Sub-Frame Pixel Circuit Layout for Larger Display Idle Area
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Solution Overview
Problem
Existing technologies fail to provide a display device capable of securing a large idle area, which is essential for high-resolution image display and efficient heat dissipation.
Innovation Solution
The display device incorporates a pixel structure with multiple transistors and capacitors, including a switching transistor, driving transistor, emission control transistors, and light emitting elements, optimized for sub-frame periods, and a data driver that applies reference and data voltages to secure a large idle area for the display device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a conventional pixel structure is used, then the device complexity is reduced, but the idle area cannot be sufficiently secured for high-resolution display and heat dissipation
Solution Approach 1:
The frame period is divided into multiple sub-frame periods, with each sub-frame dedicated to different pixels (e.g., first sub-frame for first pixels, second sub-frame for second pixels). This temporal segmentation allows the data line to be reused across multiple pixel groups, reducing the total number of data lines required and thereby increasing the idle area available for high-resolution display and heat dissipation.
Solution Approach 2:
The data line serves multiple functions: it provides data voltages to different pixel groups during different sub-frames and also provides reference voltages for initializing the gate electrode of the driving transistor. This multi-functionality reduces the need for separate dedicated lines, thereby increasing the idle area.
2Manufacturing precision
If multiple data lines are provided for each pixel, then the manufacturing precision and resolution are improved, but the idle area is reduced
Solution Approach 1:
The display is divided into multiple pixel groups that are activated in different sub-frames. By segmenting the pixel activation in time, the patent reduces the number of simultaneous data lines needed, thereby increasing idle area while maintaining high resolution through the use of multiple emission control transistors and capacitors for precise voltage control.
Solution Approach 2:
The patent adds a temporal dimension to the display refresh process by using sub-frame periods. Instead of updating all pixels simultaneously in a single frame, pixels are updated across multiple sub-frames, effectively trading spatial resources (data lines) for temporal resources (time slots), thereby increasing idle area while maintaining resolution.
3Reliability
If the gate electrode is initialized frequently, then the reliability is improved, but the loss of time increases
Solution Approach 1:
The gate electrode initialization is performed periodically at the beginning of each sub-frame period using reference voltages provided during idle periods. This periodic initialization ensures the driving transistor maintains proper operating conditions for reliability while utilizing otherwise wasted time slots, thereby minimizing the impact on overall display performance.
Solution Approach 2:
The gate electrode is initialized in advance at the beginning of each sub-frame period before the actual pixel activation occurs. This preliminary action ensures the driving transistor is properly prepared for the upcoming frame data voltage application, improving reliability without interfering with the main display operation.
4Productivity
If a compact pixel structure is used, then the productivity is improved, but the heat dissipation capability is reduced
Solution Approach 1:
By segmenting the pixel activation into different sub-frames and using idle periods for initialization, the patent creates temporal spacing in the operation cycle. This allows heat generated during active periods to dissipate during idle periods, improving heat management while maintaining compact manufacturing-efficient pixel structures.
Solution Approach 2:
The periodic switching between active display periods and idle initialization periods creates thermal cycles that allow heat dissipation. During idle periods when no pixel data is being updated, the reduced activity allows generated heat to dissipate, preventing thermal accumulation in compact high-productivity display structures.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration allows for high-resolution image display with efficient heat dissipation, enabling the integration of driving parts within the display device, thus enhancing its performance and manufacturing efficiency.
Implementation Method 1
a first light emitting element connected to the first emission control transistor; a second light emitting element connected to the second emission control transistor. The first light emitting element emits light during a first sub-frame period of a frame period, the second light emitting element emits light during a second sub-frame period of the frame period
Data Source
AI summary
A display device includes a first pixel comprising a switching transistor, a driving transistor, a first emission control transistor, and a first light emitting element; a second pixel comprising a second emission control transistor electrically connected to a contact point between the driving transistor and the first emission control transistor and a second light emitting element; and a data driver transmitting a reference voltage, a first data voltage of the first pixel, and a second data voltage of the second pixel to a data line. The first light emitting element emits light during a first sub-frame period of a frame period, the second light emitting element emits light during a second sub-frame period of the frame period, and a gate electrode of the driving transistor is initialized by the reference voltage from the data line during the first sub-frame period.