Display device

A technology for a display device and a display panel, which is applied in the fields of display devices with voltage drop and scanning circuits, can solve the problems of large parasitic capacitance of column wiring, increased power consumption of data driver, and increased voltage amplitude of column wiring, etc., so as to reduce the amplitude of output voltage. , reduce power consumption, and correct the effect of small errors

Inactive Publication Date: 2006-09-20
HITACHI DISPLAYS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the MIM type electron emission element, since the parasitic capacitance of the column wiring is large, there is a problem that the voltage amplitude of the column wiring increases due to correction, and the power consumption of the data driver constituting the modulation circuit for driving the column wiring increases.

Method used

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Experimental program
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Effect test

Embodiment 1

[0054] figure 1 is a block diagram showing the overall circuit configuration (1) of this embodiment. The display panel 4 includes a back panel, a front panel and side walls (not shown). The backplane has column wiring 1 extending vertically (Y direction), row wiring 2 extending laterally (X direction), and electron emission elements 3 connected to one column wiring and one row wiring. A plurality of column wirings are arranged horizontally, and a plurality of row wirings are arranged vertically. The electron emission element is a MIM type electron emission element. The front plate has a fluorescent film 10 and a back gold 11 formed to cover the fluorescent film 10 . The surface of the back plate on which the electron emission elements 3 are formed is opposed to the surface of the front plate on which the fluorescent surface is formed, and the side walls are arranged on the opposing surfaces of the front plate and the back plate. The panel is internally vented.

[0055] F...

Embodiment 2

[0122] In Embodiment 1 described above, there are cases where an overshoot occurs when the output voltage Gn of the output circuit rises from the non-selection voltage VGL to the selection voltage VGH, making it difficult to control the amount of light emission with high precision.

[0123] The delay caused by the on-resistance of the pMOS selection switch 41 and the wiring capacitance of the row wiring 2, and the delay caused by the wiring capacitance of the pMOS detection switch 43 and the input wiring 46 of the differential amplifier 44 make the input voltage of the differential amplifier 44 change slowly. changes in the output voltage, thereby causing this overshoot.

[0124] In this embodiment, the turning-off timing of the pMOS feedback switch 45 is set later than the turning-on timing of the pMOS selection switch 41 and the pMOS detection switch 43 of the selected row.

[0125] Figure 8 Indicates the output timing of the data driver and the scan driver within one hori...

Embodiment 3

[0131] In this embodiment, the data driver output voltage is corrected in consideration of the resistance Ro2 from the output point of the scan driver to the pixels at both ends in the second embodiment. Figure 9 It is a diagram explaining the row wiring voltage drop and the state of correction at this time.

[0132] exist Figure 9 , mark 3, r, Ro, im and Figure 6 Same, mark iRm', iLm', Vm', Im', VVL', VVR' and Figure 6 iRm, iLm, Vm, Im, VVL, VVR are the same. In addition, Ro2 is the resistance from the output point of the scan driver to the pixels at both ends.

[0133] The row wiring voltage drop Vm' generated in the mth pixel is obtained as follows. The correction values ​​VVL' and VVR' are respectively input to the output circuit of the scan driver, so that the voltage drop at the output point of the scan driver becomes zero, and the output point of the scan driver becomes a virtual point.

[0134] The diode current im of the m-th pixel consists of two components ...

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Abstract

A display device of the invention includes horizontal lines, longitudinal lines, electron emission elements, and a scanning circuit which performs the selection of the horizontal lines. The scanning circuit includes a non-selection voltage switch, a correction selection voltage switch, and an output voltage detection switch for the selected horizontal line for every horizontal line. The display device also includes a differential amplifier which is connected to a correction selection voltage input line, a horizontal line selection voltage line, and a correction selection voltage output line for every plurality of horizontal lines. The invention can suppress a voltage drop of the horizontal lines and, at the same time, can suppress the brightness irregularities of the display device.

Description

technical field [0001] The present invention relates to a scanning circuit for performing selection of horizontal lines of a display panel having a plurality of horizontal lines and a plurality of longitudinal lines. [0002] The present invention relates to a display device for correcting a voltage drop on a scanning line (row wiring), and more particularly to a display device using MIM type electron emission elements. Background technique [0003] Hitherto, as cold cathode electron emission elements, for example, metal / insulator / metal type electron emission elements (hereinafter referred to as "MIM type electron emission elements") have been known. In this MIM type electron emission element, electrons are emitted from the surfaces of the electrodes by applying a voltage to upper and lower electrodes sandwiching an insulating layer. [0004] In this MIM type electron emission device, about 95% of the electrons emitted from the lower electrode flow into the upper electrode ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/20
Inventor 尾崎俊文塚原正久御园生俊树
Owner HITACHI DISPLAYS
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