Display apparatus and drive control method

Abstract

A display apparatus includes a display panel having a plurality of display pixels two-dimensionally arrayed display pixels having pixel drive circuits and light emitting devices near at intersections of a plurality of scan lines and a plurality of data lines laid out in a row direction and in a column direction so as to be orthogonal to each other, a scan driver which applies a scan signal to the scan lines at a predetermined timing, a data driver which supplies a gradation signal corresponding to display data to the display pixels via the data lines, and a pair of power source drivers which apply a supply voltage to both ends of a plurality of power supply lines laid out in the column direction at a predetermined timing.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

These objects and other objects and advantages of the present invention will become more apparent upon reading of the following detailed description and the accompanying drawings in which:

FIG. 1 is a schematic block diagram showing a display apparatus according to one embodiment of the present invention;

FIG. 2 is a schematic configuration diagram showing one example of a display panel to be used in the display apparatus according to the embodiment;

FIG. 3 is a schematic configuration diagram showing one example of peripheral circuits (scan driver, power source driver) of the display panel to be used in the display apparatus according to the embodiment;

FIG. 4 is a schematic configuration diagram showing one example of a data driver to be used in the display apparatus according to the embodiment;

FIG. 5 is a schematic plan view showing one example of the array of pixels of the display panel to be used in the display apparatus according to the embodiment;

FIG. 6 is an equivalent circuit diagram showing one example of the circuit configuration of display pixels adaptable to the display panel according to the embodiment;

FIG. 7 is a timing chart illustrating a drive control method for display pixels (pixel drive circuits) to be used in the embodiment;

FIG. 8A is a conceptual diagram illustrating a data writing operation in the display pixels (pixel drive circuits) to be used in the embodiment;

FIG. 8B is a conceptual diagram showing a non-emission operation not in the data writing operation in the display pixels (pixel drive circuits) to be used in the embodiment;

FIG. 9 is a conceptual diagram illustrating the light emission operation of the display pixels (pixel drive circuits) to be used in the embodiment;

FIG. 10 is a plan layout view showing one example of the display pixels adaptable to the display apparatus (display panel) according to the embodiment;

FIG. 11 is a schematic cross-sectional view showing the X1-X1 cross section of display pixels EM having the plan layout shown in FIG. 10;

FIG. 12 is a schematic cross-sectional view showing the X2-X2 cross section of the display pixels EM having the plan layout shown in FIG. 10;

FIG. 13 is a waveform timing chart exemplarily illustrating one example of the drive control method for the display apparatus according to the embodiment;

FIG. 14 is a timing chart exemplarily illustrating another example of the drive control method for the display apparatus according to the embodiment;

FIG. 15 is a schematic plan view showing another example of the array of pixels of the display panel to be used in the display apparatus according to the embodiment;

FIG. 16 is a timing chart exemplarily illustrating a further example of the drive control method for the display apparatus according to the embodiment;

FIG. 17 shows experimental results showing the levels of voltage drops of the supply voltage in the display panel to be applied to the display apparatus according to the embodiment;

FIG. 18 is a timing chart exemplarily illustrating a still further example of the drive control method for the display apparatus according to the embodiment;

FIG. 19 is a diagram showing the essential portion of the schematic configuration of the conventional active matrix type light emission display (organic EL display); and

FIG. 20 is a diagram showing the circuit configuration of a display cell to be used in the conventional active matrix type light emission display (organic EL display).

Claims

1. A display apparatus having a display panel comprising: a substrate whose distance between both peripheral edge portions in a column direction is shorter than a distance between both peripheral edge portions in a row direction;a plurality of display pixels provided on the substrate in the row direction and the column direction;a plurality of power source lines laid out on the substrate in the row direction and connected to the plurality of display pixels; anda plurality of power supply lines laid out to the peripheral edge portion of the substrate in the column direction and connected to the power source lines at individual nodes.

2. The display apparatus according to claim 1, wherein each of the plurality of power supply lines is connected to of the power source lines of an associated one of blocks into which the plurality of display pixels are grouped by a predetermined number of rows.

3. The display apparatus according to claim 2, wherein the nodes are provided one for each of the groups of display pixels laid out in the row direction by a number of the blocks.

4. The display apparatus according to claim 1, wherein in the display panel, a longest distance in distances from the peripheral edge portions of the substrate in the column direction where one ends of the power supply lines are laid out to the nodes is shorter than a longest distance in distances from the peripheral edge portions of the substrate in the row direction to the nodes.

5. The display apparatus according to claim 1, wherein one ends and other ends of the power supply lines are led to both peripheral edge portions of the display panel, and a sum of a longest distance in shorter distances in those distances from the nodes to one ends of the power supply lines which are obtained node by node, and those distances from the nodes to other ends of the power supply lines which are obtained node by node, each of the shorter distances being a shorter one of the distance from the associated node to one end of the associated power supply line and the distance from the associated node to the other end of the associated power supply line, and a longest distance in distances from the display pixels located between two nodes adjoining in the row direction to a nearest node is set shorter than a half the distance between both peripheral edge portions of the substrate in the row direction.

6. The display apparatus according to claim 1, further comprising: a power source drive section which applies a supply voltage from one end side of the power supply lines.

7. The display apparatus according to claim 6, further comprising: a scan drive section which sequentially applies a scan signal to the display pixels of each row of the display panel at a predetermined timing to set the display pixels in a selected state;a data drive section which generates a gradation signal corresponding to display data for displaying desired image information and sequentially supplies the gradation signal to the display pixels of the row set in the selected state; anda drive control section which operates each of the scan drive section, the data drive section, and the power source drive section at a predetermined timing by supplying a timing control signal thereto, thereby allowing the display pixels of each of the blocks of the display panel to perform a display operation with a gradation state corresponding to the display data at a time.

8. The display apparatus according to claim 7, wherein during a period where the data drive section sequentially supplies the gradation signal to the display pixels of each row of each of the blocks, in which the plurality of display pixels are grouped by a predetermined number of rows, the drive control section generates the timing control signal which causes the power source drive section to apply the supply voltage for allowing the display pixels of each row of the each of the blocks to perform a non-display operation.

9. The display apparatus according to claim 1, further comprising: a pair of power source drive sections which simultaneously apply a supply voltage from both end sides of the power supply lines.

10. The display apparatus according to claim 9, further comprising: a scan drive section which sequentially applies a scan signal to the display pixels of each row of the display panel at a predetermined timing to set the display pixels in a selected state;a data drive section which generates a gradation signal corresponding to display data for displaying desired image information and sequentially supplies the gradation signal to the display pixels of the row set in the selected state; anda drive control section which operates each of the scan drive section, the data drive section, and the pair of power source drive sections at a predetermined timing by supplying a timing control signal thereto, thereby allowing the display pixels of each of the blocks of the display panel to perform a display operation with a gradation state corresponding to the display data at a time.

11. The display apparatus according to claim 10, wherein during a period where the data drive section sequentially supplies the gradation signal to the display pixels of each row of each of the blocks, in which the plurality of display pixels are grouped by a predetermined number of rows, the drive control section generates the timing control signal which causes the pair of power source drive sections to apply the supply voltage for allowing the display pixels of each row of the each of the blocks to perform a non-display operation.

12. The display apparatus according to claim 1, wherein the display pixels include light emitting devices.

13. The display apparatus according to claim 1, wherein the display pixels include transistors.

14. The display apparatus according to claim 1, wherein the display pixels include transistors connected to the power source lines.

15. The display apparatus according to claim 1, further comprising: data lines connected to the display pixels in the column direction; andscan lines connected to the display pixels in the row direction.

16. A drive control method for a display apparatus having a display panel having a plurality of display pixels laid out in a row direction and in a column direction, wherein the display pixels of each row are set in a selected state at a predetermined timing to supply a gradation signal corresponding to display data for displaying desired image information, thereby allowing the display pixels to perform a display operation with a gradation state corresponding to the display data and display the desired image information on the display panel, the method comprising the steps of: applying a first supply voltage to the display pixels of each of blocks into which the plurality of display pixels laid out on the display panel are grouped by a predetermined number of rows, via a plurality of power supply lines laid out in the column direction and a plurality of power source lines laid out in the row direction, thereby allowing the display pixels of the each block to simultaneously perform a non-display operation;sequentially supplying and writing the gradation signal to the display pixels of each row of the each block in the non-display operation; andapplying a second supply voltage to the display pixels of the each block via the plurality of power supply lines and the plurality of power source lines, thereby allowing the display pixels of the each block to simultaneously perform a display operation in the gradation state corresponding to the display data.

17. The drive control method according to claim 16, wherein each of the display pixels includes a light emitting device, the step of allowing the display pixels of the block to simultaneously perform the non-display operation causes the light emitting device of the each display pixel to perform a non-emission operation, andthe step of allowing the display pixels to perform the display operation in the gradation state corresponding to the display data causes the light emitting device of the each display pixel to perform an emission operation with a luminance gradation corresponding to the display data.