JP4520750B2 - Discharge type display panel drive device - Google Patents

Description

  The present application belongs to the technical field of a discharge type display panel configured by a plurality of pixels having a plurality of cells emitting light of different colors.

  Conventionally, as an example of this type of discharge display panel, a plasma display panel configured by a plurality of pixels having a plurality of cells that emit light of different colors is known (for example, see Patent Document 1).

Such a conventional plasma display panel is driven by a display control device (corresponding to “driving device” in the present application) that emits light by applying a pulse to a cell in which wall charges are accumulated. ing.
Japanese Unexamined Patent Publication No. 2003-29698 (page 3, FIG. 1)

  However, the above-described conventional plasma display panel has a situation in which an afterimage is generated by continuously emitting light from a cell in which wall charges are not completely erased.

  Therefore, the present application has been made in view of the above-described circumstances. As an example of the problem, a drive device for a discharge type display panel that can effectively remove an afterimage generated in the discharge type display panel is provided. For the purpose.

In order to solve the above-described problem, a driving device for a discharge type display panel according to claim 1 is a driving device for a discharge type display panel configured by a plurality of pixels each composed of three cells emitting light of different colors. Each of the three cells constituting one pixel is a lighted cell or a lighted cell, and includes a lighted cell and a lighted cell in each pixel. When a combination of cells set as described above is used as a light emission mode, drive data indicating a drive pattern for periodically switching a plurality of light emission modes in which the combination of cells set to be turned on and turned off in the pixel is held Holding means, and the discharge type display based on an image signal generated from an externally input signal or the held drive data Comprising drive means for driving the panel, and in the drive pattern, the configuration number of each of the three cells which constitute one of the pixels in a state of being lit one period is equal to or the same have.

According to a sixth aspect of the present invention, there is provided a driving device for a discharge type display panel that includes three electrodes, a dielectric layer that covers the electrodes, and a protective layer that protects the dielectric layers. In the driving device of the discharge type display panel constituted by a plurality of pixels each comprising a plurality of cells, each of the three cells constituting one of the pixels is turned on or off. When a combination of cells set to include a lighted cell and a lighted cell in the pixel is set as a light emission mode, a combination of the cell set to the lighted state and the lighted off state in the pixel Generated from a signal inputted from the outside and holding means for holding drive data indicating a drive pattern for periodically switching a plurality of light emission modes having different Comprising a drive means for driving the discharge display panel based on the driving data image signal or the holding, the, in the driving pattern, in each one period of the three cells which constitute one of the pixels It has a configuration characterized in that the number of times of lighting is the same .

  Hereinafter, the best mode for carrying out the present application will be described with reference to the drawings. The embodiment described below shows an embodiment in which the discharge display panel according to the present application is applied to, for example, a plasma display panel (hereinafter referred to as “PDP (Plasma Display Panel)”). .

  First, the configuration of the PDP and the driving device in the present embodiment will be described with reference to FIGS. FIG. 1 is a block diagram showing the configuration of the PDP and the driving device in the present embodiment, and FIG. 2 is a cross-sectional view of the PDP shown in FIG.

  As shown in FIG. 1, the PDP 110 according to the present embodiment includes a plurality of pixels PE having a plurality of cells CL that emit light of different colors, and is driven by a driving device 120. The PDP 110 configured as described above includes an address driver 111 and sustain drivers 112 and 113.

  The address driver 111 has column electrodes D1 to Dm juxtaposed in the vertical direction with respect to the PDP 110, generates a data pulse corresponding to the display signal input from the driving device 120, and generates the generated data pulse. Is applied to the column electrodes D1 to Dm.

  The sustain driver 112 has row electrodes X1 to Xn juxtaposed in the horizontal direction with respect to the PDP 110, generates a sustain pulse corresponding to the drive signal input from the drive device 120, and generates the generated sustain pulse. Is applied to the row electrodes X1 to Xn.

  The sustain driver 113 has row electrodes Y1 to Yn juxtaposed in the horizontal direction with respect to the PDP 110, generates a sustain pulse corresponding to the drive signal input from the drive device 120, and generates the generated sustain pulse. Is applied to the row electrodes Y1 to Yn.

  As shown in FIG. 2, the PDP 110 configured as described above has a pair of row electrodes X1 to Xn and a pair of row electrodes Y1 to Yn formed on the inner surface of a front glass substrate 114 as a display surface. The row electrodes X1 to Xn and the row electrodes Y1 to Yn are covered with a dielectric layer 115. A protective layer 116 such as MgO (magnesium oxide) is deposited on the dielectric layer 115. A discharge space 118 is formed between the protective layer 116 and the rear glass substrate 117. On the rear glass substrate 117, column electrodes D1 to Dm coated with a phosphor are formed. In addition, the row electrodes X1 to Xn and the row electrodes Y1 to Yn form a plurality of horizontal lines in which one row electrode X and one row electrode Y are arranged in parallel. A plurality of cells CL are formed at a portion where the column electrode D intersects.

  As shown in FIG. 1, the drive device 120 in this embodiment includes an A / D (Analog / Digital) converter 121 and a differential / parallel converter 126, a display signal generator 122, a frame memory 123, and a PDP 110. A recording unit 124 as an example of a holding unit that holds driving data indicating a driving pattern for driving, and a control unit 125 as an example of a driving unit that drives the PDP 110 based on the driving data held in the recording unit 124. It has.

  Based on the control signal input from the control unit 125, the A / D converter 121 generates a digital image signal by digitizing an analog image signal input from the outside, for example, into 8 bits, and the generated The image signal is output to the display signal generator 122.

  Based on the control signal input from the control unit 125, the differential / parallel conversion unit 126 obtains a differential signal such as a DVI (Digital Video Interactive) format or an HDMI (High Definition Multimedia Interface) format from the outside. For example, a 28-bit digital image signal is generated by performing parallel conversion on the acquired differential signal, and the generated digital image signal is output to the display signal generation unit 122.

  The display signal generation unit 122 performs multi-gradation processing such as error diffusion processing and dither processing on the input image signal based on the control signal input from the control unit 125, for example, to 4 bits. A display signal is generated by compression, and the generated display signal is output to the frame memory 123.

  The frame memory 123 temporarily stores the display signal input from the display signal generation unit 122 based on the control signal input from the control unit 125, and addresses the stored display signal for each horizontal line of the PDP 110. The data is output to the driver 111.

  In the recording unit 124, drive data indicating a drive pattern for driving the PDP 110 is recorded in advance. The drive pattern will be described later.

  The control unit 125 reads the drive data recorded in the recording unit 124, generates an image signal based on the read drive data, and sends the generated image signal for afterimage removal to the display signal generation unit 122. It is designed to output.

  The display signal generation unit 122 generates a display signal corresponding to the afterimage removal image signal input from the control unit 125 based on the control signal input from the control unit 125, and generates the generated afterimage removal signal. A display signal is output to the frame memory 123.

  The frame memory 123 temporarily stores a display signal for afterimage removal input from the display signal generation unit 122 based on the control signal input from the control unit 125, and stores the stored display signal in the horizontal direction of the PDP 110. Each line is output to the address driver 111.

  The drive device 120 configured as described above drives the PDP 110 using a so-called subfield method that controls the number of discharges of each cell CL in order to realize gradation display of an image. The subfield method will be described later.

  Next, the drive pattern described above will be described with reference to FIGS. 3 is a plan view of the pixel of the PDP shown in FIG. 1, and FIG. 4 is a plan view of the pixel of the PDP shown in FIG.

  The drive pattern is for effectively removing an afterimage generated in the PDP 110. For example, in each pixel PE, a combination of a state in which at least one cell CL is turned on and a state in which at least one cell CL is turned off is combined. In addition, a plurality of light emission modes are periodically switched, and the same number of lighted states of one cell CL are generated in one cycle.

  Specifically, as shown in FIG. 3, the plurality of cells CL described above are indicated as first cells CL1 and Green (hereinafter referred to as “G”) that emit light to Red (hereinafter referred to as “R”). ) And a third cell CL3 emitting light to Blue (hereinafter referred to as “B”), and the second cell CL2 includes the first cell CL1 and the third cell CL3. Between the first cell CL3 and the second cell CL3. The plurality of pixels PE described above includes a first pixel PE1, a second pixel PE2, and a third pixel PE3, and the second cell CL2 and the second pixel PE2 of the first pixel PE1. The second cell CL2 and the second cell CL2 of the third pixel PE3 are adjacent to each other.

  In the PDP 110 configured as described above, the drive pattern described above is the first mode in which the second cell CL2 is turned off and the first cell CL1 and the third cell CL3 are turned on as shown in FIG. PE1 and PE3 are shown in FIG. 4A, and PE2 is shown in FIG. 4B. The second mode in which the second cell CL2 is turned on and the first cell CL1 and the third cell CL3 are turned off (PE1 and PE3). 4 (b) and PE2 (see FIG. 4 (a)) are switched periodically (for example, every 1/60 seconds). In addition, the driving pattern described above causes the first cell CL1 to be lit once in one cycle, the second cell CL2 to be lit once in one cycle, and the third cell CL3 to be The lighted state is generated once per cycle. Furthermore, the drive pattern mentioned above makes the 1st pixel PE1 and the 2nd pixel PE2 into a different light emission mode. Here, the black circle in the figure indicates that the cell is turned off.

  In this manner, the image displayed on the PDP 110 is an image for removing afterimages, and pseudo-white is shown. This afterimage removal image may be displayed on the entire PDP 110 or may be displayed on a part of the PDP 110. Further, it may be displayed so as to move on the PDP 110 in a predetermined direction.

  Next, the subfield method described above will be described with reference to FIGS. 5 is a diagram illustrating a driving principle of the PDP shown in FIG. 1, and FIG. 6 is a diagram illustrating a driving waveform of the PDP shown in FIG.

  In the subfield method, as shown in FIG. 5, the field FL as one display period of the cell CL is divided into n subfields SF1 to SFn, and the number of discharges of the cell CL is divided into the divided subfields SF1 to SFn. Is supposed to be assigned. In general, in an NTSC (National TV Standards Committee) image signal, one second consists of 30 frames and one frame consists of two fields, so one second corresponds to 60 fields.

  Each of the subfields SF1 to SFn includes a reset period for initializing the cell CL, an address period for selectively setting a lighting state for enabling the cell CL and a lighting state for disabling the cell CL, and lighting A sustain period for continuously lighting the cell CL set in the state is provided.

  First, in the reset period, as shown in the second stage from the top in FIG. 6, the reset pulse RPx is applied to the row electrodes X1 to Xn, and as shown in the third stage from the top in FIG. By applying the reset pulse RPy to the row electrodes Y1 to Yn, a reset discharge is generated and wall charges are accumulated in all the cells CL.

  Next, in the address period, as shown in the first stage from the top in FIG. 6, the data pulse DP is applied to the column electrodes D1 to Dm, and as shown in the third stage from the top in FIG. The scan pulse SP is applied to the row electrodes Y1 to Yn. At this time, when the cell is set in a lighting state, the data pulse DP is not applied to the cell CL, so that no erasing discharge is generated and the wall charges accumulated in the cell CL remain. On the other hand, when the cell CL is set to the extinguished state, the data pulse DP is applied to the cell CL to generate an erasing discharge, and the wall charges accumulated in the cell CL are erased.

  Next, in the sustain period, as shown in the second stage from the top in FIG. 6, the sustain pulse IPx is applied to the row electrodes X1 to Xn, and as shown in the third stage from the top in FIG. The sustain pulse IPy is applied to the row electrodes Y1 to Yn. At this time, in the cell CL set in the lighting state, a sustain discharge is generated, and the cell CL emits light. On the other hand, in the cell CL set to the extinguished state, the sustain discharge does not occur and the cell CL does not emit light.

  In this way, by repeating a series of driving steps including the reset period, the address period, and the sustain period for each of the subfields SF1 to SFn, gradation display corresponding to the number of sustain discharges is realized. ing.

  Then, at the end of the field FL, as shown in FIG. 5, an erasing period is provided. In the erasing period, an erasing discharge is generated by applying an erasing pulse and accumulated in the cell CL. The wall charge is erased. At this time, if the wall charges accumulated in the cell CL are not completely erased, the cell CL continuously emits light, and an afterimage is generated in the PDP 110.

  As described above, in this embodiment, the driving device 120 of the PDP 110 includes at least one cell CL in the driving device 120 of the PDP 110 configured by a plurality of pixels PE having a plurality of cells CL that emit light of different colors. A recording unit 124 that holds drive data indicating a drive pattern that periodically switches a plurality of light emission modes combining a lighted state and a state in which at least one cell CL is turned off, and a PDP 110 based on the held drive data. And a controller 125 to be driven.

  With this configuration, in the present embodiment, by driving the PDP 110 based on the drive data, a plurality of light emission modes that combine a state where at least one cell CL is lit and a state where at least one cell CL is turned off are periodically generated. Therefore, the wall charges accumulated in the cell can be completely erased, and the afterimage generated in the PDP 110 can be effectively removed. For example, in the PDP 110, the dielectric layer 115 of each cell CL is covered with a protective layer 116 such as MgO, and MgO of the lit cell CL is diffused into the extinguished cell CL, thereby efficiently dispersing MgO. Can do.

  In the present embodiment, the drive pattern has a configuration characterized in that the same number of states in which one cell CL is lit are generated in one cycle.

  With this configuration, in the present embodiment, the same number of states in which one cell CL is lit is generated in one cycle, so that afterimages generated in the PDP 110 can be effectively removed.

  In the present embodiment, the plurality of cells CL include the first cell CL1, the second cell CL2, and the third cell CL3, and the second cell CL2 includes the first cell CL1 and the third cell CL3. When arranged between the first pattern (refer to FIG. 4A) and the second pattern, the second cell CL2 is turned off and the first cell CL1 and the third cell CL3 are turned on. And a second mode in which the first cell CL1 and the third cell CL3 are turned off (see FIG. 4B) are periodically switched. is doing.

  With this configuration, in the present embodiment, the first mode (see FIG. 4A) and the second mode (see FIG. 4B) are periodically switched. It can be effectively removed.

  In the present embodiment, the plurality of pixels PE include the first pixel PE1 and the second pixel PE2, and the second cell CL2 of the first pixel PE1 and the second cell CL2 of the second pixel PE2 When adjacent to each other, the drive pattern has a configuration characterized in that the first pixel PE1 and the second pixel PE2 have different light emission modes.

  With this configuration, in the present embodiment, the first pixel PE1 and the second pixel PE2 have different light emission modes, so that afterimages generated in the PDP 110 can be effectively removed.

  In the present embodiment, as shown in FIG. 4, the driving pattern of the PDP 110 periodically changes between the first mode (see FIG. 4 (a)) and the second mode (see FIG. 4 (b)). Although not limited to this, as shown in FIG. 7, the first mode in which the second cell CL2 is turned off and the first cell CL1 and the third cell CL3 are turned on (FIG. )) And the second mode (see FIG. 7B) in which the first cell CL1 is turned off and the second cell CL2 and the third cell CL3 are turned on, and the third cell CL3 is turned off and the second cell CL3 is turned off. The third mode in which the first cell CL1 and the second cell CL2 are turned on (see FIG. 7C) may be switched periodically (for example, every 1/60 seconds).

  In the present embodiment, the driving pattern of the PDP 110 is such that the first pixel PE1 and the second pixel PE2 have different light emission modes, as shown in FIG. As shown, the first pixel PE1 and the second pixel PE2 may have the same light emission mode.

It is a block diagram which shows the structure of PDP and drive device in one Embodiment of this application. It is sectional drawing of PDP shown in FIG. It is a top view of the pixel of PDP shown in FIG. It is a top view of the pixel of PDP shown in FIG. It is a figure which shows the drive principle of PDP shown in FIG. It is a figure which shows the drive waveform of PDP shown in FIG. It is a top view of the pixel of PDP shown in FIG. It is a top view of the pixel of PDP shown in FIG.

Explanation of symbols

110 PDP
111 Address Driver 112 Sustain Driver 113 Sustain Driver 120 Drive Device 121 A / D Converter 122 Display Signal Generation Unit 123 Frame Memory 124 Recording Unit 125 Control Unit 126 Differential / Parallel Conversion Unit

Claims (6)

In a driving device for a discharge type display panel composed of a plurality of pixels each composed of three cells emitting light of different colors,
Each of the three cells constituting one pixel is a lighted cell or a lighted cell, and includes a lighted cell and a lighted cell in each pixel. When a set combination of cells is set as a light emission mode, holding that holds drive data indicating a drive pattern for periodically switching a plurality of light emission modes in which the combination of cells set to a lighted state and a light-off state in the pixel is different Means,
Driving means for driving the discharge display panel based on an image signal generated from a signal input from the outside or the held driving data;
Equipped with a,
In the driving pattern, the number of times each of the three cells constituting one pixel is turned on in one cycle is the same . In the drive device of the discharge type display panel according to claim 1,
Three cells constituting one pixel are defined as a first cell, a second cell, and a third cell, and the second cell is disposed between the first cell and the third cell. If
The driving pattern includes a first mode in which the second cell is turned off and the first cell and the third cell are turned on, and the second cell is turned on and the first cell and the second cell are turned on. A driving device for a discharge type display panel, characterized in that it periodically switches between the second mode in which the three cells are extinguished . In the drive device of the discharge type display panel according to claim 1 ,
Three cells constituting one pixel are defined as a first cell, a second cell, and a third cell, and the second cell is disposed between the first cell and the third cell. If
The driving pattern includes a first mode in which the second cell is turned off and the first cell and the third cell are turned on, and the second cell and the second cell are turned off and the first cell is turned off . characterized in that a third aspect the first cell and the second cell is lit are those for switching periodically with the second aspect of the third cell is lit third cell is turned off A discharge type display panel drive device. In the drive device of the discharge type display panel according to claim 2 or claim 3 ,
When the plurality of pixels include a first pixel and a second pixel, and the second cell of the first pixel and the second cell of the second pixel are adjacent to each other,
The driving device for a discharge type display panel , wherein the driving pattern is to make the first pixel and the second pixel have different light emission modes . In the drive device of the discharge type display panel according to claim 2 or claim 3 ,
When the plurality of pixels include a first pixel and a second pixel, and the second cell of the first pixel and the second cell of the second pixel are adjacent to each other,
The driving device for a discharge type display panel, wherein the driving pattern is to make the first pixel and the second pixel have the same light emission mode. A discharge-type display panel comprising a plurality of pixels, each of which is formed of a plurality of electrodes, a dielectric layer that covers the electrodes, and a protective layer that protects the dielectric layers, each of which has three cells that emit light of different colors . In the drive device,
Each of the three cells constituting one pixel is a lighted cell or a lighted cell, and includes a lighted cell and a lighted cell in each pixel. When a set combination of cells is set as a light emission mode, holding that holds drive data indicating a drive pattern for periodically switching a plurality of light emission modes in which the combination of cells set to a lighted state and a light-off state in the pixel is different Means,
Driving means for driving the discharge display panel based on an image signal generated from a signal input from the outside or the held driving data;
With
In the driving pattern, the number of times each of the three cells constituting one pixel is turned on in one cycle is the same .

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