Image displaying method for image display device

Description: TECHNICAL FIELD [Detailed description of the invention]

【0001】

[Technical field to which the invention belongs]

The present invention relates to an image display method in an image display device, and more particularly to an image display method in an image display device using an organic EL panel.

【0002】

[Conventional technology]

Conventionally, a liquid crystal display device is generally used as a flat image display device for dot matrix display, but the liquid crystal display device has poor contrast and requires a backlight, so that the module is thick. There are poor visibility and structural restrictions.

【0003】

On the other hand, an organic EL (electroluminescence) display device, which has been attracting attention in recent years, is an image display device in which a plurality of self-luminous elements are arranged in a dot matrix, and is a thin module having high contrast and excellent visibility. Therefore, it has the advantage of being easy to mount on products.

【0004】

[Problems to be Solved by the Invention]

However, in the dot matrix organic EL display device, each dot is a light emitting element, and each dot has a life. Therefore, if the same element is made to emit light for a long time, the brightness life of the light emitting element varies, and when the display screen is switched or characters are scrolled, the variation due to the brightness life of the light emitting element becomes uneven and visually. A so-called burn-in phenomenon occurs in which light emission cannot be displayed with uniform brightness. As a result, there is a problem that the display quality of the organic EL display device deteriorates. Therefore, an object of the present invention is to provide an image display method capable of suppressing uneven light emission due to variations in the brightness life of the light emitting element, extending the brightness life of the light emitting element, and displaying a high-quality image.

【0005】

[Means for solving problems]

According to the present invention, in the image display method in an image display device, the above problem is solved by displaying negatives / positives of images that are continuously and fixedly displayed at a predetermined position in a predetermined cycle. To. Further, according to the present invention, the above problem is solved by displaying images that are continuously and fixedly displayed at a predetermined position by shifting the display position at a predetermined cycle. By switching the negative / positive or display position of the display image at a predetermined cycle, the light emitting element that lights continuously for a long time disappears, and the luminance life of the light emitting element can be extended. Further, since the light emission unevenness due to the variation in the brightness life of the light emitting element is reduced, it is possible to provide a high-quality image display.

【0006】

BEST MODE FOR CARRYING OUT THE INVENTION

(a) Outline of the present invention FIG. 1A is a first schematic explanatory view for explaining the image display method of the present invention, and is a view showing negative / positive reverse display in an image display device. If there is an image that lights up for a long time (for example, the character "FM"), the negative display A and the positive display B are switched and displayed at a predetermined cycle. By doing so, there is no light emitting element that lights continuously for a long time, and the brightness life of the light emitting element can be extended.

【0007】

FIG. 1B is a second schematic explanatory view of the present invention, which is a view in which the display position on the image display device is shifted. If there is an image that lights up for a long time (for example, "FM" character), the display at the regular display position C and the display at the display position D shifted by several dots from the regular display position are switched at a predetermined cycle. By doing so, there is no light emitting element that lights continuously for a long time, and the brightness life of the light emitting element can be extended.

【0008】

(b) Configuration of organic EL display device FIG. 2 is a block diagram showing a configuration of an organic EL display device to which the present invention can be applied. Reference numeral 1 denotes a panel display control unit, which is composed of a CPU / RAM / ROM / time counter (not shown) and the like, and performs image display processing according to a processing flow described later. 2 is a display controller that generates a predetermined dot image image based on an image display command sent from the panel display control unit 1, and 3 is a RAM that stores dot image image data. 4 is a scanning driver that drives a scanning line, and 5 is a data driver that outputs a signal based on image data. 6 is an organic EL panel in which a plurality of light emitting elements are arranged in a dot matrix, and 7 is a controller that controls the scanning side driver 4 and the data side driver 5 based on the image data stored in the RAM 3.

【0009】

(c) First image display method of the present invention FIG. 3 is a display example by the first image display method of the present invention, and is an image display example in a car audio display to which negative / positive reverse display processing is applied. 11 is a fixed display area on the display, an area where characters, numbers, etc. indicating the selected audio source, various functions, bands, etc. are continuously fixedly displayed for a predetermined time or longer, and 12 is a variable display area where the spectrum analyzer, etc. on the display is displayed. Is. Further, FIG. 4 is a diagram showing a processing flow of the first image display method of the present invention.

【0010】

Assuming that the initial setting screen of the car audio display is a negative display, the display controller 2 generates a negative image in response to a command from the panel display control unit 1 when FM is selected, and as shown in FIG. 3 (a), the display (organic) Display the negative image on the EL panel 6) (step 101). That is, the source name display such as FM indicating the selected source and the function name indicating various other functions (for example, loudness: LOUD) are negatively displayed in the fixed display area 11, and the spectrum analyzer is displayed in the variable display area 12. Next, the panel display control unit 1 performs a process of counting the negative display time T by the built-in time counter, and determines whether or not the negative display time T has reached the set time N (step). 102). If it has not been reached, the negative display process is performed until the negative display time T reaches the set time N. If it has reached, the panel display control unit 1 outputs a display command for performing positive display. By this positive display command, the display controller 2 inverts the display logic of the image data to be displayed, generates the positive image data of the dot image, and stores it in the RAM 3. After that, as shown in FIG. 3 (b), a positive image is displayed in the fixed display area 11 of the display (organic EL panel 6) via the RAM 3, the controller 7, the scanning driver 4, and the data driver 5 (step). 103). Next, the panel display control unit 1 performs a process of counting the positive display time T by the built-in time counter, and determines whether or not the positive display time T has reached the set time N (step 104). .. If it has not been reached, the positive display process is performed until the positive display time T reaches the set time N. If it has been reached, the process proceeds to the negative display process (step 101), and the above negative / positive reverse display process is repeated. By doing so, the light emitting element that lights continuously for a long time disappears (the lighting time can be halved), and the brightness life of the light emitting element can be extended.

【0011】

(d) Second image display method of the present invention FIG. 5 is a diagram showing a processing flow of the second image display method of the present invention. When the character "FM" is displayed on the organic EL panel 6 when FM is selected, the display controller 2 generates the character image of "FM" by the command of the panel control unit 1, and is shown by C in FIG. 1 (b). As shown, the "FM" character is displayed at the regular position of the organic EL panel 6. (Step 201). Next, the panel display control unit 1 performs a process of counting the display time T at the normal position of the character "FM" by the built-in time counter, and determines whether or not the normal position display time T has reached the set time N. Determine (step 202). If it has not been reached, the normal position display process is performed as it is until the normal position display time T reaches the set time N. If it has been reached, the panel display control unit 1 outputs a display command for shifting display. By this shift display command, the display control 2 generates a character image of "FM" at a position deviated by a predetermined amount from the normal display position, for example, a position shifted by 2 dots in the right and downward directions, and stores the character image in the RAM 3. After that, as shown in D in Fig. 1 (b), the "FM" character is displayed on the organic EL panel 6 at a position deviated from the regular display position via RAM3, controller 7, scanning side driver 4, and data side driver 5. (Step 203). Then, the display time T of the "FM" character displayed at the shifted position of the panel display control unit 1 is counted by the built-in time count, and it is determined whether or not the shifted display time T has reached the set time N (step 204). ). If it has not been reached, the shift display process is performed until the shift display time T reaches the set time N. If it has reached, the process proceeds to the normal position display process (step 201), the "FM" character is displayed at the normal position, and the above display process is repeated thereafter. By doing so, the light emitting element that lights continuously for a long time disappears, and the brightness life of the light emitting element can be extended.

【0012】

In the above, the negative / positive reverse display control and the display position switching control are performed separately, but these controls can be combined and performed. Further, in the above, the case where the shift display position is one, but the lighting time of each issuing element can be further reduced by sequentially displaying the shift display positions in two or more shift positions. Further, although the case where it is applied to the organic EL display device has been described above, it can be easily applied to other image display devices composed of a dot matrix.

【0013】

[Effect of the invention]

As described above, according to the present invention, by displaying the negative / positive of the image that is continuously and fixedly displayed at a predetermined position by inverting it at a predetermined cycle, there is no light emitting element that lights continuously for a long time, and light is emitted. The brightness life of the device can be extended. As a result, uneven light emission due to the burn-in phenomenon is reduced, so that a high-quality display device can be provided.

【0014】

Further, by shifting the display position of the image continuously and fixedly displayed at a predetermined position at a predetermined cycle, the light emitting element that is continuously lit for a long time disappears, and the brightness life of the light emitting element is extended. Since the effect of being able to do so is obtained and uneven light emission due to the burn-in phenomenon is reduced, it is possible to provide a high-quality display device.

[Simple explanation of drawings]

[Figure 1]

It is the schematic explanatory drawing of the image display method of this invention.

[Figure 2]

It is a block diagram which shows the structure of an organic EL display device.

[Fig. 3]

This is an image display example of the present invention in a car audio display.

[Fig. 4]

It is a flow chart of the 1st image display processing of this invention.

[Fig. 5]

It is a flow chart of the 2nd image display processing of this invention.

[Explanation of symbols]

A ... Negative display B ... Positive display C ... Regular display position D ... Shift display position