GIP Controller PWM for OLED Bezel Reduction
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Solution Overview
Problem
High resolution displays face challenges in signal control due to size limitations, making it difficult to provide suitable signals for each line, and existing PWM implementations often consume more circuit board space than desired.
Innovation Solution
A gate-in-panel (GIP) controller system that uses programmable clock inputs and shift registers to perform pulse-width modulation (PWM) of emission signals, optimizing signal routing and reducing bezel size by coordinating clock signals and scanning signals through inverters to adjust pulse widths for dimming effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If PWM is implemented using conventional circuitry, then pulse-width modulation capability is achieved, but circuit board space consumption increases
Solution Approach 1:
The patent merges the PWM generation function with the existing gate-in-panel controller by utilizing the shift register and inverter that are already present in the display controller architecture. The programmable clock input is integrated into the existing controller structure, allowing PWM to be generated without adding separate dedicated PWM circuitry, thus achieving space efficiency while maintaining PWM capability.
Solution Approach 2:
The shift register and inverter components are made multi-functional by enabling them to perform both their original scanning signal generation functions and the additional PWM modulation function. The programmable clock input allows the same hardware components to serve multiple purposes: line scanning, data transmission, and PWM emission control, thereby eliminating the need for separate dedicated PWM circuits.
2Measurement precision
If more signals are provided for each line in high resolution displays, then display control precision is improved, but device complexity increases
Solution Approach 1:
The patent introduces dynamic control of the emission signal through programmable clock inputs that can be adjusted in real-time. The pulse width of the emission signal is dynamically modified based on the scanned line number and the programmable clock timing, allowing precise control of display characteristics without requiring additional static signal lines. This dynamic adjustment capability provides precision while maintaining signal control simplicity.
Solution Approach 2:
The patent achieves precise display control by changing the timing parameters of existing signals rather than adding more signals. The programmable clock input allows adjustment of the emission signal's pulse width and timing characteristics for each line, enabling precise control of display properties such as brightness and refresh timing through parameter modification rather than increased signal complexity.
Data Source
AI summary
This application sets forth a circuit configuration for a light emitting diode (LED) or organic light emitting diode (OLED) display. The circuit configuration allows for the pulse-width modulation (PWM) of each emission signal sent to each line of the display. The PWM of each emission signal is accomplished using a gate-in-panel (GIP) controller of the display. The GIP controller uses an arrangement of shift register outputs and a programmable clock input to control an output of an inverter that provides the emission signal. The programmable clock input can be programmed according to a desired timing or duty cycle for the emission signal. In this way, by limiting the duty cycle of the emission signal, dimming and other display features can be exhibited by the LED or OLED display.