JP2006084566A - Manufacturing method for display device, manufacturing equipment of display device and flat display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method for a display and manufacturing equipment of the display, capable of manufacturing the display which is stable in quality with little individual variability regarding display luminance characteristics and a flat display. <P>SOLUTION: A power control section 6, which includes a power control register 6a for holding a panel individual data set by an individual data setting processor 20, determines the value of the drive voltage for scanning (VDy) which is supplied to a scanning voltage driver (Y driver) 3, based on a value of the panel individual data held in the power control register 6a. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for manufacturing a display device including a display panel in which a plurality of display pixels formed by a plurality of phosphor layers and a plurality of electron-emitting devices corresponding to the plurality of phosphor layers are arranged in a matrix, The present invention relates to a display device manufacturing apparatus and a flat display device.

  In recent years, a liquid crystal display (LCD), a plasma display (PDP), a field emission display (FED), and the like are known as an image display device having a flat flat panel structure. In addition, as one type of FED, development of a surface-conduction electron-emitter display (SED) including a surface conduction electron-emitting device is in progress.

  The SED has a front substrate and a rear substrate that are opposed to each other with a predetermined gap. These substrates are joined to each other at peripheral edges via rectangular frame-shaped side walls, and the inside is evacuated to form a flat envelope having a flat panel structure. A phosphor screen having phosphor layers of three colors (R, G, B) is provided on the inner surface of the front substrate, and an inner surface of the rear substrate is provided for each pixel as an electron emission source for exciting and emitting the phosphor layer. A number of electron-emitting devices corresponding to are arranged. A large number of wires for driving the electron-emitting devices are provided in a matrix on the inner surface of the rear substrate, and the end portions are drawn out of the vacuum envelope.

When this SED is operated, a high voltage (anode voltage) of about 10 [kV] is applied between the substrates, and a drive voltage is selectively applied to each electron-emitting device via a drive circuit connected to the wiring. Electron beams are selectively emitted from each electron-emitting device, and these electron beams are applied to the corresponding phosphor layers, and the phosphor layers are excited and emitted to display a color image. The respective electron-emitting devices arranged in a matrix on the display panel of the SED are displayed and driven by a driving circuit. The drive circuit includes a scanning line driver (Y driver) connected to one end of the plurality of scanning lines and a signal line driver (X driver) connected to one end of the plurality of signal lines. The Y driver sequentially drives a plurality of scanning lines using the scanning signal, and the X driver drives the plurality of signal lines using a driving signal that is pulse-modulated according to the video signal while each scanning line is driven. . Each display pixel emits light with a luminance corresponding to a scanning signal on the scanning line and a driving signal pulse-width modulated in accordance with the video signal on the signal line.
JP 2002-221933 A

  In a display device in which electron emission elements such as the SED are arranged in a matrix, electrons generated on the cathode side are projected on the phosphor side on the anode side to emit light from the phosphor screen. This is a device structure to be produced, and the brightness of the corresponding pixel changes due to variations in the amount (current) of electrons generated by the electron-emitting device serving as the electron source on the cathode side.

  The variation in device characteristics of the electron-emitting devices arranged in a matrix on the display panel is caused by the heat treatment including the baking process and the substrate bonding process of the substrate (front substrate on the anode side and rear substrate on the cathode side) in the above-described manufacturing process. In the process, the heating / cooling temperature of the heating / cooling chamber, the temperature distribution thereof, the heating / cooling rate, etc. are greatly affected by various conditions and the environment on the production line. For this reason, display panels that have undergone the above manufacturing process have individual differences in display luminance characteristics. Conventionally, no particular measures have been taken with respect to variations in display luminance characteristics due to variations in element characteristics for each display panel.

  An object of the present invention is to provide a display device manufacturing method, a display device manufacturing apparatus, and a flat display device capable of shipping a display device having a stable quality with little individual difference with respect to display luminance characteristics.

According to the present invention, a display panel in which a plurality of display pixels formed by a plurality of phosphor layers and a plurality of electron-emitting devices corresponding to the plurality of phosphor layers are arranged in a matrix, and the display panel is arranged. In a method for manufacturing a display device comprising driving means for driving a plurality of display pixels by driving voltages of scanning lines and signal lines, the driving voltage output from the driving means to the scanning lines is applied to the display device. A setting means that can be set from the outside is provided, and the driving voltage to be output to the scanning line is set by the setting means so as to reduce individual differences in display luminance characteristics for each of the display devices. A method for manufacturing a display device is provided.
In the method for manufacturing the display device, the setting may be performed by measuring a luminance characteristic of the display panel for each display device and outputting a driving voltage to the scanning line of the corresponding display device based on the measured value. There is provided a method for manufacturing a display device performed by a processing means for setting.
In the display device manufacturing method, the processing means manufactures a display device that measures the luminance characteristics of the display panel when the drive voltage output to the signal line is zero potential or a predetermined low potential state. A method is provided.
In the display device manufacturing method, the processing means measures display luminance values of all pixels of the display panel, and based on the average value, the electron-emitting devices provided in the corresponding display device A display device manufacturing method for setting a driving voltage according to an average cut-off voltage is provided.
Further, in the method for manufacturing the display device, the processing means measures a display luminance value of a pixel in a partial region of the display panel, and based on the average value, the processing device is provided in the corresponding display device. A method for manufacturing a display device is provided in which a driving voltage is set according to an average cutoff voltage of an electron-emitting device.
In the display device manufacturing method, there is provided a display device manufacturing method, wherein the processing means includes setting operation means that allows an inspector to adjust or set the drive voltage by visual inspection.

Further, according to the present invention, a display panel in which a plurality of display pixels formed by a plurality of phosphor layers and a plurality of electron-emitting devices corresponding to the plurality of phosphor layers are arranged in a matrix, and the display panel In a display device manufacturing apparatus including a driving unit that drives a plurality of arranged display pixels by driving voltages of scanning lines and signal lines, individual differences in display luminance characteristics of a display panel provided in the display device are calculated. An apparatus for manufacturing a display device is provided that includes setting means for setting the driving voltage of the scanning line output from the driving means for each display device so as to decrease the driving voltage.
Further, in the display device manufacturing apparatus, the setting unit measures a luminance characteristic of the display panel for each display device, and outputs to the scanning line of the corresponding display device based on the measured value. A display device manufacturing apparatus including processing means for setting a voltage is provided.
Further, in the display device manufacturing apparatus, the processing means includes means for measuring the luminance characteristics of the display panel when the driving voltage output to the signal line is zero potential or a predetermined low potential state. An apparatus for manufacturing a display device is provided.
Further, in the display device manufacturing apparatus, the processing means measures display luminance values of all pixels of the display panel, and based on the average value, the electron-emitting device provided in the corresponding display device There is provided an apparatus for manufacturing a display device comprising means for setting a driving voltage according to the average cut-off voltage.
Further, in the display device manufacturing apparatus, the processing means measures a display luminance value of a pixel in a partial region of the display panel, and based on the average value, the processing device is provided in the corresponding display device. An apparatus for manufacturing a display device is provided, which includes means for setting a driving voltage according to an average cutoff voltage of the electron-emitting device.

Further, according to the present invention, a display panel in which a plurality of display pixels formed by a plurality of phosphor layers and a plurality of electron-emitting devices corresponding to the plurality of phosphor layers are arranged in a matrix, and the display panel Drive means for driving a plurality of arranged display pixels with drive voltages of scanning lines and signal lines, and setting information according to the luminance characteristics of the display panel, and the driving means based on the setting information There is provided a flat panel display device provided with panel management means for controlling the drive voltage output to.
Further, in the flat display device, the panel management means determines the display brightness of the display panel in advance when the drive signal output to the signal line is in a predetermined gradation display state based on the setting information. A flat display device is provided in which a driving voltage output to the scanning line is controlled so that a predetermined luminance value is obtained, and the driving unit scans the scanning line line-sequentially based on the driving voltage.
Further, in the flat panel display device, the panel management means, based on the setting information, allows the scanning line so that the display brightness of the display panel becomes a constant black level when the signal line is at a zero potential. There is provided a flat display device for controlling the drive voltage to be output.
Further, in the flat display device, the panel management means sets the panel solid information unique to the display panel according to the display brightness of the display panel when the display panel is driven by the drive signal having a predetermined potential. There is provided a flat display device that has a holding unit that holds and controls a driving voltage that the driving unit outputs to the scanning line based on setting information held in the holding unit.
Further, in the flat display device, the setting information is based on display luminance values of all pixels of the display panel measured by an external device when the display panel is driven with the predetermined drive signal. There is provided a flat display device which is individual information of the display panel according to the generated average cut-off voltage of the electron-emitting device.
In the flat display device, the setting information is measured by an external device, and the display brightness of pixels in a partial display region of the display panel when the display panel is driven with the drive signal having a predetermined potential. There is provided a flat display device which is individual information of the display panel according to an average cutoff voltage of the electron-emitting device generated based on the value.

  It is possible to ship a display device having a stable quality with little individual difference regarding display luminance characteristics.

  Embodiments of the present invention will be described below with reference to the drawings. Here, an SED including an electron-emitting device having an XGA resolution in which the number of color display pixels is horizontal: vertical = 1280: 720 is taken as an example.

  FIG. 1 schematically shows a circuit configuration of a flat display device according to an embodiment of the present invention. The flat display device includes a display panel 1, an image voltage driver (X driver) 2, a scanning voltage driver (Y driver) 3, an input signal processing circuit 5, a power control unit 6, and the like.

  The display panel 1 is arranged in m (= 720) scanning lines Y (Y1 to Ym) arranged in the horizontal (horizontal) direction, and arranged in the vertical (vertical) direction crossing these scanning lines Y1 to Ym. n (= 1280 × 3) signal lines X (X1 to Xn) and m × n (= about) that are arranged in the vicinity of the intersections of the scanning lines Y1 to Ym and the signal lines X1 to Xn to form a display screen. 2.76 million) display pixels PX are provided on the support substrate.

  Each color display pixel is constituted by three display pixels PX adjacent in the horizontal direction. In this color display pixel, three display pixels PX each have an electron emission element 11 serving as an electron emission source and red (R), green (G), and blue light emitted by an electron beam emitted from these electron emission elements 11. It is comprised by the fluorescent substance 12 of (B). That is, each display pixel of the phosphor screen has a one-to-one correspondence with the electron emission source. Each scanning line Y is used as a scanning electrode connected to the electron-emitting device 11 of the display pixel PX in the corresponding row, and each signal line X is used as a signal electrode connected to the electron-emitting device 11 of the display pixel PX in the corresponding column. It is done.

  The X driver 2, the Y driver 3, the input signal processing circuit 5, and the power supply control unit 6 are each used as a display driving circuit for the display panel 1 and are arranged around the display panel 1. The X driver 2 is connected to the signal lines X1 to Xn, and the Y driver 3 is connected to the scanning lines Y1 to Ym.

  The input signal processing circuit 5 has a line memory for temporarily storing video signals for one horizontal line, and performs input processing of RGB video signals and synchronization signals supplied from an external signal source. The input signal processing circuit 5 supplies the video signal temporarily stored in the line memory to the X driver 2, and supplies operation timing signals according to the synchronization signals (vertical synchronization signal and horizontal synchronization signal) to the X driver 2 and the Y driver 3.

  The power supply control unit 6 generates and supplies power for operation of the entire display device including the display panel 1 based on an external power supply, and has a program control function by a microprocessor. The power supply control unit 6 supplies a drive voltage (VDx, VDy) to the X driver 2 and the Y driver 3 in addition to the above-described anode voltage as a drive power supply for the display panel 1. A driving voltage (VDx) for driving the signal lines X1 to Xn is supplied to the X driver 2, and a scanning driving voltage (VDy) for driving the scanning lines Y1 to Ym is supplied to the Y driver 3. Supply.

  The Y driver 3 sequentially drives the scanning lines Y1 to Ym based on the scanning drive voltage (VDy) supplied from the power supply control unit 6 and the operation timing signal input from the input signal processing circuit 5, and X Based on the signal drive voltage (VDx) supplied from the power controller 6 and the video signal and operation timing signal for one horizontal line input from the input signal processing circuit 5, the driver 2 scans the Y1 line. While Ym is driven by the Y driver 3, the signal lines X1 to Xn are driven corresponding to the video signal for one horizontal line output from the input signal processing circuit 5. The X driver 2 has a configuration in which a signal whose potential changes according to the video signal is output as a drive voltage (VDx), and a configuration in which a drive voltage (VDx) having a pulse width according to the gradation of the video signal is output. The present invention is applicable to any configuration.

  Further, the power supply control unit 6 has a power supply control register (REG) 6a for holding panel individual data set by the individual data setting processing device 20 described later, and the value of the panel individual data held in the power supply control register 6a. The scanning drive voltage (VDy) to be supplied to the Y driver 3 is determined based on the (set value), and the scanning drive voltage (VDy) according to the setting is output to the Y driver 3. The setting of the scanning drive voltage (VDy) and the panel individual data will be described later. The power controller 6 includes an adjusting means (setting operation means) that allows the inspector to arbitrarily adjust (correct) the value (setting value) set in the power control register (REG) 6a by visual sensitivity measurement. It is also possible to provide it. In this case, it is also possible for the inspector to directly set the value of the scanning drive voltage (VDy) by visual inspection using the adjusting means.

  The individual data setting processing device 20 is used only for adjusting individual differences in display luminance characteristics of the display panel 1, and measures the display luminance of the display panel 1 under a predetermined drive signal state by a processing procedure as shown in FIG. The panel individual data indicating the display luminance characteristics of the display panel 1 is set in the power control register 6 a of the power control unit 6.

  The individual data setting processing device 20 drives the display panel 1 with a predetermined drive signal (for example, a low-brightness setting wiring voltage) when adjusting individual differences in display luminance characteristics of the display panel 1 and at the time of the driving. For example, display luminance values of all the pixels of the display panel 1 are measured and collected (step S11). Then, an average value of the display luminance values of all the collected pixels is calculated (step S12). This value is temporarily retained as panel individual data (step S13), and the retained panel individual data is set in the power control register 6a provided in the power control unit 6 (step S14).

The panel individual data set in the power supply control register 6a in this way corresponds to the value of the average cutoff voltage of the electron-emitting devices 11 provided in the display panel 1 as the value of the processing result.

  The power supply controller 6 adjusts the scanning drive voltage (VDy) supplied to the Y driver 3 based on the individual panel data set in the power supply control register 6a. FIG. 2 shows an adjustment example of the individual difference in display brightness of the display panel 1 and the drive voltage (VDy) for reducing the individual difference. Here, an electron-emitting device having a low cut-off voltage with respect to the expected cut-off voltage of the electron-emitting device 11 due to variations in device characteristics of the electron-emitting device 11 that can occur in the manufacturing process of the display panel 1 as described above. A display panel 11 (hereinafter referred to as a panel having a low cut-off voltage) A, and a display panel C (hereinafter referred to as a panel having a high cut-off voltage) C in which electron-emitting devices 11 having a high cut-off voltage are arranged; Each V-I characteristic is shown with a display panel (hereinafter referred to as a standard panel) B in which the electron-emitting devices 11 having an expected cutoff voltage are arranged.

  Here, by approximating the panel A with a low cut-off voltage and the panel C with a high cut-off voltage to the brightness characteristics of the standard panel B, the product has a stable quality with reduced individual differences in display brightness characteristics. A display device can be provided.

  Therefore, in the embodiment of the present invention, the scanning drive voltage (VDy) supplied from the power supply control unit 6 to the Y driver 3 is not fixed to a constant voltage value, and is appropriate for panel driving for each display device. Thus, the luminance characteristics of the panels A and B are set closer to the luminance characteristics of the panel B by setting a different driving voltage (VDy). As described above, the individual data setting processing device 20 drives the display panel 1 to measure the display luminance characteristic of the panel, and the panel individual data according to the value of the measurement result is set in the power control unit 6 as described above. This is realized by setting the power control register 6a. By the individual setting for each panel, the panel A having a low cut-off voltage is lower than the cut-off voltage of the standard panel B (average value of cut-off voltages of the electron-emitting devices 11 of the panel B) Vb. Drive voltage (VDy) having a potential corresponding to the cut-off voltage (average value of cut-off voltages of the electron-emitting devices 11 of panel A) Va is supplied to the Y driver 3, and the scanning lines Y1 to Y1 are driven by the drive voltage (VDy). Ym is driven. As a result, the luminance characteristic of the panel A becomes closer to the luminance characteristic of the panel B. For example, when the output of the X driver 2 is zero potential (zero gradation), the panel A having a low cutoff voltage is almost the same as the standard panel B. Driving with luminance characteristics, each panel is in a display luminance state of a constant black level. Even when the output of the X driver 2 is not zero potential, each panel is in a display luminance state at a certain level. For panel C having a high cut-off voltage, this corresponds to a cut-off voltage of panel A (average value of cut-off voltages of electron-emitting devices 11 of panel C) Vc, which is higher than cut-off voltage Vb of standard panel B. The potential drive voltage (VDy) is supplied to the Y driver 3, and the scanning lines Y1 to Ym are driven by the drive voltage (VDy). As a result, the luminance characteristic of the panel C approaches the luminance characteristic of the panel B. For example, when the output of the X driver 2 is zero potential, the panel C having a low cut-off voltage is driven with the same luminance characteristic as the standard panel B. Each of the panels is in a display luminance state at a constant black level. Therefore, with respect to the display panels A and C in which the display luminance characteristics vary, the variations can be converged to the display luminance characteristics of the standard panel, and thereby a stable quality display device with little individual difference regarding the display luminance characteristics. The product can be shipped.

  In the embodiment described above, the display luminance value of all the pixels of the display panel 1 is measured, and the driving voltage according to the average cutoff voltage of the electron-emitting device 11 provided in the corresponding display device based on the average value. Is set, but the display luminance value of a pixel in a predetermined specific area is measured, and based on the average value, the driving voltage according to the average cutoff voltage of the electron-emitting device 11 provided in the corresponding display device Or a configuration in which the driving voltage of the Y driver 3 is set based on a value corrected by the inspector based on any one of the above average values based on visual sensitivity. The drive voltage may be set according to visual sensitivity.

  In the above-described embodiment, the display brightness is improved for the SED. However, the present invention can be applied not only to the SED but also to an image display device such as an FED. The present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. For example, in the above-described embodiment, the display luminance characteristic of each display panel 1 is measured, and panel individual data according to the value of the measurement result is set in the power control register 6 a of the power control unit 6. However, for example, the same scanning drive voltage (VDy) may be set for each display panel manufactured under the same conditions without performing measurement for each panel. Further, the setting at this time may be realized not by the setting of the external individual data setting processing device 20 but by, for example, the external interface of the power control unit 6 having a program control function and software control.

1 is a schematic explanatory diagram of a flat display device according to an embodiment of the present invention. The figure which shows the luminance characteristic of the display panel in the said embodiment. The flowchart which shows the process sequence of the individual data setting processing apparatus in the said embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Display panel, 2 ... X driver, 3 ... Y driver, 5 ... Input signal processing circuit, 6 ... Power supply control part, 6a ... Power supply control register, 11 ... Surface conduction electron-emitting device, 12 ... Phosphor, 12A ... Phosphor screen, 20 ... individual data setting processor, 10A ... front substrate, 10B ... back substrate, X ... signal line, Y ... scan line, PX ... display pixel.

Claims (17)

A display panel in which a plurality of display pixels formed by a plurality of phosphor layers and a plurality of electron-emitting devices corresponding to the plurality of phosphor layers are arranged in a matrix, and a plurality of display pixels arranged in the display panel In a method for manufacturing a display device comprising a driving means for driving a scanning line and a signal line by a driving voltage,
The display device is provided with setting means capable of externally setting a driving voltage output from the driving means to the scanning line,
A method for manufacturing a display device, characterized in that, for each of the display devices, a drive voltage to be output to the scanning line is set by the setting means so as to reduce individual differences in display luminance characteristics.   The setting is performed by processing means for measuring a luminance characteristic of the display panel for each display device and setting a drive voltage to be output to the scanning line of the corresponding display device based on the measured value. The manufacturing method of the display apparatus of description.   3. The method of manufacturing a display device according to claim 2, wherein the processing means measures the luminance characteristics of the display panel when the driving voltage output to the signal line is zero potential or a predetermined low potential state.   The processing means measures display luminance values of all pixels of the display panel, and sets a driving voltage according to an average cutoff voltage of the electron-emitting devices provided in the corresponding display device based on the average value. The manufacturing method of the display apparatus of Claim 3.   The processing means measures a display luminance value of a pixel in a partial region of the display panel, and based on the average value, a driving voltage according to an average cutoff voltage of the electron-emitting device provided in the corresponding display device The manufacturing method of the display apparatus of Claim 3 which sets.   The method for manufacturing a display device according to claim 2, wherein the processing unit includes a setting operation unit that allows an inspector to adjust or set the driving voltage by visual inspection. A display panel in which a plurality of display pixels formed by a plurality of phosphor layers and a plurality of electron-emitting devices corresponding to the plurality of phosphor layers are arranged in a matrix, and a plurality of display pixels arranged in the display panel In a manufacturing apparatus of a display device comprising a driving means for driving the scanning line and the driving voltage of the signal line,
A setting means for setting the driving voltage of the scanning line output by the driving means is provided for each display device so as to reduce individual differences in display luminance characteristics of display panels provided in the display device. A display device manufacturing apparatus.   The setting means includes processing means for measuring a luminance characteristic of the display panel for each display device and setting a drive voltage to be output to the scanning line of the corresponding display device based on the measured value. 8. A display device manufacturing apparatus according to item 7.   9. The apparatus for manufacturing a display device according to claim 8, wherein the processing means includes means for measuring luminance characteristics of the display panel when a driving voltage output to the signal line is zero potential or a predetermined low potential state.   The processing means measures display luminance values of all pixels of the display panel, and sets a driving voltage according to an average cutoff voltage of the electron-emitting devices provided in the corresponding display device based on the average value. 10. The display device manufacturing apparatus according to claim 9, further comprising means.   The processing means measures a display luminance value of a pixel in a partial region of the display panel, and based on the average value, a driving voltage according to an average cutoff voltage of the electron-emitting device provided in the corresponding display device The display device manufacturing apparatus according to claim 9, further comprising: A display panel in which a plurality of display pixels formed by a plurality of phosphor layers and a plurality of electron-emitting devices corresponding to the plurality of phosphor layers are arranged in a matrix;
Driving means for driving a plurality of display pixels arranged on the display panel by driving voltages of scanning lines and signal lines;
A flat panel display device comprising: panel management means which has setting information according to the luminance characteristics of the display panel and which controls the driving voltage output from the driving means to the scanning lines based on the setting information. .   The panel management means, based on the setting information, allows the display brightness of the display panel to be a predetermined brightness value when a drive signal output to the signal line is in a predetermined gradation display state. 13. The flat display device according to claim 12, wherein a driving voltage output to the scanning line is controlled, and the driving unit scans the scanning line line-sequentially based on the driving voltage. The panel management means controls, based on the setting information, a drive voltage output to the scanning line so that a display luminance of the display panel becomes a constant black level when the signal line is at a zero potential. Item 14. A flat display device according to Item 13.   The panel management means has holding means for holding panel solid information unique to the display panel according to the display brightness of the display panel when the display panel is driven with the drive signal having a predetermined potential as the setting information. The flat display device according to claim 12, wherein the driving voltage that the driving unit outputs to the scanning line is controlled based on setting information held in the holding unit.   The setting information is an average cut of the electron-emitting devices generated based on display luminance values of all pixels of the display panel when the display panel is driven by a predetermined drive signal, measured by an external device. The flat display device according to any one of claims 12 to 15, which is individual information of the display panel according to an off voltage.   The setting information is generated based on display luminance values of pixels in a partial display area of the display panel when the display panel is driven by the drive signal having a predetermined potential, measured by an external device. The flat display device according to any one of claims 12 to 15, which is individual information of the display panel according to an average cutoff voltage of the emitting element.

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