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Display device and method for driving a display device

A technology for display devices and display panels, applied in static indicators, instruments, etc., can solve the problems of rising LSI cost, feedback, and LSI chip size, and achieve the effect of low-cost display devices

Inactive Publication Date: 2009-10-07
JAPAN DISPLAY INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This means that the high-frequency component is not fed back to the inverting input terminal which is the feedback input of the amplifier 7, which becomes the main cause of overshoot and causes an uncomfortable situation in which the oscillation phenomenon of the amplifier 7 occurs.
[0030] In addition, to form a feedback switch inside the LSI, in order to reduce its on-resistance, it is necessary to increase the size of the switching element, which leads to an increase in the size of the LSI chip, that is, an increase in the cost of the LSI

Method used

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  • Display device and method for driving a display device
  • Display device and method for driving a display device
  • Display device and method for driving a display device

Examples

Experimental program
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Effect test

Embodiment 1

[0049] figure 1 It is the scanning electrode driving circuit diagram of the display device of the present invention, figure 2 is for illustration figure 1 The action waveform diagram of the action.

[0050] exist figure 1 Among them, the reference voltage source 4 is a reference voltage source for determining the scan selection voltage. The output voltage of the reference voltage source 4 is input to the non-inverting input terminal of the amplifier 7 serving as a scan electrode potential correction circuit.

[0051] A scan selection switch 2 having an on-resistance Ron1 serving as a scan electrode potential detection circuit is connected to an output terminal of the amplifier 7, and applies a scan selection potential to the scan electrodes when the scan selection switch 2 is on. At this time, when the scan electrode voltage reaches a predetermined voltage, it becomes a selected state.

[0052] exist figure 2 , at time t=0, the switch control signal Vcont is at a hi...

Embodiment 2

[0069] As a second embodiment of the present invention, a specific value of the on-resistance value of the feedback switch will be described.

[0070] The capacitance 6 (Cp) shown in Embodiment 1 is a capacitance component of one scan wiring. Here, a VGA board (640 dots×RGB×480 lines) is taken as an example for illustration.

[0071] The capacitance Cp of the capacitor 6 is determined by the number of pixels arranged in the horizontal direction. Assuming that the capacitance of one pixel is 20pF, the above-mentioned capacitance value Cp becomes 38400pF.

[0072] In contrast, since the current of the scan selection switch reaches several hundred mA to several A, it is desirable to set the on-resistance Ron1 of the scan selection switch 2 to a low on-resistance value of 1Ω or less. However, the actual on-resistance when the circuit is constituted by LSI is set to several Ω to several tens Ω from the viewpoint of the chip size. Here, when the on-resistance value of the scan se...

Embodiment 3

[0081] As a third embodiment of the present invention, the dimensions of the scan selection switch and the feedback switch in the LSI will be described.

[0082] Figure 4 It is a plan view of the scan selection switch 41 and the feedback switch 46 arranged on the LSI chip, and also shows a plan view of the non-selection switch 50 . As these switches, MOS transistors are used.

[0083] The channel width of the scan selection switch 41 is W1, and the channel length is L1. In contrast, the channel width of the feedback switch 46 is W2 and the channel length is L2. In addition, here, L=L1=L2, but L1 and L2 may be different lengths.

[0084] Both the scan selection switch 41 and the feedback switch 46 are in an on state during the scan selection period, and thus constitute a common gate electrode 47 . In addition, when these switches are in the on state, the non-selective switch 50 is in the off state, so the gate electrode 51 is configured separately, but as the switch 50, it i...

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Abstract

A display device, comprising: a scan selection switch (2) provided corresponding to a plurality of scan wirings; a non-selection switch (9) for making the scan wirings in a non-selected state; a feedback switch (1) for detecting the potential of a scan electrode; and A negative feedback amplifier (7) that sets the scan electrode potential to a predetermined potential Vs for each scan electrode based on the scan electrode potential detected by the feedback switch (1), and a synthesis obtained by combining the capacitance of the feedback switch (1) and its wiring capacitance The time constant formed by the capacitor 3 and the resistance Ron2 of the feedback switch (1) is set to be smaller than the combined capacitance obtained by synthesizing the capacitance of the scan selection switch (2) and the capacitance (Cp) of the display panel and the combined capacitance of the scan selection switch (2). The time constant of the resistor (Ron1) composition.

Description

[0001] This application claims priority from Japanese Patent Application Serial No. 2005-164411 filed on June 3, 2005, the contents of which are incorporated herein by reference. technical field [0002] The present invention relates to a display device and its driving method, and more particularly to a display device using a multi-electron source in which electron emitting elements are arranged in a matrix and its driving method. Background technique [0003] In recent years, electron sources have been installed at the intersections of electrode groups parallel to each other, and the applied voltage or application time to each electron source has been adjusted to control the amount of emitted electrons from the electron source, and the emitted electrons have been accelerated by high voltage to irradiate the fluorescent light. The matrix method display of the self-luminous type of the body gets a lot of looks. [0004] As electron sources used in such displays, there are ele...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/20
Inventor 新田博幸原正久尾崎俊文原正久
Owner JAPAN DISPLAY INC