substances are arranged to be overlapped with the green color inorganic substances, or the blue color organic substances are arranged to be overlapped with the red color inorganic substances.

7. The panel of claim 5, wherein the blue color organic substances are arranged with the red and green color inorganic substances.

8. The panel of claim 5, wherein the blue color organic substances are arranged not to be overlapped with the red and green color inorganic substances.

9. The panel of claim 5, wherein the red color inorganic substance, the green color inorganic substance, and the blue color organic substance make a pixel cell.

10. The panel of claim 1, wherein a plurality of data lines and scan lines are formed on the first substrate and on the second substrate, and an image is displayed by luminescence of a cell formed on a crossed portion of the data line and the scan line.

11. The panel of claim 10, wherein the first substrate and the second substrate include pads for electrically connecting to a signal inputted from outer side on an area except the image displaying surface.

12. The panel of claim 11 comprising a data driving unit for supplying data pulse and a scan driving unit for supplying scan pulse through the pads formed on the first and second substrates.

13. The panel of claim 12 further comprising a controller for outputting control signals to the data driving unit and to the scan driving unit.

14. The panel of claim 10, wherein the first substrate comprises:

a first pad for electrically connecting to the data line;

a blue color data driving unit for supplying data pulse through the first pad;

a second pad for electrically connecting with the scan line;

a first scan driving unit for supplying the scan pulse through the second pad.

15. The panel of claim 14, wherein the first scan driving unit comprises:

an eleventh switch connected between a scan voltage source and a scan line;

a thirteenth switch connected between a basic voltage source GND and the scan line;

a twelfth switch connected between a refresh voltage source and the scan line; and

a scan drive integrated circuit (IC) for driving the scan line sequentially.

16. The panel of claim 10, wherein the second substrate comprises:

a third pad for electrically connecting to the data line, a red color data driving unit for supplying data pulse through the third pad, a green color driving unit for supplying the data pulse through the third pad, a fourth pad for electrically connecting to the scan line, and a second scan driving unit for supplying scan pulse to the fourth pad.

17. The panel of claim 16, wherein the second scan driving unit comprises a scan drive IC for selecting the scan line, a fourth switch installed between the scan drive IC and a scan voltage source Vs, a fifth switch installed between the fourth switch and a basic voltage source GND, a capacitor C1 installed on the scan drive IC in a row, and a third switch installed between the capacitor C1 and the basic voltage source GND.

18. The panel of claim 17, wherein the scan drive IC is connected to a plurality of scan lines.

19. The panel of claim 16, wherein the red and green color data is driving units comprise a data drive IC for selecting the data line, a ninth switch installed between the data drive IC and a data voltage source Vd, a tenth switch installed between the ninth switch and a basic voltage source GND, a capacitor C2 installed on the data drive IC in a row, and a eighth switch installed between the capacitor C2 and the basic voltage source.

20. The panel of claim 16, wherein the red and green color data driving units supply positive data pulse to the data line when negative scan pulse is supplied to the scan line, and supply negative data pulse to the data line when positive scan pulse is supplied to the scan line.

21. A hybrid EL panel comprising:

a first substrate having a plurality of red color inorganic substances formed on an image displaying surface as a matrix form;

a scan driving unit for providing the first substrate with scan pulse;

a data driving unit for providing the first substrate with data pulse;

a second substrate having a plurality of blue color organic substances formed as a matrix form so as to be overlapped with the image displaying surface;

a scan driving unit for providing the second substrate with the scan pulse; and

a data driving unit for providing the second substrate with the data pulse.

22. The panel of claim 21, wherein luminescent substance of inorganic material having green color property is formed on the first substrate, or luminescent substance of organic material having green color property is formed on the second substrate.

23. The panel of claim 22 comprising a data line formed on the first substrate for supplying a driving signal to the red color inorganic substance, a scan line formed on the first substrate toward a direction of crossing the data line formed on the first substrate, a data line formed on the second substrate for supplying driving signal to the blue color organic substance and to the green color organic substance, and a scan line formed on the second substrate toward a direction of crossing the data line formed on the second substrate.

24. The panel of claim 23, wherein the scan driving unit supplying the scan pulse to the first substrate supplies the scan pulse of which a polarity is reversed at every frame to the scan line, and the data driving unit supplying the data pulse to the first substrate supplies the data pulse having different polarity from that of the scan pulse to the data line.

25. The panel of claim 23, wherein the scan driving unit supplying the scan pulse to the second substrate supplies refresh pulse for removing the scan pulse having negative polarity and electric charges charged in a cell to the scan line, and the data driving unit supplying the data pulse to the second substrate supplies positive data pulse to the data line when negative scan pulse is supplied to the scan line and supplies negative data pulse to the data line when the scan pulse having positive polarity is supplied to the scan line.

26. A method for driving a hybrid EL panel comprising the steps of:

forming luminescent substance formed with organic substance on a first substrate as a matrix form;

forming luminescent substance formed with inorganic substance on a second substrate as a matrix form;

installing the first substrate and the second substrate so that image displaying surfaces can be overlapped; and

providing the first substrate and the second substrate with scan pulse and data pulse for displaying an image.

27. The method of claim 26, wherein a cell is formed so as to display the image by overlapping the luminescent substance of organic material with the luminescent substance of inorganic material, or the cell is formed so that the luminescent substance of organic material is not overlapped with the luminescent substance of inorganic material to display the image.

28. The method of claim 26, wherein the luminescent substance formed by the organic substance is an organic substance having blue color luminous property, and the luminescent substance formed with the inorganic substance is an inorganic substance having red color luminous property.

29. The method of claim 28, wherein the luminescent substance further comprises organic substance or inorganic substance having green color luminous property.

30. The method of claim 26, wherein the step of providing the scan pulse and the data pulse comprises the steps of:

forming pads for electrically connecting to outer side on the first and second substrates;

supplying data pulse to the first and second substrates through the pads from a data driving unit; and

supplying scan pulse to the first and second substrates through the pads from a scan driving unit.

31. The method of claim 30, wherein the scan driving unit supplies the scan pulse sequentially to the scan lines formed on the first substrate to be overlapped with the organic substance, and to the scan lines formed on the second substrate to be overlapped with the inorganic substance in the step of supplying the scan pulse.

32. The method of claim 31, wherein the first substrate is supplied the scan pulse having negative polarity from the scan driving unit.

33. The method of claim 32, wherein the scan driving unit supplies refresh pulse for removing electric charges charged in a cell after that scan pulse is supplied to the scan pulse.

34. The method of claim 30, wherein the scan pulse supplied to the second substrate is synchronized with the scan pulse supplied to the first substrate in the step of supplying the scan pulse.

35. The method of claim 30, wherein the data driving unit supplies the data pulse synchronized with the scan pulse to the pad connected to the organic substance formed on the first substrate, or supplies data pulse synchronized with the scan pulse to the pad connected to the inorganic substance formed on the second substrate, in the step of supplying the scan pulse and the data pulse.

36. The method of claim 30, wherein the scan driving unit supplying the scan pulse to the first substrate supplies refresh pulse for removing the negative scan pulse and the electric charges charged in the cell to the scan line, and the data driving unit supplying the data pulse to the first substrate supplies positive data pulse to the data line when the scan pulse of negative polarity is supplied to the scan line and supplies negative data pulse to the data line when the scan pulse of positive polarity is supplied to the scan line, in the step of supplying the scan pulse and the data pulse.

37. The method of claim 30, wherein the scan driving unit supplying the scan pulse to the second substrate supplies the scan pulse of which polarity is reversed at every frame to the scan line, and the data driving unit supplying the data pulse to the second substrate supplies the data pulse having different polarity from that of the scan pulse to the data line, in the step of supplying the scan pulse and the data pulse.