JPS63261297A - Display device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Summary] The present invention provides a display device, particularly a display device whose display section generates heat due to screen display. By installing a counter circuit that counts the lighting rate of the screen, the brightness of the display screen is reduced according to the lighting rate, thereby preventing deterioration and fluctuation of characteristics such as screen burn due to rise in display temperature. It is.

[Industrial application field]

The present invention relates to a display device, and particularly to a display device including a display portion whose characteristics deteriorate when turned on, and more particularly to a display device that adjusts brightness according to the lighting rate of a display screen.

(Prior Art) Among conventional display devices having a brightness adjustment means, for example, there are devices in which display brightness is manually adjusted and uniquely set.

According to this method, the brightness on the display screen is always fixed at a set value, so for example, as the number of lit pixels on the display screen increases, the temperature of the screen surface of the display increases. Ta.

[Problem that the invention seeks to solve]

According to the above-mentioned conventional technology, there is a drawback that characteristic fluctuations and deterioration of the display section occur over time, such as tube surface burning or discharge becoming unstable due to an increase in the tube surface temperature 6 of the display section. Ta.

In view of the above-mentioned problems, the present invention provides a display device that prevents deterioration and characteristic fluctuations of the display section.

13= [F-stage for solving the problem] The display device of the present invention includes a display unit that displays a screen, and a brightness adjustment circuit that controls the brightness of the display screen of the display unit, The display device includes a counter circuit that sends a signal to the brightness adjustment circuit according to the display state of the display section, and controls the brightness of the display screen of the display section according to the display state of the display section.

[Effect]

According to the present invention, by providing a counter circuit for detecting the lighting rate of display pixels in a display device,
It operates to reduce the brightness according to the number of lit pixels on the display screen.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail with reference to FIG.

In the display device shown in FIG. 1, the display unit l is a plasma display panel, and by applying a voltage to the X-direction electrode and the Y-direction electrode, the pixel at the point where both electrodes intersect is turned on. It is.

The interface circuit 4 is composed of a terminating resistor of a connected transmission line and an input voltage protection resistor of a receiving element, and is used to transfer data signals and control signals given from the outside. The data signal and control signal input through 4 are separated into an X electrode scanning signal and a Y electrode scanning signal of the display section 1, and are sent to the X electrode scanning circuit 6 and the Y electrode scanning circuit 7 without adjusting the scanning timing. This is what is sent to.

The X electrode scanning circuit 6 and the Y electrode scanning circuit 7 are connected to the display section 1.
The electrodes printed on the pixel are driven, a lighting signal is received, and a voltage is applied to light a pixel at a point where the electrodes in the X direction and the electrode in the Y direction intersect.

The counter circuit 3 provides a lighting signal for one screen of the display section 1;
That is, it counts the number of lit pixels on one display screen, detects the number of lit pixels that is greater than a predetermined set value, and sends a signal to the brightness adjustment circuit 2 to reduce the brightness of the display screen.

The brightness adjustment circuit 2 controls the timing control circuit 5 in response to the brightness reduction signal output from the counter circuit 3, and reduces the voltage application time to the electrodes when each pixel of the display section 1 is turned on. This reduces the brightness of the screen.

Here, the display pixels of the display section 1 shown in FIG. 1 are set to 64, for example.
Assuming that it is composed of pixels of 0 dots x 400 dots, and that the display brightness is reduced when 70% or more of all pixels, that is, 256,000 pixels, are lit,
When the counter circuit 3 counts 179,200 lighting signals, it sends a brightness reduction signal to the brightness adjustment circuit 2.

As a result, the brightness of the display screen of the display unit 1 is reduced.

In this way, the present invention focuses on the number of lighting pixels in the display section, uses a counter to count whether the lighting rate of the display screen exceeds a predetermined value, and reduces the brightness. It has the following characteristics.

Although this embodiment shows an example in which a plasma display panel is used as the display section, other display devices such as C
It is also possible to use RT.

In addition, regarding the method of reducing display brightness, in addition to reducing the display brightness when a predetermined number of pixels are reached, there are also methods for reducing display brightness.
A similar method can be used in which the display brightness is gradually reduced as the number of illuminated pixels increases.

〔Effect of the invention〕

As described in detail above, the display device of the present invention includes a counter circuit that counts the number of lit pixels of the display section, and reduces the display brightness of the display section when a predetermined number of lit pixels is reached. This prevents the temperature of the display tube from increasing due to an increase in the lighting area, and prevents changes and deterioration in characteristics such as burning of the display tube surface or unstable discharge due to an increase in the display tube temperature. With the effect,
Furthermore, it has the effect of reducing the rise in temperature within the housing of the display device.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the display device of the present invention. In the drawings, 1 is a display section, 2 is a brightness adjustment circuit, 3 is a counter circuit, 4 is an interface circuit, 5 is a timing control circuit, 6 is an X electrode scanning circuit, 7 is a Y electrode The scanning circuits are shown respectively.

Claims (4)

[Claims] (1) A display unit (1) that performs screen display, and the display unit (1)
A display device comprising a brightness adjustment circuit (2) that controls the brightness of a display screen of a counter circuit (3) that sends a signal to the brightness adjustment circuit (2) according to the display state of the display section (1). ), wherein the brightness of the display screen of the display section (1) is controlled according to the display state of the display section (1). (2) The display unit (1) is composed of a plurality of display pixels, and the plurality of display pixels turn on and/or turn off to display the screen. Display device as described in Section 1. (3) The counter circuit (3) is connected to the display section (1).
Claims characterized in that the number of lit pixels on the display screen of the display unit (1) is counted, a predetermined number of lit pixels is detected, and a signal is sent to reduce the display brightness of the display unit (1). The display device according to items 1 and 2. (4) The display device according to any one of claims 1 to 3, wherein the display section is a plasma display panel.